The DOI matches its Crossref record; 51 of the 51 references it cites were found in a registry or an index; 27 of the 43 sources its claims cite were checked for support.
Dual endomembrane recycling pathways function in parallel to support synapse maintenance and plasticity
Open accessAbstract
The SNX27-Retromer and more recently discovered SNX17-Retriever complexes are key drivers in recycling internalized cargoes back to the cell surface in eukaryotic cells, but the extent to which these pathways have unique or redundant roles in neurons is not known. Here, we show similar, but non-overlapping, roles of the SNX17-Retriever and SNX27-Retromer pathways in the maintenance and plasticity of excitatory synapses. We find that in vivo disruption of either pathway in developing rats leads to a marked loss of excitatory synapses in CA1 pyramidal neurons, a phenotype that is recapitulated in cultured hippocampal neurons. Further analysis in cultured neurons confirms that SNX17 and SNX27 colocalize prominently with each other and Retriever/Retromer in early endosomes, indicating a largely shared cellular localization of the two pathways. Interestingly, coordinate disruption of both pathways produced an additive loss of excitatory synapses, suggesting parallel roles in synapse maintenance. We further show that certain cargoes are specific for each pathway and that both recycling pathways are essential for numerous forms of synaptic plasticity, including long-term potentiation (LTP), long-term depression (LTD), and homeostatic synaptic scaling. Together, our results support a model where the SNX17-Retriever and SNX27-Retromer pathways function largely in parallel at synapses, with their combinatorial action a key requirement for long-lasting forms of synaptic plasticity.
Overview
AI snapshot
Written from the paper’s full text.
TL;DR
The SNX17-Retriever and SNX27-Retromer endomembrane recycling pathways act largely in parallel to maintain excitatory synapses and support multiple forms of synaptic plasticity in hippocampal neurons. Disrupting either pathway causes synapse loss, and combined disruption produces additive deficits, while specific cargoes such as AMPARs are recycled by only one pathway.
Key findings
- In vivo AAV9 shRNA knockdown in P8–10 rat CA1 pyramidal neurons reduced dendritic spine density by 40% for SNX17 and 58% for SNX27 versus scrambled control; both also reduced the proportion of mature mushroom spines without changing soma area.
- In cultured hippocampal neurons, SNX17 or SNX27 knockdown each caused ~50% loss of dendritic spine density and ~50% reduction in mEPSC frequency, with no significant change in mEPSC amplitude; RNAi-resistant SNX17 or SNX27 rescued only its matched knockdown.
- SNX17 and SNX27 colocalized prominently (~70–80% of puncta, ~80% in dendritic shafts and spines) and both localized strongly with EEA1-positive early endosomes; combined SNX17/SNX27 knockdown produced additive spine loss and additive reduction in mEPSC frequency, and SNX17 plus VPS26B (Retromer), but not VPS26C (Retriever), also produced additive spine loss.
- Both pathways were required for cLTP, cLTD, and TTX-induced homeostatic upscaling; AMPAR recycling was virtually abolished by SNX27 knockdown but unaffected by SNX17 knockdown, and function-blocking β1-integrin prevented both cLTD and cLTP.
Methods
- Sprague Dawley rats: P0–1 pups for primary hippocampal/cortical neuron cultures; P8–10 pups received unilateral stereotaxic AAV9 shRNA infusion into CA1, with contralateral scrambled shRNA control, and brains were analyzed 14 days later by confocal microscopy for dendritic spine density and morphology.
- Cultured hippocampal neurons were used for shRNA/lentiviral knockdown, plasmid transfection, CRISPR-ORANGE tagging of endogenous SNX27, immunocytochemistry, Western blot, and live AMPAR recycling assays; synaptic function was assessed by whole-cell voltage-clamp mEPSC recordings after chemical LTP, chemical LTD, or 24-hr TTX-induced homeostatic scaling.
- Statistical comparisons used unpaired Student’s t-test or one-way ANOVA with Fisher’s LSD post hoc tests; experiments were repeated at least three times, and data distribution was assumed normal but not formally tested.
Limitations
- The paper states that additivity of synapse loss was examined under knockdown rather than null conditions, though it argues that additive effects with VPS26B but not VPS26C support parallel pathways.
- The paper states that data distribution was assumed normal but not formally tested.
- The paper states that it does not clearly answer whether the pathways play instructive or permissive roles in homeostatic scaling, and notes that acute versus persistent depletion may account for differences from prior SNX17 studies.
Model-written summary. Check it against the paper before relying on it.
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Claims the paper makes
27 of 43 cited sources checked · 9 supported · 1 flagged · accuracy not yet measured
- Findingcitation
Blocking β1-integrin disrupts cLTP induction.
“we confirmed that blocking β1-integrin similarly disrupts cLTP induction (Rivero Rios et al., 2023).”
Quote in the paperSubstantial claim1 of 1 sources checked- cites Rivero Rios et al., 2023 source
The Results section (“Blocking β1-integrin function mimics most effects of SNX17 knockdown on synaptic function,” Fig. 9) says β1-integrin blocking did not alter the initial cLTP-dependent enhancement during the first 30 minutes. It disrupted maintenance after 30 minutes, whereas SNX17 knockdown blocked initiation. The source therefore contradicts the claim about cLTP induction. (LLM, conf=0.94)
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measured
- Rests on an assumption: The function-blocking β1 integrin antibody specifically blocks β1 integrin function without other effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Knockdown of SNX17 blocks cLTP induction in cultured rat hippocampal neurons.
“we found that knockdown of SNX17 blocked this cLTP induction (Figure 5B, D).”
- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · plain
“Likewise, we found that knocking down SNX17 or blocking the SNX17-specific cargo β1-integrin both prevented the establishment of cLTP, as reported previously (Rivero Rios et al., 2023).”
Quote in the paperSubstantial claim1 of 1 sources checked- cites Rivero Rios et al., 2023 source
- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · plain
- Findingown data
In vivo SNX17 knockdown in developing rat CA1 reduces synapse density 2 weeks post-surgery.
“Similar to Rivero Rios et al. (2023), we observed a marked reduction in synapse density in CA1 pyramidal neurons 2 weeks post-surgery (P22–24).”
Quote in the paperSubstantial claim1 of 1 sources checked- cites Rivero Rios et al., 2023 source
The Results (Figure 2; page unavailable) report reduced dendritic spine density after SNX17 knockdown in cultured rat hippocampal neurons. The paper does not establish the attributed in vivo finding in developing rat CA1 neurons two weeks after surgery; its cultured neurons were assessed four days after transfection. (LLM, conf=0.90)
Experimental — accuracy not yet measured
- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Findingcitation
Both SNX17 and SNX27 are predominantly localized to endosomes.
“Moreover, both SNX17 and SNX27 are predominantly localized to endosomes, which is consistent with previous studies examining SNX27 distribution in neurons (Loo et al., 2014; Hussain et al., 2014).”
Quote in the paperSubstantial claim2 of 2 sources checked- cites Loo et al., 2014 source
- cites Hussain et al., 2014 source
The citation is attached specifically to the statement about SNX27 distribution in neurons, not the finding about SNX17. The Results report that SNX27 partially colocalizes with an endosomal marker, but is also concentrated at synapses; they do not establish that it is predominantly localized to endosomes. (LLM, conf=0.86)
Experimental — accuracy not yet measured
- Findingown data
Knockdown of SNX27 blocks cLTP induction in cultured rat hippocampal neurons.
“Similarly, knockdown of SNX27 also blocked cLTP (Figure 5E–G), again similar to earlier reports (Loo et al., 2014; Hussain et al., 2014; see also, Temkin et al., 2017).”
- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · plain
“Consistent with several prior studies (Wang et al., 2013; Loo et al.,2014; see also, Temkin et al., 2017), we found that depleting neurons of SNX27 prevented the induction of cLTP.”
Quote in the paperSubstantial claim2 of 3 sources checked- cites Loo et al., 2014 source
In Results (“SNX27 important for AMPA receptor delivery and LTP”; page unavailable), glycine stimulation barely increased the GluA1 insertion signal in cultured neurons lacking SNX27. The paper used neurons from SNX27-knockout mice, not SNX27 knockdown in rat neurons; its direct measurement of abolished LTP was in mouse hippocampal slices, not the cultured neurons. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites Hussain et al., 2014 source
The Results report that SNX27 knockdown completely blocked the cLTP-induced increase in surface GluA1 in neurons. They do not establish that knockdown blocked cLTP induction itself; the Discussion describes an effect on AMPAR surface recruitment and treats an effect on potentiation as a possibility. (LLM, conf=0.87)
Experimental — accuracy not yet measured - cites Temkin et al., 2017 source
- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · plain
- Premisecitation
SNX27-dependent recycling of AMPARs via Retromer adds new receptors to synapses during LTP, an instructive role.
“As noted above, SNX27-dependent recycling of AMPARs via Retromer has been shown to add new receptors to synapses during LTP (Wang et al., 2013; Loo et al.,2014; Hussain et al., 2014; Temkin et al., 2017), a clear instructive role.”
Quote in the paperSubstantial claim3 of 3 sources checked- cites Wang et al., 2013 source
The Results report that SNX27 promotes AMPAR recycling to the cell surface and that LTP is reduced in Snx27+/− mice. But the Discussion says whether AMPAR recycling depends on retromer remains to be investigated, and the paper does not show recycled receptors being added to synapses during LTP. It therefore does not establish the claimed instructive mechanism. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites Loo et al., 2014 source
The Discussion (page unavailable) reports that SNX27 is required for GluA1 delivery during synaptic potentiation and for LTP, supporting the claim that it helps add AMPARs to synapses. The paper describes recycling endosomes and a CaM/K-ras–SNX27 mechanism, but does not establish that this delivery occurs via Retromer. Its description of SNX27 as relaying plasticity stimuli supports the proposed instructive role. (LLM, conf=0.86)
Experimental — accuracy not yet measured - cites Hussain et al., 2014 source
The Results report that SNX27 depletion blocked the increase in surface AMPARs during chemical LTP, and the Discussion describes SNX27 as an AMPAR recycling adaptor. But the study measures recruitment to the neuronal surface rather than directly showing new receptors added to synapses, and our copy does not establish that this LTP-dependent recruitment occurs via Retromer. The paper uses a chemical protocol mimicking LTP. (LLM, conf=0.86)
Experimental — accuracy not yet measured
- Premisecitation
SNX27 Retromer-dependent AMPAR recycling is essential for synaptic potentiation and plasticity.
“SNX27 Retromer-dependent AMPAR recycling is essential for synaptic potentiation and plasticity”
Quote in the paperSubstantial claim3 of 3 sources checked- cites Loo et al., 2014 source
The Results and Discussion report that loss of SNX27 impairs GluA1 delivery during LTP and abolishes synaptic potentiation in brain slices. The paper mentions retromer cargoes, but does not establish that the AMPAR trafficking required for potentiation is retromer-dependent. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites Hussain et al., 2014 source
The Discussion identifies SNX27 as an AMPAR recycling adaptor, and the Results show that SNX27 depletion blocks AMPAR surface recruitment during chemical LTP. The paper does not establish that this recycling is retromer-dependent or directly show that SNX27 is essential for synaptic potentiation itself; the Discussion presents that latter role as a possibility. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites McMillan et al., 2021 source
The Introduction says SNX27 is required to maintain AMPA-receptor-mediated currents during synaptic plasticity. The Results report that LRFN2 suppression attenuated hippocampal long-term potentiation, and the Discussion proposes a role for LRFN2 in SNX27-dependent AMPA receptor recycling. The paper does not establish that retromer-dependent recycling itself is essential for potentiation and plasticity; that wording goes beyond the reported experiments. (LLM, conf=0.84)
Experimental — accuracy not yet measured
- Premisecitation
Both SNX17-Retriever and SNX27-Retromer pathways are crucial for maintaining excitatory synapse function.
“Despite their independent cargo profiles and molecular machinery, both SNX17-Retriever and SNX27-Retromer pathways are crucial for maintaining excitatory synapse function”
Quote in the paperSubstantial claim3 of 3 sources checked- cites Rivero Rios et al., 2023 source
- cites Asadzadeh et al., 2022 source
The Introduction (page unavailable) reports that reducing retromer activity can inhibit long-term potentiation at hippocampal synapses, supporting a general link between retromer and synaptic function. Neither that passage nor the searched passages address SNX17-Retriever or SNX27-Retromer specifically, their independent cargo profiles, or whether both pathways are crucial for excitatory synapse function. (LLM, conf=0.82)
Experimental — accuracy not yet measured - cites Phadke et al., 2025 source
The Results section ('SNX27 interacts with C4 and is essential for normal dendritic spine formation of L2/3 PFC neurons'; page not provided) links SNX27 to AMPA-receptor recycling and reports reduced spine density after Snx27 knockdown. The Discussion links this process to the SNX27–retromer complex. Our copy does not establish a role for SNX17–Retriever in excitatory synapse function or compare the two pathways’ cargo profiles and machinery. (LLM, conf=0.88)
Experimental — accuracy not yet measured
- Premisecitation
Endocytic recycling is a key mechanism by which neurons control the composition of surface receptors, adhesion molecules, and transporters in response to synaptic activity.
“Endocytic recycling, in which internalized surface proteins are routed back to the plasma membrane, is a key mechanism by which neurons control the composition of surface receptors, adhesion molecules, and transporters in response to synaptic activity”
Quote in the paperSubstantial claim2 of 2 sources checked- cites Diering and Huganir, 2018 source
The Introduction sections on LTP and the postsynaptic density slot hypothesis describe AMPA receptors moving from recycling endosomes to the cell surface in an activity-dependent manner, supporting the receptor-trafficking part of the claim. They do not establish that endocytic recycling controls the surface composition of adhesion molecules or transporters. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites van Oostrum et al., 2020 source
The Results sections on surface-abundance profiles and differential regulation identify endosomal recycling as one of several processes that help control neuronal surface proteins and synaptic plasticity. The cLTP Results report activity-related surface changes in receptors, adhesion molecules, and solute carriers. The paper does not establish that endocytic recycling specifically drives those changes or is the key mechanism for them; it also discusses biosynthesis, degradation, and other surface trafficking. (LLM, conf=0.86)
Experimental — accuracy not yet measured
- Premisecitation
A key SNX27 cargo in hippocampal neurons is the AMPA-type glutamate receptor (AMPAR).
“A key SNX27 cargo in hippocampal neurons is the AMPA-type glutamate receptor (AMPAR)”
Quote in the paperSubstantial claim3 of 3 sources checked - Findingown data
The β1 integrin antibody does not alter basal mEPSC amplitude in the absence of cLTD stimulation.
“the β1 integrin antibody did not alter basal mEPSC amplitude in the absence of cLTD stimulation.”
Quote in the paperSubstantial claim- Rests on an assumption: The function-blocking β1 integrin antibody specifically blocks β1 integrin function without other effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Under control conditions, cLTP induction produces robust increases in mEPSC amplitude 20-60 min post-induction relative to mock-treated sister cultures.
“Under control conditions (scr shRNA), we observed robust increases in mEPSC amplitude 20–60 min post-cLTP induction relative to mock-treated sister cultures (Figure 5B–C).”
Quote in the paperSubstantial claim- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Certain cargoes are specific for each pathway.
“certain cargoes are specific for each pathway”
Quote in the paperSubstantial claim - Findingown data
SNX27 knockdown induced a significant ~50% reduction in mEPSC frequency in cultured hippocampal neurons.
“both SNX17 (Figure 2G–I) and SNX27 (Figure 2J–L) knockdown induced a significant ~ 50% reduction in mEPSC frequency”
Quote in the paperSubstantial claim - Findingown data
Coincident knockdown of SNX17 with VPS26B, but not VPS26C, induces additive spine loss.
“However, we also found that coincident knockdown of SNX17 with the Retromer subunit VPS26B, but not the Retriever subunit VPS26C, induced additive spine loss.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Findingown data
Knockdown of SNX17 or the core Retriever subunit VPS26C causes marked loss of excitatory synapses.
“We found a similar marked loss of excitatory synapses when we knocked down SNX17 or the core Retriever subunit VPS26C.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Findingown data
Loss of SNX17 has no effect on the rate of GluA1 recycling over 60 min.
“Loss of SNX17 had no effect on the rate of this GluA1 recycling, but SNX27 knockdown virtually abolished GluA1 recycling over the 60 min period.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: The dual-labeling imaging protocol specifically labels and tracks endogenous AMPARs that are internalized and then recycled back to the surface.
- Findingown data
SNX27 knockdown virtually abolishes GluA1 recycling over 60 min.
“Loss of SNX17 had no effect on the rate of this GluA1 recycling, but SNX27 knockdown virtually abolished GluA1 recycling over the 60 min period.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: The dual-labeling imaging protocol specifically labels and tracks endogenous AMPARs that are internalized and then recycled back to the surface.
- Findingown data
In control neurons, the cLTD protocol produces a significant and sustained decrease in mEPSC amplitude.
“In control neurons (scr shRNA), this protocol led to a significant and sustained decrease in mEPSC amplitude (Figure 8A–C), consistent with other studies (McCartney et al., 2014).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites McCartney et al., 2014 source
Checked before — its earlier verdict is held back until a new check runs.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
SNX27 knockdown produced very similar spine morphology changes in cultured hippocampal neurons.
“SNX27 knockdown produced very similar results in spine morphology”
Quote in the paperSubstantial claim - Findingown data
Coincident knockdown of VPS26B, but not VPS26C, with SNX17 induces an additive loss of dendritic spines.
“We found that coincident knockdown of VPS26B, but not VPS26C, induced an additive loss of dendritic spines (Figure S4).”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Findingown data
cLTD is markedly disrupted following knockdown of SNX17 or SNX27.
“This cLTD was markedly disrupted following knockdown of SNX17 (Figure 8D) or SNX27 (Figure 8E).”
- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · plain
“Again, our results revealed that disrupting either pathway inhibited the induction of cLTD.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · plain
- Findingown data
Soma area was indistinguishable across experimental conditions in CA1 pyramidal neurons after acute SNX17/27 knockdown.
“soma area was indistinguishable across experimental conditions”
Quote in the paperSubstantial claim - Findingown data
SNX27 knockdown prevents homeostatic upscaling of synaptic strength induced by activity silencing.
“we observed a similar pattern of results following SNX27 knockdown – loss of SNX27 prevented homeostatic upscaling of synaptic strength induced by activity silencing (Figure 6E–G).”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Under control conditions, there is a time-dependent increase in surface expression of previously internalized GluA1 in hippocampal neurons.
“Under control conditions (scr), we observed a time-dependent increase in the surface expression of previously internalized GluA1(Figure 7B–E).”
Quote in the paperSubstantial claim- Rests on an assumption: The dual-labeling imaging protocol specifically labels and tracks endogenous AMPARs that are internalized and then recycled back to the surface.
- Findingown data
Combined knockdown of SNX17 and SNX27 causes an additive reduction in mEPSC frequency compared to knockdown of either alone in cultured rat hippocampal neurons.
“we found a decrease in mEPSC frequency in neurons expressing shSNX17 or shSNX27 alone (relative to scr control), but a significant additive reduction of mEPSC frequency with combined SNX17 and SNX27 knockdown (Figure 4C, E).”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Blocking β1 integrin prevents the cLTD-induced decrease in mEPSC amplitude.
“but blocking β1 integrin prevented this synaptic depression (Figure 8I)”
Quote in the paperSubstantial claim- Rests on an assumption: The function-blocking β1 integrin antibody specifically blocks β1 integrin function without other effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Both recombinant and endogenous VPS35 and VPS35L exhibited strong colocalization in neuronal dendrites.
“both recombinant and endogenous VPS35 and VPS35L, core subunits of the Retromer and Retriever complex, exhibited strong colocalization in neuronal dendrites”
Quote in the paperNot a substantial claim - Findingown data
SNX27 knockdown produced a similar spine maturation deficit in CA1 pyramidal neurons.
“a similar spine maturation deficit was observed with SNX27 knockdown assessed in parallel”
Quote in the paperSubstantial claim - Findingown data
mEPSC amplitude was not significantly altered by either SNX17 or SNX27 knockdown.
“mEPSC amplitude, on the other hand, was not significantly altered by either knockdown condition”
Quote in the paperNot a substantial claim - Findingown data
SNX17 and SNX27 knockdown each elicited a significant reduction in overall dendritic spine density in cultured hippocampal neurons compared to scrambled shRNA controls.
“SNX17 and SNX27 knockdown each elicited a significant reduction in overall dendritic spine density when compared to control conditions expressing scr shRNA”
Quote in the paperSubstantial claim - Findingown data
Acute blockade of β1-integrin function disrupts cLTD, suggesting an instructive role for this pathway in LTD.
“Similarly, we found that acute blockade of β1-integrin function disrupted cLTD, suggesting an instructive role for this pathway in LTD as well.”
Quote in the paperSubstantial claim- Rests on an assumption: The function-blocking β1 integrin antibody specifically blocks β1 integrin function without other effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Re-introducing RNAi-resistant SNX17, but not SNX27, rescued spine density to control levels after SNX17 knockdown.
“re-introducing RNAi-resistant SNX17, but not SNX27, indeed rescued spine density back to control levels after SNX17 knockdown”
Quote in the paperSubstantial claim - Findingown data
Expression of RNAi-resistant SNX27, but not SNX17, rescued spine density after SNX27 knockdown.
“expression of RNAi-resistant SNX27, but not SNX17, rescued spine density after SNX27 knockdown”
Quote in the paperSubstantial claim - Findingown data
Endogenous SNX27 tagged with mScarlet showed strong co-localization with SNX17 puncta in hippocampal neurons (~80%).
“Using this approach, we again observed strong co-localization of SNX17 and SNX27 puncta in hippocampal neurons (~80%, Figure 3F–H)”
Quote in the paperSubstantial claim - Findingown data
Both recycling pathways are essential for numerous forms of synaptic plasticity, including LTP, LTD, and homeostatic synaptic scaling.
“both recycling pathways are essential for numerous forms of synaptic plasticity, including long-term potentiation (LTP), long-term depression (LTD), and homeostatic synaptic scaling”
Quote in the paperSubstantial claim - Findingown data
Combined knockdown of both SNX17 and SNX27 led to a significantly larger loss of dendritic spines than either knockdown alone in cultured hippocampal neurons.
“the combined knockdown of both SNX17 and SNX27 led to a significantly larger loss of dendritic spines than either SNX17 or SNX27 knockdown on their own”
Quote in the paperSubstantial claim - Findingown data
The close spatial relationship between SNX17 and SNX27 was evident in both dendritic shafts and dendritic spines (~80%).
“This close spatial relationship between these two sorting nexins was evident in both dendritic shafts and dendritic spines (~80%, Figure 3D–E)”
Quote in the paperSubstantial claim - Findingown data
mEPSC amplitude was not significantly altered by SNX17 or SNX27 knockdown, alone or combined.
“By contrast, mEPSC amplitude was not significantly altered by any treatment conditions (Figure 4D).”
Quote in the paperNot a substantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
Knockdown of VPS26C or VPS26B in cultured hippocampal neurons caused a comparable loss of dendritic spines (~50-60%).
“We also targeted VPS26C and VPS26B, core subunits of Retriever and Retromer respectively, for knock down with shRNA and saw a comparable loss of dendritic spines (~50–60%, Figure S2)”
Quote in the paperSubstantial claim - Findingown data
In vivo SNX17 knockdown decreases the proportion of mushroom spines relative to less mature spine morphologies.
“we found a significant decrease in the proportion of mushroom spines relative to less mature spine morphologies, suggesting a similar spine maturation deficit as they reported.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Findingown data
Depletion of either SNX17 or SNX27 prevents the induction of homeostatic upscaling without altering basal synaptic function.
“Our results show that depletion of either SNX17 or SNX27 prevents the induction of upscaling, without altering basal synaptic function.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
- Findingown data
SNX17 knockdown induced a significant ~50% reduction in mEPSC frequency in cultured hippocampal neurons.
“both SNX17 (Figure 2G–I) and SNX27 (Figure 2J–L) knockdown induced a significant ~ 50% reduction in mEPSC frequency”
Quote in the paperSubstantial claim - Interpretationown data
There were no overt changes in neuronal health associated with acute SNX17/27 knockdown.
“suggesting no overt changes in neuronal health associated with acute SNX17/27 knockdown”
Quote in the paperSubstantial claim - Interpretationreasoning
SNX17-Retriever and SNX27-Retromer are central components of a dual-pathway trafficking system that ensures both the stability and adaptability of excitatory synapses.
“Together, these findings position SNX17-Retriever and SNX27-Retromer as central components of a dual-pathway trafficking system that ensures both the stability and adaptability of excitatory synapses.”
Quote in the paperSubstantial claim - Interpretationown data
Recycling of internalized cargo through both the SNX27-Retromer and SNX17-Retriever pathways is required for adaptive synaptic compensation to network silencing.
“These results, for the first time, suggest that recycling of internalized cargo through both the SNX27-Retromer and SNX17-Retriever pathways is required for adaptive synaptic compensation to network silencing.”
Quote in the paperSubstantial claim - Interpretationown data
Both SNX17-Retriever and SNX27-Retromer recycling pathways have roles in multiple forms of synaptic plasticity characterized by synaptic enhancement.
“Together, these results demonstrate a role for both recycling pathways in multiple forms of synaptic plasticity characterized by synaptic enhancement.”
Quote in the paperSubstantial claim - Interpretationown data
Regulated sorting of the same cargo can have broad roles in distinct forms of plasticity encompassing both strengthening and weakening of synapse function.
“These results demonstrate that regulated sorting of the same cargo can have broad roles in distinct forms of plasticity that encompass both strengthening and weakening of synapse function.”
Quote in the paperSubstantial claim - Interpretationown data
Long-lasting synaptic depression is dependent on both the SNX17-Retriever and SNX27-Retromer endocytic recycling pathways.
“These results demonstrate that, as was the case with enduring forms of synaptic enhancement, long-lasting synaptic depression is also dependent on both endocytic recycling pathways.”
Quote in the paperSubstantial claim - Premisecitation
The SNX27-Retromer pathway is required for proper AMPAR recycling.
“the SNX27-Retromer pathway is known to be required for proper AMPAR recycling (Choy et al., 2014; Hussain et al., 2014; Temkin et al., 2017).”
Quote in the paperSubstantial claim0 of 3 sources checked - Interpretationcitation
The SNX27-Retromer pathway is needed to maintain synapses in vitro and in vivo.
“consistent with our finding that this pathway is needed to maintain synapses in vitro and in vivo.”
Quote in the paperSubstantial claim - Interpretationown data
The SNX17-Retriever and SNX27-Retromer pathways control synapse maintenance in parallel.
“This latter finding argues against the idea that double knockdown induces more complete disruption of a single pathway, and supports the idea that the SNX17-Retriever and SNX27-Retromer pathways control synapse maintenance in parallel.”
Quote in the paperSubstantial claim
- Probably not a substantial claim. 14
- It may state two separate claims as one. 33
- The quote only partly states this claim. 2
Probably not a substantial claim. It may state two separate claims as one.
Premisecitationβ1-integrin is a key SNX17 cargo in hippocampal neurons, and its recycling is required for long-term potentiation of synapse strength.
“Recent work has identified β1-integrin as a key SNX17 cargo in hippocampal neurons, where its recycling is required for long-term potentiation of synapse strength”
Quote in the paperSubstantial claim1 of 1 sources checked- cites Rivero-Ríos et al., 2023 source
The Results section identifies β1-integrin as an SNX17 cargo in neurons and reports that SNX17 knockdown prevents its cLTP-associated increase at the surface of hippocampal neurons. Blocking β1-integrin disrupted maintenance of potentiated synaptic strength, but the paper did not directly test whether β1-integrin recycling itself is required for that maintenance; it also found that SNX17 knockdown and β1-integrin blockade affect different phases of cLTP. (LLM, conf=0.84)
Experimental — accuracy not yet measured
Probably not a substantial claim.
PremisecitationRecycling of internalized membrane proteins back to the cell surface is achieved by at least two distinct pathways, the SNX27-Retromer and SNX17-Retriever pathways.
“In recent years, it has become clear that recycling of internalized membrane proteins back to the cell surface is achieved by at least 2 distinct pathways – the SNX27-Retromer and SNX17-Retriever pathways (McNally et al., 2017; Chen et al., 2019; McDonald, 2020).”
Quote in the paperSubstantial claim1 of 3 sources checkedProbably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationThe SNX27-Retromer pathway mediates the retrieval of over 200 transmembrane proteins in neurons, including neurotransmitter receptors, ion channels, and signaling receptors.
“The better characterized SNX27-Retromer pathway mediates the retrieval of over 200 transmembrane proteins in neurons, including neurotransmitter receptors, ion channels, and signaling receptors”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites McMillan et al., 2021 source
The Introduction describes SNX27–retromer-dependent retrieval of internalised integral proteins, and the paper discusses neuronal receptors and ion channels. But the Results section on the neuronal SNX27 interactome identifies 212 SNX27-interacting proteins—not over 200 transmembrane proteins shown to be retrieved. It identifies seven integral proteins within the specified motif-bearing subset. (LLM, conf=0.89)
Experimental — accuracy not yet measured
It may state two separate claims as one.
PremisecitationLTP stimulation recruits SNX17 to synaptic sites, and SNX17-dependent recycling of β1-integrin via Retriever is necessary for LTP.
“A similar instructive role for SNX17-Retriever can be inferred: LTP stimulation recruits SNX17 to synaptic sites, and SNX17-dependent recycling of β1-integrin via Retriever is necessary for LTP (Rivero-Rios et al., 2023).”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites Rivero-Rios et al., 2023 source
The Discussion reports that cLTP recruits SNX17 and Retriever to synaptic sites. The Results show that SNX17 controls activity-dependent surface β1-integrin levels, but β1-integrin blockade disrupts maintenance—not initiation—of cLTP; the authors say other SNX17 cargoes may be required for initiation. Thus, saying β1-integrin recycling is necessary for LTP without that distinction overstates its demonstrated role. (LLM, conf=0.88)
Experimental — accuracy not yet measured
Probably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationIn non-neuronal cells, SNX17 regulates the surface levels of numerous adhesion molecules and transporters.
“In non-neuronal cells, SNX17 regulates the surface levels of numerous adhesion molecules and transporters”
Quote in the paperNot a substantial claim1 of 2 sources checkedProbably not a substantial claim. It may state two separate claims as one.
PremisecitationDisruptions in protein recycling impair synaptic plasticity and have been linked to neurodevelopmental and neurodegenerative disorders.
“Disruptions in protein recycling impair synaptic plasticity and have been linked to neurodevelopmental and neurodegenerative disorders”
Quote in the paperSubstantial claim1 of 3 sources checkedIt may state two separate claims as one.
Findingown dataAMPAR recycling after SNX17 knockdown is virtually indistinguishable from controls but is almost entirely abolished following SNX27 knockdown.
“Our results show that AMPAR recycling after SNX17 knockdown is virtually indistinguishable from controls but is almost entirely abolished following SNX27 knockdown.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: The dual-labeling imaging protocol specifically labels and tracks endogenous AMPARs that are internalized and then recycled back to the surface.
It may state two separate claims as one.
Findingown dataSNX17 knockdown impaired maturation of dendritic spines in CA1 pyramidal neurons, reducing the proportion of mature mushroom-like spines relative to controls.
“we found that SNX17 knockdown impaired the maturation of dendritic spines, as these cells exhibited a significantly reduced proportion of dendritic spines that were mature mushroom-like relative to scr shRNA-expressing neurons”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataIn control neurons, TTX treatment (1 μM, 24 hrs) produces a significant increase in mEPSC amplitude and a rightward shift in the cumulative mEPSC amplitude distribution.
“In neurons expressing scr shRNA, we found a significant increase in mEPSC amplitude (Figure 6A–C), as well as a clear rightward shift of the cumulative mEPSC amplitude distribution (Figure 6D), a signature of homeostatic scaling.”
Quote in the paperSubstantial claim- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
It may state two separate claims as one.
Findingown datamScarlet-SNX27 exhibited strong co-localization with early endosomes and weaker association with lysosomes.
“A highly similar distribution pattern was observed with mScarlett-SNX27, EEA1, and LAMP1, with SNX27 exhibiting strong co-localization with early endosomes and weaker association with lysosomes”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataSNX17 and SNX27 knockdown each cause prominent loss of synapses, and combined knockdown has an additive effect.
“Despite the fact that SNX17 and SNX27 knockdown each resulted in a prominent loss of synapses on their own, there was an additive effect when both were knocked down together.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
It may state two separate claims as one.
Findingown dataThe extent of synapse loss was comparable between in vivo (~40-60%) and in vitro (~50%) experiments, and between SNX17 and SNX27 knockdown conditions.
“the extent of synapse loss was also comparable between in vivo (~ 40–60 %) and in vitro (~50%) experiments, and between SNX17 and SNX27 knockdown conditions in both experiments”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataSNX17 and SNX27 exhibited robust co-localization in cultured hippocampal neurons, with ~70-80% of SNX17 puncta colocalizing with SNX27 puncta, and vice versa.
“Both SNX17 and SNX27 exhibited a punctate pattern of distribution (Figure 3A) and displayed robust co-localization, with ~70–80% of SNX17 puncta colocalizing with SNX27 puncta, and vice versa”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataSNX17 knockdown in cultured hippocampal neurons significantly diminished the percentage of mushroom spines and increased immature stubby and thin spines.
“the percentage of mushroom spines, typically associated with mature synaptic connections, was significantly diminished following SNX17 knockdown, with a corresponding increase in immature morphologies such as stubby and thin spines”
Quote in the paperSubstantial claimThe quote only partly states this claim.
Findingown dataAcute SNX27 knockdown in CA1 pyramidal neurons of P8-10 rats reduced dendritic spine density by 58% compared to controls.
“AAV9-mediated knockdown of SNX27 expression reduced spine density by 58% in comparison to control neurons”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataIn cultured hippocampal neurons, SNX17 and SNX27 exhibit prominent colocalization with each other, as well as with Retriever and Retromer, respectively.
“Our data show that, in cultured hippocampal neurons, SNX17 and SNX27 exhibit prominent colocalization with each other, as well with Retriever and Retromer, respectively.”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataSNX17 knockdown prevents the TTX-induced increase in mEPSC amplitude and the shift in the cumulative mEPSC amplitude distribution.
“By contrast, SNX17 knockdown prevented both the TTX-induced increase in mEPSC amplitude and the shift in the cumulative distribution.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
It may state two separate claims as one.
Findingown dataβ1-integrin is necessary for induction of cLTP and cLTD.
“Using a function-blocking antibody against β1-integrin, we confirmed the role of this cargo in cLTP, and demonstrated that it was also necessary for induction of cLTD.”
Quote in the paperSubstantial claim- Rests on an assumption: The function-blocking β1 integrin antibody specifically blocks β1 integrin function without other effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
It may state two separate claims as one.
Findingown datamNeonGreen-SNX17 exhibited prominent co-localization with early endosomal marker EEA1 and weaker co-localization with lysosomal marker LAMP1.
“We found that mNeonGreen-SNX17 exhibited prominent co-localization with the early endosomal marker EEA1, and weaker co-localization with the lysosomal marker LAMP1”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataIn cultured hippocampal neurons, SNX17 knockdown recapitulates overall synapse loss and specific loss of mushroom spines, associated with decreased mEPSC frequency but not mEPSC amplitude.
“Both the overall loss of synapses and specific loss of mushroom spines were recapitulated in cultured hippocampal neurons following SNX17 knockdown, but interestingly, these changes were associated with a decrease in mEPSC frequency (synapse loss), but not mEPSC amplitude.”
Quote in the paperSubstantial claim- Rests on an assumption: shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
- Rests on an assumption: mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
The quote only partly states this claim.
Findingown dataAcute SNX17 knockdown in CA1 pyramidal neurons of P8-10 rats reduced dendritic spine density by 40% compared to scrambled shRNA controls.
“our analysis revealed a pronounced reduction in dendritic spine density in SNX17-depleted CA1 pyramidal neurons, which showed a 40% decrease in spine density compared to control neurons expressing scr shRNA”
Quote in the paperSubstantial claimIt may state two separate claims as one.
InterpretationreasoningAt least some cargoes are recycled exclusively by a single pathway, and the SNX27-Retromer and SNX17-Retriever pathways have combinatorial roles as a consistent requirement for enduring forms of synaptic plasticity.
“As at least some cargoes are recycled exclusively by a single pathway, our data reveal combinatorial roles of SNX27-Retromer and SNX17-Retriever pathways as a consistent requirement for enduring forms of synaptic plasticity.”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
Study design and conductnone givenAll procedures were in accordance with the Guide for the Care and Use of Laboratory Animals from the National Institutes of Health and were approved by the University Committee on the Use and Care of Animals.
“All procedures were in accordance with the Guide for the Care and Use of Laboratory Animals from the National Institutes of Health and were approved by the University Committee on the Use and Care of Animals”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
Interpretationown dataSNX17 and SNX27 colocalize in the same subcellular compartment within neurons, predominantly within EEA1-positive early endosomes.
“Collectively, these results demonstrate that SNX17 and SNX27 colocalize in the same subcellular compartment within neurons, predominantly within EEA1-positive early endosomes”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Interpretationown dataCoordinate disruption of both pathways produced an additive loss of excitatory synapses, suggesting parallel roles in synapse maintenance.
“coordinate disruption of both pathways produced an additive loss of excitatory synapses, suggesting parallel roles in synapse maintenance”
Quote in the paperSubstantial claimProbably not a substantial claim.
PremisecitationSNX17 and the Retriever complex define a distinct recycling pathway that is independent of SNX27 and Retromer.
“SNX17 (Sorting Nexin 17) and the Retriever complex has been shown to define a distinct recycling pathway that is independent of SNX27 and Retromer”
Quote in the paperSubstantial claim0 of 1 sources checked- cites McNally et al., 2017 source
It may state two separate claims as one.
Interpretationown dataSNX17-Retriever and SNX27-Retromer function in the same cellular compartment and likely reside in the same endosomes.
“Together, this data suggests that both SNX17-Retriever and SNX27-Retromer function in the same cellular compartment and likely reside in the same endosomes, consistent with studies in non-neuronal cells (Chen et al., 2019; McDonald, 2021).”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Chen et al., 2019 source
- cites McDonald, 2021
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
It may state two separate claims as one.
Interpretationown dataBoth SNX17-Retriever and SNX27-Retromer pathways are required for the induction of cLTP, cLTD, and homeostatic upscaling.
“We also find that both pathways have broad roles in synaptic plasticity as each is required for the induction of cLTP, cLTD, and homeostatic upscaling (Figure 9).”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Interpretationown dataBoth the SNX17-Retriever and SNX27-Retromer pathways are essential for maintaining excitatory synapses in CA1 pyramidal neurons and in cultured hippocampal neurons.
“both the SNX17-Retriever and SNX27-Retromer pathway are essential for maintaining excitatory synapses in CA1 pyramidal neurons and in cultured hippocampal neurons”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Study design and conductnone givenAll experiments were repeated at least three times.
“All experiments were repeated at least three times”
Quote in the paperNot a substantial claimProbably not a substantial claim.
Study design and conductnone givenThe same laser settings and acquisition parameters were used for all treatment conditions in individual experiments.
“The same laser settings and acquisition parameters were used for all treatment conditions in individual experiments”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Interpretationown dataThe two recycling pathways independently contribute to synapse maintenance and thus at least partly function in parallel.
“This result suggests that the two recycling pathways independently contribute to synapse maintenance and thus at least partly function in parallel.”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Interpretationown dataAMPAR recycling is mediated exclusively by the SNX27-Retromer pathway and is independent of the SNX17-Retriever pathway.
“Together, these results show that AMPAR recycling is mediated exclusively by the SNX27-Retromer pathway and is independent of the SNX17-Retriever pathway.”
- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · boosted
“These results demonstrate that AMPARs are recycled exclusively by the SNX27-Retromer pathway, and not the SNX17-Retriever pathway.”
Quote in the paperSubstantial claim- Also stated in: § Combinatorial roles of SNX17-Retriever and SNX27-Retromer in diverse forms of long-lasting synaptic plasticity. · boosted
It may state two separate claims as one.
Interpretationown dataThe SNX17-Retriever and SNX27-Retromer pathways function largely in parallel at synapses, with their combinatorial action a key requirement for long-lasting forms of synaptic plasticity.
“our results support a model where the SNX17-Retriever and SNX27-Retromer pathways function largely in parallel at synapses, with their combinatorial action a key requirement for long-lasting forms of synaptic plasticity”
Quote in the paperSubstantial claimProbably not a substantial claim. The authors may not put it forward as true. It may state two separate claims as one.
Premiseown dataIf SNX17 and SNX27 comprise a common pathway, knocking down one should occlude the effects of depleting the other; if they comprise parallel pathways, effects of knocking down both should be additive.
“If SNX17 and SNX27 comprise a common pathway, knocking down one of these effectors should occlude the effects of depleting the other. If they comprise parallel pathways, then the effects of knocking down both should be additive.”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
Interpretationown dataDisrupting both pathways produces additive effects on synapse loss, demonstrating that each acts in parallel for synapse maintenance.
“disrupting both pathways produces additive effects on synapse loss, demonstrating that each act in parallel for synapse maintenance”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Interpretationown dataSNX27-Retromer and SNX17-Retriever function in parallel in maintaining synapses and act combinatorially in several different forms of synaptic plasticity.
“Our results demonstrate that SNX27-Retromer and SNX17-Retriever function in parallel in maintaining synapses and act combinatorially in several different forms of synaptic plasticity.”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Interpretationown dataβ1 integrin is a downstream effector of SNX17-Retriever for LTD and plays key roles in bidirectional forms of synaptic plasticity.
“These results reveal an important downstream effector of SNX17-Retriever for LTD and demonstrate that the same cargo, β1 integrin, can play key roles in bidirectional forms of synaptic plasticity.”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationHomeostatic upscaling is thought to play a key role in stabilizing neuronal activity through compensatory synaptic adaptations to offset chronic changes in neuronal firing rate.
“This form of plasticity is thought to play a key role in stabilizing neuronal activity through compensatory synaptic adaptations to offset chronic changes in neuronal firing rate (Wen and Turrigiano, 2024).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Wen and Turrigiano, 2024 source
Checked before — its earlier verdict is held back until a new check runs.
It may state two separate claims as one.
Interpretationown dataIn vivo or in vitro disruption of either the SNX17-Retriever or SNX27-Retromer pathway is accompanied by pronounced loss of excitatory synapses, and these pathways function in parallel to maintain synapses.
“Here, we show that in vivo or in vitro disruption of either pathway is accompanied by pronounced loss of excitatory synapses and that these pathways function in parallel to maintain synapses (Figure 9).”
Quote in the paperSubstantial claimIt may state two separate claims as one.
InterpretationcitationEach of the SNX27-Retromer and SNX17-Retriever pathways plays an instructive role in LTP.
“there is strong evidence that each pathway plays an instructive role in LTP.”
Quote in the paperSubstantial claimProbably not a substantial claim.
PremisecitationAMPAR recycling is a key source of additional receptors for LTP.
“AMPAR recycling is known to be a key source of additional receptors for LTP (Park et al., 2004; Diering and Huganir, 2018)”
Quote in the paperSubstantial claim0 of 2 sources checkedProbably not a substantial claim. The paper’s conclusions may not depend on it.
Study design and conductnone givenThe identity of all DNA constructs was verified by sequencing the entire coding region.
“In all cases, the identity of the constructs was verified by sequencing the entire coding region”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
Interpretationown dataSNX17-Retriever and SNX27-Retromer constitute parallel endomembrane recycling pathways that independently control maintenance of excitatory synapses.
“Taken together, these findings support the idea that SNX17-Retriever and SNX17-Retromer constitute parallel endomembrane recycling pathways that independently control maintenance of excitatory synapses.”
Quote in the paperSubstantial claimProbably not a substantial claim.
Study design and conductnone givenDendritic spine numbers were quantified manually by an observer blind to experimental conditions.
“Dendritic spine numbers were quantified manually by an observer blind to the experimental conditions”
Quote in the paperSubstantial claim
The paper relies on this without support.
The extent to which SNX17-Retriever and SNX27-Retromer pathways have unique or redundant roles in neurons is not known.
“but the extent to which these pathways have unique or redundant roles in neurons is not known”
The authors state this as an assumption.
The data distribution is normal.
“Data distribution was assumed to be normal, but this was not formally tested.”
The paper relies on this without support.
The neuronal cargoes of SNX17 are less well defined.
“but its neuronal cargoes are less well defined”
The paper relies on this without support.
The differential contributions of the two pathways to hippocampal synaptic plasticity, and the potential for convergence or coordination in response to neuronal activity, remain largely unexplored.
“However, the differential contributions of the two pathways to hippocampal synaptic plasticity, as well as the potential for convergence or coordination in response to neuronal activity, remain largely unexplored.”
The paper relies on this without support.
shRNA-mediated knockdown of SNX17, SNX27, VPS26B, or VPS26C specifically and effectively reduces the intended target protein without off-target effects.
“Following knockdown of SNX17 and SNX27 in cultured rat hippocampal neurons using shRNA, we assessed changes in synaptic function following chemically induced long-term potentiation (cLTP) using a well-established protocol (Lu et al., 2001; Park et al., 2004; Henry et al., 2018; Figure 5A).”
“To investigate the roles of each recycling pathway, we used lentivirus to express a scrambled shRNA (control) or shRNAs against SNX17 or SNX27.”
The paper relies on this without support.
The function-blocking β1 integrin antibody specifically blocks β1 integrin function without other effects.
“neurons were pretreated with a function-blocking β1 integrin antibody (10 μg/mL) for 30 min prior to cLTD induction and this antibody remained in the external solution throughout the experiment.”
The paper relies on this without support.
mEPSC frequency is a valid proxy for synapse number and mEPSC amplitude is a valid proxy for synaptic strength.
“we found a decrease in mEPSC frequency in neurons expressing shSNX17 or shSNX27 alone (relative to scr control), but a significant additive reduction of mEPSC frequency with combined SNX17 and SNX27 knockdown (Figure 4C, E).”
“these changes were associated with a decrease in mEPSC frequency (synapse loss), but not mEPSC amplitude.”
The paper relies on this without support.
The dual-labeling imaging protocol specifically labels and tracks endogenous AMPARs that are internalized and then recycled back to the surface.
“To examine this question, we adapted an imaging protocol used previously to monitor recycling of endogenous AMPARs in hippocampal neurons (Kim et al., 2005; see methods).”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Parallel-pathway conclusion names the wrong SNX protein
MinorThe conclusion calls the second pathway SNX17-Retromer, whereas the paper consistently identifies it as SNX27-Retromer.
“Taken together, these findings support the idea that SNX17-Retriever and SNX17-Retromer constitute parallel endomembrane recycling pathways that independently control maintenance of excitatory synapses.”
“Our results demonstrate that SNX27-Retromer and SNX17-Retriever function in parallel in maintaining synapses”
Age comparison misstates the study's own time point
MinorThe discussion describes the other studies as examining animals older than one month, but this study reports assessing CA1 neurons at P22-24, less than one month old.
“they examined synapses at a slightly older age (2–3 months) than in the other two studies (> 1 month)”
“we observed a marked reduction in synapse density in CA1 pyramidal neurons 2 weeks post-surgery (P22–24).”
SNX17 construct description specifies an SNX27 insert
MinorThe described insert contains SNX27, but the stated product is an mNeonGreen-SNX17 construct.
“To generate mNeonGreen-SNX17, the region containing the GS linker and SNX27 was PCR-amplified from pTO-GFP-SNX17”
“This generated the pAAV-eno-mNeonGreen-SNX17.”
Claim of unchanged basal function conflicts with reduced mEPSC frequency
MinorThe discussion says depletion of either protein does not alter basal synaptic function, while the results report a significant reduction in basal mEPSC frequency after either knockdown. Basal amplitude may be unchanged, but basal function as a whole is not.
“Our results show that depletion of either SNX17 or SNX27 prevents the induction of upscaling, without altering basal synaptic function.”
“we found that both SNX17 (Figure 2G–I) and SNX27 (Figure 2J–L) knockdown induced a significant ~ 50% reduction in mEPSC frequency.”
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Metadata
- Authors
- Chavis, G. D., Rivero-Ríos, P., Uygun, T., Tsukahara, T., Hayami, T., Lee, G. Y., Lee, M., Pace, C., Czesak, F. N., Hilde, K. L., Li, F., Iwase, S., Murphy, G. G., Morrow, J. D., Akil, H., Weisman, L. S., & Sutton, M. A.
- Affiliations
- University of Michigan (US)
- Corresponding author
- Weisman, Lois S.
- Sutton, Michael A.
- ORCID
- Venue
- Neuroscience
- Publisher
- Elsevier BV
- Published
- 2025-12
- Volume
- 591
- Pages
- 205-221
- ISSN
- 0306-4522 (ISSN-L)
- PMC
- PMC13052551
- OpenAlex
- W4416257067
- Cited by
- 0
- References
- 51
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Neuroscience (publishedVersion, cc-by)
- SSRN Electronic Journal (acceptedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (R01NS129138)
- University of Michigan
- Alzheimer's Association
- Hope for Depression Research Foundation
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
- Keywords
- synapse maintenance, synaptic plasticity, excitatory synapses, CA1 pyramidal neurons, hippocampal neurons, early endosomes, long-term potentiation, long-term depression, homeostatic synaptic scaling, cargo specificity, neuronal development
- MeSH terms
- Animals, Cells, Cultured, Hippocampus, Male, Neuronal Plasticity, Neurons, Endosomes, Synapses, Rats, Sprague-Dawley, Rats, Sorting Nexins
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-11-09, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
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Cited sources are checked with a language model’s help (gpt-6-sol).
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