Cited by 96Alzheimer's disease research and treatmentsCellular transport and secretionDementia and Cognitive Impairment Research

BIN1 regulates BACE1 intracellular trafficking and amyloid-β production

Open access
Miyagawa, Toji, Ebinuma, Ihori, Morohashi, Yuichi, Hori, Yukiko, Young Chang, Mee, Hattori, Haruhiko, Maehara, Tomoaki, Yokoshima, Satoshi +5 more·2016·Human Molecular Genetics

Abstract

BIN1 is a genetic risk factor of late-onset Alzheimer disease (AD), which was identified in multiple genome-wide association studies. BIN1 is a member of the amphiphysin family of proteins, and contains N-terminal Bin-Amphiphysin-Rvs and C-terminal Src homology 3 domains. BIN1 is widely expressed in the mouse and human brains, and has been reported to function in the endocytosis and the endosomal sorting of membrane proteins. BACE1 is a type 1 transmembrane aspartyl protease expressed predominantly in neurons of the brain and responsible for the production of amyloid-β peptide (Aβ). Here we report that the depletion of BIN1 increases cellular BACE1 levels through impaired endosomal trafficking and reduces BACE1 lysosomal degradation, resulting in increased Aβ production. Our findings provide a mechanistic role of BIN1 in the pathogenesis of AD as a novel genetic regulator of BACE1 levels and Aβ production.

AI snapshot

Written from the paper’s full text.

TL;DR

BIN1 depletion increases cellular BACE1 by impairing its trafficking from early endosomes to lysosomes, reducing BACE1 degradation and increasing amyloid-β production. The BIN1 BAR domain binds the BACE1 C-terminal intracellular domain, linking an Alzheimer disease risk gene to BACE1 metabolism.

Key findings

  • In primary cortical neurons from Bin1 flox/flox mice, Cre-mediated Bin1 depletion increased BACE1 protein and sAPPβ secretion and increased secreted Aβ40 and Aβ42 (n = 6, P < 0.05), without altering the Aβ42 proportion; BACE1 mRNA was unchanged at 99.8 ± 0.5% of control (n = 6).
  • Bin1 RNAi in Neuro2a and HeLa cells increased BACE1 and Aβ; membrane BACE1 activity was significantly increased in Neuro2a cells (n = 9), and Bin1-ablated HeLa cells expressing APP C99 showed no change in Aβ secretion.
  • SNAP-BACE1 tracking showed labeled BACE1 largely disappeared from EEA1-positive early endosomes by 120 min in control cells but remained in Bin1-depleted cells; sucrose gradients showed reduced BACE1 in the LAMP1-enriched lysosomal fraction 2.
  • GST pulldown showed the BIN1 BAR domain, but not the SH3 domain, bound the BACE1 C-terminal intracellular domain; BIN1ΔBAR expression increased BACE1 and Aβ similarly to Bin1 depletion.

Methods

  • Primary cortical neurons from P1 Bin1 flox/flox mice were infected with EGFP-NLS or EGFP-NLS-Cre lentivirus; Neuro2a and HeLa cells were treated with Bin1 siRNA. Readouts included immunoblotting, sandwich ELISAs for Aβ40/Aβ42, qRT-PCR, and an in vitro BACE1 activity assay using JMV2236.
  • BACE1 trafficking was assessed by SNAP-BACE1 surface labeling and uptake at 30 and 120 min with EEA1 immunostaining, sucrose density gradient fractionation, GST pulldown, and coimmunoprecipitation. Groups were compared by two-tailed Student’s t-test with SEM; significance set at P < 0.05 and P < 0.005.

Limitations

  • Stated: whether BIN1 directly or indirectly associates with the BACE1 cytoplasmic domain remains unclear, and whether BIN1 expression is altered in AD patients with the rs6733839 polymorphism is controversial and requires systematic expression and splicing analyses.
  • Evident from the text: the experimental evidence comes from cultured primary neurons and cell lines (Neuro2a, HeLa) using depletion and mutant overexpression, with no in vivo AD model or human AD tissue validation presented in this paper.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1093/hmg/ddw146

Cites

63 of 63 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

17 of 23 cited sources checked · 9 supported · 0 flagged · accuracy not yet measured

  • Premisecitation

    Ubiquitination at lysine 501 in the C-terminus of BACE1 is required for GGA3-mediated lysosomal targeting and degradation of BACE1.

    “Ubiquitination at lysine 501 in the C-terminus of BACE1 is required for GGA3-mediated lysosomal targeting and the degradation of BACE1 (29,30).”
    Quote in the paperSubstantial claim2 of 2 sources checked
    • cites [29] source
    • cites [30] source

      Figure 5 and its accompanying results (page not provided) show that Lys-501 is in BACE1’s C-terminus and that the K501R substitution greatly reduces BACE1 ubiquitination. The paper also links GGA3’s ubiquitin-binding ability to regulation of BACE1 levels and discusses lysosomal degradation, but it does not show that ubiquitination specifically at Lys-501 is required for GGA3-mediated lysosomal targeting or degradation. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
  • Findingown data

    The BAR domain, but not the SH3 domain, of BIN1 is required for binding of BIN1 with BACE1.

    “We found that the BAR domain, but not the SH3 domain of BIN1, was required for the binding of BIN1 with BACE1 (Fig. 5C).”
    • Also stated in: § Discussion · plain
      “We found that the BAR domain of BIN1 was a BACE1-interaction domain, although it still remains unclear as to whether BIN1 directly or indirectly associates with the cytoplasmic domain of BACE1.”
    Quote in the paperSubstantial claim
  • Findingown data

    Neuro2a cells expressing BIN1DBAR showed increased Ab secretion.

    “Furthermore, Neuro2a cells expressing BIN1DBAR showed increased level of BACE1 as well as Ab secretion, similarly to that observed in Bin1-depleted cells (Fig. 6).”
    Quote in the paperSubstantial claim
  • Findingown data

    In Bin1-depleted cells, at 120 minutes after labeling, the majority of labeled SNAP-tagged BACE1 remained in EEA1-positive early endosomes.

    “Intriguingly, in the Bin1-depleted cells, the majority of labeled SNAP-tagged BACE1 still remained in the EEA1-positive early endosomes, suggesting that BIN1 functions in the intracellular trafficking of BACE1 from the early endosomes.”
    Quote in the paperSubstantial claim
  • Findingown data

    GST-fused BACE1 C-terminal intracellular domain (B1CT) bound to BIN1 holoprotein expressed in Neuro2a cells.

    “We found that the GST-fused BACE1 C-terminal intracellular domain (B1CT) bound to the BIN1 holoprotein expressed in Neuro2a cells.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. 9
  • May combine two claims. 11
  • Classified as probably not a substantial claim.

    Premisecitation

    The BAR domain is known as a binding platform for several protein-protein interactions.

    “However, the BAR domain is also known as a binding platform for several protein-protein interactions (37,38), suggesting that BACE1 is a novel cargo protein of BIN1 that is sorted from early endosomes to late endosomes/lysosomes.”
    Quote in the paperSubstantial claim2 of 2 sources checked
  • May combine two claims.

    Premisecitation

    Cellular transferrin levels were increased in Bin1 KO MEFs without an effect on transferrin internalization.

    “Consistent with this, cellular transferrin levels were increased in Bin1 KO MEFs without an effect on transferrin internalization (18).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
  • May combine two claims.

    Premisecitation

    Depletion of Bin1 in HeLa cells impaired recycling of transferrin, but not endocytosis, and cellular transferrin accumulated in the juxtanuclear compartment.

    “In addition, the depletion of Bin1 in HeLa cells impaired the recycling of transferrin, but not endocytosis, and cellular transferrin was accumulated in the juxtanuclear compartment (16).”
    Quote in the paperSubstantial claim1 of 1 sources checked
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    The SH3 domain regulates the conformation of the BAR domain and its interaction with other molecules.

    “In addition, the SH3 domain regulates the conformation of the BAR domain and its interaction with other molecules (34,35).”
    Quote in the paperNot a substantial claim2 of 2 sources checked
    • cites [34] source
    • cites [35] source

      The Results and Discussion (page unavailable) show that SH3 domains inhibit membrane binding by endophilin and amphiphysin, and that binding dynamin’s proline-rich domain to SH3 reverses this inhibition. The paper suggests an SH3–BAR interaction but does not establish that SH3 regulates the BAR domain’s conformation. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    Depletion of GGA3 resulted in reduced degradation of BACE1 in lysosomes and increased Ab production, similar to Bin1-depleted cells.

    “The depletion of GGA3, which recognizes ubiquitinated BACE1, resulted in the reduced degradation of BACE1 in the lysosomes and increased Ab production in a similar manner to that observed in Bin1-depleted cells (30,41).”
    Quote in the paperSubstantial claim2 of 2 sources checked
    • cites [30] source
    • cites [41] source

      The Introduction states that GGA3 depletion impairs BACE1 sorting to lysosomes, where BACE1 is normally degraded. The Results report increased Aβ in Gga3-null primary neuronal cultures, but no increase in young adult Gga3-null mouse brains. Our copy does not establish that GGA3 recognizes ubiquitinated BACE1 or assess the comparison with Bin1-depleted cells. (LLM, conf=0.85)

      Experimental — accuracy not yet measured
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    The BAR domain was initially implicated in lipid binding of BIN1 and in sensing membrane curvature.

    “The BAR domain was initially implicated in the lipid binding of BIN1 and in sensing membrane curvature (11,36).”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites [11] source
    • cites [36] source
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    EHD proteins regulate BIN1 activity and are required for endocytic vesicle recycling together with Rab8a, Rab11-FIP2 and MICAL-L1.

    “EHD proteins regulate BIN1 activity and are required for endocytic vesicle recycling together with Rab8a, Rab11-FIP2 and MICAL-L1 (16,43,44).”
    Quote in the paperNot a substantial claim3 of 3 sources checked
    • cites [16] source

      The Results section (‘Mammalian Bin1/Amphiphysin2 functions in recycling’; page not provided) reports that BIN1 is present on EHD1-positive recycling tubules and that BIN1 depletion delays recycling. The paper describes BIN1 as functioning in EHD1-regulated recycling, but does not establish that EHD proteins regulate BIN1 activity. It also does not show recycling involving Rab8a, Rab11-FIP2 and MICAL-L1 together; Rab11-FIP2 appears in a reference title, not in that finding. (LLM, conf=0.87)

      Experimental — accuracy not yet measured
    • cites [43] source

      The EHD1 section reports that EHD1 regulates receptor recycling and interacts with Rab11-FIP2; the membrane-binders section identifies MICAL-L1 as an EHD1 partner. The latter section describes Rab8a as a marker of EHD1-decorated tubules, not as a demonstrated partner required for recycling. It also describes EHD1 and BIN1 as potentially cooperating in membrane tubulation, not EHD proteins regulating BIN1 activity. Page numbers are unavailable in our copy. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [44] source

      The Results section, “EHD1 regulates BIN1 tubule formation” (page not supplied), shows that EHD1 affects BIN1-induced tubules. The Results on defective endosomal trafficking show impaired recycling in EHD1-null myoblasts, and the Introduction names MICAL-L1 as an EHD-interacting protein. Our copy does not establish that EHD proteins recycle vesicles together with Rab8a or Rab11-FIP2; it discusses Rab11, but not Rab11-FIP2. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Among known BIN1-binding proteins, EHD family proteins play a role in trafficking of internalized BACE1 in neurons.

    “It is noteworthy to mention that among the known BIN1-binding proteins, EHD family proteins play a role in the trafficking of internalized BACE1 in neurons (42).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Loss of EHD1 function compromised recycling and axonal sorting of internalized BACE1, thereby reducing Ab production.

    “Loss of EHD1 function compromised the recycling and axonal sorting of the internalized BACE1, thereby reducing Ab production (42).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [42] source

      The Results section reports that impaired EHD1 function reduced axonal sorting of internalized BACE1, and the Introduction reports that loss of EHD1 expression reduced Aβ production in hippocampal neurons. But the Results do not establish compromised BACE1 recycling: internalized BACE1 still reached recycling endosomes, and its steady-state dendritic surface localization was not significantly affected. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Synaptic protein snapin, an EHD1-binding protein, was identified as a regulator of endosome-to-lysosome retrograde transport of BACE1.

    “Recently, the synaptic protein snapin, which is an EHD1-binding protein, was identified as a regulator of the endosome-to-lysosome retrograde transport of BACE1 (27,45).”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites [27] source

      The Discussion states that Snapin-mediated retrograde transport delivers BACE1 from late endosomes to somatic lysosomes for degradation. The Results also show impaired BACE1 retrograde transport in snapin-deficient neurons. Our copy does not identify Snapin as an EHD1-binding protein (searched: “EHD1-binding protein snapin” and “EHD1”), so that descriptor is not supported by this source. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [45] source
  • May combine two claims.

    Findingown data

    In sucrose density gradient fractionation of Neuro2a cells, LAMP1 was detected predominantly in low-density fraction 2, whereas other organelle markers were detected diffusely in the high-density fraction.

    “We found that LAMP1 was detected predominantly in the low density fraction (fraction 2), whereas other organelle markers were detected diffusely in the high-density fraction (Fig. 4A).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    BACE1 is a novel cargo protein of BIN1 that is sorted from early endosomes to late endosomes/lysosomes.

    “suggesting that BACE1 is a novel cargo protein of BIN1 that is sorted from early endosomes to late endosomes/lysosomes.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Swedish mutant APP is cleaved by BACE1 in early secretory compartments such as the trans-Golgi network.

    “This is also consistent with a previous report that Bin1 RNAi failed to affect Ab production in HeLa cells expressing Swedish mutant APP (39), which is cleaved by BACE1 in early secretory compartments such as the trans-Golgi network (40).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [40] source
  • May combine two claims.

    Interpretationown data

    In Bin1-depleted cells, intracellular trafficking of BACE1 from early endosomes to the lysosomal pathway is impaired, resulting in reduced degradation of BACE1.

    “These results indicated that the intracellular trafficking of BACE1 from the early endosomes to the lysosomal pathway was impaired in the Bin1 depleted cells, resulting in the reduced degradation of BACE1.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    The level and activity of BACE1 is modulated by both ubiquitin-dependent and ubiquitin-independent trafficking, regulated by GGA3 and BIN1, respectively.

    “Thus, the level and activity of BACE1 is modulated by both ubiquitin-dependent and ubiquitin-independent trafficking, which are regulated by GGA3 and BIN1, respectively.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationown data

    Depletion of BIN1 caused accumulation of BACE1 in early endosomes, eventually leading to increased Ab production.

    “In fact, we found that the depletion of BIN1 caused the accumulation of BACE1 in the early endosomes where most of the b-cleavage of APP occurs, eventually leading to an increase in the production of Ab.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Most beta-cleavage of APP occurs in early endosomes.
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The SH3 domain of BIN1 is a molecular platform for the biogenesis of membrane tubules.

    “Previous studies suggested that the SH3 domain of BIN1 is a molecular platform for the biogenesis of membrane tubules (31)(32)(33).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites (31)(32)(33)

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

17 of 17
  • The paper relies on this without support.

    Most beta-cleavage of APP occurs in early endosomes.

    “where most of the b-cleavage of APP occurs”
  • The paper relies on this without support.

    The BACE1/K501R mutant cannot be ubiquitinated.

    “which cannot be ubiquitinated”
  • The paper relies on this without support.

    Increased amyloid-β (Aβ) production increases Alzheimer's disease (AD) risk.

    “Our data suggested that a loss of BIN1 expression and/or function leads to the increased Ab production and AD risk.”
3 of 3

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • BIN1, CD2AP and PICALM modulate APP metabolism and the subsequent increase in Aβ production.

    “Based on pathway enrichment analyses, three GWAS-defined genes linked with endocytosis (BIN1, CD2AP and PICALM) have been proposed to modulate APP metabolism and the subsequent increase in Aβ production:”

    From The new genetic landscape of Alzheimer’s disease: from amyloid cascade to genetically driven synaptic failure hypothesis? (2019) · cites this paper as [91]

    The Abstract (page not supplied) reports that BIN1 depletion impairs BACE1 trafficking and increases Aβ production, supporting the BIN1 portion of the claim. The cited paper does not establish the same effect for CD2AP or PICALM, and the passages do not attribute the three-gene proposal to a pathway enrichment analysis. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • BIN1 depletion is associated with an increase in intracellular Aβ42, potentially through regulation of BACE1 trafficking and accumulation in early endosomes.

    “BIN1 depletion was associated with an increase in intracellular Aβ42, potentially through the regulation of the β-secretase (BACE1) trafficking and accumulation in early endosomes [91, 137].”

    From The new genetic landscape of Alzheimer’s disease: from amyloid cascade to genetically driven synaptic failure hypothesis? (2019) · cites this paper as [91]

    The Discussion reports that BIN1 depletion causes BACE1 to accumulate in early endosomes and increases Aβ production. However, the reported Aβ42 measurements are of secreted Aβ42 (Figures 1B and 2B/E), not intracellular Aβ42; the intracellular increase reported is in BACE1. (LLM, conf=0.90)

    Experimental — accuracy not yet measured

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.

  • GST pull-down assay uses different cell types in the results and figure caption

    Minor

    The results say the BIN1 protein used in the GST pull-down was expressed in Neuro2a cells, whereas the caption for that assay says the lysate came from HeLa cells.

1 of 1

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Authors
Miyagawa, T., Ebinuma, I., Morohashi, Y., Hori, Y., Young Chang, M., Hattori, H., Maehara, T., Yokoshima, S., Fukuyama, T., Tsuji, S., Iwatsubo, T., Prendergast, G. C., & Tomita, T.
Affiliations
  • The University of Tokyo (JP)
  • Nagoya University (JP)
  • Lankenau Institute for Medical Research (US)
Corresponding author
Tomita, Taisuke
Venue
Human Molecular Genetics
Published
2016-05-14
Volume
25
Issue
14
Pages
ddw146
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2393854800
Cited by
95
References
60
Citations by year
2026: 2 · 2025: 5 · 2024: 9 · 2023: 9 · 2022: 17 · 2021: 11 · 2020: 9 · 2019: 11 · 2018: 9 · 2017: 9 · 2016: 4
FWCI
7.52
Type
journal article
Language
en
Open access
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, cc-by-nc-nd)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science (15H02492, 14J11303)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
BIN1, BACE1, amyloid-beta production, Alzheimer's disease, late-onset Alzheimer's disease, endosomal trafficking, lysosomal degradation, endocytosis, amphiphysin, genetic risk factors
MeSH terms
Alzheimer Disease, Animals, Brain, Endocytosis, Humans, Lysosomes, Neurons, Nuclear Proteins, Endosomes, Amyloid beta-Peptides, Aspartic Acid Endopeptidases, Mice, Knockout, Protein Transport, Tumor Suppressor Proteins, Adaptor Proteins, Signal Transducing, Mice, Amyloid Precursor Protein Secretases, Proteolysis

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