Lipidome and proteome of astrocyte and microglia ApoE lipoprotein reveal differences based on cell type and ApoE isoform

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Overexpression of ABCA1 ameliorated Aβ pathology in a mouse model of Aβ amyloidosis.

“Previous research has shown that the overexpression of ABCA1 ameliorated Aβ pathology in a mouse model of Aβ amyloidosis and that treatment with an LXR agonist was protective in a mouse model of tau-mediated neurodegeneration (65, 66).”

• cites [65] Litvinchuk, 2024, Amelioration of Tau and ApoE4-linked glial lipid accumulation and neurodegeneration with an LXR agonist, Neuron sourceMisattributed

  The Results report that ABCA1 overexpression reduced tau pathology in P301S/ApoE4 mice, not Aβ pathology in an amyloidosis model. The only mention of reduced amyloid deposition is the title of a different study, by Wahrle and colleagues, cited in the Results as reference 39. This paper does support the citing sentence’s separate claim about LXR-agonist treatment in a tauopathy model. (LLM, conf=0.85) It matches “Overexpression of ABCA1 reduces amyloid deposition in the PDAPP mouse model of Alzheimer disease” (2008) instead.

  Checked by a reasoning model — may be wrong.

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Two copies of the APOE4 allele increase AD risk by about 12-fold relative to APOE3.

“with one copy of the APOE4 allele increasing disease risk by about 4-fold and two copies increasing disease risk by about 12-fold relative to the most prevalent APOE3 allele (7, 8).”

• cites [7] Strittmatter, 1993, Apolipoprotein E: high-avidity binding to beta-amyloid and increased frequency of type 4 allele in late-onset familial Alzheimer disease, Proc. Natl. Acad. Sci. U. S. A. sourcePartly supported

  The allele-association passage (Materials and Methods; page not provided) reports that APOE-e4 was more frequent in patients with familial Alzheimer disease than in controls. It does not report risk by number of copies or a 12-fold risk relative to APOE3. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [8] Corder, 1993, Gene dose of apolipoprotein E type 4 allele and the risk of Alzheimer's disease in late onset families, Science sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

In the context of AD pathology, such as amyloid-β plaques or tauopathy, microglia strongly upregulate APOE expression.

“In the context of AD pathology, such as amyloid-β (Aβ) plaques or tauopathy, microglia strongly upregulate APOE expression (4, 11).”

• cites [4] Keren-Shaul, 2017, A unique microglia type associated with restricting development of Alzheimer's Disease, Cell sourcePartly supported

  The Results (page unavailable) report increased Apoe expression as microglia transition to disease-associated microglia in an AD mouse model; the paper also locates these cells near Aβ plaques. The cited paper does not establish APOE upregulation in tauopathy, and its finding concerns a microglial subtype rather than microglia generally. (LLM, conf=0.87)

  Experimental — accuracy not yet measured
• cites [11] Krasemann, 2017, The TREM2-APOE pathway drives the transcriptional phenotype of dysfunctional microglia in neurodegenerative diseases, Immunity sourcePartly supported

  The Results section on neuritic Aβ plaques reports increased APOE expression in microglia close to Aβ plaques, and identifies Apoe as among the most upregulated genes in the disease-associated microglial subset. The passages do not establish the same finding specifically for tauopathy. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Astrocyte-derived ApoE is important for supporting neuronal health.

“with astrocyte-derived ApoE shown to be important for supporting neuronal health (9, 10).”

• cites [9] Fagan, 1996, Apolipoprotein E-containing high density lipoprotein promotes neurite outgrowth and is a ligand for the low density lipoprotein receptor-related protein, J. Biol. Chem. sourcePartly supported

  The introductory passage says CNS apoE is synthesized by astrocytes, and Results and Discussion reports that apoE-enriched HDL increased neurite outgrowth in a CNS-derived neuronal cell line. The study does not directly test astrocyte-derived apoE or establish that it is important for neuronal health more broadly. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [10] Mahley, 2016, Central nervous system lipoproteins: ApoE and regulation of cholesterol metabolism, Arterioscler Thromb. Vasc. Biol. sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoE is the dominant constituent of the isolated ApoE lipoproteins.

“ApoE is the dominant constituent of the isolated ApoE lipoproteins, as expected (1, 2).”

• cites [1] Fagan, 1999, Unique lipoproteins secreted by primary astrocytes from wild type, apoE (-/-), and human apoE transgenic mice, J. Biol. Chem. sourceSupported
• cites [2] LaDu, 1998, Nascent astrocyte particles differ from lipoproteins in CSF, J. Neurochem. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

In the context of demyelination, ApoE4 causes microglia to be hypoactive in clearing myelin debris and to accumulate higher levels of lipid droplets compared to ApoE3-expressing microglia.

“In the context of demyelination, ApoE4 has been reported to cause microglia to be hypoactive in clearing myelin debris and to accumulate higher levels of lipid droplets compared to ApoE3-expressing microglia (21).”

• cites [21] Wang, 2022, Opposing effects of apoE2 and apoE4 on microglial activation and lipid metabolism in response to demyelination, Mol. Neurodegener. sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

This impaired microglial response leads to greater neuritic dystrophy around plaques, indicative of greater neuronal damage.

“This impaired microglial response leads to greater neuritic dystrophy around plaques, indicative of greater neuronal damage (24, 25).”

• cites [24] Ulrich, 2018, ApoE facilitates the microglial response to amyloid plaque pathology, J. Exp. Med. sourcePartly supported

  The ‘Increased neuritic dystrophy in Apoe -/-;APP PS1 mice’ section reports reduced plaque-associated microgliosis alongside significantly more dystrophic neurites and interprets this as consistent with greater plaque-associated neuronal damage. But the discussion says the function of microgliosis remains poorly understood and offers reduced clearance of damaged neurites as an alternative explanation. The source therefore supports the association, not the claim that the impaired microglial response causes greater neuronal damage. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [25] Condello, 2015, Microglia constitute a barrier that prevents neurotoxic protofibrillar Abeta42 hotspots around plaques, Nat. Commun. sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Higher production of lipids in ApoE4-expressing astrocytes affects neuronal health and function and increases Aβ production in cocultures of astrocytes and neurons.

“This higher production of lipids in ApoE4-expressing astrocytes has been reported to affect neuronal health and function and increase Aβ production in cocultures of astrocytes and neurons (16, 18, 19).”

• cites [16] Tcw, 2022, Cholesterol and matrisome pathways dysregulated in astrocytes and microglia, Cell sourcePartly supported

  The Results section on altered lipid metabolism reports upregulated cholesterol synthesis in APOE4 astrocytes. The mixed-culture Results discuss astrocyte–neuron communication, but do not show that the increased lipid production harms neuronal health or function or raises Aβ production in those cultures. The Discussion’s mention of increased Aβ concerns a separate organoid model, not this finding. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [18] Lee, 2021, APOE4-carrying human astrocytes oversupply cholesterol to promote neuronal lipid raft expansion and abeta generation, Stem Cell Rep. sourcePartly supported

  The Results section reports that medium conditioned by ApoE4 astrocytes increased neuronal APP expression and Aβ42 secretion; the Discussion links this effect to an oversupply of cholesterol. The experiments described used conditioned medium, not astrocyte–neuron cocultures, and the cited passages do not establish broader effects on neuronal health or function. Page numbers are unavailable in our copy. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [19] Zhao, 2017, APOE epsilon4/epsilon4 diminishes neurotrophic function of human iPSC-derived astrocytes, Hum. Mol. Genet. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

One copy of the APOE4 allele increases AD risk by about 4-fold relative to APOE3.

“with one copy of the APOE4 allele increasing disease risk by about 4-fold and two copies increasing disease risk by about 12-fold relative to the most prevalent APOE3 allele (7, 8).”

• cites [7] Strittmatter, 1993, Apolipoprotein E: high-avidity binding to beta-amyloid and increased frequency of type 4 allele in late-onset familial Alzheimer disease, Proc. Natl. Acad. Sci. U. S. A. sourcePartly supported

  The allele-association passage (Materials and Methods; page unavailable) reports that APOE-e4 was more frequent among patients with late-onset familial Alzheimer disease than among controls (0.50 versus 0.16). It does not report disease risk for people with one copy of APOE4 relative to APOE3, or a fourfold risk estimate. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [8] Corder, 1993, Gene dose of apolipoprotein E type 4 allele and the risk of Alzheimer's disease in late onset families, Science sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Microglia are implicated in the initial fibrillization of Aβ, where ApoE and Aβ aggregates colocalize in lysosomes.

“Microglia have also been implicated in the initial fibrillization of Aβ, where ApoE and Aβ aggregates colocalize in lysosomes (12).”

• cites [12] Kaji, 2024, Apolipoprotein E aggregation in microglia initiates Alzheimer’s disease pathology by seeding β-amyloidosis, Immunity sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The timsTOF SCP mass spectrometer platform provides robust quantitative performance, with a linear dynamic range of approximately 4-5 orders of magnitude for protein quantification.

“This platform provides robust quantitative performance, with a linear dynamic range of approximately 4–5 orders of magnitude for protein quantification (33, 34).”

• cites [33] Brunner, 2022, Ultra-high sensitivity mass spectrometry quantifies single-cell proteome changes upon perturbation, Mol. Syst. Biol. sourcePartly supported

  The Results section, “Noise-reduced quantitative mass spectra” (page unavailable), reports a linear protein-quantification response and excellent replicate reproducibility, but its tested dilution series spans 25 to 0.8 ng—not 4–5 orders of magnitude. The Methods describe an approximately threefold gain in instrument dynamic range, not a total linear quantification range of 4–5 orders. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [34] Skowronek, 2025, An accessible workflow for high-sensitivity proteomics using parallel accumulation-serial fragmentation (PASEF), Nat. Protoc. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Treatment of astrocytes with LXR agonists upregulates expression of ABCA1 and ABCG1, promoting expression and secretion of ApoE from astrocytes.

“Treatment of astrocytes with LXR agonists has been previously reported to upregulate the expression of ABCA1 and ABCG1, promoting the expression and secretion of ApoE from astrocytes (63, 64).”

• cites [63] Liang, 2004, A liver X receptor and retinoid X receptor heterodimer mediates apolipoprotein E expression, secretion and cholesterol homeostasis in astrocytes, J. Neurochem. sourceNot checked — no full text of the source
• cites [64] Karten, 2006, Expression of ABCG1, but not ABCA1, correlates with cholesterol release by cerebellar astroglia, J. Biol. Chem. sourcePartly supported

  The Abstract reports that the LXR agonist TO901317 upregulated ABCA1 and ABCG1 in cultured cerebellar murine astroglia. The section on cholesterol efflux to exogenous ApoA1 reports increased apoE secretion after treatment, but the passages do not establish increased apoE expression or show that transporter upregulation caused the secretion increase. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The limit of quantification typically reaches the low attomole range to several tens or even hundreds of attomoles, depending on peptide ionization properties and sample matrix complexity.

“The limit of quantification typically reaches the low attomole range (1 attomole = (10−18 mol) × (6.022 × 1023 molecules/mol) = 6.022 × 105 molecules) to several tens or even hundreds of attomoles, depending on peptide ionization properties and sample matrix complexity (35, 36).”

• cites [35] Kuzyk, 2009, Multiple reaction monitoring-based, multiplexed, absolute quantitation of 45 proteins in human plasma, Mol. Cell Proteomics sourcePartly supported

  In the LOQ discussion (Fig. 4 section; page not given), the paper reports attomole-range limits for 27 of 45 peptides, and Table II lists examples in the tens and hundreds of attomoles. It does not establish that this range is typical across assays: the remaining peptides had higher limits, including albumin at 4.3 femtomoles. The paper discusses peptide ionization and matrix interference, but does not specifically show that sample-matrix complexity determines the stated range. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [36] Vidova, 2017, A review on mass spectrometry-based quantitative proteomics: targeted and data independent acquisition, Anal Chim. Acta sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Clu has been previously implicated as a risk factor for AD.

“Clu has been previously implicated as a risk factor for AD (53, 54).”

• cites [53] Lambert, 2009, Genome-wide association study identifies variants at CLU and CR1 associated with Alzheimer's disease, Nat. Genet. sourceSupported
• cites [54] Harold, 2009, Genome-wide association study identifies variants at CLU and PICALM associated with Alzheimer's disease, Nat. Genet. sourceSupported

It may state two separate claims as one.

Astrocyte-secreted ApoE2 tends to form the largest lipoproteins, with ApoE4 forming the smallest particles; however, the distribution of the size range of all of the particles substantially overlaps.

“In line with previous reports (49), astrocyte-secreted ApoE2-secreted lipoprotein tends to form the largest lipoproteins, with ApoE4 forming the smallest particles; however, the distribution of the size range of all of the particles substantially overlaps (Fig. 1D).”

• cites [49] Strickland, 2024, Apolipoprotein E secreted by astrocytes forms antiparallel dimers in discoidal lipoproteins, Neuron sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Apolipoprotein D is primarily produced in the brain and mediates interaction between HDL and LDL in plasma.

“Apolipoprotein D is an apolipoprotein primarily produced in the brain and is associated with mediating the interaction between HDL and LDL in the plasma (60, 61).”

• cites [60] Braesch-Andersen, 2014, ApoD mediates binding of HDL to LDL and to growing T24 carcinoma, PLoS One sourcePartly supported

  The Abstract and Discussion support ApoD’s role in HDL–LDL binding in human plasma, though the Discussion presents its physiological mediator role as a proposal. The Introduction says ApoD is expressed throughout the body, notably by brain glial cells and fibroblasts; it does not establish that ApoD is primarily produced in the brain. Page numbers are not provided in our copy. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [61] Rassart, 2000, Apolipoprotein D, Biochim. Biophys. Acta sourceNot checked — no full text of the source

It may state two separate claims as one.

A faint band at ∼72 kDa represents an SDS-resistant dimer that is not reducible, suggesting that this band does not represent a disulfide-linked dimer in ApoE4-derived samples.

“A faint band is seen at ∼72 kDa that represents an SDS-resistant dimer that is not reducible (Fig. 1C), suggesting that this band does not represent a disulfide-linked dimer in ApoE4-derived samples, in line with previous results (49).”

• cites [49] Strickland, 2024, Apolipoprotein E secreted by astrocytes forms antiparallel dimers in discoidal lipoproteins, Neuron sourcePartly supported

  The Cryo-EM of recombinant ApoE lipoproteins section reports two ApoE4 proteins in a dimer, and Additional information says SDS-PAGE was performed under reducing conditions. However, our copy does not identify a faint ∼72 kDa band or establish that an ApoE4 dimer remains SDS-resistant and non-reducible. The source supports the presence of ApoE4 dimers, but not the specific band interpretation. (LLM, conf=0.82)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Mfge8 is secreted by microglia and promotes phagocytosis of apoptotic neuronal cells by the microglia-like BV2 cell line.

“This protein has been previously reported to be secreted by microglia and to promote the phagocytosis of apoptotic neuronal cells by the microglia-like BV2 cell line (59).”

• cites [59] Fuller, 2008, MFG-E8 regulates microglial phagocytosis of apoptotic neurons, J. Neuroimmune Pharmacol. sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Microglia may play a direct role in the fibrillization of Aβ through the uptake of Aβ bound to ApoE.

“Microglia may also play a direct role in the fibrillization of Aβ through the uptake of Aβ bound to ApoE”

• cites [12] Kaji, 2024, Apolipoprotein E aggregation in microglia initiates Alzheimer’s disease pathology by seeding β-amyloidosis, Immunity sourcePartly supported

  The Discussion (p. 14) proposes that microglia can compact phagocytosed Aβ within lysosomes with APOE’s help, and Figure 7 (p. 15) shows internalization of both Aβ and APOE after co-incubation. These passages support a possible direct role in Aβ aggregation, but do not establish that Aβ was bound to APOE when taken up. (LLM, conf=0.83)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Serpina3n inhibits granzyme B activity.

“Serpina3n has been reported to inhibit granzyme B activity”

• cites [92] Ang, 2011, Serpina3n attenuates granzyme B-mediated decorin cleavage and rupture in a murine model of aortic aneurysm, Cell Death Dis sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Mfge8 is a biomarker for stress cardiomyopathy along with ApoE.

“It has also been identified as a biomarker for stress cardiomyopathy along with ApoE (79).”

• cites [79] Pan, 2020, MFGE8, ALB, APOB, APOE, SAA1, A2M, and C3 as novel biomarkers for stress cardiomyopathy, Cardiovasc. Ther. sourcePartly supported

  The Abstract Conclusion identifies MFGE8 and APOE as hub genes of stress cardiomyopathy and says they might be used as diagnostic biomarkers. The citing sentence presents MFGE8 as an established biomarker, whereas the paper’s Discussion and Conclusions say the finding still needs experimental verification. No page numbers are available in our copy. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

PLTP induces the secretion of ApoE from astrocytes.

“and induces the secretion of ApoE from astrocytes (57, 89).”

• cites [57] Vuletic, 2005, Reduced CSF PLTP activity in Alzheimer's disease and other neurologic diseases; PLTP induces ApoE secretion in primary human astrocytes in vitro, J. Neurosci. Res. sourceNot checked — no full text of the source
• cites [89] Demeester, 2000, Characterization and functional studies of lipoproteins, lipid transfer proteins, and lecithin:cholesterol acyltransferase in CSF of normal individuals and patients with Alzheimer's disease, J. Lipid Res. sourceCould not verify

  The section on lipid transfer proteins reports PLTP activity in CSF, while the discussion of astrocytes addresses ApoE synthesis and cholesterol efflux. Neither passage says that PLTP induces ApoE secretion from astrocytes; the paper says that the form in which astrocytes secrete ApoE has not been elucidated. Searched for PLTP-induced ApoE secretion and the relationship between phospholipid transfer protein and astrocytes. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Secretion of Serpina3n on astrocyte ApoE lipoprotein may prevent extracellular matrix degradation.

“suggesting that secretion of Serpina3n on astrocyte ApoE lipoprotein may prevent extracellular matrix degradation (92).”

• cites [92] Ang, 2011, Serpina3n attenuates granzyme B-mediated decorin cleavage and rupture in a murine model of aortic aneurysm, Cell Death Dis sourcePartly supported

  The Abstract and Discussion report that Serpina3n inhibits granzyme B-mediated cleavage of decorin, an extracellular-matrix proteoglycan, in a murine aortic-aneurysm model. They do not establish that Serpina3n is secreted on astrocyte ApoE lipoproteins or that this mechanism operates in astrocytes; the paper’s ApoE-KO mice are not evidence of lipoprotein carriage. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

• AssumptionRests on an assumption: Serpina3n is secreted on astrocyte ApoE lipoprotein.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Treatment with an LXR agonist was protective in a mouse model of tau-mediated neurodegeneration.

“Previous research has shown that the overexpression of ABCA1 ameliorated Aβ pathology in a mouse model of Aβ amyloidosis and that treatment with an LXR agonist was protective in a mouse model of tau-mediated neurodegeneration (65, 66).”

• cites [66] Wahrle, 2008, Overexpression of ABCA1 reduces amyloid deposition in the PDAPP mouse model of Alzheimer disease, J. Clin. Invest. sourceCould not verify

  The Discussion reports that LXR agonists affect Aβ levels, but does not address whether they protect against tau-mediated neurodegeneration. The Introduction and Abstract support the separate ABCA1-overexpression clause in the citing sentence; they do not verify the quoted LXR-treatment claim. Searched the indexed copy for tau-mediated neurodegeneration and LXR agonist treatment. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

In the context of neurodegeneration, microglia strongly upregulate ApoE expression.

“In the context of neurodegeneration, microglia strongly upregulate ApoE expression (4, 11).”

• cites [4] Keren-Shaul, 2017, A unique microglia type associated with restricting development of Alzheimer's Disease, Cell sourceSupported
• cites [11] Krasemann, 2017, The TREM2-APOE pathway drives the transcriptional phenotype of dysfunctional microglia in neurodegenerative diseases, Immunity sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoE isoform alters cell metabolism in human iPSC-derived astrocytes.

“ApoE isoform has also been reported to alter cell metabolism in human iPSC-derived astrocytes (16).”

• cites [16] Tcw, 2022, Cholesterol and matrisome pathways dysregulated in astrocytes and microglia, Cell sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoE2 leads to less uptake of CEs by neurons.

“as it leads to less uptake of CEs, which can be neurotoxic in excess, by neurons (96).”

• cites [96] Guo, 2025, Decreased lipidated ApoE-receptor interactions confer protection against pathogenicity of ApoE and its lipid cargoes in lysosomes, Cell sourcePartly supported

  The Results section on lipid uptake reports less CE uptake with ApoE2 than with ApoE3 or ApoE4 in H4 cells and iAstrocytes, not neurons. The Discussion proposes decreased delivery of pathogenic lipids into neurons as an ApoE2 protective mechanism, and the neuronal experiments show less lipofuscin after CE-carrying ApoE2 treatment. Thus, the neuronal CE-uptake claim is plausible but is stated more definitively than the source establishes. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The ApoE4 isoform drives disruption of the tricarboxylic acid cycle and lipid metabolism in microglia.

“The ApoE4 isoform has also been reported to drive disruption of the tricarboxylic acid cycle and lipid metabolism in microglia (68).”

• cites [68] Lee, 2023, APOE modulates microglial immunometabolism in response to age, amyloid pathology, and inflammatory challenge, Cell Rep sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Trypanosome lytic factor is a complex consisting of ApoA1, haptoglobin-related protein (Hrp), and apolipoprotein L1 (ApoL1).

“A particularly interesting example is trypanosome lytic factor (70, 71, 72), which is a complex consisting of ApoA1, haptoglobin-related protein (Hrp), and apolipoprotein L1 (ApoL1) (72).”

• cites [70] Pays, 2006, The trypanolytic factor of human serum, Nat. Rev. Microbiol. sourceNot checked — no full text of the source
• cites [71] Molina-Portela, 2008, Distinct roles of apolipoprotein components within the trypanosome lytic factor complex revealed in a novel transgenic mouse model, J. Exp. Med. sourceSupported
• cites [72] Samanovic, 2009, Trypanosome lytic factor, an antimicrobial high-density lipoprotein, ameliorates Leishmania infection, Plos Pathog. sourcePartly supported

  The Introduction identifies ApoA-I, Hpr, and ApoL-I as the predominant components of TLF1. It also identifies TLF2 as containing those three proteins plus IgM, so the three-component description does not fully describe both forms of trypanosome lytic factor. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim.

ApoE forms a complex with C1qa and C1qb.

“ApoE has been previously reported to form a complex with C1qa and C1qb (82, 83)”

• cites [82] Yin, 2019, ApoE attenuates unresolvable inflammation by complex formation with activated C1q, Nat. Med. sourcePartly supported

  The Results section (page not specified) confirms that ApoE forms a complex with activated C1q. The cited passages do not establish complex formation specifically with the C1qa and C1qb subunits. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [83] Habenicht, 2022, The C1q-ApoE complex: a new hallmark pathology of viral hepatitis and nonalcoholic fatty liver disease, Front Immunol. sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Aβ bound to ApoE aggregates in the endolysosomal pathway.

“where both molecules aggregate in the endolysosomal pathway (12).”

• cites [12] Kaji, 2024, Apolipoprotein E aggregation in microglia initiates Alzheimer’s disease pathology by seeding β-amyloidosis, Immunity sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

In the CNS, ApoE is initially secreted as a discoidal particle similar in size to HDL in plasma.

“In the CNS, ApoE is initially secreted as a discoidal particle that is similar in size to HDL in plasma (1, 2, 49).”

• cites [1] Fagan, 1999, Unique lipoproteins secreted by primary astrocytes from wild type, apoE (-/-), and human apoE transgenic mice, J. Biol. Chem. sourcePartly supported

  The Results report that cultured mouse astrocytes secrete apoE-containing particles similar in size to plasma HDL, and that the nascent particles are likely predominantly discoidal. The claim presents that tentative finding as an established description of initial apoE secretion throughout the CNS, beyond the cultured astrocytes studied. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [2] LaDu, 1998, Nascent astrocyte particles differ from lipoproteins in CSF, J. Neurochem. sourceNot checked — no full text of the source
• cites [49] Strickland, 2024, Apolipoprotein E secreted by astrocytes forms antiparallel dimers in discoidal lipoproteins, Neuron sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

In plasma, ApoA1 is the main protein component of HDL and associates with a wide range of proteins that alter its function and metabolism.

“In plasma, ApoA1 is the main protein component of HDL and is known to associate with a wide range of proteins that alter its function and metabolism (51, 69).”

• cites [51] Davidson, 2022, The HDL proteome watch: compilation of studies leads to new insights on HDL function, Biochim. Biophys. Acta Mol. Cell Biol Lipids sourcePartly supported

  The Introduction identifies APOA1 as a dominant HDL protein and describes many other proteins in human HDL. The Lipid transport section says APOA1 is a structural scaffold on almost all HDL particles and interacts with lipid-remodeling factors. The paper describes effects of other proteins on HDL function and particle clearance, but these passages do not establish that a wide range of proteins alter APOA1’s own function and metabolism. (LLM, conf=0.82)

  Experimental — accuracy not yet measured
• cites [69] Han, 2021, Enterically derived high-density lipoprotein restrains liver injury through the portal vein, Science sourcePartly supported

  The Results section on portal HDL3 (page unavailable) reports many accessory proteins in plasma HDL, and the Discussion links LBP-containing HDL3 to an anti-inflammatory function. Our copy does not establish that ApoA1 itself directly associates with that wide range of proteins, that those proteins alter its metabolism, or that ApoA1 is HDL’s main protein component. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoE2 has been reported to be neuroprotective.

“has been reported to be neuroprotective”

• cites [96] Guo, 2025, Decreased lipidated ApoE-receptor interactions confer protection against pathogenicity of ApoE and its lipid cargoes in lysosomes, Cell sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Ltf has an antimicrobial function.

“Ltf is known to have an antimicrobial function, suggesting that ApoE secreted by microglia could be induced by microbial infection (74).”

• cites [74] Sanchez, 1992, Biological role of lactoferrin, Arch. Dis. Child sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Astrocytes account for the bulk of ApoE secretion under homeostatic conditions.

“Astrocytes account for the bulk of ApoE secretion under homeostatic conditions (14).”

• cites [14] Mahan, 2022, Selective reduction of astrocyte apoE3 and apoE4 strongly reduces abeta accumulation and plaque-related pathology in a mouse model of amyloidosis, Mol. Neurodegener. sourceSupported

Probably not a substantial claim. The paper’s conclusions may not depend on it.

PLTP has reduced activity in the context of AD.

“PLTP, which has been reported to have reduced activity in the context of AD”

• cites [57] Vuletic, 2005, Reduced CSF PLTP activity in Alzheimer's disease and other neurologic diseases; PLTP induces ApoE secretion in primary human astrocytes in vitro, J. Neurosci. Res. sourceNot checked — no full text of the source
• cites [89] Demeester, 2000, Characterization and functional studies of lipoproteins, lipid transfer proteins, and lecithin:cholesterol acyltransferase in CSF of normal individuals and patients with Alzheimer's disease, J. Lipid Res. sourceCould not verify

  The Activity measurements section reports PLTP activity in CSF but does not compare PLTP activity between AD patients and controls; Table 4 gives only a combined mean. The AD-associated reduction reported in that section and in Lipid transfer proteins and LCAT in human CSF concerns LCAT, not PLTP. Our copy therefore does not establish reduced PLTP activity in AD. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

LPS-binding protein can transfer LPS to CD14 to initiate inflammatory Toll-like receptor 4/myeloid differentiation factor 2 signaling.

“LPS-binding protein, which can transfer LPS to CD14 to initiate inflammatory Toll-like receptor 4/myeloid differentiation factor 2 signaling”

• cites [69] Han, 2021, Enterically derived high-density lipoprotein restrains liver injury through the portal vein, Science sourceSupported
• cites [99] Wurfel, 1994, Lipopolysaccharide (Lps)-Binding protein is carried on lipoproteins and acts as a cofactor in the neutralization of Lps, J. Exp. Med. sourcePartly supported

  The Introduction says LBP facilitates LPS binding to CD14, which then initiates cellular responses; the Summary also describes LBP as transferring LPS to CD14. Neither passage identifies Toll-like receptor 4 or myeloid differentiation factor 2 as the signaling pathway, so that part is not supported by this paper. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [100] Shao, 2012, Hepatic uptake and deacylation of the LPS in bloodborne LPS-lipoprotein complexes, Innate Immun. sourcePartly supported

  The Introduction (page unavailable) says LPS-binding protein largely mediates LPS binding to lipoproteins. It does not say that the protein transfers LPS to CD14 or thereby initiates inflammatory TLR4/MD2 signaling; the References mention CD14/TLR4/MD2 only in connection with LPS uptake by hepatocytes. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Probably not a substantial claim. The paper’s conclusions may not depend on it.

LPS-binding protein becomes anti-inflammatory when associated with ApoA1-containing HDL.

“becomes anti-inflammatory when associated with ApoA1-containing HDL (69, 99, 100).”

• cites [69] Han, 2021, Enterically derived high-density lipoprotein restrains liver injury through the portal vein, Science sourceSupported
• cites [99] Wurfel, 1994, Lipopolysaccharide (Lps)-Binding protein is carried on lipoproteins and acts as a cofactor in the neutralization of Lps, J. Exp. Med. sourcePartly supported

  The Discussion reports that LBP associates with apoA-I-containing lipoproteins and helps them neutralize LPS. But it also says these particles can enable LPS-mediated responses, and that association may modulate which of LBP’s two activities predominates. The categorical claim that LBP becomes anti-inflammatory when associated with HDL overstates the finding; page numbers are not supplied for these passages. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [100] Shao, 2012, Hepatic uptake and deacylation of the LPS in bloodborne LPS-lipoprotein complexes, Innate Immun. sourcePartly supported

  The Introduction (page unavailable) says LPS-binding protein helps mediate LPS binding to lipoproteins and that lipoprotein-bound LPS is less able to stimulate cells. The Methods (page unavailable) report reduced macrophage IL-6 production from LPS-HDL complexes. Neither passage says LPS-binding protein itself becomes anti-inflammatory when associated with ApoA1-containing HDL. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

It may state two separate claims as one.

ApoE4 lipoprotein has slightly higher levels of total cholesterol and free cholesterol than ApoE2 and ApoE3, but the differences are not statistically significant.

“ApoE4 lipoprotein appeared to have slightly higher levels of total cholesterol and FC than ApoE2 and ApoE3; however, these changes are not statistically significant (Fig. 2D, E, Supplemental Table S4).”

It may state two separate claims as one.

The astrocyte and microglia ApoE lipoprotein proteomes are most similar to each other, followed by the HDL proteome watch, then the brain lipoprotein proteome watch, and lastly the AD-associated CSF proteome.

“The astrocyte and microglia ApoE lipoprotein proteome were most similar, followed by the HDL proteome watch, then the brain lipoprotein proteome watch, and lastly the AD-associated CSF proteome (Supplemental Fig. S2C).”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

1,302 proteins were detected in astrocyte- and microglia-secreted ApoE lipoproteins before filtering.

“Before filtering proteins, 1,302 proteins were detected in astrocyte- and microglia-secreted ApoE lipoproteins.”

It may state two separate claims as one.

PCA of the lipidome shows partial separation of samples based on cellular source but not by ApoE isoform.

“PCA of the lipidome of ApoE lipoproteins shows partial separation of samples based on the cellular source of the ApoE lipoprotein but not by ApoE isoform.”

It may state two separate claims as one.

PCA of the lipidomics samples showed partial separation of the samples by cell type but not by ApoE isoform.

“Principal component analysis (PCA) of the lipidomics samples showed partial separation of the samples by cell type but not by ApoE isoform (Fig. 2B).”

It may state two separate claims as one.

Lpl, enriched in microglia ApoE lipoprotein, is also found in the HDL proteome watch and AD-associated CSF proteome.

“Lpl, which is enriched in the microglia ApoE lipoprotein, is also found in the HDL proteome watch and AD-associated CSF proteome (Supplemental Table S12).”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Under inflammatory conditions, astrocytes can secrete ApoE-carrying neurotoxic lipids that directly cause neuronal death.

“Under inflammatory conditions, astrocytes can secrete ApoE-carrying neurotoxic lipids that directly cause neuronal death (20).”

• cites [20] Guttenplan, 2021, Neurotoxic reactive astrocytes induce cell death via saturated lipids, Nature sourceNot checked yet

Probably not a substantial claim. The paper’s conclusions may not depend on it.

APOE4 expressed in iPSC-derived astrocytes leads to increased accumulation of unsaturated fatty acids and lipid droplet formation.

“Another report found that APOE4 expressed in iPSC-derived astrocytes led to increased accumulation of unsaturated fatty acids and lipid droplet formation (17).”

• cites [17] Sienski, 2021, APOE4 disrupts intracellular lipid homeostasis in human iPSC-derived glia, Sci. Transl. Med. sourceNot checked yet

Probably not a substantial claim.

ApoE4 alters the lipid metabolism of human iPSC-derived astrocytes and microglia.

“ApoE4 has also been reported to alter the lipid metabolism of human-induced pluripotent stem cell (iPSC)-derived astrocytes and microglia (16).”

• cites [16] Tcw, 2022, Cholesterol and matrisome pathways dysregulated in astrocytes and microglia, Cell sourceNot checked yet

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Sex was not considered as a biological factor due to pooling of multiple pups to generate mixed glia cultures.

“Due to pooling of multiple pups to generate mixed glia cultures, sex was not considered as a biological factor.”

Probably not a substantial claim.

Common contaminants (i.e., keratins and IgG fragments) were manually excluded.

“Additionally, common contaminants (i.e., keratins and IgG fragments) were manually excluded (Supplemental Table S5).”

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

ApoC1 is expressed by astrocytes and microglia and modulates the immune response.

“ApoC1 is known to be expressed by astrocytes and microglia and to modulate the immune response (56).”

• cites [56] Cudaback, 2012, Apolipoprotein C-I is an APOE genotype-dependent suppressor of glial activation, J. Neuroinflammation sourceNot checked yet

Probably not a substantial claim.

Contaminants resulting from previous exposure to serum-containing media were filtered by removing bovine-specific peptides as well as peptides shared between bovine and mouse.

“Contaminants resulting from previous exposure to serum-containing media were filtered by removing bovine-specific peptides as well as peptides shared between bovine and mouse.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Pltp induces secretion of ApoE from astrocytes.

“Pltp was also enriched in astrocyte ApoE lipoproteins (Fig. 5B, Supplemental Table S8) and has been previously reported to induce secretion of ApoE from astrocytes (57).”

• cites [57] Vuletic, 2005, Reduced CSF PLTP activity in Alzheimer's disease and other neurologic diseases; PLTP induces ApoE secretion in primary human astrocytes in vitro, J. Neurosci. Res. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Clu cooperatively suppresses Aβ plaque deposition in mouse models of Aβ amyloidosis.

“Clu also cooperatively suppresses Aβ plaque deposition in mouse models of Aβ amyloidosis (55).”

• cites [55] DeMattos, 2004, ApoE and clusterin cooperatively suppress Abeta levels and deposition: evidence that ApoE regulates extracellular Abeta metabolism in vivo, Neuron sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim.

Only proteins differentially abundant compared to ApoE−/− conditioned media controls were considered as present.

“To remove other contaminants, only proteins differentially abundant compared to ApoE−/− conditioned media controls were considered as present.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Pla2g7 is associated with AD.

“Pla2g7 was increased in astrocyte ApoE lipoproteins (Fig. 5B, Supplemental Table S8) and is associated with AD (62).”

• cites [62] Koshy, 2010, Genetic deficiency of plasma lipoprotein-associated phospholipase A2 (PLA2G7 V297F null mutation) and risk of Alzheimer's disease in Japan, J. Alzheimers Dis. sourceNot checked — no full text of the source

Probably not a substantial claim.

Proteins with an abundance less than the mean plus 0.5 standard deviations were excluded from analysis.

“To exclude proteins with minimal abundance, all proteins with an abundance less than the mean plus 0.5 standard deviations were excluded from analysis (Supplemental Table S5).”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Pltp is present in ApoE lipoprotein.

“Pltp is known to be present in ApoE lipoprotein, and Pltp activity is reduced in AD patients compared to controls (57).”

• cites [57] Vuletic, 2005, Reduced CSF PLTP activity in Alzheimer's disease and other neurologic diseases; PLTP induces ApoE secretion in primary human astrocytes in vitro, J. Neurosci. Res. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Mutations in Mlip are associated with myopathy and may play a role in myoblast differentiation.

“Mutations in Mlip have been associated with myopathy, with reports suggesting that it could play a role in myoblast differentiation (58).”

• cites [58] Al Amrani, 2023, MLIP-Associated myopathy: a case report and review of the literature, J. Neuromuscul. Dis. sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

All animal procedures and experiments were performed under guidelines approved by the Institutional Animal Care and Use Committee at Washington University School of Medicine.

“All animal procedures and experiments were performed under guidelines approved by the Institutional Animal Care and Use Committee at Washington University School of Medicine.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Pltp activity is reduced in AD patients compared to controls.

“Pltp is known to be present in ApoE lipoprotein, and Pltp activity is reduced in AD patients compared to controls (57).”

• cites [57] Vuletic, 2005, Reduced CSF PLTP activity in Alzheimer's disease and other neurologic diseases; PLTP induces ApoE secretion in primary human astrocytes in vitro, J. Neurosci. Res. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The proteins found with ApoE lipoproteins may regulate lipoprotein trafficking and function.

“Although ApoE is the primary constituent of ApoE lipoproteins secreted by astrocytes and microglia, the proteins found with ApoE lipoproteins may regulate lipoprotein trafficking and function.”

It may state two separate claims as one.

The lipidome and proteome of ApoE lipoprotein are altered based on cellular source and ApoE isoform, with cellular source being the primary determinant.

“In this study, we found that the lipidome and proteome of ApoE lipoprotein are altered based on the cellular source and ApoE isoform, with the cellular source of ApoE being the primary determinant.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoA1 acts as a scaffold protein, organizing the lipoprotein complex to carry Hrp and ApoL1.

“ApoA1 acts as a scaffold protein, organizing this lipoprotein complex to carry Hrp and ApoL1.”

• cites [72] Samanovic, 2009, Trypanosome lytic factor, an antimicrobial high-density lipoprotein, ameliorates Leishmania infection, Plos Pathog. sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Ankk1 is a Ser/Thr protein kinase most closely associated with dopamine receptor D2.

“Ankyrin repeat and kinase domain-containing 1 (Ankk1) is a Ser/Thr protein kinase most closely associated with dopamine receptor D2 (80).”

• cites [80] Neville, 2004, Identification and characterization of ANKK1: a novel kinase gene closely linked to DRD2 on chromosome band 11q23.1, Hum. Mutat. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Reduced membrane fluidity could impact the conformation of ApoE and other proteins on the ApoE lipoprotein.

“which could impact the conformation of ApoE and other proteins on the ApoE lipoprotein.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Lpl may alter the binding of ApoE lipoproteins to their receptors.

“Lpl may also alter the binding of ApoE lipoproteins to their receptors”

Probably not a substantial claim. The authors may not put it forward as true. The paper’s conclusions may not depend on it.

There are differences in lipolysis of lipids contained in microglia-secreted ApoE compared to lipids in astrocyte-secreted ApoE.

“The enrichment of Lpl with microglia ApoE lipoprotein could suggest differences in lipolysis of lipids contained in microglia-secreted ApoE compared to lipids in astrocyte-secreted ApoE.”

• AssumptionRests on an assumption: Lpl functions in the lipolysis of lipids in ApoE lipoproteins.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

C1q bound to ApoE may prevent interaction with Trem2.

“potentially suggesting that C1q bound to ApoE may prevent interaction with Trem2 (85).”

• cites [85] Greven, 2025, Biophysical mapping of TREM2-ligand interactions reveals shared surfaces for engagement of multiple Alzheimer's disease ligands, Mol. Neurodegener sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Mfge8 can bind phosphatidylserine and is secreted as an "eat-me" signaling molecule.

“Mfge8 can bind phosphatidylserine and has been reported to be secreted as an “eat-me” signaling molecule (78).”

• cites [78] Aguzzi, 2014, Follicular dendritic cells: origin, phenotype, and function in health and disease, Trends Immunol. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Mutations in Lp-PLA2 are associated with increased risk for cardiovascular disease.

“and cardiovascular disease (90, 91).”

• cites [90] Gungor, 2012, Apo E4 and lipoprotein-associated phospholipase A2 synergistically increase cardiovascular risk, Atherosclerosis sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

• cites [91] Grallert, 2012, Eight genetic loci associated with variation in lipoprotein-associated phospholipase A2 mass and activity and coronary heart disease: meta-analysis of genome-wide association studies from five community-based studies, Eur. Heart J. sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

CSF levels of C1q correlate with AD.

“Previous reports show a correlation between CSF levels of C1q and AD (84).”

• cites [84] Lin, 2025, The associations of cerebrospinal fluid ApoE and C1q with Alzheimer's disease biomarkers, J. Alzheimers Dis. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

Hrp binds to receptors on trypanosomes, causing internalization of the complex, whereafter ApoL1 can form a pore in the plasma membrane of the trypanosome, causing cell lysis.

“Hrp binds to receptors on trypanosomes, causing the internalization of the complex, whereafter ApoL1 can form a pore in the plasma membrane of the trypanosome, causing cell lysis.”

• cites [72] Samanovic, 2009, Trypanosome lytic factor, an antimicrobial high-density lipoprotein, ameliorates Leishmania infection, Plos Pathog. sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoE has significantly less affinity for LCAT than ApoA1.

“ApoE has also been reported to have significantly less affinity for LCAT than ApoA1”

• cites [94] Rye, 2006, Regulation of reconstituted high density lipoprotein structure and remodeling by apolipoprotein E, J. Lipid Res. sourceNot checked yet

It may state two separate claims as one.

Mfge8 could be involved in promoting antimicrobial activity and clearance of cell debris.

“Mfge8, which is enriched in microglial lipoproteins, could also be involved in promoting antimicrobial activity and clearance of cell debris due to the role of Mfge8 in promoting phagocytosis (75).”

• cites [75] Collins, 1997, Mapping of a newly discovered human gene homologous to the apoptosis associated-murine mammary protein, MFG-E8, to chromosome 15q25, Genomics sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Mfge8 coaggregates with vascular Aβ plaques, cerebral amyloid angiopathy, in AD.

“Mfge8 has also been found to coaggregate with vascular Aβ plaques, cerebral amyloid angiopathy, in AD (77).”

• cites [77] Wagner, 2022, Medin co-aggregates with vascular amyloid-beta in Alzheimer's disease, Nature sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Mutations in Lp-PLA2 are associated with increased risk for AD.

“Mutations in Lp-PLA2 have been associated with increased risk for AD (62)”

• cites [62] Koshy, 2010, Genetic deficiency of plasma lipoprotein-associated phospholipase A2 (PLA2G7 V297F null mutation) and risk of Alzheimer's disease in Japan, J. Alzheimers Dis. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Mutations in Ankk1 are related to reductions in autoantibodies against Aβ in AD.

“Mutations in Ankk1 have been related to reductions in autoantibodies against Aβ in AD, suggesting a possible link between Ankk1 and ApoE in the pathogenesis of AD (81).”

• cites [81] Qu, 2014, Beta-amyloid auto-antibodies are reduced in Alzheimer's disease, J. Neuroimmunol sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The lack of significant enrichment of LCAT may reflect lack of substrates for LCAT due to serum-free culture conditions.

“This result may reflect the lack of substrates for LCAT due to the cells being cultured in serum-free conditions.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Reduced PLTP activity has been reported in the CSF of multiple sclerosis patients.

“Reduced PLTP activity has also been reported in the CSF of multiple sclerosis patients (57).”

• cites [57] Vuletic, 2005, Reduced CSF PLTP activity in Alzheimer's disease and other neurologic diseases; PLTP induces ApoE secretion in primary human astrocytes in vitro, J. Neurosci. Res. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

C1q and ApoE compete for binding to Trem2.

“C1q and ApoE have been shown to compete for binding to Trem2”

• cites [85] Greven, 2025, Biophysical mapping of TREM2-ligand interactions reveals shared surfaces for engagement of multiple Alzheimer's disease ligands, Mol. Neurodegener sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The elution methods may have caused dissociation of LCAT from the ApoE lipoprotein.

“Alternatively, the elution methods used to dissociate ApoE from the immunoaffinity column may have also caused dissociation of LCAT from the ApoE lipoprotein.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Astrocytes under inflammatory conditions secrete ApoE lipoproteins containing long-chain fatty acids that are neurotoxic in culture.

“Previous research has shown that astrocytes under inflammatory conditions secrete ApoE lipoproteins containing long-chain fatty acids that are neurotoxic in culture (20).”

• cites [20] Guttenplan, 2021, Neurotoxic reactive astrocytes induce cell death via saturated lipids, Nature sourceNot checked yet

Probably not a substantial claim. The paper’s conclusions may not depend on it.

LCAT may be easily dissociated from ApoE lipoprotein.

“suggesting that it may be easily dissociated from ApoE lipoprotein (94).”

• cites [94] Rye, 2006, Regulation of reconstituted high density lipoprotein structure and remodeling by apolipoprotein E, J. Lipid Res. sourceNot checked yet

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Mfge8 functions as a cell adhesion protein connecting smooth muscle to elastic fibers.

“Mfge8 is one of the most enriched proteins in microglia ApoE lipoproteins compared to astrocyte lipoproteins (Fig. 5B) and is thought to function as a cell adhesion protein connecting smooth muscle to elastic fibers (75, 76).”

• cites [75] Collins, 1997, Mapping of a newly discovered human gene homologous to the apoptosis associated-murine mammary protein, MFG-E8, to chromosome 15q25, Genomics sourceNot checked — no full text of the source
• cites [76] Larsson, 2006, Lactadherin binds to elastin--a starting point for medin amyloid formation?, Amyloid sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

The lipolysis of lipids in VLDL-containing ApoE4 results in increased particle fluidity and an expansion of ApoE4 conformation.

“the lipolysis of lipids in VLDL-containing ApoE4 results in increased particle fluidity and an expansion of ApoE4 conformation (95).”

• cites [95] Tetali, 2010, VLDL lipolysis products increase VLDL fluidity and convert apolipoprotein E4 into a more expanded conformation, J. Lipid Res. sourceNot checked yet

  Checked before — its earlier verdict is held back until a new check runs.

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoE2 is unable to bind LDLR.

“ApoE2, due to its inability to bind LDLR”

• cites [96] Guo, 2025, Decreased lipidated ApoE-receptor interactions confer protection against pathogenicity of ApoE and its lipid cargoes in lysosomes, Cell sourceNot checked yet

It may state two separate claims as one.

The results reinforce the validity of the previous results and the cell specificity of the proteins secreted on ApoE lipoproteins from these various cell types.

“Together, these results reinforce the validity of our previous results and the cell specificity of the proteins secreted on ApoE lipoproteins from these various cell types.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Lpl mediates the binding of lipoproteins to LRP1.

“Lpl has been previously reported to mediate the binding of lipoproteins to LRP1 (86, 87, 88).”

• cites [86] Nykjaer, 1994, A carboxyl-terminal fragment of lipoprotein lipase binds to the low density lipoprotein receptor-related protein and inhibits lipase-mediated uptake of lipoprotein in cells, J. Biol. Chem. sourceNot checked — no full text of the source
• cites [87] Chappell, 1992, The low density lipoprotein receptor-related protein/alpha 2-macroglobulin receptor binds and mediates catabolism of bovine milk lipoprotein lipase, J. Biol. Chem. sourceNot checked — no full text of the source
• cites [88] Williams, 1994, The carboxyl-terminal domain of lipoprotein lipase binds to the low density lipoprotein receptor-related protein/alpha 2-macroglobulin receptor (LRP) and mediates binding of normal very low density lipoproteins to LRP, J. Biol. Chem. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

ApoE secreted by microglia could be induced by microbial infection.

“Ltf is known to have an antimicrobial function, suggesting that ApoE secreted by microglia could be induced by microbial infection (74).”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

LCAT is produced by astrocytes.

“previous reports reporting that LCAT is produced by astrocytes (93).”

• cites [93] Hirsch-Reinshagen, 2009, LCAT synthesized by primary astrocytes esterifies cholesterol on glia-derived lipoproteins, J. Lipid Res. sourceNot checked yet

Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.

Many of the described proteins are also relevant for cardiovascular disease.

“many of the described proteins are also relevant for cardiovascular disease”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Species differences are an important consideration in interpreting these results.

“Considering the differences of mice and men, species differences also are an important consideration in interpreting these results.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Human CSF ApoE lipoproteins are spherical.

“This results in spherical ApoE lipoprotein isolated from human CSF”

• cites [2] LaDu, 1998, Nascent astrocyte particles differ from lipoproteins in CSF, J. Neurochem. sourceNot checked — no full text of the source
• cites [98] Pitas, 1987, Lipoproteins and their receptors in the central nervous system. Characterization of the lipoproteins in cerebrospinal fluid and identification of apolipoprotein B,E(LDL) receptors in the brain, J. Biol. Chem. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

We took steps to mitigate the influence of serum on ApoE lipoprotein composition by switching cultures to serum-free media and excluding bovine-specific peptides.

“Although we took steps to mitigate the influence of serum on ApoE lipoprotein composition by switching cultures to serum-free media and excluding bovine-specific peptides”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The study does not distinguish whether these proteins are incorporated into the particle during the secretion pathway or become associated following secretion by the cell.

“but does not distinguish whether these proteins are incorporated into the particle during the secretion pathway or become associated following secretion by the cell.”

Probably not a substantial claim. The paper’s conclusions may not depend on it.

Mouse ApoE lipoproteins are discoidal.

“whereas mouse ApoE lipoproteins are discoidal (2, 98).”

• cites [2] LaDu, 1998, Nascent astrocyte particles differ from lipoproteins in CSF, J. Neurochem. sourceNot checked — no full text of the source
• cites [98] Pitas, 1987, Lipoproteins and their receptors in the central nervous system. Characterization of the lipoproteins in cerebrospinal fluid and identification of apolipoprotein B,E(LDL) receptors in the brain, J. Biol. Chem. sourceNot checked — no full text of the source

Probably not a substantial claim. The paper’s conclusions may not depend on it.

The elution method may result in disruption of proteins loosely bound to ApoE lipoprotein.

“However, this may result in disruption of proteins loosely bound to ApoE lipoprotein.”