Cited by 321Alzheimer's disease research and treatmentsMitochondrial Function and PathologyDementia and Cognitive Impairment Research

Lipid- and receptor-binding regions of apolipoprotein E4 fragments act in concert to cause mitochondrial dysfunction and neurotoxicity

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Chang, Shengjun, Ma, Tian ran, Miranda, R. Dennis, Balestra, Maureen E., Mahley, Robert W., Huang, Yadong·2005·Proceedings of the National Academy of Sciences

Abstract

Apolipoprotein (apo) E4, a 299-aa protein and a major risk factor for Alzheimer's disease, can be cleaved to generate C-terminal-truncated fragments that cause neurotoxicity in vitro and neurodegeneration and behavioral deficits in transgenic mice. To investigate this neurotoxicity, we expressed apoE4 with C- or N-terminal truncations or mutations in transfected Neuro-2a cells. ApoE4 (1-272) was neurotoxic, but full-length apoE4(1-299) and apoE4(1-240) were not, suggesting that the lipid-binding region (amino acids 241-272) mediates the neurotoxicity and that amino acids 273-299 are protective. A quadruple mutation in the lipid-binding region (I250A, F257A, W264R, and V269A) abolished the neurotoxicity of apoE4(1-272), and single mutations in the region of amino acids 273-299 (L279Q, K282A, or Q284A) made full-length apoE4 neurotoxic. Immunofluorescence staining showed that apoE4(1-272) formed filamentous inclusions containing phosphorylated tau in some cells and interacted with mitochondria in others, leading to mitochondrial dysfunction as determined by MitoTracker staining and flow cytometry. ApoE4(241-272) did not cause mitochondrial dysfunction or neurotoxicity, suggesting that the lipid-binding region alone is insufficient for neurotoxicity. Truncation of N-terminal sequences (amino acids 1-170) containing the receptor-binding region (amino acids 135-150) and triple mutations within that region (R142A, K146A, and R147A) abolished the mitochondrial interaction and neurotoxicity of apoE4(1-272). Further analysis showed that the receptor-binding region is required for escape from the secretory pathway and that the lipid-binding region mediates mitochondrial interaction. Thus, the lipid- and receptor-binding regions in apoE4 fragments act together to cause mitochondrial dysfunction and neurotoxicity, which may be important in Alzheimer's disease pathogenesis.

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  • APOE4 increases the sensitivity of cells to oxidative stress.

    “APOE4 increases the sensitivity of cells to oxidative stress”

    From APOE4 genotype exacerbates the depression-like behavior of mice during aging through ATP decline (2021) · cites this paper as [13]

    The Abstract lists impairment of the antioxidative defense system among proposed apoE4-related mechanisms, which is consistent with greater vulnerability to oxidative stress. But the paper does not report a test showing that APOE4 increases cells’ sensitivity to oxidative stress; its cell experiments assess neurotoxicity and mitochondrial function, not responses to an oxidative challenge. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • APOE4 expression generates a toxic C-terminal fragment of apoE4 that can directly target electron transport chain (ETC) complexes in mitochondria.

    “the generation of a toxic C-terminal fragment of apoE4 that can directly target electron transport chain (ETC) complexes in the mitochondria25–27”

    From APOE4 is Associated with Differential Regional Vulnerability to Bioenergetic Deficits in Aged APOE Mice (2020) · cites this paper as [25]

    The Results report that apoE4(1-272) fragments localize to mitochondria in Neuro-2a cells and impair mitochondrial function, as measured by MitoTracker fluorescence (Figs. 2 and 5). They do not show direct targeting of electron transport chain complexes. The paper describes the toxic fragment as C-terminal-truncated apoE4, not an isolated C-terminal fragment. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • ApoE4 is associated with aggravated Alzheimer's disease neuropathology, enhanced neuroinflammation, deregulated lipid metabolism, mitochondrial dysfunction, and impaired synaptic plasticity.

    “On the molecular level, ApoE4 has been associated with aggravated AD neuropathology, enhanced neuroinflammation, deregulated lipid metabolism, mitochondrial dysfunction, and impaired synaptic plasticity (Nagy et al., 1995;Chang et al., 2005;Rapp et al., 2006;Klein et al., 2010;Rodriguez et al., 2014).”

    From Human ApoE Isoforms Differentially Modulate Brain Glucose and Ketone Body Metabolism: Implications for Alzheimer's Disease Risk Reduction and Early Intervention (2018) · cites this paper as Chang et al., 2005

    The Abstract links ApoE4 to AD risk and describes plaque formation and synaptic deficits among proposed mechanisms; the Results and Discussion report that ApoE4 fragments impair mitochondrial function. The paper does not establish enhanced neuroinflammation, deregulated lipid metabolism, or impaired synaptic plasticity specifically. The indexed passages do not provide page numbers. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Expression of apoE4 fragments containing the lipid-binding domain in N2a cells results in neurotoxicity.

    “expression of fragments containing this domain in N2a cells results in neurotoxicity [17]”

    From Neuronal Apolipoprotein E4 Expression Results in Proteome-Wide Alterations and Compromises Bioenergetic Capacity by Disrupting Mitochondrial Function (2019) · cites this paper as [17]

    The Results report that expressing apoE4(1–272), which contains the lipid-binding region, caused greater cell death in Neuro-2a cells. But the Results also state that the lipid-binding region alone caused no neurotoxicity: the receptor-binding region was required too. The claim omits that qualification. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The largest apoE4 fragment, apoE4(1-272), causes mitochondrial fragmentation.

    “and cause mitochondrial fragmentation [10, 17, 20]”

    From Neuronal Apolipoprotein E4 Expression Results in Proteome-Wide Alterations and Compromises Bioenergetic Capacity by Disrupting Mitochondrial Function (2019) · cites this paper as [17]

    The Results report that apoE4(1-272) interacted with mitochondria in Neuro-2a cells and reduced MitoTracker fluorescence, which the authors interpret as impaired mitochondrial function and integrity. They do not report mitochondrial fragmentation; the filamentous inclusions described in the Results concern the apoE4 fragment, not mitochondrial shape. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Sorted by citations

Authors
Chang, S., Ma, T. R., Miranda, R. D., Balestra, M. E., Mahley, R. W., & Huang, Y.
Affiliations
  • University of California, San Francisco (US)
  • Gladstone Institutes (US)
Venue
Proceedings of the National Academy of Sciences
Published
2005-12-12
Volume
102
Issue
51
Pages
18694-18699
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2022943683
Cited by
319
References
73
Citations by year
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FWCI
7.62
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • GlaxoSmithKline
  • National Institutes of Health (AG‐022074)
  • National Institute on Aging (P01AG022074)
  • National Heart, Lung, and Blood Institute (R01 HL37063, R01HL037063)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
APOE ε4, neurotoxicity, mitochondrial dysfunction, receptor-binding region, Alzheimer's disease, tau phosphorylation, N2a cells, transgenic mice
MeSH terms
Alzheimer Disease, Animals, Apolipoproteins E, Cytoskeleton, Lipids, Mitochondria, Mutation, Neurons, Peptide Fragments, Receptors, Lipoprotein, Cell Line, Tumor, Mice, Apolipoprotein E4

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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.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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