Cited by 829Alzheimer's disease research and treatmentsLipoproteins and Cardiovascular HealthCholesterol and Lipid Metabolism

Apolipoprotein E: Structure and function in lipid metabolism, neurobiology, and Alzheimer’s diseases

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Huang, Yadong, Mahley, Robert W.·2014·Neurobiology of Disease

Abstract

Apolipoprotein (apo) E is a multifunctional protein with central roles in lipid metabolism, neurobiology, and neurodegenerative diseases. It has three major isoforms (apoE2, apoE3, and apoE4) with different effects on lipid and neuronal homeostasis. A major function of apoE is to mediate the binding of lipoproteins or lipid complexes in the plasma or interstitial fluids to specific cell-surface receptors. These receptors internalize apoE-containing lipoprotein particles; thus, apoE participates in the distribution/redistribution of lipids among various tissues and cells of the body. In addition, intracellular apoE may modulate various cellular processes physiologically or pathophysiologically, including cytoskeletal assembly and stability, mitochondrial integrity and function, and dendritic morphology and function. Elucidation of the functional domains within this protein and of the three-dimensional structure of the major isoforms of apoE has contributed significantly to our understanding of its physiological and pathophysiological roles at a molecular level. It is likely that apoE, with its multiple cellular origins and multiple structural and biophysical properties, is involved widely in processes of lipid metabolism and neurobiology, possibly encompassing a variety of disorders of neuronal repair, remodeling, and degeneration by interacting with different factors through various pathways.

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Crossref · 10.1016/j.nbd.2014.08.025

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  • ApoE4 is excessively produced by damaged neurons.

    “elegant research from Mahley’s laboratory demonstrated in Neuro-2a neuronal cells expressing stable isoforms of apolipoprotein E (apoE), i.e., apoE2, apoE3, or apoE4, with the latter a major risk factor for developing AD, that apoE4 is excessively produced by damaged neurons [31].”

    From Mitochondrial Oxidative and Nitrosative Stress and Alzheimer Disease (2020) · cites this paper as [31]

    In “Synthesis of ApoE in Different Tissues and Cells” (page unavailable), the review reports that hippocampal and cortical neurons express apoE in response to injury. In “ApoE4 proteolysis and neurotoxicity” (page unavailable), it hypothesizes that injury enhances neuronal apoE expression, but does not establish that damaged neurons excessively produce apoE4 specifically. Its discussion of apoE-transfected Neuro-2a cells concerns neurite extension, not production by damaged neurons. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • In apoE4 neurons, mitochondrial respiration and glycolysis are negatively affected under basal conditions, and stressed or damaged apoE4 neurons have half the ATP reserve capacity of apoE3 neurons.

    “For the latter, mitochondrial respiration (as well as glycolysis) was negatively affected under basal conditions, but if stressed or damaged, apoE4 neurons had half the ATP reserve capacity of apoE3 neurons.”

    From Mitochondrial Oxidative and Nitrosative Stress and Alzheimer Disease (2020) · cites this paper as [31]

    The section “ApoE4 fragments disrupt cytoskeletal structure and impair mitochondrial function” (page unavailable) reports mitochondrial dysfunction in neurons and decreased cerebral glucose metabolism associated with apoE4. It does not establish impaired neuronal respiration and glycolysis under basal conditions or the claim that stressed apoE4 neurons have half the ATP reserve capacity of apoE3 neurons; searches for those terms found no supporting passage. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • In the periphery, ApoE has important implications in atherosclerosis and hyperlipoproteinemia, which also affect cerebral vasculature.

    “In the periphery, ApoE has important implications in atherosclerosis and hyperlipoproteinemia [3,23], which also affect cerebral vasculature.”

    From Apolipoprotein E metabolism and functions in brain and its role in Alzheimer's disease (2017) · cites this paper as [3]

    The Introduction and Receptor and Heparan Sulfate Proteoglycan Binding Activity section describe ApoE’s role in plasma lipoprotein clearance and link ApoE variants to type III hyperlipoproteinemia. The paper does not substantiate the cited clause’s claim about atherosclerosis; its discussion of blood–brain barrier integrity does not link either peripheral condition to effects on cerebral vasculature. No page numbers are available in our copy. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • APOE has diverse roles in numerous biological processes including lipid metabolism, immunity, mitochondrial function, and neuronal repair.

    “This is a product of the pronounced complexity of APOE, which has diverse roles in numerous biological processes including lipid metabolism, immunity, mitochondrial function, and neuronal repair (7,37).”

    From Apolipoprotein E2 Stimulates Protein Synthesis and Promotes Melanoma Progression and Metastasis (2023) · cites this paper as [37]

    The Introduction describes apoE’s role in lipid transport, and the neurobiology section links it to peripheral nerve repair. The paper also describes effects on mitochondrial function. It reports apoE production by macrophages and an apoE4-linked proinflammatory pathway, but does not clearly establish the broader claimed role in immunity. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • The ApoE-lipoprotein complex has been shown to alter the lipid profile of cancer and noncancerous cells.

    “The ApoE-lipoprotein complex has been shown to alter the lipid profile of cancer and noncancerous cells (47–49).”

    From Secreted Apoe rewires melanoma cell state vulnerability to ferroptosis (2024) · cites this paper as [48]

    The Introduction and “Structure and Function of ApoE Isoforms in Lipid Metabolism” sections (page numbers unavailable) say that apoE-containing lipoproteins transport lipids among cells and help regulate tissue lipid content. They do not report a demonstrated change in the lipid profiles of both cancer and noncancerous cells; the mention of neuroblastoma cells concerns neurite outgrowth, not their lipid profile. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

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Authors
Huang, Y., & Mahley, R. W.
Affiliations
University of California, San Francisco (US)
Corresponding author
Huang, Yadong
Venue
Neurobiology of Disease
Publisher
Elsevier BV
Published
2014-12
Volume
72
Pages
3-12
ISSN
0969-9961 (ISSN-L)
OpenAlex
W2056516296
Cited by
829
References
153
Citations by year
2026: 89 · 2025: 130 · 2024: 113 · 2023: 86 · 2022: 90 · 2021: 79 · 2020: 59 · 2019: 54 · 2018: 41 · 2017: 34 · 2016: 37 · 2015: 16
FWCI
3.41
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Disease (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Heath (P50AG023501, 1RF1AG047655, 2P50AG023501)
  • S.D. Bechtel, Jr. Foundation
  • Hellman Foundation
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
apolipoprotein E, APOE isoforms, APOE ε4, lipid metabolism, neurobiology, Alzheimer's disease, lipoprotein binding, cell surface receptors, lipid redistribution, cytoskeletal assembly, mitochondrial function, dendritic morphology, protein structure, neurodegeneration
MeSH terms
Alzheimer Disease, Animals, Apolipoproteins E, Brain, Disease Models, Animal, Humans, Protein Binding, Lipid Metabolism, Mice

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