Apolipoprotein E: From lipid transport to neurobiology
Open accessAbstract
Apolipoprotein (apo) E has a storied history as a lipid transport protein. The integral association between cholesterol homeostasis and lipoprotein clearance from circulation are intimately related to apoE's function as a ligand for cell-surface receptors of the low-density lipoprotein receptor family. The receptor binding properties of apoE are strongly influenced by isoform specific amino acid differences as well as the lipidation state of the protein. As understanding of apoE as a structural component of circulating plasma lipoproteins has evolved, exciting developments in neurobiology have revitalized interest in apoE. The strong and enduring correlation between the apoE4 isoform and age of onset and increased risk of Alzheimer's disease has catapulted apoE to the forefront of neurobiology. Using genetic tools generated for study of apoE lipoprotein metabolism, transgenic "knock-in" and gene-disrupted mice are now favored models for study of its role in a variety of neurodegenerative diseases. Key structural knowledge of apoE and isoform-specific differences is driving research activity designed to elucidate how a single amino acid change can manifest such profoundly significant pathological consequences. This review describes apoE through a lens of structure-based knowledge that leads to hypotheses that attempt to explain the functions of apoE and isoform-specific effects relating to disease mechanism.
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Binding of lipids is required for ApoE to acquire a biologically active conformation necessary for recognition and binding to members of the LDLR family and its internalization.
“The binding of lipids is required for ApoE to acquire a biologically active conformation, which is necessary for recognition and binding to the members of the low-density lipoprotein receptor (LDLR) family and its internalization (24).”
From Secreted Apoe rewires melanoma cell state vulnerability to ferroptosis (2024) · cites this paper as [24]
Studies of brain histology, neurodegenerative markers, cholinergic activity, and neuronal function in knockout mice have been equivocal.
“Studies of brain histology, neurodegenerative markers, cholinergic activity, and neuronal function in knockout mice have been equivocal.39”
From Effects of the Absence of Apolipoprotein E on Lipoproteins, Neurocognitive Function, and Retinal Function (2014) · cites this paper as [39]
Apolipoprotein E is produced and secreted mainly by astrocytes and is believed to be important for normal brain function.
“Produced and secreted mainly by astrocytes,39 it is believed to be important for normal brain function.”
From Effects of the Absence of Apolipoprotein E on Lipoproteins, Neurocognitive Function, and Retinal Function (2014) · cites this paper as [39]
ApoE is a lipid-binding protein that transports lipids across organs in the periphery and between different cell types in the brain.
“Apolipoprotein E (ApoE) is a lipid-binding protein that transports lipids across organs in the periphery and between different cell types in the brain (Hauser et al., 2011).”
From ApoE4 Impairs Neuron-Astrocyte Coupling of Fatty Acid Metabolism (2021) · cites this paper as Hauser et al., 2011
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200 of 202 shown
- Authors
- Hauser, P. S., Narayanaswami, V., & Ryan, R. O.
- Affiliations
- University of California, Berkeley (US)
- California State University, Long Beach (US)
- Corresponding author
- Ryan, Robert O.
- Venue
- Progress in Lipid Research
- Publisher
- Elsevier BV
- Published
- 2011-01
- Volume
- 50
- Issue
- 1
- Pages
- 62-74
- ISSN
- 0163-7827 (ISSN-L)
- PMC
- PMC3022415
- OpenAlex
- W1973065853
- Cited by
- 320
- References
- 252
- Citations by year
- 2026: 21 · 2025: 20 · 2024: 25 · 2023: 25 · 2022: 25 · 2021: 14 · 2020: 23 · 2019: 17 · 2018: 13 · 2017: 12 · 2016: 13 · 2015: 25 · 2014: 25 · 2013: 30 · 2012: 23
- FWCI
- 1.98
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Progress in Lipid Research (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- California Tobacco-Related Disease Research Program (16DT-0195, 17RT-0165)
- National Institutes of Health (HL 64159)
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
- Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
- Keywords
- apolipoprotein E, APOE isoforms, APOE ε4, Alzheimer's disease, cholesterol homeostasis, lipoprotein clearance, low-density lipoprotein receptor family, receptor binding, lipid modification, serum lipoproteins, neurodegenerative diseases, transgenic mouse model
- MeSH terms
- Alzheimer Disease, Animals, Apolipoproteins E, Biological Transport, Humans, Neurobiology, tau Proteins, Lipid Metabolism
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