Cited by 37Alzheimer's disease research and treatmentsLipid metabolism and disordersDementia and Cognitive Impairment Research

Genetic Variants of Lipoprotein Lipase and Regulatory Factors Associated with Alzheimer’s Disease Risk

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D. Bruce, Kimberley, Tang, Maoping, Reigan, Philip, H. Eckel, Robert·2020·International Journal of Molecular Sciences

Abstract

Lipoprotein lipase (LPL) is a key enzyme in lipid and lipoprotein metabolism. The canonical role of LPL involves the hydrolysis of triglyceride-rich lipoproteins for the provision of FFAs to metabolic tissues. However, LPL may also contribute to lipoprotein uptake by acting as a molecular bridge between lipoproteins and cell surface receptors. Recent studies have shown that LPL is abundantly expressed in the brain and predominantly expressed in the macrophages and microglia of the human and murine brain. Moreover, recent findings suggest that LPL plays a direct role in microglial function, metabolism, and phagocytosis of extracellular factors such as amyloid- beta (Aβ). Although the precise function of LPL in the brain remains to be determined, several studies have implicated LPL variants in Alzheimer’s disease (AD) risk. For example, while mutations shown to have a deleterious effect on LPL function and expression (e.g., N291S, HindIII, and PvuII) have been associated with increased AD risk, a mutation associated with increased bridging function (S447X) may be protective against AD. Recent studies have also shown that genetic variants in endogenous LPL activators (ApoC-II) and inhibitors (ApoC-III) can increase and decrease AD risk, respectively, consistent with the notion that LPL may play a protective role in AD pathogenesis. Here, we review recent advances in our understanding of LPL structure and function, which largely point to a protective role of functional LPL in AD neuropathogenesis.

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Crossref · 10.3390/ijms21218338

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  • Patients with the gain-of-function LPL polymorphism (S447X) have reduced VLDL-TGs, higher HDL, and reduced amyloid load in the hippocampus.

    “In contrast, patients with the gain-of-function LPL polymorphism (S447X) have reduced very-low-density lipoprotein triglycerides (VLDL-TGs), higher high-density lipoproteins (HDL), and reduced amyloid load in the hippocampus [28].”

    From Lipoprotein Lipase Regulates Microglial Lipid Droplet Accumulation (2021) · cites this paper as [28]

    The Introduction (page unavailable) reports lower VLDL-TG and reduced amyloid plaque formation in patients with S447X; Section 4 identifies it as a gain-of-function variant. The copy does not locate the reduced plaques in the hippocampus or report higher HDL in these patients. Section 4 discusses uptake of HDL, which is not the same as a higher HDL level. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • LPL is strongly expressed in the hypothalamus, hippocampus, and striatum.

    “LPL hydrolyzes circulating chylomicrons and very-low-density lipoprotein, is a regulator of brain energy balance, is strongly expressed in the hypothalamus, hippocampus, and striatum, and LPL variants are associated with neurite pathology and Alzheimer disease [96–98].”

    From Sterol and lipid analyses identifies hypolipidemia and apolipoprotein disorders in autism associated with adaptive functioning deficits (2021) · cites this paper as [98]

    Section 3, “LPL in the Central Nervous System” (page unavailable), reports LPL in hypothalamic neurons and increased expression in cultures of hypothalamus-derived astrocytes. It does not establish strong expression in the hypothalamus or identify the hippocampus and striatum as sites of strong expression. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • The S447X mutation removes residues in the C-terminal tail of LPL, exposing a receptor-binding region that contributes to increased LPL-mediated endocytosis.

    “In vitro and modeling studies suggest that the S447X mutation removes residues in the C-terminal tail of LPL, exposing a receptor-binding region that contributes to increased LPL-mediated endocytosis [28,29].”
  • Several LPL polymorphisms have been linked to increased AD risk.

    “In addition, several LPL polymorphisms have been linked to increased AD risk [28].”
  • LPL is a regulator of brain energy balance.

    “LPL hydrolyzes circulating chylomicrons and very-low-density lipoprotein, is a regulator of brain energy balance, is strongly expressed in the hypothalamus, hippocampus, and striatum, and LPL variants are associated with neurite pathology and Alzheimer disease [96–98].”

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Authors
D. Bruce, K., Tang, M., Reigan, P., & H. Eckel, R.
Affiliations
  • Division of Endocrinology, Metabolism, and Diabetes, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
  • University of Colorado Anschutz (US)
Venue
International Journal of Molecular Sciences
Publisher
MDPI AG
Published
2020-11-06
Volume
21
Issue
21
Pages
8338
ISSN
1422-0067 (ISSN-L)
OpenAlex
W3095753974
Cited by
36
References
97
Citations by year
2026: 2 · 2025: 12 · 2024: 5 · 2023: 5 · 2022: 7 · 2021: 5
FWCI
0.54
Type
journal article
Language
en
Open access
Locations
  • International Journal of Molecular Sciences (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institutes of Health (5KL2TR002534-02)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
lipoprotein lipase, Alzheimer's disease, genetic variants, apolipoprotein C-II, apolipoprotein C-III, microglia, amyloid-beta phagocytosis, lipoprotein metabolism, neuroprotection, triglyceride-rich lipoproteins
MeSH terms
Alzheimer Disease, Animals, Humans, Lipoprotein Lipase, Lipoproteins, Macrophages, Mutation, Structure-Activity Relationship, Triglycerides, Amyloid beta-Peptides, Microglia, Mice

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