Cited by 168Phagocytosis and Immune RegulationAtherosclerosis and Cardiovascular DiseasesCholesterol and Lipid Metabolism

Macrophage LRP-1 Controls Plaque Cellularity by Regulating Efferocytosis and Akt Activation

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Yancey, Patricia G., Blakemore, John, Ding, Lei, Fan, Daping, Overton, Cheryl D., Zhang, Youmin, Linton, MacRae F., Fazio, Sergio·2010·Arteriosclerosis, Thrombosis, and Vascular Biology

Abstract

Objective— The balance between apoptosis susceptibility and efferocytosis of macrophages is central to plaque remodeling and inflammation. LRP-1 and its ligand, apolipoprotein E, have been implicated in efferocytosis and apoptosis in some cell types. We investigated the involvement of the macrophage LRP-1/apolipoprotein E axis in controlling plaque apoptosis and efferocytosis. Method and Results— LRP-1 −/− macrophages displayed nearly 2-fold more TUNEL positivity compared to wild-type cells in the presence of DMEM alone or with either lipopolysaccharide or oxidized low-density lipoprotein. The survival kinase, phosphorylated Akt, was barely detectable in LRP-1 −/− cells, causing decreased phosphorylated Bad and increased cleaved caspase-3. Regardless of the apoptotic stimulation and degree of cell death, LRP-1 −/− macrophages displayed enhanced inflammation with increased IL-1β, IL-6, and tumor necrosis factor-α expression. Efferocytosis of apoptotic macrophages was reduced by 60% in LRP-1 −/− vs wild-type macrophages despite increased apolipoprotein E expression by both LRP-1 −/− phagocytes and wild-type apoptotic cells. Compared to wild-type macrophage lesions, LRP-1 −/− lesions had 5.7-fold more necrotic core with more dead cells not associated with macrophages. Conclusion— Macrophage LRP-1 deficiency increases cell death and inflammation by impairing phosphorylated Akt activation and efferocytosis. Increased apolipoprotein E expression in LRP-1 −/− macrophages suggests that the LRP-1/apolipoprotein E axis regulates the balance between apoptosis and efferocytosis, thereby preventing necrotic core formation.

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  1. [19]Fazio S Babaev V Murray A Hasty A Carter K Gleaves L Atkinson J Linton M Increased atherosclerosis in C57BL/6 mice transplanted with apo E null bone marrow Proc Natl Acad Sci USA 1997 94 4647 4652 9114045 PMC20778

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Authors
Yancey, P. G., Blakemore, J., Ding, L., Fan, D., Overton, C. D., Zhang, Y., Linton, M. F., & Fazio, S.
Affiliations
Vanderbilt University Medical Center (US)
Venue
Arteriosclerosis, Thrombosis, and Vascular Biology
Published
2010-04
Volume
30
Issue
4
Pages
787-795
ISSN
  • 1079-5642 (ISSN-L)
  • 1524-4636
OpenAlex
W2108626579
Cited by
168
References
59
Citations by year
2026: 12 · 2025: 13 · 2024: 8 · 2023: 12 · 2022: 15 · 2021: 12 · 2020: 7 · 2019: 9 · 2018: 10 · 2017: 10 · 2016: 8 · 2015: 14 · 2014: 6 · 2013: 8 · 2012: 10
FWCI
4.25
Type
journal article
Language
en
Open access
Locations
  • Arteriosclerosis Thrombosis and Vascular Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (R01HL057986, R01HL065709, HL57986, R01HL086988, HL 53989, R01HL065405, HL 65405, R01HL053989, HL65709)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK59637, U24DK059637)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
LRP1, apolipoprotein E, efferocytosis, macrophage apoptosis, Akt signaling, atherosclerosis, plaque inflammation, necrotic core, macrophage phagocytosis, oxidized LDL, lipopolysaccharide, caspase-3, Bad phosphorylation
MeSH terms
Animals, Apolipoproteins E, Cell Survival, Cells, Cultured, Enzyme Activation, Female, Inflammation, Lipopolysaccharides, Lipoproteins, LDL, Necrosis, Phagocytosis, Phosphorylation, Receptors, LDL, Tumor Necrosis Factor-alpha, Interleukin-6, Apoptosis, Macrophages, Peritoneal, Mice, Knockout, In Situ Nick-End Labeling, Tumor Suppressor Proteins, Low Density Lipoprotein Receptor-Related Protein-1, Atherosclerosis, Proto-Oncogene Proteins c-akt, Mice, Interleukin-1beta

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