Age-Related Impairments in Immune Cell Efferocytosis and Autophagy Hinder Atherosclerosis Regression
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View abstract on PubMed
Summary
This summary is machine-generated.Aging impairs macrophage function, hindering atherosclerosis regression. Older macrophages show reduced efferocytosis and autophagy, leading to persistent plaque buildup. Targeted therapies are needed for aging populations.
Area Of Science
- Cardiovascular Biology
- Immunology
- Aging Research
Background
- Aging is a known risk factor for atherosclerosis development and progression.
- The precise molecular mechanisms linking aging to atherosclerosis, and its impact on regression, are not well understood.
Purpose Of The Study
- To investigate age-related changes in macrophage function that may impede atherosclerosis regression.
- To explore the role of immune cell aging in the process of atherosclerosis regression.
Main Methods
- Macrophages from young and old mice were analyzed in vitro for metabolic and proteomic changes after lipid loading.
- Bone marrow from young and old donors was transplanted into recipient mice to study atherosclerosis regression following a Western diet and subsequent diet switch.
Main Results
- Old macrophages accumulated more lipids and showed impaired autophagy and cholesterol efflux compared to young macrophages.
- Proteomic analysis revealed downregulated pathways for endocytosis, engulfment, and phagocytosis in aged macrophages, reducing efferocytic capacity.
- Mice receiving bone marrow from old donors exhibited impaired atherosclerosis regression, with inefficient inflammatory cell resolution and reduced plaque clearance.
Conclusions
- Aging negatively impacts macrophage efferocytosis and autophagy, thereby limiting the body's ability to regress atherosclerosis.
- Understanding these age-related mechanisms is crucial for developing effective therapies for atherosclerosis in the elderly.
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