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Effects of estrogens on macrophage foam cells: a potential target for the protective effects of estrogens on
1Department of Pathology, Bowman Gray School of Medicine of Wake Forest University, Winston-Salem, NC 27157, USA.
Abstract:
Estrogens have been shown to reduce markedly the development of atherosclerosis in humans and in several animal models. More than 50% of this effect appears to be caused by a direct action on the arterial wall. Although estrogens can affect a variety of functions of endothelial cells and smooth muscle cells, data published over the past few years suggest that macrophage foam cells may also be an important site of estrogen action. This review summarizes the recent data on the effects of estrogens on macrophage foam cell function. The data suggest that estrogens act in several ways to reduce the accumulation of cholesteryl esters in macrophages.
Insights
Estrogens significantly reduce atherosclerosis by directly impacting arterial walls and macrophage foam cells. This review highlights how estrogens decrease cholesteryl ester accumulation in macrophages, a key factor in preventing this cardiovascular disease.
Area of Science:
- Cardiovascular Science
- Endocrinology
- Cell Biology
Background:
- Atherosclerosis development is markedly reduced by estrogens in humans and animal models.
- Estrogenic effects on the arterial wall account for over 50% of this protective action.
- Macrophages, specifically macrophage foam cells, are emerging as a significant site for estrogen action.
Purpose of the Study:
- To review recent data on the effects of estrogens on macrophage foam cell function.
- To elucidate the mechanisms by which estrogens influence macrophage lipid accumulation.
Main Methods:
- Literature review of studies investigating estrogen effects on macrophage foam cells.
- Analysis of data on cellular functions affected by estrogens.
Main Results:
- Estrogens exert multiple effects on macrophage foam cell function.
- Estrogens demonstrably reduce the accumulation of cholesteryl esters within macrophages.
- These actions contribute to the overall anti-atherosclerotic effects of estrogens.
Conclusions:
- Macrophage foam cells are a crucial target for the atheroprotective effects of estrogens.
- Estrogen's ability to reduce lipid accumulation in macrophages is a key mechanism in preventing atherosclerosis.
- Further research into estrogen's role in macrophage biology is warranted.