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Lysolecithin actions on vascular smooth muscle cells
R Locher1, B Weisser, T Mengden
1Department of Internal Medicine, University Hospital, Zürich, Switzerland.
Biochemical and Biophysical Research Communications
|February 28, 1992
Summary
Lysolecithin, a product of oxidized low-density lipoprotein, significantly increases calcium levels and cell growth in rat aortic smooth muscle cells, potentially contributing to atherosclerosis development.
Area of Science:
- Cardiovascular Biology
- Cellular Physiology
- Atherosclerosis Research
Background:
- Oxidation of low-density lipoprotein (LDL) is a key event in atherogenesis.
- During LDL oxidation, lecithin is converted to lysolecithin.
- Lysolecithin's role in cellular responses relevant to atherosclerosis is not fully understood.
Purpose of the Study:
- To investigate the effects of lysolecithin on rat aortic smooth muscle cells.
- To determine if lysolecithin influences intracellular calcium concentrations and cell proliferation.
Main Methods:
- Cultured rat aortic smooth muscle cells were treated with varying concentrations of lysolecithin.
- Cytosolic calcium concentrations were measured using standard techniques.
- Cell proliferation was assessed by measuring [3H]thymidine incorporation.
Main Results:
- Lysolecithin (2-25 µg/ml) caused a significant increase in cytosolic calcium concentration, up to 560% of control levels.
- Lysolecithin (10-20 µg/ml) markedly increased [3H]thymidine incorporation, indicating enhanced cell proliferation.
- Lysolecithin potentiated platelet-derived growth factor (PDGF)-induced cell proliferation.
Conclusions:
- Lysolecithin induces significant cellular responses in aortic smooth muscle cells, including calcium influx and proliferation.
- These findings suggest that lysolecithin may be a mediator through which oxidized LDL promotes cell growth.
- Lysolecithin's pro-proliferative effects contribute to the understanding of its role in the pathogenesis of atherosclerosis.