alexa Apolipoprotein E inhibits platelet-derived growth factor-induced vascular smooth muscle cell migration and proliferation by suppressing signal transduction and preventing cell entry to G1 phase.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Molecular and Genetic Medicine

Author(s): Ishigami M, Swertfeger DK, Granholm NA, Hui DY

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Abstract The anti-atherogenic effects of apolipoprotein (apo) E have been attributed to its ability to reduce plasma cholesterol level and to limit foam cell formation. The purpose of this study was to ascertain if apoE also may have cytostatic functions that could attenuate vascular occlusive diseases. Purified apoE inhibited smooth muscle cell migration directed to platelet-derived growth factor (PDGF) or oxidized LDL (oxLDL) (p < 0.0001). The purified apoE also suppressed PDGF- and oxLDL-induced smooth muscle cell proliferation (p < 0.001). These apoE inhibitory effects were not because of suppression of PDGF binding to its receptors on the smooth muscle cells, but was correlated with a significant reduction in agonist-stimulated mitogen-activated protein kinase activity (p < 0.01). ApoE also inhibited PDGF-induced cyclin D1 mRNA expression, suggesting that the apoE effect was mediated by growth arrest at the G0 to G1 phase. Taken together, these results suggest that apoE has cytostatic functions in the vessel wall and may protect against vascular diseases through inhibition of cell signaling events associated with growth factor-induced smooth muscle cell migration and proliferation.
This article was published in J Biol Chem and referenced in Journal of Molecular and Genetic Medicine

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