• thrombospondin-1-induced smooth muscle cell chemotaxis and proliferation are dependent on transforming growth factor-β2 and hyaluronic acid synthase

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     angioplasty causes local vascular injury, leading to the release of thrombospondin-1 (tsp-1), which stimulates vascular smooth muscle cell (vsmc) migration and proliferation, important steps in the development of intimal hyperplasia. transforming growth factor beta 2 (tgf-β2) and hyaluronic acid synthase (has) are two pro-stenotic genes upregulated in vsmcs by tsp-1. we hypothesized that inhibition of tgf-β2 or has would inhibit tsp-1-induced vsmc migration, proliferation, and tsp-1 signaling. our data demonstrate that inhibition of either tgf-β2 or has inhibited tsp-1-induced vsmc migration and proliferation. activation of erk 1 was decreased by tgf-β2 inhibition and unaffected by has inhibition. tgf-β2 and has are not implicated in tsp-1-induced thbs1expression, while they are each implicated in tsp-1-induced expression of their own gene. in summary, tsp-1-induced vsmc migration and proliferation rely on intact tgf-β2 signaling and has function. tsp-1 activation of erk 1 is dependent on tgf-β2. these data further expand our understanding of the complexity of tsp-1 cellular signaling and the involvement of tgf-β2 and has.

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