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Thrombospondin 1, fibronectin, and vitronectin are differentially dependent upon RAS, ERK1/2, and p38 for induction of vascular smooth muscle cell chemotaxis.

Vasc Endovascular Surg. 2011 Jan;45(1):55-62
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摘要


BACKGROUND:Thrombospondin 1 (TSP-1), fibronectin (Fn), and vitronectin (Vn) promote vascular smooth muscle cell (VSMC) chemotaxis through a variety of second messenger systems, including Ras, ERK1/2, and p38. HYPOTHESIS:Ras, ERK1/2, and p38 differentially affect TSP-1-, Fn-, and Vn-induced VSMC chemotaxis. METHODS:Bovine VSMCs were transfected with Ras N17 or treated with the following inhibitors: a farnesyl protein transferase (FPT) inhibitor, PD098059 (ERK1/2 inhibitor), or SB202190 (p38 inhibitor). Thrombospondin 1, Fn, and Vn were used as chemoattractants. Results were analyzed by analysis of variance (ANOVA) with post hoc testing (P < .05). RESULTS:Ras N17 transfection or FPT inhibitor treatment inhibited TSP-1-, Fn-, and Vn-induced chemotaxis. PD098059 or SB202190 resulted in more inhibition of VSMC migration to TSP-1 than to Fn or Vn. CONCLUSIONS:Ras appears equally relevant in the signal transduction pathways of TSP-1-, Fn-, and Vn-induced VSMC chemotaxis. Thrombospondin 1-induced migration is more dependent upon ERK1/2 and p38 than Fn- or Vn-included migration.

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