PDGF与肝素对动脉SMCI,Ⅲ型前胶原mRNA表达及胶原蛋白合成？…

目的 研究,探讨血小板源生长因子（ｐｌａｔｅｌｅｔｄｅｒｉｖｅｄｇｒｏｗｔｈｆａｃｔｏｒ,ＰＤＧＦ）和肝素对人主动脉平滑肌细胞（ｈｕｍａｎａｏｒｔａａｍｏｏｔｈｍｕｓｃｌｅ,ｃｅｌｌ,ｈＡＳＭＣ）增殖,胶原蛋白的合成,分泌以及Ｉ,Ⅲ型前胶原ｍＲＮＡ表达和转移生长因子β（ｔｒａｎｓｆｏｒｍｉｎｇｇｒｏｗｔｈｆａｃｔｏｒβ－ＴＧＦ－β）ｍＲＮＡ表达的调节作用,方法＾３Ｈ－ＴｄＲ,＾３Ｈ－脯氨酸掺入及Ｎ

The modulation of collagen synthesis and expressions of type I and III collagen mRNAs in aorta smooth muscle cell by PDGF and heparin

OBJECTIVE: The effect of platelet derived growth factor (PDGF) and heparin on the modulation of human aorta smooth muscle cell(hASMC) proliferation, collagen synthesis, expressions of type I and III collagen mRNAs as well as transforming growth factor-beta (TGF-beta) mRNA were investigated. METHODS: 3H-TdR and 3H-proline incorporation and Northern blot analysis were done. 3H-TdR and 3H-proline incorporation was statistically analyzed with t test among different experimental groups. RESULTS: In comparison to the control group, PDGF possessed the ability in promoting markedly the DNA synthesis (3H-TdR incorporation: PDGF group vs control, P < 0.01), synthesis and secretion of collagen protein (3H-proline incorporation of SMC and medium: PDGF group vs control, P < 0.01), expressions of type I and type III collagen mRNAs, and transforming growth factor mRNA in hASMC. Whereas heparin significantly decreased the DNA synthesis (heparin group vs control, P < 0.01), synthesis and secretion of collagen protein (heparin group vs control, P < 0.01) of hASMC in vitro. Heparin also inhibited the promoting effect of PDGF on DNA synthesis, the synthesis and secretion of collagen protein, and reduced the up-regulation of expressions of type I and type III collagen mRNAs as well as TGF-beta mRNA that stimulated by PDGF. CONCLUSIONS: PDGF could promote the collagen synthesis through upregulating type I and type III collagen mRNA expressions while heparin just inhibiting SMC DNA and collagen synthesis effected in the way of anti-atherosclerosis.