也发生重排,从不规则方向到沿细胞运动轴向排列,其作用可能是细胞移行时指引胞体向前牵拉并锚于粘着斑上[7]。细胞骨架系统对愈合过程中细胞的分化、增殖可能起重要的调节作用。创伤时,内源性生长因子、炎性介质或其它调节因子作用于细胞膜,通过膜中相应受体或蛋白质引起细胞内cAMP、IP3以及Ca2+、CaM等第二和第三信使系统链锁反应,激活蛋白激酶类[8],最后调节到细胞骨架系统及其结合蛋白质上,使细胞骨架系统按细胞生理和周期的需要,发挥其独特的功能,参加细胞的活动。调节因子还可能通过膜表面的整合素(integrin)跨膜与细胞内的微丝系统发生联系[9],将胞外刺激信号传给膜下微丝系统,继续传导至核膜及核内骨架,调控基因表达,从而影响细胞的分化、增殖及细胞行为的改变。因此,对细胞骨架系统在创伤修复过程中作用的不断认识,将有助于进一步理解创伤愈合过程的调控机制。 【参考文献】 1 Gotlieb AI, Langille BL, Wong MKK, et al. Structure and function of the endothelial cytoskeleton. Lab Invest,1991,65:123. 2 Jaffe EA, Nachman RL, Becker CG, et al. Culture of human endothelial cells derived from umbilical veins. J Clin Invest,1973,52:2745. 3 Burk RR. A factor from a transformed cell line that affects igration. Proc Natl Acad Sci USA,1973,70:369. 4 Luna EJ, Hitt AL. Cytoskeleton-plasma membrane interactions.Science, 1992,258-955. 5 Singer I. Association of fibronectin and vinculin with focal contacts and stress fibers in vascular endothelial cells in vivo. Science,1983,219:867. 6 Shasby MD, Shasby SS, Sullivan JM, et al. Role of endothelial cytoskeleton in control of endothelial permeability. Circ Res,1982,51:657. 7 Burkley IK. Fine structural and related aspects of nonmuscle-cell motility. Cell Muscle Motil,1981,1:137. 8 Volberg T,Geiger B, Citi S, et al. Effect of protein kinas inhibitor H-7 on the contractility, and membrane anchorage of the microfilament system. Cell Motil Cytoskeleton,1994,29:321. 9 Miyamoto S, Teramoto H, Coso O, et al. Integrin function:molicular hierarchiea of cytoskeletal and signal molecules. J Cell Biol,1995,131:791. 上一页 [1] [2]
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