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首页> 外文期刊>Journal of Cellular Physiology >Smooth muscle cells isolated from the neointima after vascular injury exhibit altered responses to platelet-derived growth factor and other stimuli.
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Smooth muscle cells isolated from the neointima after vascular injury exhibit altered responses to platelet-derived growth factor and other stimuli.

机译:从neointima平滑肌细胞分离血管损伤后表现出改变的反应血小板源生长因子和其他刺激。

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摘要

A variety of evidence suggests that vascular smooth muscle cells (SMC) exhibit a more immature phenotype when stimulated by injury to replicate in the adult. One growth characteristic common to immature (embryonic, fetal, and neonatal) SMC is a markedly reduced responsiveness to platelet-derived growth factor (PDGF) and other mitogenic stimuli. Here we demonstrate that SMC isolated from the 14-day neointima of experimentally injured carotid arteries exhibit a similar growth phenotype. The proliferative responses of neointimal cells to the BB homodimer of PDGF, which interacts with both forms of the PDGF receptor, were up to twenty-fold less (as assessed by BrdU immunocytochemistry) than that of adult control tunica media cells over a wide range of PDGF concentrations. Paradoxically, these cells expressed abundant mRNA for the alpha- and beta-subunits of the PDGF receptor (by RT-PCR) and expressed abundant PDGF receptor protein (by Western blotting). Addition of PDGF-BB to neointimal SMC induced significant autophosphorylation of the PDGF receptor, suggesting that the PDGF receptors were fully functional. The chemotactic responses of neointimal SMC to PDGF, in in vitro migration assays, were identical to that of control medial cells. The data further establish the existence of vascular SMC phenotypes characterized by a refractoriness to growth stimulation by specific mitogens, and provide further evidence for the reiteration of developmentally regulated programs following vascular injury in vivo.
机译:各种各样的证据表明血管平滑肌细胞(SMC)展示一个更不成熟当刺激伤害的表现型复制在成人。不成熟(胚胎、胎儿和新生儿)SMC明显减少了响应能力血小板源生长因子(PDGF)和其他促有丝分裂的刺激。14日neointima的孤立实验颈动脉表现出受伤类似的生长表型。BB为血管内膜细胞的反应PDGF的与这两种形式的相互作用PDGF受体,降低甚为可观评估BrdU免疫细胞化学)成人控制细胞中模的宽PDGF浓度范围。这些细胞丰富的mRNA的表达α-和beta-subunits PDGF受体(通过rt - pcr)和丰富的PDGF受体表达通过免疫印迹蛋白质()。PDGF-BB新生内膜SMC诱导显著PDGF受体的自身磷酸化,这表明PDGF受体完全功能。血管内膜SMC PDGF,体外迁移化验,相同的控制内侧细胞。血管SMC表型特征耐火度增长由特定的刺激有丝分裂原,并提供进一步的证据重复的监管程序血管损伤后体内。

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