血管生成
视网膜
细胞生物学
磷酸化
Src家族激酶
新生血管
血管内皮生长因子
视网膜
信号转导
生物
激酶
血管内皮生长因子A
早产儿视网膜病变
原癌基因酪氨酸蛋白激酶Src
癌症研究
酪氨酸磷酸化
神经科学
生物化学
胎龄
怀孕
血管内皮生长因子受体
遗传学
作者
Xiang Q. Werdich,John S. Penn
摘要
purpose. Src family kinases (SFKs) are membrane-attached nonreceptor protein tyrosine kinases that link a variety of extracellular cues to intracellular signal pathways. The purpose of this study was to characterize the roles of SFKs in vascular endothelial growth factor (VEGF)–mediated retinal angiogenesis. methods. Primary rat retinal glial Müller cells and bovine and human retinal microvascular endothelial cells (RMECs) were used in the in vitro studies. A rat model of retinopathy of prematurity (ROP) was used in the in vivo studies. results. In vitro, SFKs were essential for hypoxia-induced VEGF expression in Müller cells and for VEGF signaling in RMECs. However, neither process required significant further phosphorylation of the SFK activation loop Tyr416. In vivo, in a rat model of ROP, a pronounced increase of retinal SFK Tyr416 phosphorylation was observed that was specifically associated with pathologic angiogenesis. These retinas also expressed significantly higher levels of VEGF than did those in healthy controls. Immunohistochemical analysis indicated that Müller cells were the major source of the elevated level of phospho-SFK Tyr416. Intravitreous injection of a selective SFK inhibitor, PP2, significantly reduced retinal VEGF and retinopathy in the ROP model, indicating that SFKs acted as important regulators in abnormal retinal angiogenesis. conclusions. Together, these data suggest that SFK activation through a Tyr416-dependent mechanism may be an important factor in the pathogenesis of retinal neovascularization.
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