Tyrosine Phosphorylation Regulates H2O2Production in Lung Fibroblasts Stimulated by Transforming Growth Factor β1*

Tyrosine Phosphorylation Regulates H2O2Production in Lung Fibroblasts Stimulated by Transforming Growth Factor β1*
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酪氨酸磷酸化调节转化生长因子 β1* 刺激的肺成纤维细胞中 H2O2 的产生

DOI:
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发表时间:
1998
影响因子:
4.8
通讯作者:
B. Fanburg
B. Fanburg
中科院分区:
生物学2区
文献类型:
--
作者:
V. Thannickal;Kristen D. L. Aldweib;B. Fanburg

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转化生长因子β1(Transforming growth factor β1,TGF-β1)是一种多功能的促纤维化细胞因子,参与细胞的生长和分化。我们先前已经描述了在人肺成纤维细胞中由TGF-β1诱导的细胞表面相关的H2 O2生成NADH:黄素:O2氧化还原酶(称为NADH氧化酶)活性(Thannickal,V. J.,和Fanburg,B. L.(1995)J.Biol.Chem.270,30334-30338)。在这项研究中,这种新的TGF-β1激活的氧化酶在成纤维细胞的蛋白酪氨酸磷酸化的调节潜力进行了检查。使用抗磷酸酪氨酸抗体的免疫印迹显示,在用TGF-β1(2ng/ml)刺激的细胞中,115和103 kDa的两种蛋白质的磷酸化具有时间依赖性但延迟。与TGF-β1诱导的H2 O2产生的作用类似,这些蛋白的磷酸化被加入放线菌素D阻断。蛋白酪氨酸激酶抑制剂genistein和herbimycin A以剂量依赖性方式抑制TGF-β1诱导的蛋白酪氨酸磷酸化、NADH氧化酶激活和H2 O2产生。过氧化氢酶、二苯基碘鎓(一种黄素酶抑制剂)和苏拉明(一种受体活化抑制剂,在TGF-β1后4 h加入)对蛋白酪氨酸磷酸化的诱导没有影响。115-和103-kDa蛋白的磷酸化先于H2 O2产生,并且当TGF-β1暴露后48 h检测不到H2 O2时恢复到对照水平。这些结果表明,在人肺成纤维细胞中,由非受体蛋白酪氨酸激酶引起的蛋白酪氨酸磷酸化调节TGF-β1响应性H2 O2产生的NADH氧化酶的活性。此外,这项研究表明,TGF-β1,结合丝氨酸-苏氨酸激酶受体,能够诱导蛋白质酪氨酸磷酸化,通过延迟的方式通过信号通路,需要转录激活。
Transforming growth factor β1 (TGF-β1) is a multifunctional, profibrotic cytokine involved in cellular growth and differentiation. We have previously described a cell surface-associated H2O2-generating NADH:flavin:O2 oxidoreductase (referred to as NADH oxidase) activity in human lung fibroblasts induced by TGF-β1 (Thannickal, V. J., and Fanburg, B. L. (1995) J. Biol. Chem. 270, 30334–30338). In this study, the potential for regulation of this novel TGF-β1-activated oxidase in fibroblasts by protein tyrosine phosphorylation was examined. Immunoblots using anti-phosphotyrosine antibody demonstrated a time-dependent but delayed phosphorylation of two proteins of 115 and 103 kDa in cells stimulated with TGF-β1 (2 ng/ml). Similar to the effect on TGF-β1-induced H2O2 production, phosphorylation of these proteins was blocked by the addition of actinomycin D. The protein-tyrosine kinase inhibitors genistein and herbimycin A inhibited TGF-β1-induced protein tyrosine phosphorylation, NADH oxidase activation, and H2O2 production in a dose-dependent manner. Catalase, diphenyliodonium (an inhibitor of flavoenzymes), and suramin (an inhibitor of receptor activation, added 4 h after TGF-β1) had no effect on the induction of protein tyrosine phosphorylation. Phosphorylation of the 115- and 103-kDa proteins preceded the generation of H2O2 production and returned to control levels when H2O2 was undetectable at 48 h after TGF-β1 exposure. These results suggest that protein tyrosine phosphorylation by a nonreceptor protein-tyrosine kinase(s) regulates the activity of the TGF-β1-responsive H2O2-generating NADH oxidase in human lung fibroblasts. Additionally, this study demonstrates that TGF-β1, which binds to a serine-threonine kinase receptor, is able to induce protein tyrosine phosphorylation in a delayed manner via a signaling pathway that requires transcriptional activation.
DOI: --
发表时间: 1995-03
期刊: Genetics
影响因子: 3.3
作者:
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影响因子: --
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DOI: 10.1073/pnas.87.24.9943
发表时间: 1990-12-01
影响因子: 11.1
作者:
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