TNF-α induces MMP-9 expression via activation of Src/EGFR, PDGFR/PI3K/Akt cascade and promotion of NF-κB/p300 binding in human tracheal smooth muscle cells

被引:161
作者
Lee, Chiang-Wen
Lin, Chih-Chung
Lin, Wei-Ning
Liang, Kao-Chih
Luo, Shue-Feng
Wu, Chow-Bin
Wang, Shyi-Wu
Yang, Chuen-Mao
机构
[1] Chang Gung Univ, Chang Gung Mem Hosp, Dept Physiol & Pharmacol, Tao Yuan, Taiwan
[2] Chang Gung Univ, Chang Gung Mem Hosp, Dept Anesthet, Tao Yuan, Taiwan
[3] Chang Gung Univ, Chang Gung Mem Hosp, Dept Internal Med, Tao Yuan, Taiwan
[4] Chang Gung Univ, Chang Gung Mem Hosp, Dept Dent, Tao Yuan, Taiwan
关键词
transactivation of growth factor receptors; chromatin remodeling; transcription factors; histone modifications;
D O I
10.1152/ajplung.00311.2006
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
TNF-alpha has been shown to induce matrix metalloproteinase-9 (MMP-9) expression, which, in turn, degrades extracellular matrix in the inflammatory responses. However, the inductive mechanisms of the MMP-9 by TNF-alpha remain unclear. In human tracheal smooth muscle cells, TNF-alpha induced MMP-9 expression and Akt phosphorylation in a time-dependent manner, which was attenuated by the inhibitors of Src (PP1), epidermal growth factor receptor (AG1478), PDGFR (AG1296), and PI3K (LY294002), respectively, revealed by reporter gene assay, RT-PCR, zymographic, and Western blot analyses. Transfection with the dominant negative mutants of c-Src (KM, K295M [kinase inactive mutant]), p85, and Akt (KA, K179A) also reduced MMP-9 expression. These findings indicated that MMP-9 expression was regulated by PI3K/Akt via the transactivation of growth factor receptors. Furthermore, LY294002 or wortmannin inhibited Akt phosphorylation but had no effect on NF-kappa B translocation, which was blocked by helenalin. Mutated NF-kappa B DNA binding element in the MMP-9 promoter and helenalin also attenuated MMP-9 expression, suggesting that PI3K/Akt and NF-kappa B independently regulated MMP-9 expression. To support this notion, immunofluorescence staining and immunoprecipitation were applied to characterize the transcription factors involved in these responses. The results showed that LY294002 and curcumin blocked Akt translocation into nucleus. In contrast, p300, acetyl-histone (H3), and NF-kappa B p65 were found to be coimmunoprecipitated with the phosphorylated Akt, indicating that these components associated with the MMP-9 promoter are revealed by chromatin immunoprecipitation assay. Thus, our study provides a new insight into the molecular mechanisms that TNF-alpha-stimulated Akt phosphorylation mediated through transactivation of Src and growth factor receptors may stimulate the recruitment of p300, assemble transcription factor (p65), and then lead to MMP-9 expression.
引用
收藏
页码:L799 / L812
页数:14
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