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[Tryptase inhibits cell apoptosis through upregulating PAR-2 and Rho kinase in rheumatoid arthritis synovial fibroblasts].
Xi Bao Yu Fen Zi Mian Yi Xue za Zhi = Chinese Journal of Cellular and Molecular Immunology 2016 December
Objective To investigate the regulatory effects of tryptase on protease-activated receptors 2 (PAR-2), Rho signal pathway and apoptosis of MH7A rheumatoid arthritis synovial fibroblasts. Methods In MH7A cells, the expression of PAR-2 was measured by flow cytometry; cell apoptosis was examined by annexin V- FITC/PI staining combined with flow cytometry; the expression of Rho kinase was detected by Pull-down assay and Western botting. Results Tryptase upregulated the expression of PAR-2 in MH7A cells, and suppressed Fas-mediated apoptosis of MH7A cells in a dose-dependent manner. Meanwhile, PAR-2 inhibitor, FSLLRY-NH2 significantly reduced anti-apoptotic effects of tryptase in MH7A cells, which was related with the increase of activated Rho kinase expression. Conclusion Tryptase plays a role in resistance to the apoptosis of MH7A cells through raising PAR-2 and activating Rho kinase.
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