每年出版 4 期
ISSN 打印: 0731-8898
ISSN 在线: 2162-6537
Indexed in
Silica Induces Human Cyclooxygenase-2 Gene Expression Through the NF-kB Signaling Pathway
摘要
Silica is a causative factor of acute cell injury in pulmonary fibrosis. Inducible cyclooxygenase-2 (COX-2) was suggested to play a role in the process of inflammation and fibrosis. We report that silica induces COX-2 expression in WI-38 fibroblasts. Further analysis showed that silica activated the transcription of COX-2 gene primarily via a nuclear factor (NF)-kB binding site in the promoter. NF-kB-inducing kinase (NIK) and TGF-k activated kinase 1 (TAK1), the upstream signaling molecules of NF-kB, are involved in the silica-mediated COX-2 expression. The Electrophoretic Mobility Shift Assay (EMSA) showed that silica induced the direct binding of NF-kB on the putative binding site in COX-2 promoter. These results suggest that silica activates the human COX-2 gene transcription through the induction of NF-kB activity.
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