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- W2039752743 abstract "Background/Aims: The chemokine CXCL1 has been reported to be expressed in lung airway epithelium and non-small cell lung cancer biopsy specimens. In this study, we investigated the effects of TNF-α, an abundant cytokine detected in inflammation and various cancers, on CXCL1 release by human A549 lung carcinoma epithelial cells. Methods: CXCL1 expression was determined by ELISA and RT-PCR. TNF-α signaling was examined by western blotting. Monocyte migration was assayed by a Transwell migration system. Results: TNF-α stimulated CXCL1 release and mRNA expression, and this release was inhibited by inhibitors of JNK, p38 MAPK, PI-3K/Akt and AP-1 transcription factor. TNF-α treatment was followed by JNK, p38 MAPK and PI3K/Akt activation. However, only the JNK inhibitor could reduce the CXCL1 mRNA level, suggesting that JNK is required mainly for CXCL1 mRNA synthesis, whereas p38 MAPK and PI-3K/Akt might be responsible for CXCL1 secretion. Dexamethasone (dex) and TGF-β reduced CXCL1 secretion, with dex upregulating the expression of MAP kinase phosphatase-1 and TGF-β causing smad2/3 activation and nuclear translocation. A functional analysis showed that the released CXCL1 enhanced monocyte migration and could be abolished by a CXCL1 neutralizing antibody and CXCR antagonist. Conclusion: We demonstrate that TNF-α induces CXCL1 expression through the JNK, p38 MAPK and PI-3K/Akt signaling pathways in human pulmonary epithelial cells." @default.
- W2039752743 created "2016-06-24" @default.
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- W2039752743 date "2014-01-01" @default.
- W2039752743 modified "2023-10-10" @default.
- W2039752743 title "CXCL1 Regulation in Human Pulmonary Epithelial Cells by Tumor Necrosis Factor" @default.
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- W2039752743 doi "https://doi.org/10.1159/000366344" @default.
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