Abstract
The effect of CO on the expression of iNOS and COX-2 was investigated by using a CO-releasing molecule (CORM)-2 in LPS-activated RAW 264.7 cells in vitro. Interestingly, CORM-2 significantly inhibited iNOS (NO) but not COX-2 (PGE2) expression. PPAR-γ activators such as troglitazone, GW1929, and 15-deoxy-Δ12, 14- prostaglandin J2 showed preferential inhibitory effect on iNOS over COX-2 expression in LPS-activated macrophages. The same effect was shown in lung tissues (iNOS, COX-2) and serum (NO, PGE2) when administered of CORM-2 in LPS-induced septic mice, indicating that CO derived from CORM-2 differentially regulates iNOS and COX-2 through PPAR-γ activation under inflammation state.
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Acknowledgments
This study was supported by a grant of the Korea Healthcare technology R&D Project, Ministry of Health & Welfare, Republic of Korea. (A080506) and also supported by MRC program of Ministry of Science and Technology/Korea Science and Engineering Foundation (R13-2005-012-01003-0). Konstantin T and Y.M Ha were supported by BK21 program. We greatly thank Dr. Choi A. M. K. from Harvard Medical School for his commentaries.
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Tsoyi, K., Ha, Y.M., Kim, Y.M. et al. Activation of PPAR-γ by Carbon Monoxide from CORM-2 Leads to the Inhibition of iNOS but not COX-2 Expression in LPS-Stimulated Macrophages. Inflammation 32, 364–371 (2009). https://doi.org/10.1007/s10753-009-9144-0
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DOI: https://doi.org/10.1007/s10753-009-9144-0