科研之友
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摘要
Background: Evidence suggests anti-inflammatory effects of glucosamine (GS) on inflammatory diseases. COX-2 is an enzyme to produce prostaglandins. MMPs are the family of matrix metalloproteinases degradable of ECM. Excess expression of COX-2 or MMPs involves in skin inflammation. Objective: We evaluated whether GS-HCl modulates expression of COX-2 and/or MMPs by IL-1 beta or PMA in human skin fibroblasts (HSF) or keratinocytes (HaCaT). Methods: HSF or HaCaT cells were exposed to IL-1 beta or PMA without or with GS-HCl. COX-2 or MMPs protein and mRNA expression, respectively, were analyzed by Western blot and RT-PCR. MTS assay was utilized to assess the cytotoxicity of GS-HCl on HSF cells. Results: In HSF cells, IL-1 beta treatment induced COX-2 and MMP-13 expressions in association with activation of ERKs, p38 MAPK, JNKs, and NF-kappa B. PMA treatment also induced COX-2 and MMP-13 expressions in association with p38 MAN activation. Of interest, treatment with GS-HCl (10 mM) led to blockage of p38 MAPK activation, accumulation of 66 kDa COX-2 protein variant (without affecting COX-2 mRNA expression), and transcriptional down-regulation of MMP-13 in the IL-1 beta- or PMA-treated HSF cells. Distinctly, pharmacological inhibition of p38 MAPK with SB203580 was associated with transcriptional down-regulation of COX-2 and MMP-13 in the IL-1 beta- or PMA-treated HSF cells. In addition, the GS-HCl-mediated COX-2 protein modification was observed in both endogenous and PMA-induced COX-2 in HaCaT cells. Conclusions: GS-HCl differentially down-regulates COX-2 and MMP-13 expression in the IL-1 beta- or PMA-treated human skin fibroblasts via the p38 MAPK-independent COX-2 translational inhibition and the p38 MAN-dependent MMP-13 transcriptional suppression, respectively.
- 出版日期2009-10
- 单位河北医科大学
