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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: BACKGROUND, OBJECTIVE, METHODS, RESULTS. Meshes: Carbazoles, Cells, Cultured, Enzyme Inhibitors, Fibroblasts, Gene Expression Regulation, Enzymologic, Gene Knockdown Techniques, Humans, Matrix Metalloproteinase 1, Matrix Metalloproteinase 3, Matrix Metalloproteinases, RNA, Small Interfering, Reverse Transcriptase Polymerase Chain Reaction, Sirtuin 1, Skin.
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Does sIRT1 modulate expression of matrix metalloproteinases in human dermal fibroblasts? Context: SIRT1, an NAD(+) -dependent histone/protein deacetylase, controls a broad range of cellular functions. We examined if SIRT1 is involved in the regulation of matrix metalloproteinase (MMP) expression in human dermal fibroblasts. We studied the effect of inhibition of SIRT1 by specific inhibitor and small interfering RNA (siRNA) on MMP-1 and MMP-3 expression in human dermal fibroblasts. Treatment with a potent and selective inhibitor of SIRT1, EX-527, increased the basal expression levels of MMP-1 and MMP-3 proteins. Knockdown of endogenous SIRT1 by siRNA led to increased expression of MMP-1 and MMP-3 at both mRNA and protein levels. SIRT1 knockdown also upregulated MMP protein induction caused by an inflammatory cytokine, interleukin (IL)-1β. Moreover, treatment with a SIRT1 activator, resveratrol, significantly suppressed IL-1β-mediated induction of MMP-1, which was attenuated by pretreatment with EX-527. Finally, MMP-1 promoter activity was increased by EX-527 in cells treated with or without IL-1β.
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Our findings suggest that SIRT1 exerts a negative regulatory role in the production of MMP-1 and MMP-3 in human dermal fibroblasts. Final Decision: yes