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Insulin suppresses collagenase stimulatory effect of stratifin in dermal fibroblasts

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Abstract

A delicate balance between synthesis and degradation of extracellular matrix (ECM) by matrix metalloproteinases (MMPs) is an essential feature of tissue remodeling. We have recently demonstrated that keratinocyte releasable stratifin, also known as 14-3-3 σ protein, plays a critical role in modulating collagenase (MMP-1) mRNA expression in human dermal fibroblasts. In this study, we further characterized the collagenase stimulatory effect of stratifin in dermal fibroblasts and evaluated its effect in the presence and absence of insulin. Our data indicate that stratifin increases the expression of collagenase mRNA more than 20-fold in dermal fibroblasts, grown in either Dulbecco's modified Eagle's medium (DMEM) plus 2% or 10% fetal bovine serum (FBS). Collagenase stimulatory effect of stratifin was completely blocked, when fibroblasts were cultured in test medium consisting of 50% keratinocyte serum-free medium (KSFM) and 50% DMEM. The collagenase suppressive effect of test medium was directly proportional to the volume of KSFM used. As this medium contained insulin, we then evaluated the collagenase stimulatory effect of stratifin in dermal fibroblasts in the presence and absence of insulin. The results revealed that stratifin significantly increased the expression of collagenase mRNA/18S (*p < 0.05, n= 3) ratio, while insulin significantly decreased the expression of collagenase mRNA/18S (*p < 0.05, n= 3) ratio. The insulin inhibitory effect on collagenase mRNA expression was time and dose dependent. The maximal inhibitory effect of insulin was seen at 36 h post treatment. In conclusion, stratifin stimulates the expression of collagenase mRNA expression in dermal fibroblasts and this effect is suppressed by insulin treatment (Mol Cell Biochem 266: 167–174, 2004)

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Authors and Affiliations

  1. Department of Surgery, Wound Healing Research Group, University of Alberta, Edmonton

    Eugene Lam, Edward E. Tredget, Yvonne Marcoux, Yunyuan Li &  Ghahary

  2. Division of Plastic and Reconstructive Surgery, Division of Critical Care, University of Alberta, Edmonton, Alberta, Canada

    Edward E. Tredget

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Lam, E., Tredget, E.E., Marcoux, Y. et al. Insulin suppresses collagenase stimulatory effect of stratifin in dermal fibroblasts. Mol Cell Biochem 266, 167–174 (2004). https://doi.org/10.1023/B:MCBI.0000049156.82563.2d

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