Proteomic Profiling of Mesenchymal Stem Cell Responses to Mechanical Strain and TGF-β1Report as inadecuate

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Cellular and Molecular Bioengineering

, 2:606

First Online: 24 October 2009Received: 25 May 2009Accepted: 12 October 2009


Mesenchymal stem cells MSCs are a potential source of smooth muscle cells SMCs for constructing tissue-engineered vascular grafts. However, the details of how specific combinations of vascular microenvironmental factors regulate MSCs are not well understood. Previous studies have suggested that both mechanical stimulation with uniaxial cyclic strain and chemical stimulation with transforming growth factor-β1 TGF-β1 can induce smooth muscle markers in MSCs. In this study, we investigated the combined effects of uniaxial cyclic strain and TGF-β1 stimulation on MSCs. By using a proteomic analysis, we found differential regulation of several proteins and genes, such as the up-regulation of TGF-β1-induced protein ig-h3 BGH3 protein levels by TGF-β1 and up-regulation of calponin 3 protein level by cyclic strain. At the gene expression level, BGH3 was induced by TGF-β1, but calponin 3 was not significantly regulated by mechanical strain or TGF-β1, which was in contrast to the synergistic up-regulation of calponin 1 gene expression by cyclic strain and TGF-β1. Further experiments with cycloheximide treatment suggested that the up-regulation of calponin 3 by cyclic strain was at post-transcriptional level. The results in this study suggest that both mechanical stimulation and TGF-β1 signaling play unique and important roles in the regulation of MSCs at both transcriptional and post-transcriptional levels, and that a precise combination of microenvironmental cues may promote MSC differentiation.

KeywordsProteomics Uniaxial cyclic strain Micropatterning Gene expression Differentiation Smooth muscle cells Cell engineering  Download fulltext PDF

Author: Kyle Kurpinski - Julia Chu - Daojing Wang - Song Li


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