Enhanced mesenchymal stem cell survival induced by GATA-4 overexpression is partially mediated by regulation of the miR-15 family |
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Authors: | Bin Yu Min Gong Zhisong He Yi-Gang Wang Ronald W. Millard Muhammad Ashraf Meifeng Xu |
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Affiliation: | 1. Department of Pathology and Laboratory Medicine, University of Cincinnati Medical Center, Cincinnati, OH, USA;2. Department of Pharmacology and Cell Biophysics, University of Cincinnati Medical Center, Cincinnati, OH, USA |
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Abstract: | We reported previously that pre-programming mesenchymal stem cells with the GATA-4 gene increases significantly cell survival in an ischemic environment. In this study, we tested whether regulation of microRNAs and their target proteins was associated with the cytoprotective effects of GATA-4.Methods and resultsMesenchymal stem cells were harvested from adult rat bone marrow and transduced with GATA-4 (MSCGATA-4) using the murine stem cell virus retroviral expression system. Cells transfected with empty vector (MSCNull) were used as controls. Quantitative real-time PCR data showed that the expression levels of miR-15 family members (miR-15b, miR-16, and miR-195) were significantly down-regulated in MSCGATA-4. The protein expression of Bcl-w (Bcl-2-like-2), an anti-apoptotic Bcl-2 family protein, was increased in MSCGATA-4. Hypoxic culture (low glucose and low oxygen) induced the release of lactate dehydrogenase from mesenchymal stem cells and reduced cell survival. Compared to MSCNull, MSCGATA-4 showed less lactate dehydrogenase release and greater cell survival following 72 h hypoxia exposure. The mitochondrial membrane potential, detected with the dye JC-1, was well maintained, and mitochondrial membrane permeability, expressed as caspase 3 and 7 activities in response to the ischemic environment was lower in MSCGATA-4. Moreover, transfection with miR-195 significantly down-regulated Bcl-w expression in mesenchymal stem cells through a binding site in the 3′-UTR of the Bcl-w mRNA and reduced mesenchymal stem cell resistance to ischemic injury.ConclusionsThe overexpression of GATA-4 in mesenchymal stem cells down-regulates miR-15 family members, causing increased resistance to ischemia through the up-regulation of anti-apoptotic proteins in the Bcl-2 family. |
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Keywords: | miR-15 family Bcl-w Mesenchymal stem cells Cytoprotection GATA-4 |
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