Lentiviral vector-mediated co-overexpression of VEGF and Bcl-2 improves mesenchymal stem cell survival and enhances paracrine effects in vitro

Ni,Xiaobin; Ou,Caiwen; Guo,Jingbin; Liu,Bei; Zhang,Jianwu; Wu,Zhiye; Li,Hekai; Chen,Minsheng

doi:10.3892/ijmm.2017.3019

Lentiviral vector-mediated co-overexpression of VEGF and Bcl-2 improves mesenchymal stem cell survival and enhances paracrine effects in vitro

Authors:
- Xiaobin Ni
- Caiwen Ou
- Jingbin Guo
- Bei Liu
- Jianwu Zhang
- Zhiye Wu
- Hekai Li
- Minsheng Chen
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Affiliations: Department of Cardiology, Zhujiang Hospital of Southern Medical University, Guangzhou, Guangdong 510280, P.R. China
Published online on: June 12, 2017 https://doi.org/10.3892/ijmm.2017.3019
Pages: 418-426
Copyright: © Ni et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Mesenchymal stem cell (MSC) transplantation has emerged as a promising therapy for ischemic heart disease; however, the low survival rate of transplanted cells limits their therapeutic efficacy. The aim of this study was to investigate whether the dual genetic modification of vascular endothelial growth factor (VEGF) and B‑cell lymphoma‑2 (Bcl‑2) confers a higher expression level of the target genes, better survival and a stronger paracrine effect in MSCs in an adverse environment than the modification of the individual genes. For this purpse, a lentiviral vector was constructed by using a self‑cleaving T2A peptide sequence to link and achieve the co‑overexpression of VEGF and Bcl‑2. Rat MSCs were transfected to obtain cell lines that exhibited a stable overexpression. An in vitro model of oxygen glucose deprivation (OGD) was applied to mimic the ischemic microenvironment, and cell apoptosis, autophagy and the paracrine effects were then determined. Compared with the MSCs in which individual genes were modified and the control MSCs, the MSCs which were subjected to dual genetic modification had a higher expression level of the target genes, a more rapid proliferation, reduced apoptosis, decreased autophagy and an enhanced paracrine effect. Furthermore, the suppression of autophagy was found to contribute to the inhibition of apoptosis in this in vitro OGD model. On the whole, these data indicate that the co‑overexpression of VEGF and Bcl‑2 protects MSCs in an ischemic environment by inhibiting apoptosis, suppressing autophagy and enhancing the paracrine effects.

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