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- Title
PEP-1-CAT-Transduced Mesenchymal Stem Cells Acquire an Enhanced Viability and Promote Ischemia-Induced Angiogenesis.
- Authors
Lei Zhang; Xiao-Wei Dong; Jia-Ning Wang; Jun-Ming Tang; Jian-Ye Yang; Ling-Yun Guo; Fei Zheng; Xia Kong; Yong-Zhang Huang; Shi-You Chen
- Abstract
Objective: Poor survival of mesenchymal stem cells (MSC) compromised the efficacy of stem cell therapy for ischemic diseases. The aim of this study is to investigate the role of PEP-1-CAT transduction in MSC survival and its effect on ischemiainduced angiogenesis. Methods: MSC apoptosis was evaluated by DAPI staining and quantified by Annexin V and PI double staining and Flow Cytometry. Malondialdehyde (MDA) content, lactate dehydrogenase (LDH) release, and Superoxide Dismutase (SOD) activities were simultaneously measured. MSC mitochondrial membrane potential was analyzed with JC-1 staining. MSC survival in rat muscles with gender-mismatched transplantation of the MSC after lower limb ischemia was assessed by detecting SRY expression. MSC apoptosis in ischemic area was determined by TUNEL assay. The effect of PEP-1-CATtransduced MSC on angiogenesis in vivo was determined in the lower limb ischemia model. Results: PEP-1-CAT transduction decreased MSC apoptosis rate while down-regulating MDA content and blocking LDH release as compared to the treatment with H2O2 or CAT. However, SOD activity was up-regulated in PEP-1-CAT-transduced cells. Consistent with its effect on MSC apoptosis, PEP-1-CAT restored H2O2-attenuated mitochondrial membrane potential. Mechanistically, PEP-1-CAT blocked H2O2-induced down-regulation of PI3K/Akt activity, an essential signaling pathway regulating MSC apoptosis. In vivo, the viability of MSC implanted into ischemic area in lower limb ischemia rat model was increased by four-fold when transduced with PEP-1-CAT. Importantly, PEP-1-CAT-transduced MSC significantly enhanced ischemia-induced angiogenesis by up-regulating VEGF expression. Conclusions: PEP-1-CAT-transduction was able to increase MSC viability by regulating PI3K/Akt activity, which stimulated ischemia-induced angiogenesis.
- Subjects
MESENCHYMAL stem cells; STEM cell treatment; ISCHEMIA; NEOVASCULARIZATION; MALONDIALDEHYDE; SUPEROXIDE dismutase
- Publication
PLoS ONE, 2012, Vol 7, Issue 12, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0052537