BACKGROUND: We investigated the roles of stem cell factor (SCF)-c-kit and stromal derived factor-1 (SDF-1)-CXCR4 signaling axes in transmyocardial revascularization (TMR)-enhanced engraftment of transplanted bone marrow stem cells (BMSCs) in infarcted hearts. METHODS: 3 weeks after LAD ligation, female Lewis rats underwent 10-channel needle-TMR, followed by daily IV injections of 1 million male donor BMSC for 5 days, either wild type (WT) or with knockdown (K/D) of c-kit or CXCR4, accomplished via a shRNA + plasmid in a lentiviral vector (N = 6/group). RESULTS: In our rat infarct model, 3 days after last BMSC injection, the number of BMSCs that homed into infarct was affected by both TMR and donor cell type, with greater BMSC engraftment with TMR and with WT BMSC (TMR, cell type, and interaction, P < 0.05). At 1 week, these differences persisted (TMR and cell type, P < 0.05). At 3 days, TMR significantly upregulated transcription of c-kit (TMR, p < 0.05), SCF (TMR and cell type, P < 0.05), CXCR4 (TMR and cell type, p < 0.05), and SDF-1 (TMR and cell type, P < 0.05). At 1 week, we saw similar declines in expression of c-kit (cell type, P < 0.05), SCF (TMR, P < 0.05), CXCR4 (TMR and cell type, P < 0.05), and SDF-1 (TMR, P < 0.05). At 1 week, TMR improved LV ejection fraction (LVEF) (N = 5) when WT BMSCs were infused, but knockdown of either c-kit or CXCR4 completely abrogated this TMR-mediated augmentation of BMSC reparative effect (TMR and cell type, P < 0.05). CONCLUSIONS: Downregulation of either c-kit or CXCR4 in BMSC decreased engraftment of circulating BMSC and inhibited reparative effects of TMR.
BACKGROUND: We investigated the roles of stem cell factor (SCF)-c-kit and stromal derived factor-1 (SDF-1)-CXCR4 signaling axes in transmyocardial revascularization (TMR)-enhanced engraftment of transplanted bone marrow stem cells (BMSCs) in infarcted hearts. METHODS: 3 weeks after LAD ligation, female Lewis rats underwent 10-channel needle-TMR, followed by daily IV injections of 1 million male donor BMSC for 5 days, either wild type (WT) or with knockdown (K/D) of c-kit or CXCR4, accomplished via a shRNA + plasmid in a lentiviral vector (N = 6/group). RESULTS: In our ratinfarct model, 3 days after last BMSC injection, the number of BMSCs that homed into infarct was affected by both TMR and donor cell type, with greater BMSC engraftment with TMR and with WT BMSC (TMR, cell type, and interaction, P < 0.05). At 1 week, these differences persisted (TMR and cell type, P < 0.05). At 3 days, TMR significantly upregulated transcription of c-kit (TMR, p < 0.05), SCF (TMR and cell type, P < 0.05), CXCR4 (TMR and cell type, p < 0.05), and SDF-1 (TMR and cell type, P < 0.05). At 1 week, we saw similar declines in expression of c-kit (cell type, P < 0.05), SCF (TMR, P < 0.05), CXCR4 (TMR and cell type, P < 0.05), and SDF-1 (TMR, P < 0.05). At 1 week, TMR improved LV ejection fraction (LVEF) (N = 5) when WT BMSCs were infused, but knockdown of either c-kit or CXCR4 completely abrogated this TMR-mediated augmentation of BMSC reparative effect (TMR and cell type, P < 0.05). CONCLUSIONS: Downregulation of either c-kit or CXCR4 in BMSC decreased engraftment of circulating BMSC and inhibited reparative effects of TMR.
Authors: Dongming Hou; Eyas Al-Shaykh Youssef; Todd J Brinton; Ping Zhang; Pamela Rogers; Erik T Price; Alan C Yeung; Brian H Johnstone; Paul G Yock; Keith L March Journal: Circulation Date: 2005-08-30 Impact factor: 29.690
Authors: Min Cheng; Junlan Zhou; Min Wu; Chan Boriboun; Tina Thorne; Ting Liu; Zhifu Xiang; Qiutang Zeng; Toshikazu Tanaka; Yao Liang Tang; Raj Kishore; Michael H Tomasson; Richard J Miller; Douglas W Losordo; Gangjian Qin Journal: Circ Res Date: 2010-09-16 Impact factor: 17.367
Authors: Dan Spiegelstein; Christopher Kim; Yaoguang Zhang; Guangming Li; Richard D Weisel; Ren-Ke Li; Terrence M Yau Journal: Am J Physiol Heart Circ Physiol Date: 2007-09-07 Impact factor: 4.733