期刊
STEM CELL RESEARCH & THERAPY
卷 6, 期 -, 页码 -出版社
BMC
DOI: 10.1186/s13287-015-0085-2
关键词
-
资金
- National Natural Science Foundation of China [81160020, 81170121]
- Chinese Ministry of Education [212137]
- Technology Innovation Project of Department of Education of Guangdong Province [2013KJCX0088]
- Hainan provincial Special Fund for Social Development [SF201417]
- Hainan International Cooperation Project [HJHZ2013-06]
- Excellent Graduate Student Training Program of Guangdong Medical University [YS2014013]
Introduction: Transplantation of bone marrow mesenchymal stem cells (BMSCs) can repair injured hearts. However, whether BMSC populations contain cells with cardiac stem cell characteristics is ill-defined. We report here that Notch signalling can promote differentiation of c-Kit(POS)/NKX2.5(POS) BMSCs into cardiomyocyte-like cells. Methods: Total BMSCs were isolated from Sprague-Dawley rat femurs and c-Kit(POS) cells were purified. c-Kit(POS)/NKX2.5(POS) cells were isolated by single-cell cloning, and the presence of cardiomyocyte, smooth muscle cell (SMC), and endothelial cell differentiation markers assessed by immunofluorescence staining and semi-quantitative reverse-transcription polymerase chain reaction (RT-PCR) analysis. Levels of c-Kit and Notch1-4 in total BMSCs and c-Kit(POS)/NKX2.5(POS) BMSCs were quantitated by flow cytometry. Following infection with an adenovirus over-expressing Notch1 intracellular domain (NICD), total BMSCs and c-Kit(POS)/NKX2.5(POS) cells were assessed for differentiation to cardiomyocyte, SMC, and endothelial cell lineages by immunofluorescence staining and real-time quantitative RT-PCR. Total BMSCs and c-Kit(POS)/NKX2.5(POS) cells were treated with the Notch1 ligand Jagged1 and markers of cardiomyocyte, SMC, and endothelial cell differentiation were examined by immunofluorescence staining and real-time quantitative RT-PCR analysis. Results: c-Kit(POS)/NKX2.5(POS) cells were present among total BMSC populations, and these cells did not express markers of adult cardiomyocyte, SMC, or endothelial cell lineages. c-Kit(POS)/NKX2.5(POS) BMSCs exhibited a multi-lineage differentiation potential similar to total BMSCs. Following sorting, the c-Kit level in c-Kit(POS)/NKX2.5(POS) BMSCs was 84.4%. Flow cytometry revealed that Notch1 was the predominant Notch receptor present in total BMSCs and c-Kit(POS)/NKX2.5(POS) BMSCs. Total BMSCs and c-Kit(POS)/NKX2.5(POS) BMSCs overexpressing NICD had active Notch1 signalling accompanied by differentiation into cardiomyocyte, SMC, and endothelial cell lineages. Treatment of total BMSCs and c-Kit(POS)/NKX2.5(POS) BMSCs with exogenous Jagged1 activated Notch1 signalling and drove multi-lineage differentiation, with a tendency towards cardiac lineage differentiation in c-Kit(POS)/NKX2.5(POS) BMSCs. Conclusions: c-Kit(POS)/NKX2.5(POS) cells exist in total BMSC pools. Activation of Notch1 signalling contributed to multi-lineage differentiation of c-Kit(POS)/NKX2.5(POS) BMSCs, favouring differentiation into cardiomyocytes. These findings suggest that modulation of Notch1 signalling may have potential utility in stem cell translational medicine.
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