大鼠心肌匀浆上清液对骨髓间质干细胞诱导分化的影响

目的：探讨心肌匀浆上清液对大鼠骨髓间质干细胞（MSCs）诱导分化的影响。 方法： 体外分离培养大鼠MSCs，检测纯度。于原代培养第3 d加入自体心肌匀浆上清液持续作用1周。3周后，观察细胞形态，采用免疫细胞化学检测肌球蛋白重链和心肌特异性肌钙蛋白-T，RT-PCR方法检测Nkx2.5、α-MHC和ANP基因的表达。 结果： 大鼠MSCs经诱导后，表达肌球蛋白重链、心肌特异性肌钙蛋白-T和Nkx2.5、α-MHC基因，但未表达ANP基因，也未观察到肌管和闰盘样结构。 结论： 心肌匀浆上清液对MSCs具有定向诱导分化作用，但诱导不完全，具体机制仍需深入研究。

Effects of myocardial extracts on transdifferentiation of bone marrow-derived mesenchymal stem cells of rats

AIM: To investigate the effects of myocardial extracts of rats on transdifferentiation of bone marrow-derived mesenchymal stem cells (MSCs). METHODS: After establishing stable culture methods for rat MSCs, they were induced by high level of myocardial extracts on day 3 of primary culture for 1 week. Immunocytochemistry technique was used to detect MHC and troponin-T, and the expression of Nkx2.5, α-MHC and ANP genes were identified by RT-PCR technique 3 weeks later. RESULTS: MSCs of rats expressed cardiac MHC and troponin-T proteins, Nkx2.5 and α-MHC genes after induction. However, they neither expressed ANP gene nor formed myotubes and intercalated disk. CONCLUSION: Myocardial extracts can induce MSCs to transdifferentiate into cardiomyocytes.