Objective To analyze the changes of gene expression profiles during the process that human bone
marrow mesenchymal stem cells (hBMSCs) are induced to differentiate into cardiomyogenic cells with 5-azacytidine (5-
aza). Methods hBMSCs were isolated from marrow of obsolete ribs and induced with 5-aza. Then immunocytochemical
staining was used to detect the expressions of α-actin, cardiac troponin T (cTnT), and connexin 43, and the percentage of
cTnT positive cells was tested with flow cytometry. In the process of differentiation, variation of gene expression was screened
with Genechi ps Operating System of human gene expression profiles. And the differentially expressed genes were functionally
analyzed and hierarchical clustered. Results When BMSCs were induced in vitro with 5-aza, part of the cells turned
into myogenic cells morphologically. Before induction, immunocytochemical staining for α-actin and cTnT showed sl ight
positive and for connexin 43 showed negative. While after 3 weeks of induction, immunocytochemical staining for α-actin,
cTnT, and connexin 43 showed all positive. With flow cytometry, the percentage of cTnT positive cells was 7.43% ± 0.02%
before induction, but it was 49.64% ± 0.05% after induction. During differentiation, 1 814 differentially expressed genes
were reported by gene chi ps. Of them, 647 genes were divided into 5 groups with hierarchical clustering. They had various
biological functions, involving signal transduction, cell metabol ism, prol iferation, differentiation, development, and
topogenesis. Conclusion hBMSCs can differentiate into cardiomyogenic cells with the induction of 5-aza in vitro. Multi ple
genes related with signal transduction, transcri ption, and growth factors are involved during this process.
Citation: YANG Lin,SHEN Ti,CHEN Lianfeng,CAO Xinxin,LAI Jinzhi.. DYNAMIC CHANGES OF GENE EXPRESSION PROFILES DURING CARDIOMYOGENESIS OF HUMANMARROW MESENCHYMAL STEM CELLS/. Chinese Journal of Reparative and Reconstructive Surgery, 2012, 26(5): 607-611. doi: Copy