ABSTRACT
Objective To observe whether mesenchymal stem cells(MSCs) which have been induced by 5-azacytidine(5-aza) can differentiate into cardiac like cells. To find out the role of TITIN playing during the development of cardiomycytes among structure proteins. Methods To establish a recombinant plasmid vector involving a shRNA which matching the base pair of rat TITIN N2B region mRNA perfectly,transfect it into normal neonatal cardiomyocytes and MSCs which have been induced by 5-aza respectively and investigate the expression of TITIN Z band,MHC,ACTIN as well as cTnT by immunofluorescence. Results The expression of TITIN was weakened after recombinant plasmid has been transfected into neonatal cardiomyocytes.The same thing happened upon MSCs that have been induced by 5-aza. The expression of cTnT was weakened after TITIN been silenced by small interfering RNA (siRNA). But there was obvious change in MHC and ACTIN. Conclusion Our results demonstrate that MSCs can be induced into cardiomyocyte-like cells by 5-aza in vitro,although the degree of differentiation is still lower and can not form intact contractive structure. TITIN plays an important role in the development of structure proteins.