mr Mirzaei - Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
m mahmoodi - Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
g Hassanshahi - Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
z Ahmadi - Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran

Back ground and Aim: The OCT4B1 as a variant of OCT4 is expressed in both cancer cells and tissues. The anti-apoptotic property of this variant aid cancer cells to escape fromapoptosis. Therefore, the aim of the present study was to determine the effects of OCT4B1 suppression on regulation of 25 genes involved in anti-apoptotic pathway in tumor cell .lines Material and methods: AGS gastric adenocarcinoma , 5637 bladder tumor and U-87MG brain tumor cells were transfected with specific OCT4B1 siRNA and a scramble siRNA by siRNA silencing gene technology, using Lipofectamine 2000 commercial kit. The real-time PCR technique was employed to examine and calculate fold changes of evaluated genes .using the 2−ΔΔCT formula Results: Present results demonstrated that 22 88% of interested genes were similarly down-regulated in all three examined cell lines. Our results also indicated that three genes CASP2, IGF1R,TNF were up-regulated. The CFLAR gene was down-regulated in AGS, while it was inversely up-regulated in 5637 and U87MG cells Conclusions: It may possibly be concluded that suppression of OCT4B1 can lead to apoptosis in tumor cell lines and this is at least facilitated via down-regulation of examined anti-apoptotic genes. Accordingly, suppression of OCT4B1 may probably be considered as useful tool in cancer therapy and research