摘要
The full length cDNA coding for P15 INK4b, which is a cyclin-dependent kinase inhibitor, was cloned to plasmid PXJ41-neo (Eco R I IXho 1 site) and the new constructed plasmid pXJp15 was obtained. pXJp15 was transferred into the human hepatoma SMMC-7721 cells by lipofectine reagent. After G418 selection, a series of cell lines stably expressing high levels of P15 (named SHT) and the clone containing vector PXJ41-neo only (named SVXJ) were obtained by Northern and Western analysis. The results showed that the proliferation of SHT cells is inhibited compared with that of SVXJ cells. Cell cycle analysis indicated that overexpressing of P15 inhibited the growth of SHT cells by decreasing progrssion of cells from G1 to S and G2 to M phases. The levels of c-Myc and c-Fos were obviously decreased in SHT cells compared with control cells by Western blotting. The decreased expression of oncogene may be one of the molecular mechanisms of the effect of P15 on the proliferation of in SHT cells.
The full length cDNA coding for P15 INK4b, which is a cyclin-dependent kinase inhibitor, was cloned to plasmid PXJ41-neo (Eco R I IXho 1 site) and the new constructed plasmid pXJp15 was obtained. pXJp15 was transferred into the human hepatoma SMMC-7721 cells by lipofectine reagent. After G418 selection, a series of cell lines stably expressing high levels of P15 (named SHT) and the clone containing vector PXJ41-neo only (named SVXJ) were obtained by Northern and Western analysis. The results showed that the proliferation of SHT cells is inhibited compared with that of SVXJ cells. Cell cycle analysis indicated that overexpressing of P15 inhibited the growth of SHT cells by decreasing progrssion of cells from G1 to S and G2 to M phases. The levels of c-Myc and c-Fos were obviously decreased in SHT cells compared with control cells by Western blotting. The decreased expression of oncogene may be one of the molecular mechanisms of the effect of P15 on the proliferation of in SHT cells.
作者
ZHANG Hong, LIU Huitu & SHI Fawu1. Key Laboratory of Cell Proliferation and Regulation Biology, Beijing Normal University, Beijing 100875, China
2. Institute of Basic Medical Science, General Hospital of People’s Liberation Army LA, Beijing 100039, China
3. Institute of Medical Information, Medical Academy of China, Beijing 100020, China Correspondence should be addressed to Liu Huitu
