title: Overexpression of PTEN induces cell growth arrest and apoptosis in human breast cancer ZR-75-1 cells.
abstract: Phosphatase and tensin homolog (PTEN) is a tumor suppressor gene located at human chromosome 10q23, might play an important role in cell proliferation, cell cycle and apoptosis of cancer cells. In this study, the eukaryotic expression vectors pBP-wt-PTEN (containing a wild-type PTEN gene) and pBP-G129R-PTEN (containing a mutant PTEN gene) were used to transfect breast cancer ZR-75-1 cells. After transfection, ZR-75-1 cells expressing PTEN were obtained and tested. The blue exclusion assay showed the growth rate of the cells transfected with pBP-wt-PTEN was significantly lower than that of the control cells transfected with pBP-G129R-PTEN. Analysis of the cell cycle by flow cytometry showed that the progression from the G(1) to the S phase was arrested in cells expressing wild-type PTEN. Some typical morphological changes of apoptosis were also observed in cells transfected with pBP-wt-PTEN, but not in those transfected with pBP-G129R-PTEN. This study shows that overexpression of PTEN in ZR-75-1 cells leads to cell growth arrest and apoptosis.
authors.affiliation: Institute of Biochemistry and Molecular Biology, Guangdong Medical College, Zhanjiang 524023, China.
authors.forename: Xiangyong
authors.initials: X
authors.lastname: Li
authors.forename: Guanping
authors.initials: G
authors.lastname: Lin
authors.forename: Binhua
authors.initials: B
authors.lastname: Wu
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou
authors.forename: Keyuan
authors.initials: K
authors.lastname: Zhou
mesh_terms: D017209:Apoptosis / Q000235:genetics* / Q000502:physiology; D051017:Apoptosis Regulatory Proteins / Q000235:genetics*; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D005260:Female; D006801:Humans; D051059:PTEN Phosphohydrolase / Q000096:biosynthesis / Q000172:deficiency / Q000235:genetics*
chemical_list: D051017:Apoptosis Regulatory Proteins; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human