Effect of estrogen receptor 2 on the cell proliferation in prostate cancer cell line PC-3M

AIM: To construct the recombination plasmid pcDNA3.1-hERβ with the human estrogen receptor 2(ESR2) full length cDNA and transfect it into hormone-independent prostate cancer PC-3M cell line,and to study the effects of ESR2 on proliferation in transfected cells.METHODS: The complete cDNA of ESR2 was obtained from human ovary tissue by RT-PCR technique and cloned into eukaryotic expression vector pcDNA3.1 by using gene recombination technique to construct the pcDNA3.1-hERβ recombination plasmid.The plasmid was detected by endonuclease digestion and DNA sequencing and was transfected into PC-3M cells.MTT and FCAS assay were used to test the effects of ESR2 on the ability of proliferation in PC-3M cells.RT-PCR and Western blotting were used to detect the expressions of cyclinD1 and P21Cip1.RESULTS: The results of sequencing and endonuclease digestion demonstrated that the construction of pcDNA3.1-hERβ recombination plasmid was successful.The sequence analysis suggested that the ESR2 sequence detected by PCR was identical to that published in GenBank,and the product of endonuclease was as long as the complete human ESR2 gene.48 h after transfected the pcDNA3.1-hERβ into PC-3M cells,the expression of ESR2 mRNA and protein levels increased significantly detected by RT-PCR and Western blotting.Compared to the cells transfected with vector as control,the PC-3M cells transfected with pcDNA3.1-hERβ showed that cell population decreased and proliferation activity degraded.FCAS showed that the cells in G0/G1 stage increased and in S stage or G2/M stage decreased.RT-PCR and Western blotting showed that the expression of cyclinD1 gene reduced and expression of P21Cip1 increased.CONCLUSION: The recombination of plasmid pcDNA3.1-hERβ is constructed and transfected into the PC-3M cells successfully.The activity of cell proliferation is inhibited after pcDNA3 transfection.1-hERβ.It is possible that ESR2 inhibits cell proliferation by the expression of proliferation related genes cyclinD1 and P21Cip1.