Objective: To investigate the inhibitory effect of apogossypolone (ApoG2) on prostate cancer cell line PC-3 in vivo, and explore its mechanism. Methods: The models of transplantation tumors in Balb/c nu/nu mice were e...Objective: To investigate the inhibitory effect of apogossypolone (ApoG2) on prostate cancer cell line PC-3 in vivo, and explore its mechanism. Methods: The models of transplantation tumors in Balb/c nu/nu mice were established via subcutaneous injection of PC-3 cells and the tumor-transplanted mice were divided into 4 groups: control group and three ApoG2 treatment groups, with 10 mice in each group. Volumes of the tumor were estimated every 2 d and the morphology of tumor tissues was observed. Immunohistochemistry was employed to observe the expression of Bcl-2, PCNA, CD31, caspase-3 and caspase-8 in tumor tissues. Results: ApoG2 (2.5 mg/kg-10 mg/kg) given intraperitoneally once a day can obviously inhibit the growth of subcutaneous prostatic carcinoma implant. The tumor volume decreased obviously when the treatment dosage was bigger than 5.0 mg/kg (P<0.01). Meanwhile, ApoG2 decreased the expression of PCNA and CD31, and enhanced the expression of caspases-3, caspase-8 in tumor tissues. Conclusion: ApoG2 exert an inhibitory effect on prostatic carcinoma possibly by inducing apoptosis and inhibiting tumor angiogenesis.展开更多
Objective To investigate the effect of IL-6 on prostatic carcinoma cell lines, and differential effects on androgen-dependent and androgen-independent prostatic carcinoma cells. Methods The IL-6 producing capacities o...Objective To investigate the effect of IL-6 on prostatic carcinoma cell lines, and differential effects on androgen-dependent and androgen-independent prostatic carcinoma cells. Methods The IL-6 producing capacities of LNCaP and PC-3 cells were determined, and effects of exogenous IL-6 and anti-IL - 6 antibodies on LNCaP and PC - 3 cells were examined. Results LNCaP produced a very small amount of IL-6, but PC-3 produced more, the concentraion of IL-6 being 190 pg/48 h per ml(1 × 106). The exogenous IL-6 inhibited LNCaP growth significantly,but had no obvious effect on PC -3 cells. Anti-IL-6 antibodies lowered PC-3 cells growth rate but had neutral effect on LNCaP. Conclusion PC-3 cells produces IL-6 massively in autocrine manner. IL-6 could be antagonized by anti-IL-6 antibodies,resulting in slowing PC-3 cells growth, and LNCaP cells growth could be inhibited by exogenous IL-6.7 refs,2 tabs.展开更多
Aim： To investigate the possible role of manganese in the regulation of mitochondrial aconitase （mACON） activity human prostate carcinoma cell line PC-3 cells. Methods： The mACON enzymatic activities of human pros...Aim： To investigate the possible role of manganese in the regulation of mitochondrial aconitase （mACON） activity human prostate carcinoma cell line PC-3 cells. Methods： The mACON enzymatic activities of human prostate carcinoma cell line PC-3 cells were determined using a reduced nicotinamide adenine dinucleotide-coupled assay. Immunoblot and transient gene expression assays were used to study gene expression of the mACON. The putative response element for gene expression was identified using reporter assays with site-directed mutagenesis and electrophoretic mobility-shift assays. Results： In vitro study revealed that manganese chloride （MnCI2） treatment for 16 h inhibited the enzymatic activity of mACON, which induced the inhibition of citrate utility and cell proliferation of PC- 3 cells. Although results from transient gene expression assays showed that MnCI2 treatment upregulated gene translation by approximately 5-fold through the iron response element pathway, immunoblot and reporter assays showed that MnCl2 treatments inhibited protein and gene expression of mACON. This effect was reversed by cotreatment with ferric ammonium citrate. Additional reporter assays with site-directed mutagenesis and electrophoretic mobility-shift assays suggested that a putative metal response element in the promoter of the mACON gene was involved in the regulation of MnCh on the gene expression of mACON. Conclusion： These findings suggest that manganese acts as an antagonist of iron, disrupting the enzymatic activity and gene expression of mACON and citrate metabolism in the prostate.展开更多
文摘Objective: To investigate the inhibitory effect of apogossypolone (ApoG2) on prostate cancer cell line PC-3 in vivo, and explore its mechanism. Methods: The models of transplantation tumors in Balb/c nu/nu mice were established via subcutaneous injection of PC-3 cells and the tumor-transplanted mice were divided into 4 groups: control group and three ApoG2 treatment groups, with 10 mice in each group. Volumes of the tumor were estimated every 2 d and the morphology of tumor tissues was observed. Immunohistochemistry was employed to observe the expression of Bcl-2, PCNA, CD31, caspase-3 and caspase-8 in tumor tissues. Results: ApoG2 (2.5 mg/kg-10 mg/kg) given intraperitoneally once a day can obviously inhibit the growth of subcutaneous prostatic carcinoma implant. The tumor volume decreased obviously when the treatment dosage was bigger than 5.0 mg/kg (P<0.01). Meanwhile, ApoG2 decreased the expression of PCNA and CD31, and enhanced the expression of caspases-3, caspase-8 in tumor tissues. Conclusion: ApoG2 exert an inhibitory effect on prostatic carcinoma possibly by inducing apoptosis and inhibiting tumor angiogenesis.
文摘Objective To investigate the effect of IL-6 on prostatic carcinoma cell lines, and differential effects on androgen-dependent and androgen-independent prostatic carcinoma cells. Methods The IL-6 producing capacities of LNCaP and PC-3 cells were determined, and effects of exogenous IL-6 and anti-IL - 6 antibodies on LNCaP and PC - 3 cells were examined. Results LNCaP produced a very small amount of IL-6, but PC-3 produced more, the concentraion of IL-6 being 190 pg/48 h per ml(1 × 106). The exogenous IL-6 inhibited LNCaP growth significantly,but had no obvious effect on PC -3 cells. Anti-IL-6 antibodies lowered PC-3 cells growth rate but had neutral effect on LNCaP. Conclusion PC-3 cells produces IL-6 massively in autocrine manner. IL-6 could be antagonized by anti-IL-6 antibodies,resulting in slowing PC-3 cells growth, and LNCaP cells growth could be inhibited by exogenous IL-6.7 refs,2 tabs.
文摘Aim： To investigate the possible role of manganese in the regulation of mitochondrial aconitase （mACON） activity human prostate carcinoma cell line PC-3 cells. Methods： The mACON enzymatic activities of human prostate carcinoma cell line PC-3 cells were determined using a reduced nicotinamide adenine dinucleotide-coupled assay. Immunoblot and transient gene expression assays were used to study gene expression of the mACON. The putative response element for gene expression was identified using reporter assays with site-directed mutagenesis and electrophoretic mobility-shift assays. Results： In vitro study revealed that manganese chloride （MnCI2） treatment for 16 h inhibited the enzymatic activity of mACON, which induced the inhibition of citrate utility and cell proliferation of PC- 3 cells. Although results from transient gene expression assays showed that MnCI2 treatment upregulated gene translation by approximately 5-fold through the iron response element pathway, immunoblot and reporter assays showed that MnCl2 treatments inhibited protein and gene expression of mACON. This effect was reversed by cotreatment with ferric ammonium citrate. Additional reporter assays with site-directed mutagenesis and electrophoretic mobility-shift assays suggested that a putative metal response element in the promoter of the mACON gene was involved in the regulation of MnCh on the gene expression of mACON. Conclusion： These findings suggest that manganese acts as an antagonist of iron, disrupting the enzymatic activity and gene expression of mACON and citrate metabolism in the prostate.
