The application of mixed powders with different mass fraction on laser additive repairing(LAR)can be an effective way to guarantee the performance and functionality of repaired part in time.A convenient and feasible a...The application of mixed powders with different mass fraction on laser additive repairing(LAR)can be an effective way to guarantee the performance and functionality of repaired part in time.A convenient and feasible approach is presented to repair TA15 forgings by employing Ti6Al4V-xTA15 mixed powders in this paper.The performance compatibility of Ti6Al4V-xTA15 powders from the aspects of microhardness,tensile property,heat capacity,thermal expansion coefficient and corrosion resistance with the TA15 forgings was fully investigated.The primaryαlaths were refined and the volume fraction of the secondaryαphase was increased by increasing the mass fraction of TA15 in the mixed Ti6Al4V-xTA15 powders,leading to varied performances.In conclusion,the mixed Ti6Al4V-70%TA15(x=70%)powders is the most suitable candidate and is recommended as the raw material for LAR of TA15 forgings based on overall consideration of the compatibility calculations of the laser repaired zone with the wrought substrate zone.展开更多
目的:研究抑癌基因KLF6对人前列腺癌细胞系PC-3细胞的生长增殖、细胞周期和对Bc l-2和Cyc lin D1蛋白表达的影响及其可能的作用机制。方法:利用RT-PCR法克隆目的基因KLF6,采用阳离子脂质体介导将含或不含KLF6的pEGFP-C1质粒转染入PC-3细...目的:研究抑癌基因KLF6对人前列腺癌细胞系PC-3细胞的生长增殖、细胞周期和对Bc l-2和Cyc lin D1蛋白表达的影响及其可能的作用机制。方法:利用RT-PCR法克隆目的基因KLF6,采用阳离子脂质体介导将含或不含KLF6的pEGFP-C1质粒转染入PC-3细胞,分别作为转染组和对照组。分别进行噻唑蓝(MTT)法观察PC-3细胞的生长抑制率,流式细胞仪检测细胞周期比例变化和凋亡率,免疫组化法观察PC-3细胞Bc l-2和Cyc lin D1的表达水平变化。结果:转染了抑癌基因KLF6的前列腺癌PC-3细胞生长抑制率为(30.0±5.4)%(对照组为0%,P<0.01);细胞周期比例表现为G2/M期减少为(11.2±0.9)%[对照组为(25.2±2.8)%,P<0.05],G0/G1期比例增加为(80.0±9.8)%[对照组为(58.6±7.3)%,P<0.05];细胞凋亡峰为(24.3±2.3)%[对照组为(5.2±0.7)%,P<0.01];Bc l-2的表达率为(18.7±3.2)%[对照组为(41.8±5.9)%,P<0.01];Cyc lin D1的表达率为(25.3±3.7)%[对照组为(38.5±4.6)%,P<0.05]。结论:抑癌基因KLF6的转染可以明显抑制前列腺癌PC-3细胞的生长增殖,并诱导其凋亡,其作用机制可能与下调Bc l-2和Cyc lin D1的表达有关。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
基金Project(2019-00899-1-1)supported by the Ministry of Industry and Information Technology of ChinaProject(2021JM-060)supported by the Natural Science Foundation of Shaanxi Province,ChinaProject(3102019QD0409)supported by the Fundamental Research Funds for the Central Universities,China。
文摘The application of mixed powders with different mass fraction on laser additive repairing(LAR)can be an effective way to guarantee the performance and functionality of repaired part in time.A convenient and feasible approach is presented to repair TA15 forgings by employing Ti6Al4V-xTA15 mixed powders in this paper.The performance compatibility of Ti6Al4V-xTA15 powders from the aspects of microhardness,tensile property,heat capacity,thermal expansion coefficient and corrosion resistance with the TA15 forgings was fully investigated.The primaryαlaths were refined and the volume fraction of the secondaryαphase was increased by increasing the mass fraction of TA15 in the mixed Ti6Al4V-xTA15 powders,leading to varied performances.In conclusion,the mixed Ti6Al4V-70%TA15(x=70%)powders is the most suitable candidate and is recommended as the raw material for LAR of TA15 forgings based on overall consideration of the compatibility calculations of the laser repaired zone with the wrought substrate zone.
文摘目的:研究抑癌基因KLF6对人前列腺癌细胞系PC-3细胞的生长增殖、细胞周期和对Bc l-2和Cyc lin D1蛋白表达的影响及其可能的作用机制。方法:利用RT-PCR法克隆目的基因KLF6,采用阳离子脂质体介导将含或不含KLF6的pEGFP-C1质粒转染入PC-3细胞,分别作为转染组和对照组。分别进行噻唑蓝(MTT)法观察PC-3细胞的生长抑制率,流式细胞仪检测细胞周期比例变化和凋亡率,免疫组化法观察PC-3细胞Bc l-2和Cyc lin D1的表达水平变化。结果:转染了抑癌基因KLF6的前列腺癌PC-3细胞生长抑制率为(30.0±5.4)%(对照组为0%,P<0.01);细胞周期比例表现为G2/M期减少为(11.2±0.9)%[对照组为(25.2±2.8)%,P<0.05],G0/G1期比例增加为(80.0±9.8)%[对照组为(58.6±7.3)%,P<0.05];细胞凋亡峰为(24.3±2.3)%[对照组为(5.2±0.7)%,P<0.01];Bc l-2的表达率为(18.7±3.2)%[对照组为(41.8±5.9)%,P<0.01];Cyc lin D1的表达率为(25.3±3.7)%[对照组为(38.5±4.6)%,P<0.05]。结论:抑癌基因KLF6的转染可以明显抑制前列腺癌PC-3细胞的生长增殖,并诱导其凋亡,其作用机制可能与下调Bc l-2和Cyc lin D1的表达有关。
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.
