In order to study the effects of dominant negative human telomerase reverse transcriptase (DN-hTERT) on cell growth and telomerase activity in osteosarcoma cell line MG63, MG63 cells were transfected with DN-hTERT-I...In order to study the effects of dominant negative human telomerase reverse transcriptase (DN-hTERT) on cell growth and telomerase activity in osteosarcoma cell line MG63, MG63 cells were transfected with DN-hTERT-IRES2-EGFP9 (DN) or IRES2-EGF (I, blank vector) with lipofectamine 2000. The stably transfected cells were selected with G-418. Cell growth properties were examined under a fluorescence microscope. The hTERT mRNA expression was detected by reverse transcription-polymerase chain reaction (RT-PCR). Telomerase activities were measured by TRAP-ELISE. The tumorigenicity was studied with tumor xenografts by subcutaneous injection of cancer cells into nude mice. The results showed that cell growth was suppressed in MG63 cells transfected with DN-hTERT. The hTERT mRNA was increased in N-hTERT transfected-MG63 cells (MG63/DN). The telomerase activity was 2.45±0.11 in MG63/DN cells, while 3.40±0.12 in the cells transfected with blank vector (MG63/I), (P〈0.05); DN-hTERT-expressing clones did not form tumors in 2 weeks, but the ratio of tumorigenesis was 30 % in nude mice bearing MG63/I (P〈0.01). It was concluded that DN-hTERT could specifically inhibit the cell growth and telomerase activity in MG63 cells.展开更多
采用体外细胞培养,结合流式细胞术和M T T方法研究汉防己碱对M G63细胞生长的作用特点。汉防己碱(0.33Lg/mL)对M G 63细胞仅有轻度抑制作用,细胞存活率保持在88%—97%。汉防己碱浓度依赖性轻度降低cDDP对MG63细胞的IC50;低浓度T et(0.33...采用体外细胞培养,结合流式细胞术和M T T方法研究汉防己碱对M G63细胞生长的作用特点。汉防己碱(0.33Lg/mL)对M G 63细胞仅有轻度抑制作用,细胞存活率保持在88%—97%。汉防己碱浓度依赖性轻度降低cDDP对MG63细胞的IC50;低浓度T et(0.33Lg/mL)明显提升cDD P对M G63/cDDP细胞I C50,但0.5和1.0Lg/mL显著降低cD DP对M G 63/cDDP细胞的I C50。汉防己碱对M G 63/cDDP细胞则既可增加细胞耐药发展(0.33Lg/mL),也可逆转肿瘤细胞对cDDP的耐药性(1.0Lg/mL)。展开更多
文摘In order to study the effects of dominant negative human telomerase reverse transcriptase (DN-hTERT) on cell growth and telomerase activity in osteosarcoma cell line MG63, MG63 cells were transfected with DN-hTERT-IRES2-EGFP9 (DN) or IRES2-EGF (I, blank vector) with lipofectamine 2000. The stably transfected cells were selected with G-418. Cell growth properties were examined under a fluorescence microscope. The hTERT mRNA expression was detected by reverse transcription-polymerase chain reaction (RT-PCR). Telomerase activities were measured by TRAP-ELISE. The tumorigenicity was studied with tumor xenografts by subcutaneous injection of cancer cells into nude mice. The results showed that cell growth was suppressed in MG63 cells transfected with DN-hTERT. The hTERT mRNA was increased in N-hTERT transfected-MG63 cells (MG63/DN). The telomerase activity was 2.45±0.11 in MG63/DN cells, while 3.40±0.12 in the cells transfected with blank vector (MG63/I), (P〈0.05); DN-hTERT-expressing clones did not form tumors in 2 weeks, but the ratio of tumorigenesis was 30 % in nude mice bearing MG63/I (P〈0.01). It was concluded that DN-hTERT could specifically inhibit the cell growth and telomerase activity in MG63 cells.
文摘采用体外细胞培养,结合流式细胞术和M T T方法研究汉防己碱对M G63细胞生长的作用特点。汉防己碱(0.33Lg/mL)对M G 63细胞仅有轻度抑制作用,细胞存活率保持在88%—97%。汉防己碱浓度依赖性轻度降低cDDP对MG63细胞的IC50;低浓度T et(0.33Lg/mL)明显提升cDD P对M G63/cDDP细胞I C50,但0.5和1.0Lg/mL显著降低cD DP对M G 63/cDDP细胞的I C50。汉防己碱对M G 63/cDDP细胞则既可增加细胞耐药发展(0.33Lg/mL),也可逆转肿瘤细胞对cDDP的耐药性(1.0Lg/mL)。