Objective: To investigate the expression of tumor necrosis factor-related apoptosis-inducing ligand(TRAIL) and its receptors in primary hepatic carcinoma(PHC) and the apoptosis-inducing effect on hepatoma cell line He...Objective: To investigate the expression of tumor necrosis factor-related apoptosis-inducing ligand(TRAIL) and its receptors in primary hepatic carcinoma(PHC) and the apoptosis-inducing effect on hepatoma cell line HepG2. Methods: TRAIL and its receptors were detected by semiquantitive RT-PCR in 30 PHC and para-carcinoma tissues and two hepatoma cell lines of HepG2 and SMMC-7721. HepG2 cells were treated with human recombinant soluble TRAIL protein (HrsTRAIL) and then the viability of HepG2 cells was measured by microculture tetrazolium dye(MTT) assay and apoptosis index was demonstrated by fluorescence-activated cell sorting(FACS). Results:TRAIL and its receptors were detectable in all PHC and para-carcinoma tissues and hepatoma cell line HepG2. TRAIL, death receptor 4(DR4), DR5, and decoy receptor 2(DcR2) but not DcR1 were detectable in hepatoma cell line SMMC-7721. The expression patterns of TRAIL receptors in HepG2 were quite similar to PHC specimens. The semiquantitive results showed that the expression level of TRAIL and DcR were lower but DR was higher in hepatoma tissues than in para-carcinoma tissues. In PHC tissues, the expressions of DR were higher than DcR, while there was no difference in para-carcinoma tissues. HrsTRAIL had potent antitumor activity in a time- and dose-dependent manner. After co-incubations of the HepG2 cells in the presence of HrsTRAIL at concentration 1 000 ng/ml for 24 hours, the viability of HepG2 cells decreased to 45% and the apoptosis index reached 51%. Conclusion:TRAIL and its receptors were expressed in both PHC tissues and para-carcinoma tissues but the expression levels were different. The lower expression of TRAIL in PHC tissues suggested that insufficient apoptosis occured in the development of PHC. High expression of DR in PHC tissues may be a self-defense mechanism and may afford a theory of HrsTRAIL therapy for PHC. HrsTRAIL may be a potential cytotoxic drug for PHC, and it can kill majority of HepG2 cells, but minority of HepG2 were resistant to TRAIL-inducing apoptosis.展开更多
目的探讨靛玉红衍生物PHⅡ-7联合肿瘤坏死因子相关凋亡诱导配体(TRAIL)对乳腺癌细胞MCF-7及其耐药株MCF-7/ADR的增殖及调节TRAIL受体表达的相关机制。方法采用MTT法,分别检测PHⅡ-7、TRAIL及低浓度PHⅡ-7联合TRAIL处理MCF-7、MCF-7/ADR...目的探讨靛玉红衍生物PHⅡ-7联合肿瘤坏死因子相关凋亡诱导配体(TRAIL)对乳腺癌细胞MCF-7及其耐药株MCF-7/ADR的增殖及调节TRAIL受体表达的相关机制。方法采用MTT法,分别检测PHⅡ-7、TRAIL及低浓度PHⅡ-7联合TRAIL处理MCF-7、MCF-7/ADR细胞的生长抑制率,同时以TRAIL敏感细胞MDA-MB-231为对照,证实上述乳腺癌细胞对TRAIL的敏感性;采用流式细胞术检测细胞凋亡和药物作用后活性氧的产生情况;real time PCR检测PHⅡ-7以及PHⅡ-7和活性氧抑制剂NAC联用后,乳腺癌细胞TRAIL功能性受体DR4、DR5的表达情况。结果 PHⅡ-7作用24 h后对MCF-7及MCF-7/ADR的IC50分别为(4.49±1.55)、(3.44±0.90)μmol·L-1,TRAIL可诱导MDA-MB-231细胞凋亡,而MCF-7、MCF-7/ADR对TRAIL极不敏感,各浓度组与MDA-MB-231相比差异具有统计学意义(P<0.05);低浓度PHⅡ-7联合TRAIL可有效促进TRAIL对MCF-7、MCF-7/ADR的杀伤并诱导凋亡,而两药单用对上述细胞的增殖抑制作用有限;此外,低浓度的PHⅡ-7还对人正常细胞PBMC的毒性很小,即使与TRAIL联用,在该浓度范围下也不会对正常组织细胞产生明显毒性;PHⅡ-7可有效诱导MCF-7及MCF-7/ADR细胞内活性氧的产生,同时上调TRAIL受体DR4、DR5的水平,并呈剂量依赖性。当PHⅡ-7与ROS抑制剂NAC联用时,可有效抑制PHⅡ-7对DR4、DR5的表达上调作用。结论低浓度的PHⅡ-7可有效增强乳腺癌细胞MCF-7、MCF-7/ADR对TRAIL治疗的敏感性,其机制可能是通过PHⅡ-7升高细胞内的活性氧水平进而上调TRAIL受体DR4、DR5表达而实现的。本研究为今后PHⅡ-7联合TRAIL治疗方案的临床应用奠定了基础。展开更多
基金We thank Drs Hongbing Shu （Wuhan University, China）, Jiandong Li （University of Rochester Medical Center, USA）, Andrew Thorbum （University of Colorado Comprehensive Cancer Center, USA） and Andreas Strasser （The Walter and Eliza Hall Institute of Medical Research, Australia） for the generous gifts of the constructs. This work was partially supported by the National Natural Science Foundation of China （Grants 30571687 and 30721063） and the State Key Basic Research Program of China （Grant 2007CB507404）.
文摘Objective: To investigate the expression of tumor necrosis factor-related apoptosis-inducing ligand(TRAIL) and its receptors in primary hepatic carcinoma(PHC) and the apoptosis-inducing effect on hepatoma cell line HepG2. Methods: TRAIL and its receptors were detected by semiquantitive RT-PCR in 30 PHC and para-carcinoma tissues and two hepatoma cell lines of HepG2 and SMMC-7721. HepG2 cells were treated with human recombinant soluble TRAIL protein (HrsTRAIL) and then the viability of HepG2 cells was measured by microculture tetrazolium dye(MTT) assay and apoptosis index was demonstrated by fluorescence-activated cell sorting(FACS). Results:TRAIL and its receptors were detectable in all PHC and para-carcinoma tissues and hepatoma cell line HepG2. TRAIL, death receptor 4(DR4), DR5, and decoy receptor 2(DcR2) but not DcR1 were detectable in hepatoma cell line SMMC-7721. The expression patterns of TRAIL receptors in HepG2 were quite similar to PHC specimens. The semiquantitive results showed that the expression level of TRAIL and DcR were lower but DR was higher in hepatoma tissues than in para-carcinoma tissues. In PHC tissues, the expressions of DR were higher than DcR, while there was no difference in para-carcinoma tissues. HrsTRAIL had potent antitumor activity in a time- and dose-dependent manner. After co-incubations of the HepG2 cells in the presence of HrsTRAIL at concentration 1 000 ng/ml for 24 hours, the viability of HepG2 cells decreased to 45% and the apoptosis index reached 51%. Conclusion:TRAIL and its receptors were expressed in both PHC tissues and para-carcinoma tissues but the expression levels were different. The lower expression of TRAIL in PHC tissues suggested that insufficient apoptosis occured in the development of PHC. High expression of DR in PHC tissues may be a self-defense mechanism and may afford a theory of HrsTRAIL therapy for PHC. HrsTRAIL may be a potential cytotoxic drug for PHC, and it can kill majority of HepG2 cells, but minority of HepG2 were resistant to TRAIL-inducing apoptosis.
文摘目的探讨靛玉红衍生物PHⅡ-7联合肿瘤坏死因子相关凋亡诱导配体(TRAIL)对乳腺癌细胞MCF-7及其耐药株MCF-7/ADR的增殖及调节TRAIL受体表达的相关机制。方法采用MTT法,分别检测PHⅡ-7、TRAIL及低浓度PHⅡ-7联合TRAIL处理MCF-7、MCF-7/ADR细胞的生长抑制率,同时以TRAIL敏感细胞MDA-MB-231为对照,证实上述乳腺癌细胞对TRAIL的敏感性;采用流式细胞术检测细胞凋亡和药物作用后活性氧的产生情况;real time PCR检测PHⅡ-7以及PHⅡ-7和活性氧抑制剂NAC联用后,乳腺癌细胞TRAIL功能性受体DR4、DR5的表达情况。结果 PHⅡ-7作用24 h后对MCF-7及MCF-7/ADR的IC50分别为(4.49±1.55)、(3.44±0.90)μmol·L-1,TRAIL可诱导MDA-MB-231细胞凋亡,而MCF-7、MCF-7/ADR对TRAIL极不敏感,各浓度组与MDA-MB-231相比差异具有统计学意义(P<0.05);低浓度PHⅡ-7联合TRAIL可有效促进TRAIL对MCF-7、MCF-7/ADR的杀伤并诱导凋亡,而两药单用对上述细胞的增殖抑制作用有限;此外,低浓度的PHⅡ-7还对人正常细胞PBMC的毒性很小,即使与TRAIL联用,在该浓度范围下也不会对正常组织细胞产生明显毒性;PHⅡ-7可有效诱导MCF-7及MCF-7/ADR细胞内活性氧的产生,同时上调TRAIL受体DR4、DR5的水平,并呈剂量依赖性。当PHⅡ-7与ROS抑制剂NAC联用时,可有效抑制PHⅡ-7对DR4、DR5的表达上调作用。结论低浓度的PHⅡ-7可有效增强乳腺癌细胞MCF-7、MCF-7/ADR对TRAIL治疗的敏感性,其机制可能是通过PHⅡ-7升高细胞内的活性氧水平进而上调TRAIL受体DR4、DR5表达而实现的。本研究为今后PHⅡ-7联合TRAIL治疗方案的临床应用奠定了基础。
