Objective： To investigate the expression of hergl gene in tumor tissues from gastric carcinomas and gastric carcinoma cell lines, and study the relationship between HERG K＋ channel expressions and tumor cell prolife...Objective： To investigate the expression of hergl gene in tumor tissues from gastric carcinomas and gastric carcinoma cell lines, and study the relationship between HERG K＋ channel expressions and tumor cell proliferation and apoptosis. Methods： RT-PCR and PCR assays were used to detect the expression of hergl gene in 64 gastric carcinomas and the gastric cancer cell line SGC-7901. Blocking the HERG K＋ channels was used to evaluate their effects on tumor cell proliferation and apoptosis. Results：The statistically significant expression of hergl gene was detected in all the gastric cancers and SGC-7901 cells, but not in normal tissues. The HERG K＋ channel blocker, E-4031, increased the cell population in G0/G1（P 〈 0.05） and the number of apoptotic tumor cells（P 〈 0.05）. Conclusion： HERG K＋ channels were expressed in all gastric carcinomas tested and these channels appear to modulate tumor cell proliferation and apoptosis.展开更多
In order to investigate the expression and functional role of HERG1 K+ channels in leukemic cells and leukemic stem cells (LSCs), RT-PCR was used to detect the HERG1 K+ channels expression in leukemic cells and LSCs. ...In order to investigate the expression and functional role of HERG1 K+ channels in leukemic cells and leukemic stem cells (LSCs), RT-PCR was used to detect the HERG1 K+ channels expression in leukemic cells and LSCs. The functional role of HERG1 K+ channels in leukemic cell proliferation was measured by MTT assay, and cell cycle and apoptosis were analyzed by flow cy- tometry. The results showed that herg mRNA was expressed in CD34+/CD38-, CD123+ LSCs but not in circulating CD34+ cells. Herg mRNA was also up-regulated in leukemia cell lines K562 and HL60 as well as almost all the primary leukemic cells while not in normal peripheral blood mononuclear cells (PBMNCs) and the expression of herg mRNA was not associated with the clinical and cytoge- netic features of leukemia. In addition, leukemic cell proliferation was dramatically inhibited by HERG K+ channel special inhibitor E-4031. Moreover, E-4031 suppressed the cell growth by induc- ing a specific block at the G1/S transition phase of the cell cycle but had no effect on apoptosis in leukemic cells. The results suggested that HERG1 K+ channels could regulate leukemic cells prolif- eration and were necessary for leukemic cells to proceed with the cell cycle. HERG1 K+ channels may also have oncogenic potential and may be a biomarker for diagnosis of leukemia and a novel potential pharmacological target for leukemia therapy.展开更多
最近研究表明hERG(human ether-a—go-go related gene)基因编码的钾离子通道(hERG通道)作为一种广谱的药物靶标,被某些药物作用时会引起长QT间期综合征(LQTS),甚至导致具有生命危险的室性心律失常——尖端扭转性室性心动过速(TdP),引...最近研究表明hERG(human ether-a—go-go related gene)基因编码的钾离子通道(hERG通道)作为一种广谱的药物靶标,被某些药物作用时会引起长QT间期综合征(LQTS),甚至导致具有生命危险的室性心律失常——尖端扭转性室性心动过速(TdP),引起制药公司和安全部门的广泛关注,现就hERG通道的结构和功能特征、不同亚基及细胞环境对其调节、目前临床前体内体外的研究方法及关于hERG通道的药物安全性评价进行简要介绍。展开更多
基金supported by a grant from the Natural Science Foundation of China(30772128)
文摘Objective： To investigate the expression of hergl gene in tumor tissues from gastric carcinomas and gastric carcinoma cell lines, and study the relationship between HERG K＋ channel expressions and tumor cell proliferation and apoptosis. Methods： RT-PCR and PCR assays were used to detect the expression of hergl gene in 64 gastric carcinomas and the gastric cancer cell line SGC-7901. Blocking the HERG K＋ channels was used to evaluate their effects on tumor cell proliferation and apoptosis. Results：The statistically significant expression of hergl gene was detected in all the gastric cancers and SGC-7901 cells, but not in normal tissues. The HERG K＋ channel blocker, E-4031, increased the cell population in G0/G1（P 〈 0.05） and the number of apoptotic tumor cells（P 〈 0.05）. Conclusion： HERG K＋ channels were expressed in all gastric carcinomas tested and these channels appear to modulate tumor cell proliferation and apoptosis.
基金a grant from National Science Foundation for Distinguished Young Scholars of China (No. 30225038)
文摘In order to investigate the expression and functional role of HERG1 K+ channels in leukemic cells and leukemic stem cells (LSCs), RT-PCR was used to detect the HERG1 K+ channels expression in leukemic cells and LSCs. The functional role of HERG1 K+ channels in leukemic cell proliferation was measured by MTT assay, and cell cycle and apoptosis were analyzed by flow cy- tometry. The results showed that herg mRNA was expressed in CD34+/CD38-, CD123+ LSCs but not in circulating CD34+ cells. Herg mRNA was also up-regulated in leukemia cell lines K562 and HL60 as well as almost all the primary leukemic cells while not in normal peripheral blood mononuclear cells (PBMNCs) and the expression of herg mRNA was not associated with the clinical and cytoge- netic features of leukemia. In addition, leukemic cell proliferation was dramatically inhibited by HERG K+ channel special inhibitor E-4031. Moreover, E-4031 suppressed the cell growth by induc- ing a specific block at the G1/S transition phase of the cell cycle but had no effect on apoptosis in leukemic cells. The results suggested that HERG1 K+ channels could regulate leukemic cells prolif- eration and were necessary for leukemic cells to proceed with the cell cycle. HERG1 K+ channels may also have oncogenic potential and may be a biomarker for diagnosis of leukemia and a novel potential pharmacological target for leukemia therapy.
文摘最近研究表明hERG(human ether-a—go-go related gene)基因编码的钾离子通道(hERG通道)作为一种广谱的药物靶标,被某些药物作用时会引起长QT间期综合征(LQTS),甚至导致具有生命危险的室性心律失常——尖端扭转性室性心动过速(TdP),引起制药公司和安全部门的广泛关注,现就hERG通道的结构和功能特征、不同亚基及细胞环境对其调节、目前临床前体内体外的研究方法及关于hERG通道的药物安全性评价进行简要介绍。
