[目的]探讨HPV18致癌基因E6选择性剪接在宫颈癌细胞中的潜在作用。[方法]HPV18感染或过表达HPV18致癌基因E6后,MTT法检测宫颈癌细胞C-33 A的增殖水平、逆转录PCR和琼脂糖凝胶电泳检测E6选择性剪接产物表达水平、免疫印迹检测E7蛋白表达...[目的]探讨HPV18致癌基因E6选择性剪接在宫颈癌细胞中的潜在作用。[方法]HPV18感染或过表达HPV18致癌基因E6后,MTT法检测宫颈癌细胞C-33 A的增殖水平、逆转录PCR和琼脂糖凝胶电泳检测E6选择性剪接产物表达水平、免疫印迹检测E7蛋白表达水平。高通量测序HPV18感染或不感染的C-33 A细胞后调控E6选择性剪接的关键分子。[结果]过表达E6并感染HPV18的C-33 A细胞的增殖水平(2.35±0.37 vs 1.27±0.28)显著上升,且高于未过表达E6(1.27±0.28 vs 0.68±0.11)(P<0.05)。HPV18感染和过表达SRSF3后,选择性剪接产物E6*Ⅰ水平上升(0.25±0.03 vs 0.65±0.13)、E7蛋白表达水平(0.20±0.04 vs 0.77±0.18)上升。敲低SRSF3和过表达miR-1208时,C-33 A细胞的增殖水平(1.30±0.18 vs 0.65±0.13,1.75±0.27 vs 0.75±0.13)显著下降(P<0.05)。与只过表达E6相比,E6与SRSF3共表达、E6过表达同时干扰miR-1208均能够显著促进C-33 A细胞的增殖水平(0.65±0.13 vs 1.65±0.40,0.59±0.11 vs 1.70±0.24)(P<0.05)。敲低SRSF3后,选择性剪接产物E6*Ⅰ水平下降(0.15±0.02 vs 0.57±0.15)、E7蛋白表达水平下降(0.20±0.04 vs 0.77±0.18)(P<0.05)。干扰miR-1208后,选择性剪接产物E6*Ⅰ水平上升(1.12±0.25 vs 2.56±0.33)、SRSF3(0.15±0.03 vs 0.75±0.15)和E7蛋白表达水平上升(0.65±0.11 vs 0.98±0.20);过表达miR-1208后,选择性剪接产物E6*Ⅰ水平下降(1.85±0.34 vs 1.15±0.20)、SRSF3(1.33±0.14 vs 0.20±0.05)和E7蛋白表达水平下降(0.88±0.13 vs 0.50±0.10)(P<0.05)。此外,miR-1208靶向SRSF3 mRNA的3′端非编码区。[结论]miR-1208靶向SRSF3 mRNA的3′端非编码区并减少SRSF3的蛋白表达水平。SRSF3能够促进HPV18致癌基因E6的选择性剪接和E7蛋白的表达。HPV18感染后操纵miR-1208/SRSF3/E6/E7调控轴促进宫颈癌细胞的增殖。展开更多
Infection with human papillomaviruses is strongly associated with the development of multiple cancers including esophageal squarnous cell carcinoma. The HPV E6 gene is essential for the oncogenic potential of HPV. The...Infection with human papillomaviruses is strongly associated with the development of multiple cancers including esophageal squarnous cell carcinoma. The HPV E6 gene is essential for the oncogenic potential of HPV. The regulation of apoptosis by oncogene has been related to carcinogenesis closely; therefore, the modulation of E6 on cellular apoptosis has become a hot research topic recently. Inactivation of the pro-apoptotic tumor suppressor p53 by E6 is an important mechanism by which E6 promotes cell growth; it is expected that inactivation of p53 by E6 should lead to a reduction in cellular apoptosis, numerous studies showed that E6 could in fact sensitize cells to apoptosis. The molecular basis for apoptosis modulation by E6 is poorly understood. In this article, we will present an overview of observations and current understanding of molecular basis for E6-induced apoptosis.展开更多
文摘[目的]探讨HPV18致癌基因E6选择性剪接在宫颈癌细胞中的潜在作用。[方法]HPV18感染或过表达HPV18致癌基因E6后,MTT法检测宫颈癌细胞C-33 A的增殖水平、逆转录PCR和琼脂糖凝胶电泳检测E6选择性剪接产物表达水平、免疫印迹检测E7蛋白表达水平。高通量测序HPV18感染或不感染的C-33 A细胞后调控E6选择性剪接的关键分子。[结果]过表达E6并感染HPV18的C-33 A细胞的增殖水平(2.35±0.37 vs 1.27±0.28)显著上升,且高于未过表达E6(1.27±0.28 vs 0.68±0.11)(P<0.05)。HPV18感染和过表达SRSF3后,选择性剪接产物E6*Ⅰ水平上升(0.25±0.03 vs 0.65±0.13)、E7蛋白表达水平(0.20±0.04 vs 0.77±0.18)上升。敲低SRSF3和过表达miR-1208时,C-33 A细胞的增殖水平(1.30±0.18 vs 0.65±0.13,1.75±0.27 vs 0.75±0.13)显著下降(P<0.05)。与只过表达E6相比,E6与SRSF3共表达、E6过表达同时干扰miR-1208均能够显著促进C-33 A细胞的增殖水平(0.65±0.13 vs 1.65±0.40,0.59±0.11 vs 1.70±0.24)(P<0.05)。敲低SRSF3后,选择性剪接产物E6*Ⅰ水平下降(0.15±0.02 vs 0.57±0.15)、E7蛋白表达水平下降(0.20±0.04 vs 0.77±0.18)(P<0.05)。干扰miR-1208后,选择性剪接产物E6*Ⅰ水平上升(1.12±0.25 vs 2.56±0.33)、SRSF3(0.15±0.03 vs 0.75±0.15)和E7蛋白表达水平上升(0.65±0.11 vs 0.98±0.20);过表达miR-1208后,选择性剪接产物E6*Ⅰ水平下降(1.85±0.34 vs 1.15±0.20)、SRSF3(1.33±0.14 vs 0.20±0.05)和E7蛋白表达水平下降(0.88±0.13 vs 0.50±0.10)(P<0.05)。此外,miR-1208靶向SRSF3 mRNA的3′端非编码区。[结论]miR-1208靶向SRSF3 mRNA的3′端非编码区并减少SRSF3的蛋白表达水平。SRSF3能够促进HPV18致癌基因E6的选择性剪接和E7蛋白的表达。HPV18感染后操纵miR-1208/SRSF3/E6/E7调控轴促进宫颈癌细胞的增殖。
基金Supported by the National Natural Science Foundation of China,No.30400016, the Elite Program of FMMU, No.4138A4324the Major State Basic Research Development Program of China (973 Program), No. 2004CB518702
文摘Infection with human papillomaviruses is strongly associated with the development of multiple cancers including esophageal squarnous cell carcinoma. The HPV E6 gene is essential for the oncogenic potential of HPV. The regulation of apoptosis by oncogene has been related to carcinogenesis closely; therefore, the modulation of E6 on cellular apoptosis has become a hot research topic recently. Inactivation of the pro-apoptotic tumor suppressor p53 by E6 is an important mechanism by which E6 promotes cell growth; it is expected that inactivation of p53 by E6 should lead to a reduction in cellular apoptosis, numerous studies showed that E6 could in fact sensitize cells to apoptosis. The molecular basis for apoptosis modulation by E6 is poorly understood. In this article, we will present an overview of observations and current understanding of molecular basis for E6-induced apoptosis.
