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Title: [Circ_0000263 improves radiosensitivity of Hela cells by inhibiting the activity of telomerase protein through miR-338-3p/TERT].
Author: Wang C, Huo YK, Li MY, Li C, Shen XH, Wang SJ, Liu YF, Jiang ZX.
Journal: Zhonghua Zhong Liu Za Zhi; 2024 Jul 23; 46(7):676-685. PubMed ID: 39034803.
Abstract:
Objective: To explore the effect and molecular mechanism of circ_0000263 on HeLa cell activity, apoptosis, telomerase activity, and radiosensitivity. Methods: The Hela cells were divided into si-NC, si-circ, vector, circ_0000263, anti-NC, anti-miR-338-3p, miR-NC, miR-338-3p, si-circ+anti-NC, si-circ+ anti-miR-338-3p, si-circ+vector, si-circ+TERT, sh-NC, sh-circ groups. Reverse transcription-quantitative real-time polymerase chain reaction (RT-qPCR) was used to detect the expressions of circ_0000263 and miR-338-3p. Cell clone formation array was used to detect cell survival; cell counting kit-8 (CCK-8) to detect cell proliferation; flow cytometry to detect apoptosis; western blot method to detect the expressions of proliferating cell nuclear antigen (PCNA), Cleaved-casp3, telomerase reverse transcriptase (TERT) proteins; double luciferase assay to detect the targeting relationships of circ_0000263 and miR-338-3p, miR-338-3p and TERT; telomere repeat amplification enzyme linked immunosorbent assay (TRAR-ELISA) to detect telomerase activity. Results: Circ_0000263 was highly expressed in Hela cells, miR-338-3p was low expressed, and TERT was highly expressed; circ_0000263 was also highly expressed in Hela cells treated with radiation (P＜0.05). Knockdown of circ_0000263 inhibited the clone formation and cell proliferation ability of HeLa cells, and enhanced the radiosensitivity and apoptosis of HeLa cells. In contrast, knockdown of circ_0000263 decreased PCNA protein expression level and enhanced Cleaved-casp3 protein expression level in HeLa cells (P＜0.05). The apoptosis rate in the si-circ group was (13.19±1.12)%, which was higher than (6.80±0.62)% of si-NC group (P＜0.05). The apoptosis rate in the si-circ+4 Gy group was (24.82±1.57)%, which was higher than (17.00±0.96)% of si-NC+4 Gy group (P＜0.05). Circ_0000263 targeted regulated miR-338-3p, and miR-338-3p targeted regulated TERT. MiR-338-3p was lowly expressed in HeLa cells, and knockdown of circ_0000263 elevated miR-338-3p expression level in HeLa cells. Circ_0000263 regulated TERT expression and inhibited telomerase activity through miR-338-3p. MiR-338-3p/TERT can restore the effect of circ_0000263 on the radiosensitivity of Hela cells. The apoptosis rate in the si-circ+anti-NC group was (27.37±0.89)%, which was higher than (18.22±1.18)% of the si-circ+anti-miR-338-3p group (P＜0.05). The apoptosis rate in the si-circ+vector group was (27.55±0.48)%, which was higher than (20.10±0.68)% of si-circ+TERT group (P＜0.05). After 72 hours of radiation by 4 Gy, the cell survival fraction of si-circ+anti-NC group was 0.41±0.02, which was lower than 0.66±0.03 of the si-circ+anti-miR-338-3p group (P＜0.05); the cell survival fraction of si-circ+vector group was 0.42±0.05, which was lower than 0.70±0.03 of si-circ+TERT group (P＜0.05). Conclusion: Inhibiting the expression of circ_0000263 supresses the proliferation of Hela cells by regulating miR-338-3p/TERT, promotes apoptosis, inhibits telomerase activity, increases the radiosensitivity of cancer cells, and provides a theoretical basis for improving the radiosensitivity of Hela cells. 目的： 探讨circ_0000263对HeLa细胞活性、凋亡、端粒酶活性以及放射敏感性的影响及其分子机制。 方法： 采用实时荧光定量聚合酶链反应检测circ_0000263和miR-338-3p mRNA表达水平，细胞克隆形成实验检测细胞存活情况，细胞计数试剂盒8检测细胞增殖，流式细胞术检测细胞凋亡，Western blot法检测蛋白增殖细胞核抗原（PCNA）、Cleaved-casp3、端粒酶逆转录酶（TERT）的表达，双荧光素酶实验检测circ_0000263和miR-338-3p、miR-338-3p和TERT的靶向关系，端粒重复序列扩增酶联免疫吸附试验检测端粒酶活性。 结果： Hela细胞中circ_0000263呈高表达，miR-338-3p呈低表达，TERT呈高表达，射线辐射的HeLa细胞中circ_0000263也呈高表达（均P＜0.05）。敲减circ_0000263可抑制HeLa细胞克隆形成和细胞增殖能力，增强HeLa细胞的辐射敏感性和细胞凋亡。敲减circ_0000263可降低HeLa细胞中PCNA蛋白表达水平，增强HeLa细胞中Cleaved-casp3蛋白表达水平（P＜0.05）。si-circ_0000263（si-circ）组细胞凋亡率为（13.19±1.12）%，高于si-NC组［（6.80±0.62）%，P＜0.05］；si-circ+4 Gy组细胞凋亡率为（24.82±1.57）%，高于si-NC+4 Gy组［（17.00±0.96）%，P＜0.05］。circ_0000263靶向调控miR-338-3p，miR-338-3p靶向调控TERT。miR-338-3p在Hela细胞中呈低表达，敲减circ_0000263可提高HeLa细胞中miR-338-3p表达水平。circ_0000263通过miR-338-3p调控TERT表达，抑制端粒酶活性。miR-338-3p/TERT均能恢复抑制circ_0000263对Hela细胞放射敏感性的影响。si-circ+anti-NC组细胞凋亡率为（27.37±0.89）%，高于si-circ+anti-miR-338-3p组［（18.22±1.18）%，P＜0.05］；si-circ+vector组细胞凋亡率为（27.55±0.48）%，高于si-circ+TERT组［（20.10±0.68）%，P＜0.05］。经4 Gy射线照射72 h后，si-circ+anti-NC组细胞存活分数（0.41±0.02）低于si-circ+anti-miR-338-3p组（0.66±0.03，P＜0.05）；si-circ+vector组细胞存活分数（0.42±0.05）低于si-circ+TERT组（0.70±0.03，P＜0.05）。 结论： 抑制circ_0000263的表达通过调控miR-338-3p/TERT抑制Hela细胞增殖，促进细胞凋亡，抑制端粒酶活性，提高癌细胞的放射敏感性。.

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