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[喉鳞状细胞癌中的铁死亡及其受M2巨噬细胞衍生外泌体的调控]

[Ferroptosis in laryngeal squamous cell carcinoma and its regulation by M2 macrophage-derived exosomes].

作者信息

Xu L C, Cao J, Li W J, Yang Z M, Zhao R, Zhang J R, Guo Y, Ge J C, Li L, Sun Y N, Liu M, Tian L L

机构信息

Department of Otorhinolaryngology, Head and Neck Surgery, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China.

出版信息

Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2022 Mar 7;57(3):324-332. doi: 10.3760/cma.j.cn115330-20210621-00361.

Abstract

To investigate ferroptosis in laryngeal squamous cell carcinoma (LSCC) and its regulation by M2 macrophage-derived exosomes. LSCC and adjacent noncancerous tissue samples were collected from 32 patients treated in the Department of Otorhinolaryngology, Head and Neck Surgery of the Second Affiliated Hospital of Harbin between September 2018 and April 2021, including 26 males and 6 females, aged 43-79 years. The expressions of ferroptosis marker glutathione peroxidase 4(GPX4) in LSCC and adjacent noncancerous tissues were detected by immunohistochemistry and reverse transcriptase-polymerase chain reaction(RT-PCR). The correlations between GPX4 expression and clinicopathological factors in LSCC were analyzed. Biological changes of TU212 cells after treated with ferroptosis-induced agent erastin were detected by transmission electron microscope, cell counting kit-8(CCK-8), clone test, reactive oxygen species(ROS), malondialdehyde(MDA), glutathione(GSH), JC-1, RT-PCR and western blot. Exosomes were isolated from the supernatant of M0/M2 macrophages (M0-exos/M2-exos) and co-incubated with erastin-treated TU212 cells to detect the change of ferroptosis in cells of each group. The data were analyzed by SPSS software of version19.0. GPX4 expression in LSCC tissues was significantly higher than that in adjacent noncancerous tissues (2.04±0.65 0.99±0.09=30.36, <0.001), and was closely related to T stage and clinical stage (Ⅰ-ⅡⅢ-Ⅳ: 1.75±0.39 2.18±0.71, =2.25<0.05; T1-2 T3-4: 1.71±0.42 2.20±0.69, =2.06, <0.05). In TU212 cells treated with erastin, mitochondrial crest became smaller, membrane density increased, proliferation rate decreased, intracellular ROS level increased, mitochondrial membrane potential depolarized, GSH content decreased, intracellular MDA level increased and expressions of GPX4 mRNA and protein decreased. Change of M0 into M2 macrophages was induced by IL-4 stimulation. When erastin-treated TU212 cells were incubated with M2-exos, cell proliferation was partially restored and GPX4 expression was enhanced, and also with the recoveries of levels of ROS, MDA and GSH (all <0.05). Ferroptosis is one of the cell death ways of LSCC. M2-exos may inhibit ferroptosis of LSCC cells.

摘要

探讨喉鳞状细胞癌(LSCC)中的铁死亡及其受M2巨噬细胞衍生外泌体的调控。收集2018年9月至2021年4月在哈尔滨医科大学附属第二医院耳鼻咽喉头颈外科接受治疗的32例患者的LSCC及癌旁非癌组织样本,其中男性26例,女性6例,年龄43 - 79岁。采用免疫组织化学和逆转录聚合酶链反应(RT-PCR)检测LSCC及癌旁非癌组织中铁死亡标志物谷胱甘肽过氧化物酶4(GPX4)的表达。分析LSCC中GPX4表达与临床病理因素的相关性。用透射电子显微镜、细胞计数试剂盒-8(CCK-8)、克隆试验、活性氧(ROS)、丙二醛(MDA)、谷胱甘肽(GSH)、JC-1、RT-PCR和蛋白质印迹法检测铁死亡诱导剂埃拉斯汀处理后TU212细胞的生物学变化。从M0/M2巨噬细胞的上清液中分离外泌体(M0-exos/M2-exos),并与经埃拉斯汀处理的TU212细胞共孵育,以检测各组细胞中铁死亡的变化。数据采用19.0版SPSS软件进行分析。LSCC组织中GPX4表达明显高于癌旁非癌组织(2.04±0.65 0.99±0.09 = 30.36,<0.001),且与T分期和临床分期密切相关(Ⅰ - Ⅱ Ⅲ - Ⅳ:1.75±0.39 2.18±0.71,= 2.25 < 0.05;T1 - 2 T3 - 4:1.71±0.42 2.20±0.69,= 2.06,<0.05)。在经埃拉斯汀处理的TU212细胞中,线粒体嵴变小,膜密度增加,增殖率降低,细胞内ROS水平升高,线粒体膜电位去极化,GSH含量降低,细胞内MDA水平升高,GPX4 mRNA和蛋白表达降低。IL-4刺激诱导M0向M2巨噬细胞转变。当经埃拉斯汀处理的TU212细胞与M2-exos共孵育时,细胞增殖部分恢复,GPX4表达增强,同时ROS、MDA和GSH水平也恢复(均<0.05)。铁死亡是LSCC的细胞死亡方式之一。M2-exos可能抑制LSCC细胞的铁死亡。

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