首页|lncRNA SNHG1调控铁死亡减轻HIV-1 gp120 V3环所致小胶质细胞炎症的分子机制研究

lncRNA SNHG1调控铁死亡减轻HIV-1 gp120 V3环所致小胶质细胞炎症的分子机制研究

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目的:探究长链非编码RNA(lncRNA)SNHG1调控铁死亡改善HIV-1 gp120 V3环致CHME-5人源小胶质细胞炎症的分子机制.方法:体外培养CHME-5人源小胶质细胞,设立空白组、随机肽段组、HIV-1 gp120 V3环组(HIV-1 gp120组)、HIV-1 gp120+shCon组、HIV-1 gp120+SNHG1 sh2组、HIV-1 gp120+SNHG1 sh2+ferrostatin-1(Fer-1;铁死亡抑制剂)组和HIV-1 gp120+SNHG1 sh2+EX527(Sirt1抑制剂)组.随机肽段和gp120 V3环分别处理正常CHME-5细胞24 h;抑制剂预处理SNHG1 sh2细胞2 h后,gp120 V3环处理24 h.ELISA法检测细胞上清中炎症因子水平;Western blot法检测铁死亡相关蛋白[溶质载体家族7成员11(SLC7A11)和谷胱甘肽过氧化物酶4(GPX4)]、Sirt1和p53蛋白表达水平;酶标仪检测细胞内亚铁离子(Fe2+)和丙二醛(MDA)含量.结果:(1)ELISA结果显示:较空白组,HIV-1 gp120组炎症因子肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)和IL-1β表达水平显著提高(P<0.05);较HIV-1 gp120组,HIV-1 gp120+SNHG1 sh2组炎症因子表达水平显著降低(P<0.05);较HIV-1 gp120+SNHG1 sh2组,HIV-1 gp120+SNHG1 sh2+Fer-1组炎症因子表达水平显著降低(P<0.05),HIV-1 gp120+SNHG1 sh2+EX527组炎症因子表达水平显著升高(P<0.01).(2)Western blot结果显示:较空白组,HIV-1 gp120组铁死亡相关蛋白SLC7A11和GPX4表达水平显著下调(P<0.01);较HIV-1 gp120组,HIV-1 gp120+SNHG1 sh2组SLC7A11和GPX4表达水平显著上调(P<0.01);较HIV-1 gp120+SNHG1 sh2组,HIV-1 gp120+SNHG1 sh2+Fer-1组SLC7A11和GPX4表达水平明显上调(P<0.05),HIV-1 gp120+SNHG1 sh2+EX527组SLC7A11和GPX4表达水平显著下调(P<0.01),p53表达水平显著上调(P<0.05).(3)较空白组,HIV-1 gp120组Fe2+和MDA含量显著提高(P<0.05);较HIV-1 HIV-1 gp120组,HIV-1 gp120+SNHG1 sh2组Fe2+和MDA含量显著降低(P<0.01);较HIV-1 gp120+SNHG1 sh2组,HIV-1 gp120+SNHG1 sh2+Fer-1组Fe2+和MDA含量显著降低(P<0.05),HIV-1 gp120+SNHG1 sh2+EX527组Fe2+和MDA含量显著提高(P<0.05).结论:敲减SNHG1可减轻HIV-1 gp120 V3环介导的小胶质细胞炎症反应,其机制可能是通过Sirt1/p53信号通路调控铁死亡相关信号分子实现的.
Molecular mechanism of lncRNA SNHG1 regulating ferroptosis and at-tenuating inflammation of microglia induced by HIV-1 gp120 V3 loop
AIM:To investigate the molecular mechanism of long noncoding RNA(lncRNA)SNHG1 in regu-lating ferroptosis to alleviate inflammation in CHME-5 human microglia induced by HIV-1 gp120 V3 loop.METHODS:CHME-5 human microglia were cultured in vitro,and were divided into 7 groups:blank group,random peptide group,gp120 V3 loop group(HIV-1 gp120 group),HIV-1 gp120+shCon group,HIV-1 gp120+SNHG1 sh2 group,HIV-1 gp120+SNHG1 sh2+ferrostatin-1(Fer-1;ferroptosis inhibitor)group,and HIV-1 gp120+SNHG1 sh2+EX527(Sirt1 in-hibitor)group.Normal CHME-5 cells were treated with random peptide or gp120 V3 loop for 24 h.After pretreatment of SNHG1 sh2 cells with inhibitors for 2 h,the cells were then treated with gp120 V3 loop for 24 h.The levels of inflammato-ry cytokines in the cell supernatants were detected by ELISA.Western blot was used to detect the protein expression levels of solute carrier family 7 member 11(SLC7A11),glutathione peroxidase 4(GPX4),Sirt1 and p53.Microplate reader was used to detect the levels of intracellular ferrous ion(Fe2+)and malondialdehyde(MDA).RESULTS:(1)The results of ELISA showed that the expression levels of tumor necrosis factor-α(TNF-α),interleukin-6(IL-6)and IL-1β in HIV-1 gp120 group were significantly higher than those in blank group(P<0.05).Compared with HIV-1 gp120 group,the ex-pression levels of inflammatory cytokines in HIV-1 gp120+SNHG1 sh2 group were significantly decreased(P<0.05).Compared with HIV-1 gp120+SNHG1 sh2 group,the expression levels of inflammatory factors in HIV-1 gp120+SNHG1 sh2+Fer-1 were significantly decreased(P<0.05),but those in HIV-1 gp120+SNHG1 sh2+EX527 group were significant-ly increased(P<0.01).(2)The results of Western blot showed that compared with blank group,the expression levels of ferroptosis-related proteins SLC7A11 and GPX4 in HIV-1 gp120 group were significantly down-regulated(P<0.01).Com-pared with HIV-1 gp120 group,the expression levels of SLC7A11 and GPX4 in HIV-1 gp120+SNHG1 sh2 group were sig-nificantly up-regulated(P<0.01).Compared with HIV-1 gp120+SNHG1 sh2 group,the expression levels of SLC7A11 and GPX4 in HIV-1 gp120+SNHG1 sh2+Fer-1 group were significantly up-regulated(P<0.05),but the expression levels of SLC7A11 and GPX4 in HIV-1 gp120+SNHG1 sh2+EX527 group were significantly down-regulated(P<0.01),and the expression level of p53 was significantly up-regulated(P<0.05).(3)Compared with blank group,the levels of Fe2+and MDA in HIV-1 gp120 group were significantly increased(P<0.05).Compared with HIV-1 gp120 group,the levels of Fe2+and MDA in HIV-1 gp120+SNHG1 sh2 group were significantly decreased(P<0.01).Compared with HIV-1 gp120+SNHG1 sh2 group,Fe2+and MDA in HIV-1 gp120+SNHG1 sh2+Fer-1 group were significantly decreased(P<0.05),but those in HIV-1 gp120+SNHG1 sh2+EX527 group was significantly increased(P<0.05).CONCLUSION:Knockdown of SNHG1 can attenuate the inflammation in microglia induced by HIV-1 gp120 V3 loop,which may be achieved by regulating ferrop-tosis-related signaling molecules through the Sirt1/p53 signaling pathway.

HIV-associated neurocognitive disordersneuroinflammationferroptosislong noncoding RNA SNHG1Sirt1/p53 signaling pathway

王琳琳、左勤、李心怡、颜学勤、潘锐、付咏梅、董军

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暨南大学基础医学与公共卫生学院病理生理学系,国家中医药管理局病理生理实验室,粤港澳中枢神经再生研究院,广东 广州 510632

暨南大学附属第一医院骨科,广东 广州 510630

HIV相关神经认知障碍 神经炎症 铁死亡 长链非编码RNA SNHG1 Sirt1/p53信号通路

国家自然科学基金国家自然科学基金广东省自然科学基金广东省自然科学基金高等学校学科创新引智计划(111计划)

81471235819741852019A15150120242022A1515010268B14036

2024

中国病理生理杂志
中国病理生理学会

中国病理生理杂志

CSTPCD北大核心
影响因子:1.065
ISSN:1000-4718
年,卷(期):2024.40(5)
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