中国医科大学学报  2025, Vol. 54 Issue (11): 982-987

文章信息

徐芳丽, 王焕, 徐可
XU Fangli, WANG Huan, XU Ke
miR-488-3p调控cGAS-STING信号通路对肾小管上皮细胞损伤的影响
Effects of miR-488-3p on renal tubular epithelial cell injury by regulating the cGAS-STING signaling pathway
中国医科大学学报, 2025, 54(11): 982-987
Journal of China Medical University, 2025, 54(11): 982-987

文章历史

收稿日期:2024-10-10
网络出版时间:2025-11-21 13:04:26
miR-488-3p调控cGAS-STING信号通路对肾小管上皮细胞损伤的影响
徐芳丽 , 王焕 , 徐可     
新乡市中心医院肾内科,河南 新乡 453000
摘要目的 探讨miR-488-3p调控环磷酸鸟苷-腺苷酸合成酶(cGAS)-干扰素基因刺激因子(STING)通路对肾小管上皮细胞损伤的影响。方法 将人肾小管上皮细胞HK-2分为对照组、缺氧复氧(HR)组、抑制对照组、miR-488-3p抑制组、cGAS-STING通路激活剂(RocA)组、miR-488-3p抑制+RocA组。用实时定量PCR检测HK-2细胞中miR-488-3p的表达水平;用CCK-8法检测细胞活力;用ELISA检测HK-2细胞上清液中白细胞介素(IL)-10、IL-1β、肿瘤坏死因子α(TNF-α)水平;用DCFH-DA法检测细胞中活性氧(ROS)平均荧光强度。结果 与对照组比较,HR组HK-2细胞中miR-488-3p表达水平、上清液中IL-1β和TNF-α水平、细胞中ROS平均荧光强度、丙二醛(MDA)水平、细胞凋亡率及cleaved caspase-3、Bax、cGAS、STING蛋白表达水平升高,细胞活力、上清液中IL-10水平、细胞中超氧化物歧化酶(SOD)水平降低(P < 0.05);与HR组、抑制对照组比较,miR-488-3p抑制组HK-2细胞中miR-488-3p表达、上清液中IL-1β和TNF-α水平、细胞中ROS平均荧光强度、MDA水平、细胞凋亡率及cleaved caspase-3、Bax、cGAS、STING蛋白表达水平降低,细胞活力、上清液中IL-10水平、细胞中SOD水平升高(P < 0.05)。结论 下调miR-488-3p表达可抑制HR诱导的HK-2细胞炎症、氧化应激及细胞凋亡,减轻细胞损伤的机制可能与抑制cGAS-STING通路激活有关。
关键词miR-488-3p    肾小管上皮细胞    急性肾损伤    凋亡    氧化应激    
Effects of miR-488-3p on renal tubular epithelial cell injury by regulating the cGAS-STING signaling pathway
XU Fangli , WANG Huan , XU Ke     
Department of Nephrology, Xinxiang Central Hospital, Xinxiang 453000, China
Abstract: Objective To investigate the effect of miR-488-3p on renal tubular epithelial cell injury by regulating the cyclic guanosine monophosphate-adenosine monophosphate synthase (cGAS) -stimulator of interferon gene (STING) signaling pathway. Methods Human renal tubular epithelial HK-2 cells were divided into control, hypoxia-reoxygenation (HR), inhibition control, miR-488-3p inhibition, cGAS-STING pathway activator (RocA), and miR-488-3p inhibition+RocA groups. Quantitative real-time polymerase chain reaction was used to detect miR-488-3p expression in HK-2 cells. Cell viability was assessed using the CCK-8 assay. Enzyme-linked immunosorbent assay was used to measure the levels of interleukin (IL) -10, IL-1β, and tumor necrosis factor-α (TNF-α) in the culture supernatant of HK-2 cells. The DCFH-DA method was applied to detect the average fluorescence intensity of reactive oxygen species (ROS) in cells. Results Compared with the control group, the HR group showed increased miR-488-3p expression, IL-1β and TNF-α levels, average fluorescence intensity of ROS, malondialdehyde (MDA) levels, apoptosis rate, and protein expression of cleaved caspase-3, Bax, cGAS, and STING, whereas cell viability, IL-10 levels, and superoxide dismutase (SOD) activity were reduced in the HR group (P < 0.05). Compared with the HR and inhibition control groups, the miR-488-3p inhibition group exhibited decreased expression of miR-488-3p, IL-1β and TNF-α levels, average fluorescence intensity of ROS, MDA levels, apoptosis rate, and protein levels of cleaved caspase-3, Bax, cGAS, and STING, whereas cell viability, IL-10 levels, and SOD activity were increased (P < 0.05). Conclusion Downregulation of miR-488-3p expression mitigates HR-induced inflammation, oxidative stress, and apoptosis in HK-2 cells, thereby reducing cell damage. The underlying mechanisms may be associated with an inhibition of the cGAS-STING signaling pathway.

急性肾损伤(acute kidney injury,AKI)是一种常见的临床综合征,在全球住院患者中的发生率约为19.3%~31%[1]。目前AKI的发病机制尚未明确,治疗手段有限。肾小管上皮细胞损伤是AKI中最重要的事件[2]。因此,探讨肾小管上皮细胞损伤的潜在机制对确定AKI的治疗靶点具有重要意义。研究[3]表明,微RNA(micro RNA,miRNA)表达异常与肾小管上皮细胞损伤有关,如miR-488-3p可诱导小鼠肾小球足细胞凋亡[4]。研究[5]发现,抑制环磷酸鸟苷-腺苷酸合成酶(cyclic guanosine monophosphate-adenosine monophosphate synthase,cGAS)-干扰素基因刺激因子(stimulator of interferon gene,STING)通路可缓解小鼠AKI,因此,本研究拟探讨miR-488-3p调控cGAS-STING通路对肾小管上皮细胞损伤的影响及其机制。

1 材料与方法 1.1 材料

1.1.1 细胞

人肾小管上皮细胞系HK-2购自上海普诺赛生物工程有限公司。

1.1.2 试剂

miR-488-3p抑制剂及其抑制剂对照(inhibitor NC)、cGAS-STING通路激活剂RocA(美国MCE公司);CCK-8试剂盒(济南远达晶美生物科技有限公司);人白细胞介素(interleukin,IL)-10、IL-1β、肿瘤坏死因子α(tumor necrosis factor α,TNF-α)ELISA试剂盒(上海广锐生物科技有限公司);DCFH-DA(上海抚生实业有限公司);丙二醛(malondialdehyde,MDA)、超氧化物歧化酶(superoxide dismutase,SOD)试剂盒(武汉赛培生物科技有限公司);Annexin V-FITC/PI细胞凋亡试剂盒(广州美仑生物科技有限公司);cleaved caspase-3、Bcl-2关联X蛋白(Bcl-2 associated X protein,Bax)、GAPDH、cGAS、STING一抗及二抗(英国abcam公司)。

1.2 方法

1.2.1 细胞分组

将HK-2细胞分为对照组、HR组、抑制对照组、miR-488-3p抑制组、RocA组、miR-488-3p抑制+RocA组。对照组HK-2细胞正常培养;HR组HK-2细胞进行缺氧(1%O2+94%N2+5%CO2)处理4 h后再进行复氧(5%CO2+95%O2)处理2 h[6];抑制对照组HK-2细胞转染inhibitor NC 24 h后,缺氧处理4 h,复氧处理2 h;miR-488-3p抑制组HK-2细胞转染miR-488-3p抑制剂24 h后,缺氧处理4 h,复氧处理2 h;RocA组HK-2细胞用25 nmol/L RocA处理24 h后,缺氧处理4 h,复氧处理2 h[7];miR-488-3p抑制+RocA组HK-2细胞转染miR-488-3p抑制剂的同时,还用25 nmol/L RocA处理24 h,再进行缺氧处理4 h,复氧处理2 h。处理结束后收集各组细胞。

1.2.2 miR-488-3p表达水平检测

收集各组细胞,用TRIzol试剂提取细胞总RNA,用NanoDrop 2000测定RNA浓度,将RNA逆转录为cDNA后,采用ABI7500系统进行实时定量PCR。以U6作内参照,采用2-∆∆Ct法计算miR-488-3p相对表达量。引物序列:miR-488-3p,正向5’-CGGGGCAGCUCAGUACAG-3’,反向5’-CAGTGCGTGTCGTGGAGT-3’;U6,正向5’-CGCTTCGGCAGCACATATAC-3’,反向5’-AAATATGGAACGCTTCACGA-3’。

1.2.3 细胞活力检测

将HK-2细胞以5×103/孔的密度接种至96孔板,对各组细胞进行相应处理后,每孔加入10 μL CCK-8溶液。37℃避光孵育3 h后,用酶标仪测量450 nm处的吸光度,并计算细胞活力。

1.2.4 IL-10、IL-1β、TNF-α水平检测

收集各组HK-2细胞培养液,严格按照ELISA试剂盒说明书检测上清液中IL-10、IL-1β、TNF-α水平。

1.2.5 活性氧(reactive oxygen species,ROS)平均荧光强度、MDA、SOD水平检测

收集各组HK-2细胞,PBS洗涤3次后,加入10 μmol/L DCFH-DA混合均匀,在37 ℃下孵育30 min。用PBS洗涤细胞3次,以充分去除未渗透细胞的DCFH-DA,在荧光显微镜下观察HK-2细胞中ROS平均荧光强度变化。按照试剂盒说明书检测HK-2细胞中MDA、SOD水平。

1.2.6 细胞凋亡率检测

收集各组HK-2细胞,用胰蛋白酶消化,PBS洗涤后,加入5 μL Annexin V-FITC和5 μL PI,避光孵育15 min后,用流式细胞仪检测细胞凋亡情况。

1.2.7 cleaved caspase-3、Bax、cGAS、STING蛋白表达水平检测

收集各组HK-2细胞,RIPA裂解并提取总蛋白。BCA法测定蛋白浓度,取45 μg等量蛋白进行电泳分离,转至PVDF膜。用5%脱脂牛奶阻断膜1 h,TBST洗涤膜3次后,将膜与一抗[cleaved caspase-3(1∶4 000稀释)、Bax(1∶6 000稀释)、cGAS(1∶4 000稀释)、GAPDH(1∶3 000稀释)、STING(1∶5 000稀释)在4 ℃下孵育过夜。用TBST洗涤膜3次,加入二抗(1∶10 000稀释)]室温下孵育1 h,用TBST洗涤3次,ECL显色。使用ImageJ软件对图像进行量化。

1.3 统计学分析

用Prism 8.0软件进行统计分析。计量资料以x±s表示,采用单因素方差分析和事后SNK-q检验进行多组比较。P < 0.05为差异有统计学意义。

2 结果 2.1 各组HK-2细胞中miR-488-3p表达及细胞活力比较

与对照组(1.00±0.00,99.43%±0.35%)比较,HR组细胞中miR-488-3p表达(1.96±0.17)升高,细胞活力(67.51%±3.12%)降低(P < 0.05);与HR组或抑制对照组(2.01±0.18,66.82%±3.15%)比较,miR-488-3p抑制组细胞中miR-488-3p表达(1.23±0.09)降低,细胞活力(82.29%±3.78%)升高(P < 0.05);与HR组比较,RocA组细胞中miR-488-3p表达(1.98±0.16)差异无统计学意义(P > 0.05),细胞活力(54.95%±2.67%)降低(P < 0.05);与miR-488-3p抑制组比较,miR-488-3p抑制+RocA组细胞中miR-488-3p表达(1.26±0.11)差异无统计学意义(P > 0.05),细胞活力(71.36%±3.31%)降低(P < 0.05)。

2.2 抑制miR-488-3p表达对HK-2细胞IL-10、IL-1β、TNF-α水平的影响

与对照组比较,HR组细胞上清液中IL-10水平降低,IL-1β、TNF-α水平升高(P < 0.05);与HR组、抑制对照组比较,miR-488-3p抑制组细胞上清液中IL-10水平升高,IL-1β、TNF-α水平降低(P < 0.05);与HR组比较,RocA组细胞上清液中IL-10水平降低,IL-1β、TNF-α水平升高(P < 0.05);与miR-488-3p抑制组比较,miR-488-3p抑制+RocA组细胞上清液中IL-10水平降低,IL-1β、TNF-α水平升高(P < 0.05)。见表 1

表 1 各组HK-2细胞上清液中IL-10、IL-1β、TNF-α水平比较(pg/mL) Tab.1 Comparison of IL-10, IL-1 β, and TNF-α levels in the supernatant of HK-2 cells in different groups (pg/mL)
Group IL-10 IL-1β TNF-α
Control 76.65±3.14 26.78±1.32 115.56±5.69
HR 39.73±1.751) 59.93±2.461) 20.34±10.881)
Inhibition control 40.26±1.98 60.28±2.51 205.51±11.01
miR-488-3p inhibition 65.93±3.082),3) 34.45±1.682),3) 136.56±6.232),3)
RocA 31.44±1.432) 68.45±3.052) 261.56±1.732)
miR-488-3p inhibition+RocA 53.39±2.174) 47.55±2.194) 16.25±8.124)
1) P < 0.05 vs. control group; 2) P < 0.05 vs. HR group; 3) P < 0.05 vs. inhibition control group; 4) P < 0.05 vs. miR-488-3p inhibition group. n=6.

2.3 抑制miR-488-3p表达对HK-2细胞中ROS平均荧光强度、MDA、SOD水平的影响

与对照组比较,HR组细胞中SOD水平降低,ROS平均荧光强度、MDA水平升高(P < 0.05);与HR组、抑制对照组比较,miR-488-3p抑制组细胞中SOD水平升高,ROS平均荧光强度、MDA水平降低(P < 0.05);与HR组比较,RocA组细胞中SOD水平降低,ROS平均荧光强度、MDA水平升高(P < 0.05);与miR-488-3p抑制组比较,miR-488-3p抑制+RocA组细胞中SOD水平降低,ROS平均荧光强度、MDA水平升高(P < 0.05),见图 1表 2

A, control group; B, HR group; C, inhibiton control group; D, miR-488-3p inhibition group; E, RocA group; F, miR-488-3p inhibition+RocA group. 图 1 各组HK-2细胞中ROS平均荧光强度DCFH-DA染色×200 Fig.1 The average fluorescence intensity of ROS in HK-2 cells DCFH-DA staining× 200

表 2 各组HK-2细胞中ROS平均荧光强度、MDA、SOD水平比较 Tab.2 Comparison of average fluorescence intensity of ROS, MDA, and SOD levels in HK-2 cells among different groups
Group Arerage fluorescence intensity of ROS MDA (mmol/mL) SOD (U/mL)
Control 16.22±0.79 1.23±0.14 285.69±1.83
HR 37.75±1.781) 5.56±0.211) 167.73±8.261)
Inhibition control 38.05±1.93 5.62±0.23 169.52±8.29
miR-488-3p inhibition 21.16±0.972),3) 2.08±0.102),3) 251.52±1.212),3)
RocA 44.55±2.032) 6.72±0.292) 138.77±6.712)
miR-488-3p inhibition+RocA 30.41±1.464) 4.01±0.184) 200.33±9.824)
1) P < 0.05 vs. control group; 2) P < 0.05 vs. HR group; 3) P < 0.05 vs. inhibiton control group; 4) P < 0.05 vs. miR-488-3p inhibition group. n=6.

2.4 抑制miR-488-3p表达对HK-2细胞凋亡的影响

与对照组(3.16%±0.12%)比较,HR组细胞凋亡率(16.88%±0.79%)升高(P < 0.05);与HR组、抑制对照组(17.01%±0.82%)比较,miR-488-3p抑制组细胞凋亡率(6.29%±0.31%)降低(P < 0.05);与HR组比较,RocA组细胞凋亡率(21.22%±1.03%)升高(P < 0.05);与miR-488-3p抑制组比较,miR-488-3p抑制+RocA组细胞凋亡率(10.95%±0.43%)升高(P < 0.05)。见图 2

A, control group; B, HR group; C, inhibiton control group; D, miR-488-3p inhibition group; E, RocA group; F, miR-488-3p inhibition+RocA group. 图 2 HK-2细胞凋亡的流式细胞术检测结果 Fig.2 Flow cytometry detection results of HK-2 cell apoptosis

2.5 抑制miR-488-3p表达对各组细胞中cleaved caspase-3、Bax及cGAS-STING通路蛋白表达的影响

与对照组(0.78±0.07,0.52±0.05,0.36±0.03,0.12±0.01)比较,HR组HK-2细胞中cleaved caspase-3、Bax、cGAS、STING蛋白表达水平(1.89±0.14,1.43±0.12,1.01±0.09,0.72±0.07)升高(P < 0.05);与HR组、抑制对照组(1.91±0.16,1.45±0.13,1.03±0.10,0.70±0.06)比较,miR-488-3p抑制组HK-2细胞中cleaved caspase-3、Bax、cGAS、STING蛋白表达水平(0.97±0.08,0.73±0.07,0.47±0.04,0.28±0.02)降低(P < 0.05);与HR组比较,RocA组HK-2细胞中cleaved caspase-3、Bax、cGAS、STING蛋白表达水平(2.37±0.15,1.92±0.14,1.39±0.12,0.89±0.08)升高(P < 0.05);与miR-488-3p抑制组比较,miR-488-3p抑制+RocA组HK-2细胞中cleaved caspase-3、Bax、cGAS、STING蛋白表达水平(1.51±0.13,1.04±0.09,0.73±0.07,0.51±0.05)升高(P < 0.05)。见图 3

1, control group; 2, HR group; 3, inhibition control group; 4, miR-488-3p inhibition group; 5, RocA group; 6, miR-488-3p inhibition+RocA group. 图 3 HK-2细胞中cleaved caspase-3、Bax、cGAS、STING蛋白检测 Fig.3 Detection of cleaved caspase-3, Bax, cGAS, and STING proteins in HK-2 cells

3 讨论

AKI已被公认为影响全球数百万患者的重大公共卫生问题[8-9]。本研究通过缺氧复氧处理肾小管上皮细胞HK-2模拟体内AKI过程,结果发现炎症反应参与了HK-2细胞的损伤过程,与其他研究[10]结果一致。

研究显示,ROS产生过量引起的氧化应激是肾小管上皮细胞损伤的主要原因[11],SOD可抑制随后的脂质过氧化,而MDA可促进脂质过氧化,从而对细胞造成损伤[12]。本研究中,HR组HK-2细胞中SOD水平低于对照组,ROS平均荧光强度、MDA水平高于对照组,证实了缺氧复氧诱导的HK-2细胞存在氧化应激。ROS参与肾损伤的发生和发展,破坏线粒体功能,促进炎症,加速细胞凋亡[13]。cleaved caspase-3是由caspase-3剪切后形成,被认为是细胞凋亡的标志[14]。抑制Bax表达可改善缺氧复氧诱导的肾小管上皮细胞凋亡[15]。本研究中,HR组HK-2细胞凋亡率、cleaved caspase-3、Bax蛋白表达水平均高于对照组,表明缺氧复氧诱导了HK-2细胞凋亡。提示抑制炎症、氧化应激及细胞凋亡可能是减轻缺氧复氧诱导的HK-2细胞损伤的有效途径。

miR-488可抑制缺氧复氧心肌H9c2细胞氧化应激和细胞凋亡,进而减轻细胞损伤[16]。本研究中,经缺氧复氧处理后的HK-2细胞中miR-488-3p表达上调,于是对缺氧复氧诱导的HK-2细胞进行了下调miR-488-3p表达的处理,结果发现,下调miR-488-3p表达可抑制缺氧复氧诱导的HK-2细胞炎症、氧化应激及细胞凋亡,进而减轻细胞损伤。提示miR-488-3p可能成为治疗AKI的潜在有效靶点之一。

cGAS-STING通路在肾损伤中起着至关重要的作用[17]。如抑制cGAS-STING通路可减少顺铂诱导的人肾小管上皮细胞HKC-8凋亡,缓解炎症,改善氧化应激,缓解AKI[18]。本研究中,与HR组比较,RocA组HK-2细胞中cGAS、STING蛋白表达上调,炎症反应、氧化应激及细胞凋亡增加。为了进一步验证以上结果,本研究用cGAS-STING通路激活剂RocA设置了回复实验,结果显示,RocA逆转了下调miR-488-3p表达对缺氧复氧诱导的HK-2细胞炎症、氧化应激及细胞凋亡的影响。进一步证实cGAS-STING通路的激活参与了缺氧复氧诱导的HK-2细胞损伤过程。

综上所述,本研究发现下调miR-488-3p表达能够抑制缺氧复氧诱导的HK-2细胞炎症、氧化应激及细胞凋亡,进而减轻细胞损伤,其机制可能与抑制cGAS-STING通路激活有关。本研究结果可能为AKI的治疗提供新的参考依据。

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