Article(id=1200024242159973306, tenantId=1146029695717560320, journalId=1189873630562394117, issueId=1200024241572770746, articleNumber=null, orderNo=null, doi=10.11855/j.issn.0577-7402.1515.2022.0630, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1626019200000, receivedDateStr=2021-07-12, revisedDate=null, revisedDateStr=null, acceptedDate=1637856000000, acceptedDateStr=2021-11-26, onlineDate=1764037674703, onlineDateStr=2025-11-25, pubDate=1695830400000, pubDateStr=2023-09-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1764037674703, onlineIssueDateStr=2025-11-25, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1764037674703, creator=13701087609, updateTime=1764037674703, updator=13701087609, issue=Issue{id=1200024241572770746, tenantId=1146029695717560320, journalId=1189873630562394117, year='2023', volume='48', issue='9', pageStart='993', pageEnd='1112', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1764037674563, creator=13701087609, updateTime=1764038723302, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1200028640353288193, tenantId=1146029695717560320, journalId=1189873630562394117, issueId=1200024241572770746, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1200028640353288194, tenantId=1146029695717560320, journalId=1189873630562394117, issueId=1200024241572770746, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1017, endPage=1022, ext={EN=ArticleExt(id=1200024243363738556, articleId=1200024242159973306, tenantId=1146029695717560320, journalId=1189873630562394117, language=EN, title=The influence of exosomal miR-155 derived from monocytes stimulated by heat stress on the inflammatory response of hepatocytes, columnId=1190310110212751762, journalTitle=Medical Journal of Chinese People’s Liberation Army, columnName=Basic Research, runingTitle=null, highlight=null, articleAbstract=

Objective To observe the influence of exosomal miR-155 derived from monocytes stimulated by heat stress on the inflammatory response of hepatocytes. Methods According to different treatments, we termed THP-1 monocytes into the control group, the heat stress group, and the ulinasatin group. We then extracted the exosomes from each group. To study the function of exsome on hepatocytes, we incubated hepatocytes with these exosomes. We then tested the alanine aminotransferase and lactate dehydrogenase levels in the supernatant, measured cell viability, and detected the relative mRNA levels of tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) in the hepatocytes. Then, the expression changes of exosomal miR-155 derived from monocytes were detected using RT-qPCR. Furthermore, the potential target of miR-155 was analyzed using database retrieval, dual-luciferase report, and Western blotting assay. Finally, the effect of monocyte exosomes on hepatocyte miR-155 and the treatment with ulinastatin or miR-155 inhibitor on hepatocyte injury were observed. Results When incubating hepatocytes with the exosomes derived from monocytes stimulated by heat stress, the levels of alanine aminotransferase and lactate dehydrogenase in the supernatant and the mRNA levels of TNF-α and IL-6 in hepatocytes were all significantly increased (P<0.01) with decreased cell survival rate (P<0.05). Heat stress increased the level of miR-155 contained in monocytes and their release of exosomes. Database retrieval, dual-luciferase reports, and Western blotting assay showed that miR-155 might target SOCS1. The exosomes from monocytes stimulated by heat stress increased miR-155 in liver cells. Ulinastatin or miR-155 inhibitor could reduce the exosomal miR-155 level and decrease TNF-α and IL-6 mRNA expression in liver cells. The difference was statistically significant (P<0.05). Conclusion The monocytes stimulated by heat stress increase the inflammatory response of hepatocytes, which may be associated with increased exosomal miR-155 using SOCS1 as a potential target. Ulinastatin may relieve the hepatocytic mRNA expression of inflammatory cytokines in this setting.

, correspAuthors=Hua-Sheng Tong, authorNote=null, correspAuthorsNote=
E-mail:
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目的 研究热打击单核细胞来源外泌体对肝细胞炎症损伤的影响及其与外泌体miR-155的关系。方法 将单核细胞THP-1分为对照组、热打击组、乌司他丁组,分别提取3组细胞的外泌体,将其孵育肝细胞系HepG2细胞后,检测肝细胞上清中谷丙转氨酶(ALT)、乳酸脱氢酶(LDH)水平,肝细胞存活率,以及肝细胞肿瘤坏死因子-α(TNF-α)与白细胞介素-6(IL-6) mRNA水平,评估外泌体对肝细胞的作用;采用RT-qPCR检测单核细胞来源外泌体中miR-155含量的变化;通过数据库检索、双重荧光素酶报告基因检测及Western blotting实验分析miR-155的潜在靶点;观察热打击单核细胞外泌体对肝细胞miR-155的影响,以及使用乌司他丁或miR-155抑制剂处理对这些外泌体功能的影响。结果 热打击单核细胞来源外泌体使肝细胞上清ALT及LDH水平、TNF-α mRNA及IL-6 mRNA水平明显增高(P<0.01),细胞存活率下降(P<0.05);热打击能增加单核细胞及其释放外泌体内含的miR-155水平;miR-155可能以细胞因子信号传导抑制分子1(SOCS1)作为靶基因发挥作用;采用热打击单核细胞外泌体孵育肝细胞可使后者miR-155水平增高,乌司他丁或miR-155抑制剂能降低热打击单核细胞外泌体miR-155水平并减少肝细胞TNF-αIL-6 mRNA的表达,差异有统计学意义(P<0.05)。结论 热打击单核细胞可上调肝细胞炎性因子导致的炎症损伤,这可能是通过释放外泌体miR-155至肝细胞并以SOCS1为潜在靶点实现的;乌司他丁可能缓解此条件下肝细胞内炎性因子mRNA的表达。

, correspAuthors=童华生, authorNote=null, correspAuthorsNote=
童华生,E-mail:
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张明,博士研究生,副主任医师,主要从事中暑及脓毒症方面的研究

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ALT. 谷丙转氨酶;LDH. 乳酸脱氢酶;与对照组比较,(1)P<0.05;与热打击组比较,(2)P<0.05

, figureFileSmall=ACV+ZbV0yPOy2UqOnWnf1A==, figureFileBig=8jSkQsM2coH2kGhaFUHdCw==, tableContent=null), ArticleFig(id=1200066180909200210, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=EN, label=Fig.2, caption=The expression of miR-155 in the monocytes and the exosome derived from monocytes, figureFileSmall=Lc96C7/UFl4OphGiWR5e5Q==, figureFileBig=VvkUnEYTSOo2AP66HvpRuw==, tableContent=null), ArticleFig(id=1200066180976309077, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=CN, label=图2, caption=单核细胞及其来源外泌体内miR-155水平

与对照组比较,(1)P<0.05;与热打击组比较,(2)P<0.05

, figureFileSmall=Lc96C7/UFl4OphGiWR5e5Q==, figureFileBig=VvkUnEYTSOo2AP66HvpRuw==, tableContent=null), ArticleFig(id=1200066181064389464, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=EN, label=Fig.3, caption=miR-155 regulates the inflammatory damage of liver cells in a SOCS1-dependent manner, figureFileSmall=NbwhEfqiSdZ3Q2Coo7tLmQ==, figureFileBig=BDlrN3zYtJhWejfoVFT8rQ==, tableContent=null), ArticleFig(id=1200066181135692636, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=CN, label=图3, caption=miR-155通过靶向SOCS1调控肝脏炎症反应

A. 生物信息学工具预测SOCS1是miR-155的靶基因;B. 双重荧光素酶报告实验检测miR-155模拟物对SOCS1基因转录水平的影响,与miR对照组比较,(1)P<0.05;C. Western blotting检测各组外泌体对肝细胞内SOCS1、p-NF-κB蛋白表达的影响,与对照组比较,(1)P<0.05;与热打击组比较,(2)P<0.05;D. RT-PCR检测转染miR-155抑制物及siSOCS1后热打击肝细胞的炎性因子水平,(1)P<0.05

, figureFileSmall=NbwhEfqiSdZ3Q2Coo7tLmQ==, figureFileBig=BDlrN3zYtJhWejfoVFT8rQ==, tableContent=null), ArticleFig(id=1200066181223773023, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=EN, label=Fig. 4, caption=The monocytes stimulated by heat stress affect hepatocyte inflammation by exosome containing miR-155, figureFileSmall=5l5+4JwFuhamBkXqhLDKUg==, figureFileBig=KRlswMHatAOClHbm3TJGPg==, tableContent=null), ArticleFig(id=1200066181320242018, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=CN, label=图4, caption=热打击单核细胞通过内含miR-155影响肝细胞炎症反应

A. 经各组单核细胞来源外泌体处理的肝细胞内miR-155表达水平;与对照组比较,(1)P<0.05;与热打击组比较,(2)P<0.05。B. 转染了阴性对照和miR-155抑制剂的热打击单核细胞来源外泌体作用于肝细胞。C. 热打击单核细胞来源外泌体处理转染了阴性对照和miR-155的肝细胞。D. 热打击单核细胞来源外泌体处理转染了阴性对照和miR-155模拟剂的肝细胞。所有实验独立重复3次。与阴性对照比较,(1)P<0.05

, figureFileSmall=5l5+4JwFuhamBkXqhLDKUg==, figureFileBig=KRlswMHatAOClHbm3TJGPg==, tableContent=null), ArticleFig(id=1200066181429293925, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=EN, label=Tab.1, caption=

The primer sequences in the study

, figureFileSmall=null, figureFileBig=null, tableContent=
基因 引物序列(5'→3')
miR-155 正向:GGGGTAATGCTAATCGTGA
反向:CAGTGCGTGTCGTGGAG
TNF-α 正向:CTTCTCATTCCTGCTTGTG
反向:ACTTGGTGGTTTGCTACG
IL-6 正向:GGCGGATCGGATGTTGTGAT
反向:GGACCCCAGACAATCGGTTG
GAPDH 正向:CAATGTGTCCGTCGTGGATCT
反向:GTCCTCAGTGTAGCCCAAGATG
U6 正向:CGAGCACAGAATCGCTTCA
反向:CTCGCTTCGGCAGCACATAT
), ArticleFig(id=1200066181521568614, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1200024242159973306, language=CN, label=表1, caption=

基因引物序列

, figureFileSmall=null, figureFileBig=null, tableContent=
基因 引物序列(5'→3')
miR-155 正向:GGGGTAATGCTAATCGTGA
反向:CAGTGCGTGTCGTGGAG
TNF-α 正向:CTTCTCATTCCTGCTTGTG
反向:ACTTGGTGGTTTGCTACG
IL-6 正向:GGCGGATCGGATGTTGTGAT
反向:GGACCCCAGACAATCGGTTG
GAPDH 正向:CAATGTGTCCGTCGTGGATCT
反向:GTCCTCAGTGTAGCCCAAGATG
U6 正向:CGAGCACAGAATCGCTTCA
反向:CTCGCTTCGGCAGCACATAT
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热打击单核细胞来源外泌体中miR-155对肝细胞炎症的影响及其机制
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张明 1 , 李悦 2 , 杨经文 1 , 施学智 2 , 肖吉彪 1 , 童华生 2, *
解放军医学杂志 | 基础研究 2023,48(9): 1017-1022
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解放军医学杂志 | 基础研究 2023, 48(9): 1017-1022
热打击单核细胞来源外泌体中miR-155对肝细胞炎症的影响及其机制
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张明1, 李悦2, 杨经文1, 施学智2, 肖吉彪1, 童华生2, *
作者信息
  • 1广州医科大学附属第六医院/清远市人民医院重症医学科一区,广东清远 511500
  • 2解放军南部战区总医院重症医学科/全军热区损伤与组织修复重点实验室,广东广州 510010
  • 张明,博士研究生,副主任医师,主要从事中暑及脓毒症方面的研究

通讯作者:

童华生,E-mail:
The influence of exosomal miR-155 derived from monocytes stimulated by heat stress on the inflammatory response of hepatocytes
Ming Zhang1, Yue Li2, Jing-Wen Yang1, Xue-Zhi Shi2, Ji-Biao Xiao1, Hua-Sheng Tong2, *
Affiliations
  • 1Department of Critical Care Medicine, the Sixth Affiliated Hospital of Guangzhou Medical University/Qingyuan People's Hospital, Qingyuan, Guangdong 511500, China
  • 2Department of Intensive Care Unit, General Hospital of Southern Theatre Command of PLA/Key Laboratory of Trauma and Tissue Repair of Tropical Area of PLA, Guangzhou, Guangdong 510010, China
出版时间: 2023-09-28 doi: 10.11855/j.issn.0577-7402.1515.2022.0630
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目的 研究热打击单核细胞来源外泌体对肝细胞炎症损伤的影响及其与外泌体miR-155的关系。方法 将单核细胞THP-1分为对照组、热打击组、乌司他丁组,分别提取3组细胞的外泌体,将其孵育肝细胞系HepG2细胞后,检测肝细胞上清中谷丙转氨酶(ALT)、乳酸脱氢酶(LDH)水平,肝细胞存活率,以及肝细胞肿瘤坏死因子-α(TNF-α)与白细胞介素-6(IL-6) mRNA水平,评估外泌体对肝细胞的作用;采用RT-qPCR检测单核细胞来源外泌体中miR-155含量的变化;通过数据库检索、双重荧光素酶报告基因检测及Western blotting实验分析miR-155的潜在靶点;观察热打击单核细胞外泌体对肝细胞miR-155的影响,以及使用乌司他丁或miR-155抑制剂处理对这些外泌体功能的影响。结果 热打击单核细胞来源外泌体使肝细胞上清ALT及LDH水平、TNF-α mRNA及IL-6 mRNA水平明显增高(P<0.01),细胞存活率下降(P<0.05);热打击能增加单核细胞及其释放外泌体内含的miR-155水平;miR-155可能以细胞因子信号传导抑制分子1(SOCS1)作为靶基因发挥作用;采用热打击单核细胞外泌体孵育肝细胞可使后者miR-155水平增高,乌司他丁或miR-155抑制剂能降低热打击单核细胞外泌体miR-155水平并减少肝细胞TNF-αIL-6 mRNA的表达,差异有统计学意义(P<0.05)。结论 热打击单核细胞可上调肝细胞炎性因子导致的炎症损伤,这可能是通过释放外泌体miR-155至肝细胞并以SOCS1为潜在靶点实现的;乌司他丁可能缓解此条件下肝细胞内炎性因子mRNA的表达。

中暑  /  外泌体  /  单核细胞  /  乌司他丁  /  肝细胞  /  miR-155

Objective To observe the influence of exosomal miR-155 derived from monocytes stimulated by heat stress on the inflammatory response of hepatocytes. Methods According to different treatments, we termed THP-1 monocytes into the control group, the heat stress group, and the ulinasatin group. We then extracted the exosomes from each group. To study the function of exsome on hepatocytes, we incubated hepatocytes with these exosomes. We then tested the alanine aminotransferase and lactate dehydrogenase levels in the supernatant, measured cell viability, and detected the relative mRNA levels of tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) in the hepatocytes. Then, the expression changes of exosomal miR-155 derived from monocytes were detected using RT-qPCR. Furthermore, the potential target of miR-155 was analyzed using database retrieval, dual-luciferase report, and Western blotting assay. Finally, the effect of monocyte exosomes on hepatocyte miR-155 and the treatment with ulinastatin or miR-155 inhibitor on hepatocyte injury were observed. Results When incubating hepatocytes with the exosomes derived from monocytes stimulated by heat stress, the levels of alanine aminotransferase and lactate dehydrogenase in the supernatant and the mRNA levels of TNF-α and IL-6 in hepatocytes were all significantly increased (P<0.01) with decreased cell survival rate (P<0.05). Heat stress increased the level of miR-155 contained in monocytes and their release of exosomes. Database retrieval, dual-luciferase reports, and Western blotting assay showed that miR-155 might target SOCS1. The exosomes from monocytes stimulated by heat stress increased miR-155 in liver cells. Ulinastatin or miR-155 inhibitor could reduce the exosomal miR-155 level and decrease TNF-α and IL-6 mRNA expression in liver cells. The difference was statistically significant (P<0.05). Conclusion The monocytes stimulated by heat stress increase the inflammatory response of hepatocytes, which may be associated with increased exosomal miR-155 using SOCS1 as a potential target. Ulinastatin may relieve the hepatocytic mRNA expression of inflammatory cytokines in this setting.

heat stroke  /  exosome  /  monocyte  /  ulinastatin  /  hepatocytes  /  miR-155
张明, 李悦, 杨经文, 施学智, 肖吉彪, 童华生. 热打击单核细胞来源外泌体中miR-155对肝细胞炎症的影响及其机制. 解放军医学杂志, 2023 , 48 (9) : 1017 -1022 . DOI: 10.11855/j.issn.0577-7402.1515.2022.0630
Ming Zhang, Yue Li, Jing-Wen Yang, Xue-Zhi Shi, Ji-Biao Xiao, Hua-Sheng Tong. The influence of exosomal miR-155 derived from monocytes stimulated by heat stress on the inflammatory response of hepatocytes[J]. Medical Journal of Chinese People’s Liberation Army, 2023 , 48 (9) : 1017 -1022 . DOI: 10.11855/j.issn.0577-7402.1515.2022.0630
随着全球气候变暖,重症中暑的发病率、致残率及病死率在全世界范围内居高不下[1]。中暑诱发的肝功能障碍是其最严重的并发症,目前尚无有效的干预措施。目前中暑导致肝损伤的机制尚不明确,主流观点认为,重症中暑的本质是热刺激引发的、能导致患者器官功能障碍的炎症损伤性疾病[2]
中暑炎症反应传导至肝脏并致病的具体机制仍然是中暑相关研究的技术难题[3]。作为炎性介质的重要来源,单核巨噬细胞可在免疫相关疾病中发挥促炎作用,它们分泌的外泌体是一种胞外囊泡,其内含物主要包括蛋白、微RNA(microRNA,miRNA)等,能够在细胞与组织之间传导生物学信号而介导炎症反应[4]。本课题组前期研究发现,外泌体可能在中暑后炎症传导过程中导致肝脏细胞发生损伤[5],且外泌体内包含的miRNA也能够参与肝细胞炎症反应[6],提示源自单核细胞的外泌体及其内含miRNA可能参与了包括肝脏损伤在内的中暑炎症损伤过程。乌司他丁作为一种临床常用的抑制炎症反应的药物,可控制重症中暑后的炎症反应,联合其他治疗方式还能降低多器官衰竭及死亡的发生率[7-8],但其具体的作用机制仍未明确。本研究旨在探讨热打击后单核细胞来源外泌体内miRNA的变化及其对肝细胞的作用,以及乌司他丁作为干预药物对肝细胞炎症损伤的影响。
THP-1、HepG2细胞系购自中国科学院典型培养物保藏委员会细胞库。ExoQuick外泌体提取试剂盒购自美国SBI公司;谷丙转氨酶(ALT)检测试剂盒购自中国南京建成工程研究所,乳酸脱氢酶(LDH)、细胞计数CCK-8试剂盒及荧光素酶检测试剂盒购自中国上海碧云天生物技术公司。RNA提取试剂盒、反转录试剂盒、实时荧光定量聚合酶链反应(RT-qPCR)试剂盒购自日本TaKaRa公司。细胞因子信号传导抑制分子1(SCOS1)、核因子κB(NF-κB)、β-肌动蛋白(β-actin)抗体购自美国Abcam公司。转染试剂Lipofectamine 3000购自美国Invitrogen公司。miR-155模拟物、抑制剂、siRNA、阴性对照均购自中国吉玛基因公司。乌司他丁购自广东天普生化医药股份有限公司。
将处于指数生长期的THP-1细胞培养在37 ℃、含5% CO2及10%去外泌体血清的培养基中,分为对照组、热打击组、乌司他丁组。热打击开始后,对照组细胞持续培养于37 ℃环境,热打击组及乌司他丁组在43 ℃敷箱中打击1 h,再转移至37 ℃环境复温9 h。乌司他丁组在热打击前,添加乌司他丁(5000 U/ml)至细胞上清中,余操作同热打击组。
收集各组单核细胞上清,采用ExoQuick外泌体提取试剂盒在同样条件下提取外泌体,操作过程严格按照说明书进行。在体外培养的肝细胞系HepG2上清中,分别加入对照组、热打击组及乌司他丁组单核细胞来源的外泌体样本10 μg,作用24 h。
采用RT-qPCR试剂盒提取THP-1及HepG2细胞总RNA,采用外泌体RNA提取试剂盒提取各组外泌体的全部RNA,使用加尾法反转录试剂盒完成miRNA反转录,再进行qPCR反应,引物序列见表1,以U6GAPDH基因作为内参照,计算外泌体及肝细胞内相关miRNA及mRNA的相对表达量,结果用2–ΔΔCt法进行相对定量分析。
采用比色法检测肝细胞上清ALT、LDH水平;采用CCK-8法检测肝细胞存活率。
使用TargetScan、PicTar及miRWalk数据库检索miR-155的潜在靶基因并取交集。
采用荧光素酶报告基因检测系统构建插入野生型SOCS1 3'-UTR序列的pGL3质粒,转染pGL3-luc-SOCS1质粒到293T细胞并接种于96孔板。24 h后,按照试剂盒操作流程,加入miR-155模拟物及其阴性对照各5 pmol,检测荧光素酶活性。
收集经外泌体刺激的各组肝细胞并提取总蛋白,采用BCA法测定蛋白浓度后,常规行SDS-PAGE凝胶电泳及PVDF膜转印,检测SCOS1、p-NF-κB及β-actin蛋白表达水平。
设立对照组、miRNA-155抑制剂组、siSCOS1组以及miRNA-155抑制剂+siSCOS1组,采用Lipofectamine 3000转染试剂,按试剂盒说明书方法分别将miRNA-155抑制剂、siSCOS1以及miRNA-155抑制剂+siSCOS1转染入HepG2肝细胞;将miR-155模拟物和miRNA对照转染到43 ℃热打击1 h的HepG2肝细胞。采用RT-qPCR检测TNF-α及IL-6 mRNA表达,方法同1.4。
采用SPSS 20.0软件进行统计分析。计量资料先经Kolmogorov-Smirnov检验是否符合正态分布,正态分布的变量以$\bar{x}±s$表示,两组间比较采用独立样本t检验,多组间比较采用方差分析,组间进一步两两比较采用Bonferroni方法。P<0.05为差异有统计学意义。
与对照组相比,热打击组肝细胞上清中ALT、LDH水平升高(P<0.01),肝细胞存活率降低(P<0.05),肝细胞内TNF-αIL-6 mRNA水平升高(P<0.01);而与热打击组比较,乌司他丁组ALT、LDH水平降低(P<0.01),肝细胞存活率升高(P<0.05),TNF-αIL-6 mRNA水平降低(P<0.01,图1)。
与对照组相比,热打击组单核细胞及其来源外泌体中miR-155水平均明显增高(P<0.01);乌司他丁组单核细胞及其来源外泌体中miR-155水平与热打击组比较则明显降低,差异有统计学意义(P<0.01,图2)。
数据库检索发现,SOCS1是miR-155的潜在靶点(图3A)。双重荧光素酶报告基因检测结果显示,采用miR-155模拟物干预后,荧光素酶活性明显下降(P<0.01,图3B)。
Western blotting结果显示,与对照组相比,热打击组肝细胞内SOCS1蛋白表达水平下降,p-NF-κB蛋白表达水平增高(P<0.05),而乌司他丁组SOCS1蛋白表达水平高于热打击组,p-NF-κB蛋白表达量低于热打击组(P<0.05,图3C)。
RT-PCR结果显示,与对照组比较,miRNA-155抑制剂组肝细胞内TNF-αIL-6 mRNA表达水平下降,siSOCS1组上升,miRNA-155抑制剂+siSCOS1组下降,差异有统计学意义(P<0.05,图3D)。
转染miR-155抑制剂的单核细胞在热打击后释放的外泌体,能使其孵育的肝细胞TNF-αIL-6 mRNA表达下降(P<0.05);孵育来自热打击组单核细胞外泌体的肝细胞,转染miR-155抑制剂能使其TNF-αIL-6 mRNA表达下降(P<0.05)。相反地,转染miR-155模拟物到经热刺激的肝细胞后,肝细胞内TNF-αIL-6 mRNA表达均增加,差异有统计学意义(P<0.01)(图4)。
单核细胞具有启动并级联放大炎症反应的作用,是机体免疫防御系统的重要组成部分。然而,在病理状态下,单核细胞介导的炎症反应也参与了介导组织脏器的损害[9-10]。在中暑这种同样属于炎症反应损伤靶器官的疾病中,目前也有单核细胞被激活的证据[11]。另外,作为一种胞外囊泡,外泌体携带的内含物介导了细胞间的信号传递,影响了免疫细胞和脏器实质细胞之间的功能互作[4]。本研究团队曾发现,外泌体内含物改变促进了中暑疾病炎症反应的进程[12]。值得注意的是,单核细胞活化后释放外泌体调控下级炎症反应的现象也很普遍,并被认为是疾病潜在治疗靶点之一[13]。但是在中暑研究领域,单核细胞外泌体的功能仍未被重视。为了观察单核细胞外泌体在热打击过程中的作用,本研究首先观察了这些外泌体对实质细胞——肝细胞的影响,发现热打击后单核细胞存在炎症相关基因表达的变化,并伴随着其来源外泌体内含调控基因的变化,进而影响了孵育的肝细胞,使其在存活率、炎症损伤方面发生改变。提示受到热刺激的单核细胞可能通过外泌体激活附近实质细胞的炎症反应。
为了初步了解单核细胞外泌体改变肝细胞的原因,本研究首先尝试观察了外泌体miRNA的表达变化。miRNA是一类非编码单链小RNA,主要通过抑制靶基因的表达来发挥调控作用。研究发现,包括单核细胞在内的免疫细胞能通过介导miRNA表达,参与至少60种疾病的致病过程,同时,外泌体能够携带、传递miRNA到达靶细胞,具有稳定、高效等特点[14]。miR-155是一种被广泛研究的miRNA,可通过NF-κB通路快速形成正反馈调节环路,活化炎症通路[15]。有研究表明,免疫细胞来源的miR-155会在炎症激活后,随着释放的微囊泡扩散,进而调控靶细胞微环境及炎症状态[16]。相似的,本研究也发现,热刺激后的单核细胞miR-155明显上调,并通过外囊泡传递增加靶细胞内miR-155水平,伴随了下游肝细胞炎症损伤。使用miR-155抑制剂等药物能缓解这一过程,与前人的研究结论类似。当然,外泌体内含物的改变是复杂多变的,本研究和很多类似研究都不能完全排除外泌体内其他miRNA或成分对靶细胞的影响,这也是本研究的不足。
SOCS1是细胞因子信号转导抑制因子(SOCS)蛋白家族成员,其典型特征是可变长度的N端区域,一个中心SH2结构域及一个C端保守的SOCS框[17]。大量研究证实,SOCS1是细胞内抑制炎症发展的关键成分之一,除了直接与Jak的结合、抑制JAK/STAT通路以外,还能结合下游NF-κB的p65亚基、抑制TLR信号通路,发挥炎症抑制作用[18-19]。不仅如此,早有学者通过生物信息学方法分析、实验验证,证实了SOCS1与miR-155的靶向关系:miR-155作为转录后调节因子,能促进靶基因SOCS1 mRNA降解,进而促进炎症反应[20]。基于这些研究成果,本研究通过数据库检索、双荧光素酶、Western blotting等,再次验证了miR-155和SOCS1的靶向关系,即验证了miR-155与SOCS1基因的结合位点,以及随着肝细胞内miR-155的变化,SOCS1呈下调趋势等。另外,SOCS1通路下游的NF-κB是很多炎症相关基因的转录激活因子,本研究也发现,随着SOCS1的下调,NF-κB表达明显增加,这可能是炎症基因活化的机制。由此综合分析,热打击的单核细胞可能通过外泌体传递miR-155,介导靶细胞SOCS1转录调控进而发挥促炎作用。
乌司他丁作为一种尿胰蛋白酶抑制剂,是临床上可获得的非特异性的抗炎药物,能改善包括脓毒症在内的炎症性疾病患者的预后,且仍有进一步拓宽临床适应证的价值和趋势[21-22]。现今,炎症调控治疗在类似脓毒症的中暑疾病里,也受到持续关注[7-8]。鉴于在活体内使用特异性抗炎药物的方案仍处于理论研究阶段,非特异性的抗炎药物乌司他丁在中暑治疗中的临床价值亟待更深入的探索。为了初步在体外证实乌司他丁干预免疫细胞对炎症反应的潜在影响,本研究使用乌司他丁作为干预单核细胞的治疗药物,结果显示,乌司他丁能缓解单核细胞表达和释放炎症性miR-155。这种外泌体在作用于实质细胞后,无论是在炎性因子的表达,还是炎症通路的蛋白方面,都表现出炎症缓解的表型。当然,本研究未对乌司他丁调控miRNA的具体机制进行分析,借鉴前人的研究结论推测,这种效果可能是通过抑制生成miR-155的转录因子实现的[15,23]
综上所述,热打击能刺激单核细胞促进肝细胞炎症性损伤,这可能是通过释放外泌体miR-155靶向肝细胞内SOCS1实现的。使用乌司他丁可能抑制热打击单核细胞释放外泌体miR-155,从而发挥潜在抑炎作用。
  • 广东省医学科研基金(A2021404)
  • 广东省中医药局科研项目(20212292)
  • 广东省清远市科技计划项目(200715164560747)
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2023年第48卷第9期
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doi: 10.11855/j.issn.0577-7402.1515.2022.0630
  • 接收时间:2021-07-12
  • 首发时间:2025-11-25
  • 出版时间:2023-09-28
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  • 收稿日期:2021-07-12
  • 录用日期:2021-11-26
基金
Medical Research Foundation of Guangdong Provincial(A2021404)
广东省医学科研基金(A2021404)
Traditional Chinese Medicine Scientific Research Project of Guangdong Traditional Chinese Medicine Bureau(20212292)
广东省中医药局科研项目(20212292)
Science and Technology Planning Project of Qingyuan City(200715164560747)
广东省清远市科技计划项目(200715164560747)
作者信息
    1广州医科大学附属第六医院/清远市人民医院重症医学科一区,广东清远 511500
    2解放军南部战区总医院重症医学科/全军热区损伤与组织修复重点实验室,广东广州 510010

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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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