BACKGROUND Obesity is associated with an increased risk of developing Crohn’s disease(CD),higher disease activity,and comparatively worse clinical outcomes.AIM To investigate the role of mesenteric adipose tissue-der...BACKGROUND Obesity is associated with an increased risk of developing Crohn’s disease(CD),higher disease activity,and comparatively worse clinical outcomes.AIM To investigate the role of mesenteric adipose tissue-derived exosomes in the pathogenesis of CD aggravation in obese individuals.METHODS First,we induced colitis in mice initiated on high-fat and normal diets and compared the severity of colitis.We then extracted and identified exosomes from mesenteric adipose tissue and determined the levels of metastasis-associated lung adenocarcinoma transcript 1(MALAT1)in mesenteric adipose tissue-derived exosomes and the colon.Next,we demonstrated an interaction between MALAT1 and the miR-15a-5p/activating transcription factor 6(ATF6)axis.Finally,we explored the effects of mesenteric adipose tissue-derived exosomes extracted from mice fed a high-fat or normal diet on the severity of 2,4,6-trinitrobe-nzenesulfonic acid(TNBS)-induced colitis and ATF6-related endoplasmic reticulum stress pathways.RESULTS High-fat diet was found to aggravate TNBS-induced colitis in mice.The expression of MALAT1 in mesenteric adipose tissue-derived exosomes of high-fat diet-fed mice increased.The increased expression of MALAT1 in colon tissue exacerbated TNBS-induced colitis and activated the ATF6 endoplasmic reticulum stress pathway.This effect was partially reversed by the reduced expression of MALAT1 and overexpression of miR-15a-5p.CONCLUSION Mesenteric adipose tissue-derived exosome-encapsulated long noncoding RNAs MALAT1 targets the colon and aggravates TNBS-induced colitis in obese mice,which may potentially act on the miR-15a-5p/ATF6 axis and activate endoplasmic reticulum stress.展开更多
目的探讨长链非编码RNA(long non-coding RNA,lncRNA)肺腺癌转录子1(MALAT1)以及下游调控蛋白高迁移率族蛋白B1(High-mobility group protein box-1,HMGB1)在缺血后处理降低大鼠心肌缺血-再灌注损伤(ischemia/reperfusion injury,IRI)...目的探讨长链非编码RNA(long non-coding RNA,lncRNA)肺腺癌转录子1(MALAT1)以及下游调控蛋白高迁移率族蛋白B1(High-mobility group protein box-1,HMGB1)在缺血后处理降低大鼠心肌缺血-再灌注损伤(ischemia/reperfusion injury,IRI)中的作用。方法将24只大鼠饲养7天后,随机分成3组:假手术(Sham)组、缺血再灌注(ischemia/reperfusion,IR)组、缺血后处理(ischemic post-conditioning,IPO)组。模型构建完毕24 h进行检测大鼠血清中心肌肌钙蛋白I(cTnI)和白介素6(IL-6)表达水平,取材检测大鼠心肌梗死面积,检测大鼠心肌组织中MALAT1转录表达水平的差异,HMGB1、Toll样受体4(Toll-like receptor4,TLR4)蛋白含量差异。结果与Sham组比较,IR、IPO组血清中cTnI、IL-6水平明显升高,心肌梗死面积明显增加,心肌组织中MALAT1表达水平显著上调,HMGB1、TLR4水平明显升高(P<0.05)。与IR组比较,IPO组cTnI浓度显著降低,心肌梗死面积显著减小,心肌组织中lncRNA-MALAT1相对表达量降低,HMGB1、TLR4蛋白含量降低(P<0.05)。结论及时的缺血后处理可有效减缓大鼠心肌缺血-再灌注的损伤程度,其相关机制可能与抑制MALAT1调节控制HMGB1、TLR4表达水平之间有一定的关联。展开更多
基金Supported by the National Natural Science Foundation of China,No.81770574the Natural Science Foundation of Zhejiang Province,No.LZ21H030002 and No.LY21H030005.
文摘BACKGROUND Obesity is associated with an increased risk of developing Crohn’s disease(CD),higher disease activity,and comparatively worse clinical outcomes.AIM To investigate the role of mesenteric adipose tissue-derived exosomes in the pathogenesis of CD aggravation in obese individuals.METHODS First,we induced colitis in mice initiated on high-fat and normal diets and compared the severity of colitis.We then extracted and identified exosomes from mesenteric adipose tissue and determined the levels of metastasis-associated lung adenocarcinoma transcript 1(MALAT1)in mesenteric adipose tissue-derived exosomes and the colon.Next,we demonstrated an interaction between MALAT1 and the miR-15a-5p/activating transcription factor 6(ATF6)axis.Finally,we explored the effects of mesenteric adipose tissue-derived exosomes extracted from mice fed a high-fat or normal diet on the severity of 2,4,6-trinitrobe-nzenesulfonic acid(TNBS)-induced colitis and ATF6-related endoplasmic reticulum stress pathways.RESULTS High-fat diet was found to aggravate TNBS-induced colitis in mice.The expression of MALAT1 in mesenteric adipose tissue-derived exosomes of high-fat diet-fed mice increased.The increased expression of MALAT1 in colon tissue exacerbated TNBS-induced colitis and activated the ATF6 endoplasmic reticulum stress pathway.This effect was partially reversed by the reduced expression of MALAT1 and overexpression of miR-15a-5p.CONCLUSION Mesenteric adipose tissue-derived exosome-encapsulated long noncoding RNAs MALAT1 targets the colon and aggravates TNBS-induced colitis in obese mice,which may potentially act on the miR-15a-5p/ATF6 axis and activate endoplasmic reticulum stress.
文摘目的探讨长链非编码RNA(long non-coding RNA,lncRNA)肺腺癌转录子1(MALAT1)以及下游调控蛋白高迁移率族蛋白B1(High-mobility group protein box-1,HMGB1)在缺血后处理降低大鼠心肌缺血-再灌注损伤(ischemia/reperfusion injury,IRI)中的作用。方法将24只大鼠饲养7天后,随机分成3组:假手术(Sham)组、缺血再灌注(ischemia/reperfusion,IR)组、缺血后处理(ischemic post-conditioning,IPO)组。模型构建完毕24 h进行检测大鼠血清中心肌肌钙蛋白I(cTnI)和白介素6(IL-6)表达水平,取材检测大鼠心肌梗死面积,检测大鼠心肌组织中MALAT1转录表达水平的差异,HMGB1、Toll样受体4(Toll-like receptor4,TLR4)蛋白含量差异。结果与Sham组比较,IR、IPO组血清中cTnI、IL-6水平明显升高,心肌梗死面积明显增加,心肌组织中MALAT1表达水平显著上调,HMGB1、TLR4水平明显升高(P<0.05)。与IR组比较,IPO组cTnI浓度显著降低,心肌梗死面积显著减小,心肌组织中lncRNA-MALAT1相对表达量降低,HMGB1、TLR4蛋白含量降低(P<0.05)。结论及时的缺血后处理可有效减缓大鼠心肌缺血-再灌注的损伤程度,其相关机制可能与抑制MALAT1调节控制HMGB1、TLR4表达水平之间有一定的关联。