BACKGROUND Pediatric enteritis is one of the infectious diseases in the digestive system that causes a variety of digestive problems,including diarrhea,vomiting,and bellyache in children.Clinically,Helicobacter pylori...BACKGROUND Pediatric enteritis is one of the infectious diseases in the digestive system that causes a variety of digestive problems,including diarrhea,vomiting,and bellyache in children.Clinically,Helicobacter pylori(H.pylori)infection is one of the common factors to cause pediatric enteritis.It has been demonstrated that aberrant expression of microRNAs(miRNAs)is found in gastrointestinal diseases caused by H.pylori,and we discovered a significant increase of miR-32-5p in H.pylori-related pediatric enteritis.However,the exact role of miR-32-5p in it is still unknown.AIM To investigate the role of aberrant miR-32-5p in pediatric enteritis induced by H.pylori.METHODS MiR-32-5p expression was detected by quantitative real time-polymerase chain reaction.The biological role of miR-32-5p in H.pylori-treated intestinal epithelial cells was evaluated by Cell Counting Kit-8 assay and flow cytometry.The potential target of miR-32-5p was predicted with TargetScanHuman and verified by luciferase assay.The downstream mechanism of miR-32-5p was explored by using molecular biology methods.RESULTS We found that miR-32-5p was overexpressed in serum of H.pylori-induced pediatric enteritis.Further investigation revealed that H.pylori infection promoted the death of intestinal epithelial cells,and increased miR-32-5p expression.Moreover,miR-32-5p mimic further facilitated apoptosis and inflammatory cytokine secretion of intestinal epithelial cells.Further exploration revealed that SMAD family member 6(SMAD6)was the direct target of miR-32-5p,and SMAD6 overexpression partially rescued cell damage induced by H.pylori.The following experiments showed that miR-32-5p/SMAD6 participated in the apoptosis of intestinal epithelial cells induced by transforming growth factor-β-activated kinase 1(TAK1)-p38 activation under H.pylori infection.CONCLUSION Our work uncovered the crucial role of aberrant expression of miR-32-5p in H.pylori–related pediatric enteritis,and suggested that the TAK1-p38 pathway is involved in it.展开更多
目的研究微RNA(microRNA,miRNA)-32-5p(miR-32-5p)对载脂蛋白E(apolipoprotein E,ApoE)基因敲除(ApoE^(-/-))小鼠动脉粥样硬化的作用及其是否通过信号转导和转录活化因子3(signal transducer and activator of transcription 3,STAT3)/...目的研究微RNA(microRNA,miRNA)-32-5p(miR-32-5p)对载脂蛋白E(apolipoprotein E,ApoE)基因敲除(ApoE^(-/-))小鼠动脉粥样硬化的作用及其是否通过信号转导和转录活化因子3(signal transducer and activator of transcription 3,STAT3)/磷酸酶及张力蛋白同源物(phosphates and tensin homologue deleted on chromosome ten,PTEN)通路影响巨噬细胞极化与动脉粥样硬化之间的联系。方法将6~8周龄动脉粥样硬化雄性ApoE^(-/-)小鼠随机分为实验组和模型组,实验组通过给小鼠注射miR-32-5p慢病毒构建过表达模型,模型组注射同等剂量生理盐水。4周后解剖小鼠,留取主动脉组织常规石蜡切片,采用苏木精-伊红(hematoxylin and eosin staining,HE)染色、免疫组化、免疫荧光法分别检测主动脉斑块面积及斑块内巨噬细胞含量;通过Western blotting(WB)检测主动脉斑块和体外培养巨噬细胞中磷酸化的信号转导和转录活化因子3(phosphorylated signal transducer and activator of transcription 3,p-STAT3)、PTEN、CCAAT增强子结合蛋白β(CCAT/enhancer-binding protein beta,C/EBP-β)等相关蛋白表达量。结果与模型组相比,实验组小鼠主动脉斑块面积明显缩小(Z=-3.477,P<0.01)、斑块内巨噬细胞数减少(Z=-3.628,P<0.01)、巨噬细胞向M2表型转化(Z=-3.628,P<0.01)。WB提示实验组p-STAT3(t=-10.381,P<0.01)、C/EBPβ(t=-6.205,P<0.01)表达量升高,而PTEN(t=7.057,P<0.01)表达量降低;M2型巨噬细胞标记物甘露糖受体/CD206(mannose receptor/CD206)(t=-5.386,P<0.01)、精氨酸酶(arginase)(t=-4.486,P<0.01)、发现于炎症区域(found in inflammatory zone,FIZZ)(t=-5.701,P<0.01)的表达量升高;体外实验同样显示实验组CD206(t=-11.431,P<0.01)、p-STAT3(t=-12.401,P<0.01)、C/EBP-β(t=-4.755,P<0.01)表达升高,PTEN(t=21.729,P<0.01)表达降低。结论miR-32-5p过表达可通过激活STAT3通路抑制PTEN,促进巨噬细胞向M2表型转化,发挥保护动脉粥样硬化的作用。展开更多
文摘BACKGROUND Pediatric enteritis is one of the infectious diseases in the digestive system that causes a variety of digestive problems,including diarrhea,vomiting,and bellyache in children.Clinically,Helicobacter pylori(H.pylori)infection is one of the common factors to cause pediatric enteritis.It has been demonstrated that aberrant expression of microRNAs(miRNAs)is found in gastrointestinal diseases caused by H.pylori,and we discovered a significant increase of miR-32-5p in H.pylori-related pediatric enteritis.However,the exact role of miR-32-5p in it is still unknown.AIM To investigate the role of aberrant miR-32-5p in pediatric enteritis induced by H.pylori.METHODS MiR-32-5p expression was detected by quantitative real time-polymerase chain reaction.The biological role of miR-32-5p in H.pylori-treated intestinal epithelial cells was evaluated by Cell Counting Kit-8 assay and flow cytometry.The potential target of miR-32-5p was predicted with TargetScanHuman and verified by luciferase assay.The downstream mechanism of miR-32-5p was explored by using molecular biology methods.RESULTS We found that miR-32-5p was overexpressed in serum of H.pylori-induced pediatric enteritis.Further investigation revealed that H.pylori infection promoted the death of intestinal epithelial cells,and increased miR-32-5p expression.Moreover,miR-32-5p mimic further facilitated apoptosis and inflammatory cytokine secretion of intestinal epithelial cells.Further exploration revealed that SMAD family member 6(SMAD6)was the direct target of miR-32-5p,and SMAD6 overexpression partially rescued cell damage induced by H.pylori.The following experiments showed that miR-32-5p/SMAD6 participated in the apoptosis of intestinal epithelial cells induced by transforming growth factor-β-activated kinase 1(TAK1)-p38 activation under H.pylori infection.CONCLUSION Our work uncovered the crucial role of aberrant expression of miR-32-5p in H.pylori–related pediatric enteritis,and suggested that the TAK1-p38 pathway is involved in it.
文摘目的研究微RNA(microRNA,miRNA)-32-5p(miR-32-5p)对载脂蛋白E(apolipoprotein E,ApoE)基因敲除(ApoE^(-/-))小鼠动脉粥样硬化的作用及其是否通过信号转导和转录活化因子3(signal transducer and activator of transcription 3,STAT3)/磷酸酶及张力蛋白同源物(phosphates and tensin homologue deleted on chromosome ten,PTEN)通路影响巨噬细胞极化与动脉粥样硬化之间的联系。方法将6~8周龄动脉粥样硬化雄性ApoE^(-/-)小鼠随机分为实验组和模型组,实验组通过给小鼠注射miR-32-5p慢病毒构建过表达模型,模型组注射同等剂量生理盐水。4周后解剖小鼠,留取主动脉组织常规石蜡切片,采用苏木精-伊红(hematoxylin and eosin staining,HE)染色、免疫组化、免疫荧光法分别检测主动脉斑块面积及斑块内巨噬细胞含量;通过Western blotting(WB)检测主动脉斑块和体外培养巨噬细胞中磷酸化的信号转导和转录活化因子3(phosphorylated signal transducer and activator of transcription 3,p-STAT3)、PTEN、CCAAT增强子结合蛋白β(CCAT/enhancer-binding protein beta,C/EBP-β)等相关蛋白表达量。结果与模型组相比,实验组小鼠主动脉斑块面积明显缩小(Z=-3.477,P<0.01)、斑块内巨噬细胞数减少(Z=-3.628,P<0.01)、巨噬细胞向M2表型转化(Z=-3.628,P<0.01)。WB提示实验组p-STAT3(t=-10.381,P<0.01)、C/EBPβ(t=-6.205,P<0.01)表达量升高,而PTEN(t=7.057,P<0.01)表达量降低;M2型巨噬细胞标记物甘露糖受体/CD206(mannose receptor/CD206)(t=-5.386,P<0.01)、精氨酸酶(arginase)(t=-4.486,P<0.01)、发现于炎症区域(found in inflammatory zone,FIZZ)(t=-5.701,P<0.01)的表达量升高;体外实验同样显示实验组CD206(t=-11.431,P<0.01)、p-STAT3(t=-12.401,P<0.01)、C/EBP-β(t=-4.755,P<0.01)表达升高,PTEN(t=21.729,P<0.01)表达降低。结论miR-32-5p过表达可通过激活STAT3通路抑制PTEN,促进巨噬细胞向M2表型转化,发挥保护动脉粥样硬化的作用。
