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首页|期刊导航|中国病理生理杂志|前扣带回至伏隔核GABA能神经通路调控小鼠肠易激综合征及潜在机制研究

前扣带回至伏隔核GABA能神经通路调控小鼠肠易激综合征及潜在机制研究OA北大核心CSTPCD

Effect of anterior cingulate cortex-nucleus accumbens GABAergic cir-cuit on irritable bowel syndrome in mice and its underlying mechanisms

中文摘要英文摘要

目的:探讨前扣带回(ACC)至伏隔核(NAc)的γ-氨基丁酸(GABA)能神经通路对小鼠肠易激综合征(IBS)的调控作用及潜在机制.方法:(1)慢急性联合应激法(CACS)建立C57BL/6J小鼠IBS模型,分为正常组和IBS组(均n=8),通过行为学测试、肠动力实验和腹部退缩反射评分观察小鼠IBS样症状.(2)采用荧光金(FG)逆行追踪结合荧光免疫组织化学法检测ACC-NAc的GABA能通路和IBS小鼠ACC中GABA神经元兴奋性(均n=8).(3)在正常和IBS小鼠NAc分别注射1.5 μL生理盐水(NS)、GABAA受体拮抗剂荷包牡丹碱(BIC)或激动剂异四氢烟酸(Isog),并据此将小鼠分为3组(均n=8):NS组、BIC组和Isog组,观察其IBS样症状.(4)采用化学遗传法将腺相关病毒载体AAV2/9-mDlx-iCre-WPRE-pA定向注射于ACC,AAV2/2Retro Plus-hSyn-DIO-hM3D(Gq)-eGFP-WPRE-pA注射于NAc,小鼠分为4组(均n=8):NS(腹腔注射)+NS(NAc注射)组、NS+BIC组、氯氮平N-氧化物(CNO)+NS组和CNO+BIC组;或AAV2/2Retro-hSyn-DIO-hM4D(Gi)-EGFP-WPRE-pA注射于NAc,小鼠分为3组(均n=8):NS+NS组、NS+BIC组和CNO+NS组,酶联免疫吸附试验(ELISA)检测结肠组织中组胺和5-羟色胺(5-HT)的表达,并观察ACC-NAc的GABA能神经通路对小鼠IBS样症状的影响.结果:CACS诱导小鼠出现IBS样症状;FG逆行追踪结合免疫荧光组织化学实验结果显示,ACC的GABA神经元可以投射至NAc.NAc注射BIC后IBS小鼠的焦虑样行为、腹泻样症状和内脏超敏反应显著减轻(P<0.05).化学遗传法抑制投射至NAc的ACC内GABA能神经元可显著减轻IBS小鼠的症状(P<0.05).结论:ACCGABA-NAc神经通路可参与小鼠IBS样症状的调控,其机制可能与肠道组胺和5-HT的释放有关.

AIM:To investigate the effects of the γ-aminobutyric acid(GABAergic)neural pathway from the anterior cingulate cortex(ACC)to the nucleus accumbens(NAc)on the regulation of irritable bowel syndrome(IBS)and its underlying mechanisms in mice.METHODS:(1)A C57BL/6J mice model of IBS was established by using chronic acute combing stress(CACS).The mice were divided into a normal group and an IBS group(n=8).The presence of IBS-like symptoms was determined through behavioural tests,an intestinal motility test and abdominal withdrawal reflex scores.(2)Fluorescence gold(FG)retrograde tracing and immunohistochemistry were used to investigate the ACC-NAc GABAergic neural pathway and to examine the activation of GABA in the ACC in IBS mice(n=8).(3)A total of 1.5 μL of normal saline(NS),GABAA receptor antagonist bicuculline(BIC)or agonist isoguvacine hydrochloride(Isog)was ad-ministered via a preburied catheter into the NAc of mice in IBS and normal groups.The mice were randomly divided into three groups(n=8):NS group,BIC group and Isog group.IBS-like symptoms were assessed.(4)The mice were prein-jected with AAV2/9-mDlx-iCre-WPRE-pA in the ACC and AAV2/2Retro Plus-hSyn-DIO-hM3D(Gq)-eGFP-WPRE-pA in the NAc and subsequently divided into four groups(n=8):NS(intraperitoneal injection)+NS(NAc microinjection)group,NS+BIC group,clozapine N-oxide(CNO)+NS group and CNO+BIC group.The mice who received AAV2/2Retro-hSyn-DIO-hM4D(Gi)-EGFP-WPRE-pA in the NAc were randomly divided into three groups(n=8):NS+NS group,NS+BIC group and CNO+NS group.Enzyme-linked immunosorbent assay(ELISA)was employed to estimate the expression levels of histamine and 5-hydroxytryptamine(5-HT)in colon tissue,and the effects of GABAergic neural pathways from ACC to NAc on IBS were studied.RESULTS:CACS induced IBS-like symptoms in mice.The results of FG retrograde tracing combined with fluorescence immunohistochemistry showed that GABA neurons of ACC could project to NAc.The injection of BIC in the NAc was found to significantly reduce anxiety-like behaviours,diarrheal symptoms and visceral hy-persensitivity in the IBS mice(P<0.05).Chemogenetic inhibition of the ACC-NAc GABAergic neurons ameliorated IBS-like symptoms in mice(P<0.05).CONCLUSION:The GABAergic pathway of ACC-NAc might be involved in the regu-lation of IBS in mice,which may be related to the release of histamine and 5-HT in colon tissue.

郭瑞晓;郭菲菲;高胜利;冯旭菲;刘华;明星;孙金秋;栾心驰;刘震宇;刘蔚毅

青岛大学基础医学院生理学与病理生理学系,山东 青岛 266071青岛大学生物医学中心,山东 青岛 266071青岛大学附属医院消化内科,山东 青岛 266071青岛大学青岛医学院,山东 青岛 266071

基础医学

前扣带回伏隔核γ-氨基丁酸焦虑样行为肠易激综合征内脏超敏反应

anterior cingulate cortexnucleus accumbensγ-aminobutyric acidanxiety-like behaviorsirri-table bowel syndromevisceral hypersensitivity

《中国病理生理杂志》 2024 (005)

815-826 / 12

中国博士后科研基金资助项目(No.2018M632627);山东省大学生创新创业训练计划项目(No.S202311065054)

10.3969/j.issn.1000-4718.2024.05.006

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