肌肉质量对腹主动脉缩窄大鼠心脏结构和功能的影响  

Effect of muscle mass on cardiac structure and function in rats with abdominal aortic constriction

作　　者：李世田 陈雪飞 邢正 郭兰兰 张靓[1] LI Shitian;CHEN Xuefei;XING Zheng;GUO Lanlan;ZhANG Jing(College of Physical Education and Sports,Beijing Normal University,Beijing 100875,China;College of Physical Edu-cation,Zhengzhou University,Zhengzhou 450052,China;Department of Physical Education,University of International Business and Economics,Beijing 100875,China)

机构地区：[1]北京师范大学体育与运动学院,北京100875 [2]郑州大学体育学院,河南郑州450052 [3]对外经济贸易大学体育部,北京100875

出　　处：《中国病理生理杂志》2024年第7期1153-1162,共10页Chinese Journal of Pathophysiology

基　　金：国家自然科学基金资助项目(No.31871207)。

摘　　要：目的:探究骨骼肌质量对腹主动脉缩窄(AAC)大鼠心脏结构和功能的影响及可能机制。方法:(1)雄性SD大鼠30只,随机分为对照(CON)组、肌萎缩(MA)组和肌肥大(MH)组,每组10只。MA组通过去除后腿两侧胫神经构建双下肢MA模型,MH组通过负重跑构建MH模型。4周后取材,测定MA和MH指标。(2)在以上模型构建完成的基础上,另取大鼠随机分为CON组、心肌病理性重构组(AAC组)、MA+AAC组和MH+AAC组,每组10只。对AAC组、MA+AAC组和MH+AAC组大鼠进行AAC手术,CON组进行假手术。术后4周超声检测心脏结构和功能;病理染色观察比目鱼肌、腓肠肌和心肌形态学改变;ELISA法检测血清肌生成抑制蛋白(MSTN)浓度;realtime PCR检测心肌组织心房钠尿肽(ANP)和脑钠肽(BNP),以及骨骼肌和心肌组织MSTN的mRNA表达水平。结果:4周的去神经术或负重跑训练后,与CON组相比,MA组大鼠腓肠肌和比目鱼肌显著萎缩,MH组大鼠腓肠肌和比目鱼肌显著肥大,但两组心重/体重、左室舒张末期心室壁厚度、射血分数等相关指标均无显著差异(P>0.05)。与AAC组相比,MA+AAC组大鼠心重/体重和左室舒张末期心室壁厚度显著增大,舒张末期内径显著降低,射血分数显著上升(P<0.05或P<0.01),心肌纤维化加重;MH+AAC组心重/体重和左室舒张末期心室壁厚度显著降低,舒张末期内径显著增加,射血分数显著降低(P<0.05或P<0.01),心肌纤维化减轻。与AAC组相比,MA+AAC组心肌ANP和BNP的mRNA表达水平显著上升,MH+AAC组ANP和BNP的mRNA表达水平显著下降(P<0.01)。与AAC组相比,MA+AAC组比目鱼肌、腓肠肌和心肌MSTN的mRNA表达水平,以及血清MSTN含量均显著上升(P<0.01);MH+AAC组腓肠肌和心肌MSTN的mRNA表达水平,以及血清MSTN含量均显著下降(P<0.05)。结论:萎缩的骨骼肌加重AAC手术诱导的心脏病理性重构,而肥大的骨骼肌使AAC诱导的病理性重构减轻。骨骼肌质量对心脏病理性重构有着重要影响�AIM:To investigate the effects of skeletal muscle mass on cardiac structure and function in rats subjected to abdominal aortic constriction(AAC),and to explore its potential mechanisms.METHODS:(1)Thirty male SD rats were randomly divided into 3 groups:control(CON)group(n=10),muscular atrophy(MA)group(n=10),and muscular hypertrophy(MH)group(n=10).The rats in MA group underwent bilateral tibial nerve removal to induce MA,while those in MH group engaged in weight-bearing running to promote MH.Four weeks later,skeletal muscle samples were collected,and indicators of MA and MH were assessed.(2)Another rats after modeling above were divided into 4 groups:CON group(n=10),cardiac pathological remodeling group(AAC group;n=10),MA+AAC group(n=10),and MH+AAC group(n=10).All rats,except those in CON group which underwent a sham operation,received AAC surgery.Four weeks after surgery,cardiac structure and function were assessed by echocardiography,while morphological changes of the soleus and gastrocnemius muscles and myocardium were evaluated by pathological staining.Serum myostatin(MSTN)level was measured using ELISA.The mRNA expression levels of atrial natriuretic peptide(ANP)and brain natriuretic peptide(BNP)in the myocardium,and MSTN in the skeletal muscle and myocardium were detected by real-time PCR.RESULTS:After 4 weeks of either denervation or weight-bearing running,significant atrophy and hypertrophy of the gastrocnemius and soleus muscles were observed in MA and MH groups,respectively,compared with CON group.However,no significant differences were noted in heart weight/body weight ratio,left ventricular end-diastolic wall thickness,ejection fraction,or other related indexes among these groups(P>0.05).In comparison to AAC group,the rats in MA+AAC group showed a significant increase in heart weight/body weight ratio and left ventricular end-diastolic anterior wall thickness,a decrease in end-diastolic internal diameter,an increase in ejection fraction(P<0.05 or P<0.01),and exacerbated myocardial fibrosis.Conversely,in

关 键 词：心血管疾病 骨骼肌 肌萎缩 肌肥大 腹主动脉缩窄 肌生成抑制蛋白 

分 类 号：R685[医药卫生—骨科学] R541[医药卫生—外科学] R363.2[医药卫生—临床医学]