体育科学
體育科學
체육과학
China Sport Science
2015年
11期
30-37,44
,共9页
王世强%常芸%马晓雯%饶志坚
王世彊%常蕓%馬曉雯%饒誌堅
왕세강%상예%마효문%요지견
运动%鼠%心房纤维化%羟脯氨酸%转化生长因子%microRNA-21
運動%鼠%心房纖維化%羥脯氨痠%轉化生長因子%microRNA-21
운동%서%심방섬유화%간포안산%전화생장인자%microRNA-21
exercise%rat%artrial f ibrosis%hydroxyproline%TGF-β1%microRNA-21
目的:通过建立长期大强度运动动物模型,研究不同强度耐力运动对大鼠心房羟脯氨酸含量的影响以及 TGF‐β1/miR‐21信号途径的调节作用,为运动性心房纤颤的发生机制提供实验依据。方法:72只健康成年雄性 SD大鼠随机分为安静组、中等强度组和大强度组,每组24只。分别进行8周、12周和16周运动,每周训练5天,休息2天,每次运动1 h。运动8周、12周和16周后24 h内处死取材摘取心脏,分离出右心房。采用酶联免疫法检测血清cTnI 的含量;样本碱水解法检测羟脯氨酸的含量;荧光定量 PCR检测 TGF‐β1和 miR‐21的含量。Western Blot检测 TGF‐β1蛋白表达。结果:大强度组8周、12周和16周大鼠血清cTnI 的含量均显著高于安静组和中等强度组( P<0.01),中等强度组8周、12周和16周大鼠cTnI 的含量均无显著变化。8周运动后,各组之间羟脯氨酸的含量无明显差异;12周和16周大强度组羟脯氨酸的含量显著高于各自的安静组和中等强度组( P<0.01),中等强度组和安静组之间没有显著性差异。随着运动时间延长,大强度组羟脯氨酸的含量有逐渐增加趋势,16周羟脯氨酸的含量显著高于8周大强度组( P<0.05)。8周、12周和16周大强度组 TGF‐β1基因和蛋白的表达均显著高于各自安静组,而中等强度组和安静组之间TGF‐β1的表达无明显差异。随着运动时间延长,大强度组 TGF‐β1的含量有逐渐降低的趋势。8周、12周和16周运动后,与各自安静组相比,大强度组 miR‐21的表达均显著性增加( P<0.05),随着运动时间延长,大强度组 miR‐21的含量有逐渐降低的趋势,16周大强度组miR‐21的表达显著低于8周大强度组( P<0.05),中等强度组和安静组之间 miR‐21的表达无明显差异。结论:长期大强度运动导致大鼠心肌损伤长期存在,并伴随大鼠心房胶原蛋白的持续增加,诱发了心房纤维化,构成了运动性心房纤颤的病理基础。长期大强度运动通过上调大鼠心房 TGF‐β1/miR‐21信号通路,可能介导了运动性心房损伤纤维化的发生。
目的:通過建立長期大彊度運動動物模型,研究不同彊度耐力運動對大鼠心房羥脯氨痠含量的影響以及 TGF‐β1/miR‐21信號途徑的調節作用,為運動性心房纖顫的髮生機製提供實驗依據。方法:72隻健康成年雄性 SD大鼠隨機分為安靜組、中等彊度組和大彊度組,每組24隻。分彆進行8週、12週和16週運動,每週訓練5天,休息2天,每次運動1 h。運動8週、12週和16週後24 h內處死取材摘取心髒,分離齣右心房。採用酶聯免疫法檢測血清cTnI 的含量;樣本堿水解法檢測羥脯氨痠的含量;熒光定量 PCR檢測 TGF‐β1和 miR‐21的含量。Western Blot檢測 TGF‐β1蛋白錶達。結果:大彊度組8週、12週和16週大鼠血清cTnI 的含量均顯著高于安靜組和中等彊度組( P<0.01),中等彊度組8週、12週和16週大鼠cTnI 的含量均無顯著變化。8週運動後,各組之間羥脯氨痠的含量無明顯差異;12週和16週大彊度組羥脯氨痠的含量顯著高于各自的安靜組和中等彊度組( P<0.01),中等彊度組和安靜組之間沒有顯著性差異。隨著運動時間延長,大彊度組羥脯氨痠的含量有逐漸增加趨勢,16週羥脯氨痠的含量顯著高于8週大彊度組( P<0.05)。8週、12週和16週大彊度組 TGF‐β1基因和蛋白的錶達均顯著高于各自安靜組,而中等彊度組和安靜組之間TGF‐β1的錶達無明顯差異。隨著運動時間延長,大彊度組 TGF‐β1的含量有逐漸降低的趨勢。8週、12週和16週運動後,與各自安靜組相比,大彊度組 miR‐21的錶達均顯著性增加( P<0.05),隨著運動時間延長,大彊度組 miR‐21的含量有逐漸降低的趨勢,16週大彊度組miR‐21的錶達顯著低于8週大彊度組( P<0.05),中等彊度組和安靜組之間 miR‐21的錶達無明顯差異。結論:長期大彊度運動導緻大鼠心肌損傷長期存在,併伴隨大鼠心房膠原蛋白的持續增加,誘髮瞭心房纖維化,構成瞭運動性心房纖顫的病理基礎。長期大彊度運動通過上調大鼠心房 TGF‐β1/miR‐21信號通路,可能介導瞭運動性心房損傷纖維化的髮生。
목적:통과건립장기대강도운동동물모형,연구불동강도내력운동대대서심방간포안산함량적영향이급 TGF‐β1/miR‐21신호도경적조절작용,위운동성심방섬전적발생궤제제공실험의거。방법:72지건강성년웅성 SD대서수궤분위안정조、중등강도조화대강도조,매조24지。분별진행8주、12주화16주운동,매주훈련5천,휴식2천,매차운동1 h。운동8주、12주화16주후24 h내처사취재적취심장,분리출우심방。채용매련면역법검측혈청cTnI 적함량;양본감수해법검측간포안산적함량;형광정량 PCR검측 TGF‐β1화 miR‐21적함량。Western Blot검측 TGF‐β1단백표체。결과:대강도조8주、12주화16주대서혈청cTnI 적함량균현저고우안정조화중등강도조( P<0.01),중등강도조8주、12주화16주대서cTnI 적함량균무현저변화。8주운동후,각조지간간포안산적함량무명현차이;12주화16주대강도조간포안산적함량현저고우각자적안정조화중등강도조( P<0.01),중등강도조화안정조지간몰유현저성차이。수착운동시간연장,대강도조간포안산적함량유축점증가추세,16주간포안산적함량현저고우8주대강도조( P<0.05)。8주、12주화16주대강도조 TGF‐β1기인화단백적표체균현저고우각자안정조,이중등강도조화안정조지간TGF‐β1적표체무명현차이。수착운동시간연장,대강도조 TGF‐β1적함량유축점강저적추세。8주、12주화16주운동후,여각자안정조상비,대강도조 miR‐21적표체균현저성증가( P<0.05),수착운동시간연장,대강도조 miR‐21적함량유축점강저적추세,16주대강도조miR‐21적표체현저저우8주대강도조( P<0.05),중등강도조화안정조지간 miR‐21적표체무명현차이。결론:장기대강도운동도치대서심기손상장기존재,병반수대서심방효원단백적지속증가,유발료심방섬유화,구성료운동성심방섬전적병리기출。장기대강도운동통과상조대서심방 TGF‐β1/miR‐21신호통로,가능개도료운동성심방손상섬유화적발생。
Objective :To explore effects of different sustained intensive exercise on rat atrial hydroxyproline ,and role of TGF‐β1/miR‐21 signaling pathway through establishing long‐term exercise animal model ,and provide experimental evidence for clarifiying the mechanism of exer‐cise‐induced atrial fibrillation .Methods :72 SD rats were divided into control group (C) ,mod‐erate intensity group (M ) and high instensity group (H ) with 24 animals in each group .M and H group were conditioned to run for 4 ,8 ,and 16 weeks ,5 days/weeks ,1h/day .Rats were euthanized to obtain hearts within 24h after exercise .Right atrial were collected .cTnI was quantified by Elisa ,hydroxyproline was measured by lkali hydrolysis methodwhich .TGF‐β1 and miR‐21 gene expression were evaluted by real‐time PCR .TGF‐β1 protein was quanti‐fied by Western Blot .Results :Compared with control and M group ,rats serum cTnI increased at 8 weeks/12 weeks/16 weeks ( P< 0 .01 ) .While there was no significance between M group and C gourp .There was no significant difference in hydroxyproline at 8 weeks .Com‐pared with C and M group ,hydroxyproline content of H group showed significant increase at 12 weeks and 16 weeks ( P< 0 .01 ) .No difference was oberserved between C group and M group .Hydroxyproline content of H group confirmed a gradual increase with training time , with significant increase from 8 weeks to 16weeks (P<0 .05) .TGF‐β1 gene and protein ex‐pression of H group increased compared their control group at 8/12/16 weeks .But no differ‐ence was observed between C and M group .TGF‐β1 expression had a gradual decrease from 8 to 16 weeks .Compared with their control group ,miR‐21 expressio of H group showed a sig‐nificant increase ( P<0 .05 ) .miR‐21 of H group confirmed a gradual decrease with training time ,with significant decrease from 8 weeks to 16weeks (P<0 .05) .No significant difference was observed beteen C and M group .Conclusion :Long‐term intensive exercise induced sus‐tained myocardial damage ,resulted in sustained collagen increase w hich induced myocardial fi‐brosis .This may be a substrate for exercise‐induced atrial fibrillation .TGF‐β1/miR‐21 signa‐ling pathway ,upregulated by long‐term intensive exercise ,may involve in the pathology of in‐tense exercise‐induced myocardial damage and atrial fibrillation .