中国病理生理杂志
中國病理生理雜誌
중국병리생리잡지
CHINESE JOURNAL OF PATHOPHYSIOLOGY
2014年
8期
1489-1492
,共4页
胥亚楠%杨龙%杨天和%邓春玉%罗淋%覃智芳%唐倩%杨君
胥亞楠%楊龍%楊天和%鄧春玉%囉淋%覃智芳%唐倩%楊君
서아남%양룡%양천화%산춘옥%라림%담지방%당천%양군
牵张%心房肌细胞%膜片钳技术%钾电流%动作电位
牽張%心房肌細胞%膜片鉗技術%鉀電流%動作電位
견장%심방기세포%막편겸기술%갑전류%동작전위
Stretch%Atrial myocytes%Patch-clamp techniques%Potassium current%Action potential
目的:探究牵张刺激对乳鼠心房肌细胞瞬时外向钾电流(Ito)、内向整流钾电流(IK1)和动作电位时程( APD)的影响。方法:取1日龄SD乳大鼠心脏,分离、消化获得心房肌细胞。于细胞牵引装置培养24 h分组:对照组不予牵张刺激;牵张组予增加12%硅胶膜面积牵张刺激24 h。膜片钳全细胞记录方法记录细胞膜Ito、IK1和APD的变化。结果:在+60 mV刺激电压水平,牵张组Ito密度与对照组相比明显降低[(1.6±0.4)pA/pF vs (12.1±2.9) pA/pF,P<0.01]。在-120 mV刺激电压下,牵张组IK1密度较对照组增大[(-10.8±0.8) pA/pF vs (-8.8±0.9) pA/pF,P<0.01]。牵张组动作电位复极50%( APD50)和复极90%( APD90)均较对照组明显缩短[(10.5±1.4)ms vs (15.5±2.4) ms,(30.0±2.8) ms vs (56.3±3.6) ms,P<0.01]。结论:牵张刺激可降低乳大鼠心房肌细胞Ito密度,增大IK1密度,缩短APD,这可能是压力负荷增大致心房电重构的基础之一。
目的:探究牽張刺激對乳鼠心房肌細胞瞬時外嚮鉀電流(Ito)、內嚮整流鉀電流(IK1)和動作電位時程( APD)的影響。方法:取1日齡SD乳大鼠心髒,分離、消化穫得心房肌細胞。于細胞牽引裝置培養24 h分組:對照組不予牽張刺激;牽張組予增加12%硅膠膜麵積牽張刺激24 h。膜片鉗全細胞記錄方法記錄細胞膜Ito、IK1和APD的變化。結果:在+60 mV刺激電壓水平,牽張組Ito密度與對照組相比明顯降低[(1.6±0.4)pA/pF vs (12.1±2.9) pA/pF,P<0.01]。在-120 mV刺激電壓下,牽張組IK1密度較對照組增大[(-10.8±0.8) pA/pF vs (-8.8±0.9) pA/pF,P<0.01]。牽張組動作電位複極50%( APD50)和複極90%( APD90)均較對照組明顯縮短[(10.5±1.4)ms vs (15.5±2.4) ms,(30.0±2.8) ms vs (56.3±3.6) ms,P<0.01]。結論:牽張刺激可降低乳大鼠心房肌細胞Ito密度,增大IK1密度,縮短APD,這可能是壓力負荷增大緻心房電重構的基礎之一。
목적:탐구견장자격대유서심방기세포순시외향갑전류(Ito)、내향정류갑전류(IK1)화동작전위시정( APD)적영향。방법:취1일령SD유대서심장,분리、소화획득심방기세포。우세포견인장치배양24 h분조:대조조불여견장자격;견장조여증가12%규효막면적견장자격24 h。막편겸전세포기록방법기록세포막Ito、IK1화APD적변화。결과:재+60 mV자격전압수평,견장조Ito밀도여대조조상비명현강저[(1.6±0.4)pA/pF vs (12.1±2.9) pA/pF,P<0.01]。재-120 mV자격전압하,견장조IK1밀도교대조조증대[(-10.8±0.8) pA/pF vs (-8.8±0.9) pA/pF,P<0.01]。견장조동작전위복겁50%( APD50)화복겁90%( APD90)균교대조조명현축단[(10.5±1.4)ms vs (15.5±2.4) ms,(30.0±2.8) ms vs (56.3±3.6) ms,P<0.01]。결론:견장자격가강저유대서심방기세포Ito밀도,증대IK1밀도,축단APD,저가능시압력부하증대치심방전중구적기출지일。
[ABSTRACT]AIM:Toinvestigatetheeffectsofmechanicalstretchontransientoutwardpotassiumcurrent(Ito), inward rectifier potassium current ( IK1 ) and action potential duration ( APD) of cultured neonatal rat atrial myocytes . METHODS:Neonatal rat atrial myocytes were isolated and cultured on silicone sheeting with or without stretch for 24 h. The silicone membrane area was increased by 12%in stretched group.The cells without stretch served as control .Ito, IK1 and APD were recorded by the technique of whole-cell patch clamp.RESULTS:Compared with control group, Ito density in stretched myocytes was significantly reduced [(1.6 ±0.4) pA/pF vs (12.1 ±2.9) pA/pF, P<0.01], whereas IK1 density was increased [(-10.8 ±0.8) pA/pF vs (-8.8 ±0.9) pA/pF, P<0.01].The APDs at 50%and 90%levels of repolarization ( APD50 and APD90 ) in the stretched cells were obviously decreased than those in non-stretched cells [(10.5 ±1.4) ms vs (15.5 ±2.4) ms, (30.0 ±2.8) ms vs (56.3 ±3.6) ms, P<0.01].CONCLUSION: Stretch stimulation leads to the reduction of Ito density, the increase in IK1 density and the shortness of APD in cultured rat atrial neonatal myocytes , which may contribute to atrial electrical remodeling induced by pressure overload .