中华生物医学工程杂志
中華生物醫學工程雜誌
중화생물의학공정잡지
CHINESE JOURNAL OF BIOMEDICAL ENGINEERING
2013年
6期
448-452
,共5页
朱房勇%陈玉华%梁婧%尹康%邹建明%高宇峰%凌厉%许艳华
硃房勇%陳玉華%樑婧%尹康%鄒建明%高宇峰%凌厲%許豔華
주방용%진옥화%량청%윤강%추건명%고우봉%릉려%허염화
静磁场%Na+通道%膜片钳技术%成肌细胞
靜磁場%Na+通道%膜片鉗技術%成肌細胞
정자장%Na+통도%막편겸기술%성기세포
Static magnetic field%Na+ channel%patch clamp technique%skeletal myoblast
目的 研究磁场对成肌细胞Na+通道特性的影响.方法 实验分为空白对照和280 mT磁场作用组,将成肌细胞暴露于由磁铁产生的280 mT恒定磁场强度中,每组分别于12、36、60h后,应用全细胞膜片钳技术记录成肌细胞钠电流的激活、失活以及恢复曲线.结果 空白对照组中,Na+通道开放的数目并不会随细胞培养时间的增加而发生改变.280 mT磁场作用组中,作用36 h,60h后峰电流密度值与其他组差异有统计学意义(n=10,P<0.05),280 mT 36 h组的半数最大激活电压为-25.39±0.37 mV、半数最大失活电压数值为-64.88±2.38 mV(n=10,P<0.05),280 mT 36 h,60 h失活后恢复时间常数减少,分别为8.49±0.16 ms和8.98±0.25ms(n=10,P<0.05).结论 磁场未改变Na+内向电流具有快速激活和快速失活的特性.磁场作用下,Na+通道开放的数目随时间的增加而增加,稳态激活曲线右移,Na+通道难激活,但通道激活的速率没有改变.失活电压(绝对值)减小,通道不容易失活.通道从失活到恢复的过程加快.从动力学角度看,随着加磁时间的增加,磁场作用促进Na+内流,Na+开放和关闭的形式发生了改变.
目的 研究磁場對成肌細胞Na+通道特性的影響.方法 實驗分為空白對照和280 mT磁場作用組,將成肌細胞暴露于由磁鐵產生的280 mT恆定磁場彊度中,每組分彆于12、36、60h後,應用全細胞膜片鉗技術記錄成肌細胞鈉電流的激活、失活以及恢複麯線.結果 空白對照組中,Na+通道開放的數目併不會隨細胞培養時間的增加而髮生改變.280 mT磁場作用組中,作用36 h,60h後峰電流密度值與其他組差異有統計學意義(n=10,P<0.05),280 mT 36 h組的半數最大激活電壓為-25.39±0.37 mV、半數最大失活電壓數值為-64.88±2.38 mV(n=10,P<0.05),280 mT 36 h,60 h失活後恢複時間常數減少,分彆為8.49±0.16 ms和8.98±0.25ms(n=10,P<0.05).結論 磁場未改變Na+內嚮電流具有快速激活和快速失活的特性.磁場作用下,Na+通道開放的數目隨時間的增加而增加,穩態激活麯線右移,Na+通道難激活,但通道激活的速率沒有改變.失活電壓(絕對值)減小,通道不容易失活.通道從失活到恢複的過程加快.從動力學角度看,隨著加磁時間的增加,磁場作用促進Na+內流,Na+開放和關閉的形式髮生瞭改變.
목적 연구자장대성기세포Na+통도특성적영향.방법 실험분위공백대조화280 mT자장작용조,장성기세포폭로우유자철산생적280 mT항정자장강도중,매조분별우12、36、60h후,응용전세포막편겸기술기록성기세포납전류적격활、실활이급회복곡선.결과 공백대조조중,Na+통도개방적수목병불회수세포배양시간적증가이발생개변.280 mT자장작용조중,작용36 h,60h후봉전류밀도치여기타조차이유통계학의의(n=10,P<0.05),280 mT 36 h조적반수최대격활전압위-25.39±0.37 mV、반수최대실활전압수치위-64.88±2.38 mV(n=10,P<0.05),280 mT 36 h,60 h실활후회복시간상수감소,분별위8.49±0.16 ms화8.98±0.25ms(n=10,P<0.05).결론 자장미개변Na+내향전류구유쾌속격활화쾌속실활적특성.자장작용하,Na+통도개방적수목수시간적증가이증가,은태격활곡선우이,Na+통도난격활,단통도격활적속솔몰유개변.실활전압(절대치)감소,통도불용역실활.통도종실활도회복적과정가쾌.종동역학각도간,수착가자시간적증가,자장작용촉진Na+내류,Na+개방화관폐적형식발생료개변.
Objective To examine the effects of 280 mT static magnetic field on sodium ion (Na+) channel characteristics in skeletal myoblasts by using the whole-cell patch-clamp technique.Methods The cultured skeletal muscle cells were exposed to the 280mT static magnetic field for 12,36 and 60 hours,respectively,for the assessment of activation,inactivation and recovery curve of Na + current by using the whole-cell patch-clamp technique.Results The number of open channel in the blank control group did not increase with time.In treatment group (exposed to 280 mT magnetic field),the peak current density was significantly different at hours 36 and 60 (n=10,P<0.05).The half-maximum activated voltage of treatment group was (-25.39±0.37) mV and the half-maximum inactivation voltage (-64.88±2.38) mV (n=10,both P< 0.05) at hour 36.In addition,the treatment group was associated with a shortened time of recovery at hours 36 and 60 [(8.49±0.16) ms and (8.98±0.25) ms,both P<0.05].Conclusions The static magnetic field does not alter the characteristics of rapid activation and deactivation of Na+ inward current.There is a trend towards an increased number of Na + open channels with time when exposed to the static magnetic field,which results in a right-shift of the activation curve,suggesting the difficulty in channel activation with an unaltered velocity.The diminished absolute of inactivation voltage indicats a reduced likelihood of activation,which is accompanied by accelerated recovery from inactivated state.The static magnetic field kinetically facilitates the inward flow of Na+ and leads to the opening and closure characteristics of Na+ channel as the time advances.