中华心脏与心律电子杂志
中華心髒與心律電子雜誌
중화심장여심률전자잡지
2014年
1期
41-44
,共4页
王芳%李洪仕%万征%边波%滕天明%赵青
王芳%李洪仕%萬徵%邊波%滕天明%趙青
왕방%리홍사%만정%변파%등천명%조청
阿托伐他汀%钠电流%缺血再灌注
阿託伐他汀%鈉電流%缺血再灌註
아탁벌타정%납전류%결혈재관주
Atorvastatin%Sodium current%Ischemia-reperfusion
目的:观察阿托伐他汀对大鼠缺血再灌注左室心肌细胞瞬时钠电流( INa )的作用。方法 Wistar大鼠24只,酶解分离存活有效左室心肌细胞23个,随机分为3组,对照组,即单纯细胞缺血模型(再灌注缺血电极外液,n=8),再灌注组(再灌注标准电极外液,n=7)和他汀干预组(再灌注含阿托伐他汀5μmol/L的电极外液,n=8)。3组细胞均置于标准电极外液中记录正常基线INa ,此后灌流缺血电极外液,以测定缺血基线INa(缺血20 min),再行再灌注与干预实验。采用全细胞膜片钳记录INa,计算I/Imax作为标准化INa。比较3组的标准化INa(电位-40 mV)、半激活电压(V1/2)和激活曲线斜率(k值),采用SPSS 20.0软件统计分析,使用重复测量资料的方差分析。结果(1)正常基线INa ,3组间差异无统计学意义。与正常基线INa相比,在缺血20 min时,3组细胞标准化INa、V1/2和k值均减小(t=2.861、9.462、6.264,均P<0.01),但3组间比较差异无统计学意义。(2)再灌注3 min时,再灌注组INa(0.83±0.11比0.57±0.09, P<0.01),他汀干预组INa(0.92±0.04比0.72±0.05, P<0.01)均比缺血基线INa降低,对照组无变化。再灌注组和他汀干预组INa均低于对照组,而他汀干预组高于再灌注组(F=23.738, P<0.05)。(3)再灌注3 min时,对照组V1/2和k值和缺血基线比较无差异,再灌注组均增大[V1/2(-58.87±3.36) mV 比(-54.33±2.40) mV,k值(1.25±0.59)比(1.91±0.84), t =-3.179、-2.904,均 P <0.05〗,他汀干预组, V1/2增大[(-57.80±2.97) mV比(-52.76±3.14) mV,t =-5.706, P<0.01],k值无变化(P>0.05)。结论大鼠左室心肌细胞INa在缺血时降低,再灌注时继续降低;阿托伐他汀可部分抑制再灌注引起的INa减小,并使INa的激活加快。
目的:觀察阿託伐他汀對大鼠缺血再灌註左室心肌細胞瞬時鈉電流( INa )的作用。方法 Wistar大鼠24隻,酶解分離存活有效左室心肌細胞23箇,隨機分為3組,對照組,即單純細胞缺血模型(再灌註缺血電極外液,n=8),再灌註組(再灌註標準電極外液,n=7)和他汀榦預組(再灌註含阿託伐他汀5μmol/L的電極外液,n=8)。3組細胞均置于標準電極外液中記錄正常基線INa ,此後灌流缺血電極外液,以測定缺血基線INa(缺血20 min),再行再灌註與榦預實驗。採用全細胞膜片鉗記錄INa,計算I/Imax作為標準化INa。比較3組的標準化INa(電位-40 mV)、半激活電壓(V1/2)和激活麯線斜率(k值),採用SPSS 20.0軟件統計分析,使用重複測量資料的方差分析。結果(1)正常基線INa ,3組間差異無統計學意義。與正常基線INa相比,在缺血20 min時,3組細胞標準化INa、V1/2和k值均減小(t=2.861、9.462、6.264,均P<0.01),但3組間比較差異無統計學意義。(2)再灌註3 min時,再灌註組INa(0.83±0.11比0.57±0.09, P<0.01),他汀榦預組INa(0.92±0.04比0.72±0.05, P<0.01)均比缺血基線INa降低,對照組無變化。再灌註組和他汀榦預組INa均低于對照組,而他汀榦預組高于再灌註組(F=23.738, P<0.05)。(3)再灌註3 min時,對照組V1/2和k值和缺血基線比較無差異,再灌註組均增大[V1/2(-58.87±3.36) mV 比(-54.33±2.40) mV,k值(1.25±0.59)比(1.91±0.84), t =-3.179、-2.904,均 P <0.05〗,他汀榦預組, V1/2增大[(-57.80±2.97) mV比(-52.76±3.14) mV,t =-5.706, P<0.01],k值無變化(P>0.05)。結論大鼠左室心肌細胞INa在缺血時降低,再灌註時繼續降低;阿託伐他汀可部分抑製再灌註引起的INa減小,併使INa的激活加快。
목적:관찰아탁벌타정대대서결혈재관주좌실심기세포순시납전류( INa )적작용。방법 Wistar대서24지,매해분리존활유효좌실심기세포23개,수궤분위3조,대조조,즉단순세포결혈모형(재관주결혈전겁외액,n=8),재관주조(재관주표준전겁외액,n=7)화타정간예조(재관주함아탁벌타정5μmol/L적전겁외액,n=8)。3조세포균치우표준전겁외액중기록정상기선INa ,차후관류결혈전겁외액,이측정결혈기선INa(결혈20 min),재행재관주여간예실험。채용전세포막편겸기록INa,계산I/Imax작위표준화INa。비교3조적표준화INa(전위-40 mV)、반격활전압(V1/2)화격활곡선사솔(k치),채용SPSS 20.0연건통계분석,사용중복측량자료적방차분석。결과(1)정상기선INa ,3조간차이무통계학의의。여정상기선INa상비,재결혈20 min시,3조세포표준화INa、V1/2화k치균감소(t=2.861、9.462、6.264,균P<0.01),단3조간비교차이무통계학의의。(2)재관주3 min시,재관주조INa(0.83±0.11비0.57±0.09, P<0.01),타정간예조INa(0.92±0.04비0.72±0.05, P<0.01)균비결혈기선INa강저,대조조무변화。재관주조화타정간예조INa균저우대조조,이타정간예조고우재관주조(F=23.738, P<0.05)。(3)재관주3 min시,대조조V1/2화k치화결혈기선비교무차이,재관주조균증대[V1/2(-58.87±3.36) mV 비(-54.33±2.40) mV,k치(1.25±0.59)비(1.91±0.84), t =-3.179、-2.904,균 P <0.05〗,타정간예조, V1/2증대[(-57.80±2.97) mV비(-52.76±3.14) mV,t =-5.706, P<0.01],k치무변화(P>0.05)。결론대서좌실심기세포INa재결혈시강저,재관주시계속강저;아탁벌타정가부분억제재관주인기적INa감소,병사INa적격활가쾌。
Objective To observe the effects of atorvastatin on transient sodium currents ( INa ) on ventricular myocytes during ischemia-reperfusion .Methods Twenty-four Wistar rats were used , and the twenty-three effective left ventricular myocytes were successfully isolated , which were randomly divided into 3 groups:control group which was reperfused with ischemia extracellular fluid ( n=8 ) , ischemia-reperfusion group which was reperfused with standard extracellular fluid ( n=7 ) and statin group which was reperfused with standard extracellular fluid containing 5 μmol/L atorvastatin(n=8).All cells of 3 groups were put in hypoxic and acidic extracellular fluid , standing for 20 min to establish ischemia model .Then, the cells of 3 groups were underwent ischemia-reperfusion or statin experiment .INa was recorded by whole-cell patch clamp, and I/Imax ( normalized I Na at -40 mV ) , V1/2 and k were calculated and compared among 3 groups.Results (1) Normal basic levels were no difference among 3 groups.Basic ischemia level of 3 groups:after ischemia for 20 min, compared with normal state , normalized I Na , V1/2 and k decreased ( t=2.861, 9.462, 6.264, all P<0.01), and there were no differences among the 3 groups.(2) Compared with ischemia for 20 min, ischemia-reperfusion group I Na of reperfusion for 3 min were decreased from 0.83 ±0.11 vs 0.57 ±0.09 (P<0.01).In statin group INa were decreased from 0.92 ±0.04 vs 0.72 ± 0.05(P<0.01), but there were no change in control group .Compared with control group , the currents of ischemia-reperfusion and statin group were decreased , while statin group were increased compared with ischemia-reperfusion group (F =23.738, P<0.05).(3) Activation parameters in reperfusion phase:compared with ischemia baseline, at the first 3 min of reperfusion, V1/2 and k in control group were not changed, while they both increased in ischemia-reperfusion group (V1/2: -58.87 ±3.36 mV vs -54.33 ± 2.40 mV, k 1.25 ±0.59 vs 1.91 ±0.84, t=-3.179、 -2.904, all P<0.05), and in statin group, only V1/2 increased ( -57.80 ±2.97 mV vs -52.76 ±3.14 mV, t=-5.706, P<0.01).Conclusion INa of rat ventricular myocytes decrease during ischemia , and decrease more during reperfusion .Atorvastatin can partly reverse the injured I Na during early reperfusion , and accelerate the activation of I Na .