- 相關(guān)推薦
白藜蘆醇對豚鼠心室肌細(xì)胞L
作者:易方方,唐其柱,馮斯婷,王騰【關(guān)鍵詞】 白藜蘆醇;全細(xì)胞膜片鉗;鈣電流
Effects of resveratrol on Ltype calcium current in isolated ventricular myocytes of guinea pig
【Abstract】 AIM: To investigate the effects of resveratrol on the Ltype calcium current (ICaL) in isolated ventricular myocytes of guinea pig. METHODS: Single ventricular cell was obtained from healthy guinea pig heart using enzymatic dissociation methods. The wholecell patch clamp was used to record the ICaL following the administration of resveratrol at 1, 50, 100 μmol/L. RESULTS: ① Resveratrol reduced the ICaL in a concentrationdependent manner, but it had no effect on IV shape of ICaL. ② Resveratrol markedly shifted the steadystate activation curve of ICaL to the right, and V1/2 value increased from (-18.97±4.08) mV in control to (-15.97±4.13) mV in the presence of resveratrol (n=7, P=0.02), the κ value from (3.64±0.56) to (3.82±0.60) (n=7,P=0.67). ③ Inactivation curve of ICaL was not affected significantly. ④ The time constant of reactivation of ICaL was reduced from (98.50±9.00) ms to (54.53±4.27) ms (n=6,P=0.000) by resveratrol. CONCLUSION: Resveratrol inhibited the Ltype calcium channel, mainly acting on the activity and recovery processes.
【Keywords】 resveratrol;wholecell patch clamp;calcium current
【摘要】 目的:研究白藜蘆醇對正常豚鼠心室肌細(xì)胞L型鈣電流(ICaL)的影響. 方法:采用全細(xì)胞膜片鉗技術(shù),記錄不同濃度白藜蘆醇作用前后對ICaL的影響. 結(jié)果:①白藜蘆醇呈濃度依賴性阻斷ICaL,但對激活電位、峰電位、反轉(zhuǎn)電位均沒有影響;②白藜蘆醇使ICaL穩(wěn)態(tài)激活曲線右移,V1/2由對照的(-18.97±4.08) mV變?yōu)椋?15.97±4.13) mV (n=7,P=0.02),κ由(3.64±0.56)變?yōu)椋?.82±0.60)(n=7,P=0.67);③對失活曲線無影響,不改變ICaL失活特性;④白藜蘆醇使ICaL失活后再恢復(fù)時(shí)間常數(shù)τ縮短,從(98.50±9.00) ms變?yōu)椋?4.53±4.27) ms(n=6,P=0.000). 結(jié)論:白藜蘆醇對ICaL有阻斷作用,主要作用于鈣通道激活和恢復(fù)過程.
【關(guān)鍵詞】 白藜蘆醇;全細(xì)胞膜片鉗;鈣電流
0引言
白藜蘆醇化學(xué)名為3,5,4′三羥基反二苯代乙烯(3,5,4′ trihydroxyrans stilbene),是一種主要存在于葡萄皮、花生中的多酚類植物抗毒素. 現(xiàn)認(rèn)為它是適量飲用葡萄酒有利于心血管健康的主要作用因子[1]. 大量研究[2-3]發(fā)現(xiàn)白藜蘆醇對心肌缺血-再灌注損傷有保護(hù)作用;對血管有廣泛的舒張效應(yīng)[4];能抗動脈粥樣硬化,防治冠心病[5]. 但其對心肌細(xì)胞離子通道的作用少見報(bào)道,我們采用膜片鉗技術(shù)研究白藜蘆醇對心室肌細(xì)胞ICaL的影響.
1材料和方法
1.1材料健康成年豚鼠31只(武漢大學(xué)醫(yī)學(xué)院動物中心),體質(zhì)量250~350 g,雌雄不拘; I型膠原酶,蛋白酶E,HEPES(Gibco公司); CSOH, CSCl, Na2ATP(Sigma公司);白藜蘆醇(西安賽得高科生物股份有限公司);其余均為國產(chǎn)分析純. 無鈣臺氏液 (mmol/L):NaCl 135,KCl 5.4,MgCl2 1,NaH2PO4 0.33,Glucose 20,HEPES 10,pH 7.38 (NaOH調(diào)節(jié));KB液(mmol/L): glumatic acid 50,KOH 85,KCl 30,MgSO4 3,Taurine 20,Glucose 10,HEPES 10,EGTA 0.5,pH 7.2(KOH調(diào)節(jié));電極外液組成(mmol/L):NaCl 37,Choline Chloride 100,CaCl2 1.8,MgCl2 0.5, HEPES 10,Glucose 10,CSCl 4.6,pH 7.3(CSOH調(diào)節(jié));電極內(nèi)液組成(mmol/L): CSCl 120, CaCl2 1.0, MgCl2 5, Na2ATP 5,EGTA 11, HEPES 10,Glucose 11,pH 7.4(CSOH調(diào)
【白藜蘆醇對豚鼠心室肌細(xì)胞L】相關(guān)文章:
微電極陣記錄技術(shù)對多非利特干預(yù)豚鼠心室肌電生理特性的應(yīng)用研究03-08
成年兔心耳肌細(xì)胞的分離標(biāo)記與自體移植03-18
紫杉醇納米粒的研究進(jìn)展11-17
正交試驗(yàn)法優(yōu)選金芍膠囊的醇提工藝03-26