中国药理学通报
中國藥理學通報
중국약이학통보
CHINESE PHARMACOLOGICAL BULLETIN
2014年
10期
1367-1371,1372
,共6页
张铭慧%尹永强%康毅%娄建石
張銘慧%尹永彊%康毅%婁建石
장명혜%윤영강%강의%루건석
牛磺酸镁%心律失常%心室肌细胞%钙离子通道%全细胞膜片钳%胺碘酮
牛磺痠鎂%心律失常%心室肌細胞%鈣離子通道%全細胞膜片鉗%胺碘酮
우광산미%심률실상%심실기세포%개리자통도%전세포막편겸%알전동
taurine-magnesium coordination com-pound%arrhythmia%ventricular cardimyocytes%calcium ion channel%whole-cell patch clamp technique%amiod-arone
目的:观察牛磺酸镁配合物( taurine magnesium coordi-nation compound,TMCC)对缺氧/复氧损伤所致大鼠心室细胞异常L-型钙电流( ICa,L )的影响,以探讨其抗心律失常作用机制。方法酶解法分离大鼠单个心室肌细胞,应用全细胞膜片钳技术记录低(100μmol·L-1)、中(200μmol·L-1)、高(400μmol·L-1)3个浓度的牛磺酸镁及胺碘酮(24.24μmol·L-1)对缺氧/复氧大鼠心室细胞 ICa,L的影响。结果缺氧/复氧使大鼠心室肌细胞 ICa,L峰值从(3.35±0.50) pA/pF增大到(5.69±0.25) pA/pF(n=6, P<0.01),TMCC (100、200、400μmol·L-1)可使缺氧/复氧损伤模型增大的ICa,L峰值分别恢复到(5.28±0.18) pA/pF ( n =6, P >0.05)、(4.41±0.22) pA/pF、(3.82±0.21) pA/pF(n=6, P<0.01)。24.24μmol · L-1胺碘酮使其恢复为(3.66±0.27) pA/pF (n=6, P<0.01)。与正常对照组相比,缺氧/复氧使钙激活曲线左移,激活加快,失活曲线右移,失活减慢,TMCC (200、400μmol · L-1)和胺碘酮(24.24μmol · L-1)可恢复左移的激活曲线,使激活减慢,恢复右移的失活曲线,使失活加快。结论 TMCC可通过促进钙通道的失活以及抑制钙通道的激活过程,浓度依赖性地恢复缺氧/复氧损伤引起的钙电流增大,其作用与胺碘酮相当, TMCC对钙电流的抑制作用可能是其发挥抗心律失常的机制之一。
目的:觀察牛磺痠鎂配閤物( taurine magnesium coordi-nation compound,TMCC)對缺氧/複氧損傷所緻大鼠心室細胞異常L-型鈣電流( ICa,L )的影響,以探討其抗心律失常作用機製。方法酶解法分離大鼠單箇心室肌細胞,應用全細胞膜片鉗技術記錄低(100μmol·L-1)、中(200μmol·L-1)、高(400μmol·L-1)3箇濃度的牛磺痠鎂及胺碘酮(24.24μmol·L-1)對缺氧/複氧大鼠心室細胞 ICa,L的影響。結果缺氧/複氧使大鼠心室肌細胞 ICa,L峰值從(3.35±0.50) pA/pF增大到(5.69±0.25) pA/pF(n=6, P<0.01),TMCC (100、200、400μmol·L-1)可使缺氧/複氧損傷模型增大的ICa,L峰值分彆恢複到(5.28±0.18) pA/pF ( n =6, P >0.05)、(4.41±0.22) pA/pF、(3.82±0.21) pA/pF(n=6, P<0.01)。24.24μmol · L-1胺碘酮使其恢複為(3.66±0.27) pA/pF (n=6, P<0.01)。與正常對照組相比,缺氧/複氧使鈣激活麯線左移,激活加快,失活麯線右移,失活減慢,TMCC (200、400μmol · L-1)和胺碘酮(24.24μmol · L-1)可恢複左移的激活麯線,使激活減慢,恢複右移的失活麯線,使失活加快。結論 TMCC可通過促進鈣通道的失活以及抑製鈣通道的激活過程,濃度依賴性地恢複缺氧/複氧損傷引起的鈣電流增大,其作用與胺碘酮相噹, TMCC對鈣電流的抑製作用可能是其髮揮抗心律失常的機製之一。
목적:관찰우광산미배합물( taurine magnesium coordi-nation compound,TMCC)대결양/복양손상소치대서심실세포이상L-형개전류( ICa,L )적영향,이탐토기항심률실상작용궤제。방법매해법분리대서단개심실기세포,응용전세포막편겸기술기록저(100μmol·L-1)、중(200μmol·L-1)、고(400μmol·L-1)3개농도적우광산미급알전동(24.24μmol·L-1)대결양/복양대서심실세포 ICa,L적영향。결과결양/복양사대서심실기세포 ICa,L봉치종(3.35±0.50) pA/pF증대도(5.69±0.25) pA/pF(n=6, P<0.01),TMCC (100、200、400μmol·L-1)가사결양/복양손상모형증대적ICa,L봉치분별회복도(5.28±0.18) pA/pF ( n =6, P >0.05)、(4.41±0.22) pA/pF、(3.82±0.21) pA/pF(n=6, P<0.01)。24.24μmol · L-1알전동사기회복위(3.66±0.27) pA/pF (n=6, P<0.01)。여정상대조조상비,결양/복양사개격활곡선좌이,격활가쾌,실활곡선우이,실활감만,TMCC (200、400μmol · L-1)화알전동(24.24μmol · L-1)가회복좌이적격활곡선,사격활감만,회복우이적실활곡선,사실활가쾌。결론 TMCC가통과촉진개통도적실활이급억제개통도적격활과정,농도의뢰성지회복결양/복양손상인기적개전류증대,기작용여알전동상당, TMCC대개전류적억제작용가능시기발휘항심률실상적궤제지일。
Aim To investigate the effects of TMCC on abnormal L-type calcium current (ICa,L) in rat ventric-ular cardiomyocytes during hypoxia-reoxygenation to find out the mechanism of antiarrhythmic effect. Methods Whole-cell patch clamp was used to record ICa,L in the ventricular cardiomyocytes during hypoxia-reoxygenation in rat under amiodarone and different concentrations of TMCC. Results In hypoxia-reoxy-genation model, peak ICa,L increased from ( 3. 35 ± 0. 50 ) pA/pF to ( 5. 69 ± 0. 25 ) pA/pF ( n =6 , P <0. 01 ) , which was restored to ( 5. 28 ± 0. 18 ) pA/pF (n=6, P>0. 05),(4. 41 ± 0. 22) pA/pF, (3. 82 ± 0. 21)pA/pF(n=6, P<0. 01) by TMCC(100, 200, 400 μmol·L-1 ) and amidodarone 24. 24 μmol·L-1 restored peak ICa,L to(3. 66 ± 0. 27)pA/pF (n=6,P<0. 01 ) . Compared to control group, hypoxia-reoxy-genation turned ICa,L steady-state activation curves to left and inactivation curves to right, which quickened activation and slowed inactivation, TMCC ( 200, 400μmol · L-1 ) and amiodarone could restore the left shift activation curves and right shift inactivation curves. Conclusion TMCC can concentration-de-pendently restore the increase of calcium current due to hypoxia-reoxygenation by promoting inactivation process and inhibiting activation process, and the effect is equal to that of amiodarone. TMCC blocks ICa,L of the ventricular cardiomyocytes, which may be one of its antiarrhythmic mechanisms.