摘要
目的:观察抗钠钙交换体(Sodium calcium exchanger,NCX)特异位点_(124)HNFTAGDLGPSTIVGSAAFNMF_(145)抗体对正常成年大鼠心室肌细胞钙瞬变的影响。方法:利用Langendorff灌流方法,分离得到单个大鼠心室肌细胞;负载荧光染料Fura-2/AM和2%牛血清白蛋白后,利用离子影像分析系统记录激发光为340 nm和380 nm时心室肌细胞成对系列图像,计算钙瞬变峰值(F340/F380)、细胞钙恢复90%时程(TR_(90))以及钙敏感性(F340/F380与细胞缩短数值的比值)。结果:抗NCX特异位点抗体可以增加正常成年大鼠单个心室肌细胞F340/F380,缩短TR_(90),对钙敏感性无显著影响;尼卡地平和KB-R7943分别预处理心室肌细胞可以抵消大部分抗体对F340/F380和TR_(90)的增加或缩短效应,联合使用二者预处理心室肌细胞后,该抗体对钙瞬变不再有显著影响。结论:抗NCX特异位点_(124)HNFTAGDLGPSTIVGSAAFNMF_(145)抗体可以增加心室肌细胞钙瞬变峰值,同时缩短细胞钙恢复时程,这种效应主要与其激动L-型Ca^(2+)通道和NCX的作用有关。
Objective：To investigate the effects of site specific （124 HNFTAGDLGP STIVGSAAFNMF145 ） antibody of Sodium calcium exchanger （ NCX） on calcium transient in single ventricular myocytes of normal adult rats .Methods： Isolated adult rat hearts were perfused using Langendorff method and single ventricular myocytes were then obtained .The ventricular myocytes were incubated with Fuar-2/AM and 2% bovine serum albumin for about 40 min and then,the fluorescence images were recorded when excitation wavelengths were 340 nm and 380 nm using ion imaging system.Fluorescence value F340/F380,length of cell shortening ,time to 90%restore（ TR90 ） and calcium sensitivity （ ratio of F340/F380 and cell shortening ） were calculated.Results：The site specific antibody of NCX increased F340/F380 and decreased TR90 in single ventricular myocytes ,but had no more significant effect on calcium sensitivi-ty.Pretreatment with KB-R7943 or Nicardipine could significantly inhibit the TR 90 decrease or F340/F380 increase induced by the anti-body.Pretreating ventricular myocytes with combination of KB-R7943 and Nicardipine ,the antibody had no more significant effects on calcium transient.Conclusion：Site specific （ 124 HNFTAGDLGPSTIVGSAAFNMF145 ） antibody of NCX could increase calcium transient and accelerate the decrease of intracellular calcium during diastole ,which mainly related to its effects of activating L-type Ca2＋channel and NCX.
作者
白晓洁
吴博威
BAI Xiao-Jie;WU Bo-Wei(Department of Physiology, Shanxi Key Laboratory of Cellular Physiology, Shanxi Medical University, Taiyuan 030001, China)
出处
《中国免疫学杂志》
CAS
CSCD
北大核心
2017年第12期1795-1798,共4页
Chinese Journal of Immunology
