人参皂苷单体Re对大鼠心肌细胞缺氧的作用

目的 观察人参皂苷单体Re对大鼠心肌细胞缺氧的保护作用并探讨其机制.方法 SD大鼠乳鼠心肌细胞原代培养,按照随机数字表法分为5组,每组6个样本.正常对照组细胞常规培养;缺氧对照组细胞常规培养48 h再缺氧培养12 h;另外3组细胞先常规培养48 h,分别用20、40、80 g/L人参皂苷单体Re预处理30 min再缺氧12 h,相对应设为单体Re低、中、高浓度组.采用ELISA法检测心肌细胞上清液中乳酸脱氢酶(LDH)活性,荧光漂白恢复(FRAP)实验观察细胞间连接通讯,以FRAP率表示结果.数据处理行组间或配对t检验.结果 (1)与缺氧对照组细胞LDH活性[(403±22)U/L]比较,单体Re低、中、高浓度组均明显降低,分别为(255±16)、(241±13)、(237±24)U/L(t值分别为5.1、5.2、8.3,P值均小于0.05).(2)细胞经激光淬灭后10 min,正常对照组FRAP率为(74.8±3.6)%;缺氧对照组FRAP率为(13.2±5.6)%;单体Re低、中、高浓度组FRAP率分别为(34.3±3.9)%、(36.2±3.1)%、(39.5±2.9)%,与缺氧对照组比较,差异均有统计学意义(t值分别为18.3、-41.9、-6.6,P值均小于0.05).结论 采用人参皂苷单体Re预处理可降低缺氧大鼠心肌细胞LDH的释放,明显改善细胞间连接通讯,对缺氧心肌细胞有明显的保护作用,剂量尤以20 g/L为适宜.

Abstract：

Objective To investigate the protective effect of ginsenoside Re on myocardial cells of neonatal SD rat with hypoxia injury,and to explore its mechanism. Methods The primary passage of myocardial cells collected from neonatal SD rats were divided into A group (with ordinary treatment),B group[exposed to hypoxia (1% O2,5% CO2,94% N2) for 12 hours after being cultured for 48 hours],C group (pretreated with 80 g/L ginsenoside Re for 30 minutes after 48 hours of ordinary culture,then exposed to hypoxia for 12 hours),D group (received the same treatment as used in C group except for using 40 g/L ginsenoside Re),E group (received the same treatment as used in C group except for using 20 g/L ginsenoside Re) according to the random number table,with 6 samples in each group. Myocardial cell supernatants were collected for determination of content of lactate dehydrogenase (LDH) with enzyme linked immunosorbent assay. Fluorescence recovery after photobleaching technique was used to detect gap junction intercellular communication (GJIC).Result was observed by laser scanning confocal microscope. Data were processed with paired t test. Results (1) Compared with that in B group[(403±22)U/L],contents of LDH in E,D,and C groups were obviously decreased[(255±16),(241±13),(237±24)U/L,with t value respectively 5.1,5.2,8.3,P values all below 0.05]. (2) The fluorescence recovery rate in A group was (74.8±3.6)% 10 min after quenching,which was higher than that in B group[(13.2±5.6)%,t=15.2,P<0.01]. The fluorescence recovery rate in C,D,and E groups was respectively (39.5±2.9)%,(36.2±3.1)%,and (34.3±3.9)% 10 min after quenching,all higher than that in B group (with t value respectively -6.6,-41.9,18.3,P values all below 0.05). Conclusions Ginsenoside Re pretreatment,particularly with a dose of 20 g/L,can protect myocardial cells from hypoxia injury,and the effect may be attributable to inhibition of release of LDH and improvement of the GJIC function.

Protective effect of ginsenoside Re on myocardial cells of neonatal SD rat subjected to hypoxia injury

Objective To investigate the protective effect of ginsenoside Re on myocardial cells of neonatal SD rat with hypoxia injury,and to explore its mechanism. Methods The primary passage of myocardial cells collected from neonatal SD rats were divided into A group (with ordinary treatment),B group[exposed to hypoxia (1% O2,5% CO2,94% N2) for 12 hours after being cultured for 48 hours],C group (pretreated with 80 g/L ginsenoside Re for 30 minutes after 48 hours of ordinary culture,then exposed to hypoxia for 12 hours),D group (received the same treatment as used in C group except for using 40 g/L ginsenoside Re),E group (received the same treatment as used in C group except for using 20 g/L ginsenoside Re) according to the random number table,with 6 samples in each group. Myocardial cell supernatants were collected for determination of content of lactate dehydrogenase (LDH) with enzyme linked immunosorbent assay. Fluorescence recovery after photobleaching technique was used to detect gap junction intercellular communication (GJIC).Result was observed by laser scanning confocal microscope. Data were processed with paired t test. Results (1) Compared with that in B group[(403±22)U/L],contents of LDH in E,D,and C groups were obviously decreased[(255±16),(241±13),(237±24)U/L,with t value respectively 5.1,5.2,8.3,P values all below 0.05]. (2) The fluorescence recovery rate in A group was (74.8±3.6)% 10 min after quenching,which was higher than that in B group[(13.2±5.6)%,t=15.2,P<0.01]. The fluorescence recovery rate in C,D,and E groups was respectively (39.5±2.9)%,(36.2±3.1)%,and (34.3±3.9)% 10 min after quenching,all higher than that in B group (with t value respectively -6.6,-41.9,18.3,P values all below 0.05). Conclusions Ginsenoside Re pretreatment,particularly with a dose of 20 g/L,can protect myocardial cells from hypoxia injury,and the effect may be attributable to inhibition of release of LDH and improvement of the GJIC function.