Effect of disseminated necrosis of the heart on uptake of radioactive precursors into RNA of internal mitochondrial membranes of the rat myocardium

The role of the internal mitochondrial membranes of the rat myocardium as the site of uptake of radioactive precursors into mitochondrial RNA was studied. The kinetics of the changes in specific RNA activity of the internal mitochondrial membranes of the myocardium was found to differ in vivo and in vitro. Necrosis of the myocardium, in experiments in vivo and in vitro, caused significant changes in the specific RNA activity of the mitochondrial membranes in the same direction.Institute of General Pathology and Pathophysiology, Academy of Medical Sciences of the USSR, Moscow. (Presented by Academician of the Academy of Medical Sciences of the USSR A. M. Chernukh.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 84, No. 11, pp. 570–572, November, 1977.     

前列腺素E_1预处理对异丙肾上腺素性心肌损伤的保护作用

目的　探讨前列腺素E1(PGE1)预处理对急性心肌梗塞的早期和延迟保护作用。方法　ivPGE1(2 5mg·kg-1和15 0mg·kg-1)对大鼠进行预处理 ,分别于预处理后 2 0min或 2 4hip异内肾上腺素 (80mg·kg-1)造成急性心肌梗塞 ,于ip异丙肾上腺素后 2 4h取出心脏、匀浆 ,测定其丙二醛(MDA)含量 ,谷胱甘肽过氧化物酶 (GSH Px)活性 ,总超氧化物歧化酶 (T SOD)和锰 超氧化物歧化酶 (Mn SOD)活性。结果　心肌梗塞模型组心肌MDA含量明显上升 ,GSH Px活性降低 ,T SOD和Mn SOD活性增高。与模型组比较 ,两剂量PGE1预处理后 2 0min及 2 4h的各组均明显降低梗塞心肌的MDA含量 (P <0 0 1)和T SOD、Mn SOD活性 (均P<0 0 1) ,提高GSH Px活性 (P <0 0 1)。结论　前列腺素E1预处理具有预适应性早期和延迟心肌保护作用。     

4种不同中医治法干预异丙肾上腺素致大鼠心肌肥大的研究

目的 :研究4种不同中医治法对异丙肾上腺素致大鼠心肌肥大的影响。 方法 :以异丙肾上腺素连续3 d以20,10,5 mg ·kg^-1递减sc,3 mg ·kg^-1维持7 d制备大鼠心肌肥大模型,造模成功后分别给予金匮肾气丸、补阳还五汤、生脉饮及真武汤10周干预,观察大鼠血流动力学指标、心输出量、心脏质量指数、左心室质量指数以及血清心房利钠肽(ANP)、脑钠肽(BNP)含量的变化。 结果 :金匮肾气丸、补阳还五汤能够有效提高左室收缩峰压(LVSP)、左室内压最大收缩率(+dp/dt_max)及心输出量( P <0.05),降低心脏指数、左心室指数及ANP,BNP水平( P <0.05)。生脉饮和真武汤对于心输出量、心肌舒缩功能、心脏指数、左心室指数及血清ANP,BNP含量均无明显作用。 结论 :益气活血法和温补肾阳法可以显著改善大鼠心肌收缩功能,增加心输出量,抑制心肌肥大,降低神经体液因子水平。     

Antisense oligonucleotide eluforsen improves CFTR function in F508del cystic fibrosis

BackgroundCystic fibrosis (CF) is caused by mutations in the CF transmembrane conductance regulator (CFTR) gene. In this study we assessed the effect of antisense oligonucleotide eluforsen on CFTR biological activity measured by Nasal Potential Difference (NPD) in patients with the most common mutation, F508del-CFTR.MethodsThis multi-centre, exploratory, open-label study recruited adults with CF homozygous or compound heterozygous for the F508del-CFTR mutation. Subjects received intranasal eluforsen three times weekly for 4 weeks. The primary endpoint was the within-subject change from baseline in total chloride transport (Cl-free+iso), as assessed by NPD. Secondary endpoints included within-subject change from baseline in sodium transport.ResultsIn the homozygous cohort (n = 7; per-protocol population), mean change (90% confidence interval) in Cl-free+iso was ?3.0 mV (?6.6; 0.6) at day 15, ?4.1 mV (?7.8; ?0.4, p = .04) at day 26 (end of treatment) and ? 3.7 mV (?8.0; 0.6) at day 47. This was supported by improved sodium transport as assessed by an increase in average basal potential difference at day 26 of +9.4 mV (1.1; 17.7, p = .04). The compound heterozygous cohort (n = 7) did not show improved chloride or sodium transport NPD values. Eluforsen was well tolerated with a favourable safety profile.ConclusionsIn F508del-CFTR homozygous subjects, repeated intranasal administration of eluforsen improved CFTR activity as measured by NPD, an encouraging indicator of biological activity.     

Cardioprotective effect of fenugreek on isoproterenol-induced myocardial infarction in rats

Objectives:

This study is designed to evaluate the cardioprotective effect of fenugreek on isoproterenol- induced myocardial infarction and is investigated by an in vivo method in rats.

Materials and Methods:

Male Wistar albino rats were divided into four groups (n=10). Group I received 0.5% CMC treated as normal control group. Group II received isoproterenol (85 mg/kg body weight) intraperitoneal (i.p.) for two consecutive days (14^th and 15^th days). Group III received fenugreek (250 mg/kg body weight) intragastric intubation for 15 days. Group IV rats received fenugreek as in Group III and additionally isoproterenol was given for two consecutive days (14^th and 15^th days).

Results:

The results described the cardioprotective effect that observed in Group IV showed significantly (P< 0.05) decreased levels of TBARS and enhanced the activities of both enzymatic and non-enzymatic antioxidants (SOD, CAT, GPx and GSH) in myocardial infarcted rats when compared to Groups II and III. Histopathological studies were also co-relating with the above biochemical parameters.

Conclusion:

These findings concluded the cardioprotective effect of fenugreek on lipid peroxidation and antioxidant defense system during isoproterenol-induced myocardial infarction in rats.     

不同中医治法对异丙肾上腺素致大鼠心肌肥大的比较研究

目的观察不同中医治法对异丙肾上腺素致大鼠心肌肥大的干预作用。方法以异丙肾上腺素20 mg/kg1、0 mg/kg、5mg/kg递减皮下注射,3 mg/kg维持7 d制备大鼠心肌肥大模型,给予金匮肾气丸、真武汤、补阳还五汤及生脉饮5周,观察大鼠血流动力学指标、心输出量、心脏指数、左心室指数以及血清心房利钠肽（ANP）、脑钠肽（BNP）、血管紧张素Ⅱ（AngⅡ）及去甲肾上腺素（NE）含量的变化。结果异丙肾上腺素造模5周后,模型组大鼠血流动力学处于代偿状态,与正常组比较差异无统计学意义（P〉0.05）;但心输出量明显降低,血清ANP、BNP含量显著升高,心脏指数及左心室指数增加（P〈0.05）。与模型组比较,补阳还五汤组及金匮肾气丸组能够有效提高心输出量,降低血清ANP、BNP水平,降低心脏指数（P〈0.05）。生脉饮组和真武汤组能够降低血清ANP含量,对于模型大鼠心脏指数及血清BNP含量均无明显作用（P〉0.05）,但是有降低心输出量及心肌收缩功能的作用。结论益气活血法和温补肾阳法能够有效改善异丙肾上腺素致大鼠心肌肥大的血流动力学状况,改善过度激活的神经体液水平。     

双龙方配伍配比对大鼠急性心肌缺血模型的影响

目的:验证中药双龙方配伍的合理性和科学性.方法:通过盐酸异丙肾上腺素造成大鼠的急性心肌缺血模型,从生理层面(心电图)、病理层面(心肌梗死面积)和细胞分子层面(细胞酶学指标CK,LDH,SOD,MDA含量变化),观察单方以及双龙方不同配比预防给药对心肌缺血的拮抗作用.结果:各给药组均能改善心电图缺血指标、降低血清中CK,LDH,SOD,MDA含量及减少心肌梗死面积,但双龙方配伍高剂量组比其他组具有更好的效果,其中以3:7高剂量组效果最优.结论:药效学筛选结果表明,按照双龙方配比3:7高剂量对防治大鼠急性心肌梗死效果最优.