慢性肾衰患者血清中分子物质浓度变化及其对Na,K-ATP酶的抑制作用

Sera from patients with different courses of chronic renal failure and healthy persons were separated by gel permeation chromatography,and the concentration of middle molecular fraction B were calculated.The concentration of fractions B was increasing with the aggravating of renal failure degree,which indicated that the concentration of fraction B was related to patients′ renal failure.Fractions B from uremic urine,uremic sera or normal urine were resolved into 10 to 17 sub-fractions by ion exchange chromatography.Sub-fractions from normal urine and from uremic sera were assayed for their inhibition for the activity of Na,K-ATPase.The results showed that the Na,K-ATPase activities of the samples with B-8 and B-9 were much lower than that of blank.It is indicated that B-8 and B-9 contained some compounds which could inhibit the activity of Na,K-ATPase.

在低盐度胁迫下鲻幼鱼鳃丝Na^+-K^+-ATP酶活性及其β亚基mRNA表达与显微结构变化

探讨在低盐度胁迫下鲻(Mugil cephalus)幼鱼鳃丝Na+-K+-ATP酶活性、Na+-K+-ATP酶β亚基mRNA表达量变化以及对鳃丝组织显微结构的影响.结果表明:在盐度分别为20(对照组),15,10,5和0实验条件下,20d后各低盐度组鳃丝Na+-K+-ATP酶活性均高于对照组;0和5盐度组鳃丝Na+-K+-ATP酶活性在实验过程中表现为持续上升的趋势,前期升高幅度大,后期升高幅度减小;10和15盐度组鳃丝Na+-K+-ATP酶活性在15d后达到峰值,至20d呈现小幅下降趋势.鳃丝Na+-K+-ATP酶β亚基mRNA表达的变化趋势与Na+-K+-ATP酶活性的变化趋势基本保持同步,显示出了其对Na+-K+-ATP酶活性的调控作用.对鳃丝显微结构观察的结果显示,随着盐度的降低,鲻幼鱼鳃小片逐渐变宽,伴随间距缩小,同时泌氯细胞数量逐渐减少,体积缩小,扁平细胞体积增大,黏液细胞数量增多.这表明在低盐度胁迫下鲻幼鱼鳃的生理功能和组织结构具有随外界水体盐度变化的适应能力.

Effects of Dingjifumai Decoction on Electrocardiogram and sodium potassium pump of rats with ventricular arrhythmia

Objective:To investigate the effect of Dingjifumai Decoction(DJFM)on Electrocardiogram(ECG)and sodium potassium pump in rats with ventricular arrhythmia.Methods:Forty healthy male SD rats(200±20g)were randomly divided into blank group,model group,Metoprolol group and DJFM group.Ten rats in each group were fed with normal diet and free drinking water.Each group was given gavage,and the amount of gavage in each group was calculated according to body weight.In the model group,0.001%Aconitine was injected into the tail vein at 30ug/kg.In the Metoprolol group,Metoprolol suspension was given according to the standard of 5.2mg/kg per day.In the DJFM group,DJFM was given at 17.6g/kg per day.After 2 weeks of administration,the biologic experiment system BL-420F was used to monitor the II lead ECG curve,and the ECG changes were observed and recorded.Then,the left ventricle of the rat was taken,and part of the heart tissue sodium potassium pump was detected.Results:(1)The effect of DJFM on ECG of rats with ventricular arrhythmia:After intravenous injection of aconitine,the incidence of Ventricular Premature beat(VP),Ventricular Tachycardia(VT),Ventricular Fibrillation(VF)in the model group was 100%,suggesting that the model building of rats with ventricular arrhythmia was successful.(2)VP,VT,and VF time:Compared with model group,DJFM group and Metoprolol group can significantly delay the VP,VT and VF,the difference was statistically significant(P<0.05).The effect of DJFM group and Metoprolol group on delaying the appearance of VP,VT and VF was the same,there was no significant difference(P>0.05).(3)The effect of DJFM on sodium potassium pump in rat ventricular arrhythmia heart tissues:Compared with the blank group,the sodium potassium pump value in the model group was significantly decreased,and the difference was statistically significant(P<0.05).Compared with the model group,the sodium potassium pump value of the tissues in the Metoprolol group and the DJFM group increased,and the difference was statistically significant(P<0.05).There was no significant difference in sodium potassium pump between the Metoprolol group and the DJFM group(P>0.05).Conclusion:1.The rat model of ventricular arrhythmia can be successfully prepared by intravenous injection of Aconitine.2.DJFM can prolong the occurrence time of cardiac arrhythmias caused by aconitine in rats,such as VP,VT,VF,et al.The mechanism may be related to fast Na^+channel,and it may prevent and control arrhythmias by inhibiting Na^+influx and reducing the fast response cellular self-discipline.3.DJFM can protect the myocardial tissue sodium potassium pump,which can protect the myocardial cells and improve the myocardial metabolism.

缺血对失神经肌肉超微结构及酶组织化学的影响

目的 研究肢体缺血对失神经支配骨骼肌组织学、超微结构及Na、K ATP酶和Ca ATP酶活性的影响。方法 选用SD大鼠 2 4只 ,建立双下肢失神经支配腓肠肌实验模型后 ,结扎右侧股动脉 ,观察肌细胞的组织学 ,超微结构及Na、K ATP酶和Ca ATP酶活性变化。结果 缺血侧肢体肌细胞直径及截面积较对照侧下降速度快 2 5 .48%及 3 2 .3 3 % (t =2 .94,P <0 .0 5 ;t=2 .88,P <0 .0 5 ) ;缺血加速肌细胞线粒体 ,肌质网退变 ;Na、K ATP酶活性术后 2周实验侧较对照侧增高5 9 .68% ,而术后 4周缺血侧较对照侧下降 17.45 % (t =2 .2 4,P <0 .0 5 ) ;Ca ATP酶活性下降速度缺血侧较对照侧分别快 2 6.42 %及 2 1.87% (t =2 .64、2 .2 4,P <0 .0 5 )。结论 缺血加速失神经支配骨骼肌萎缩的发生与发展 ,周围神经损伤合并肢体动脉损伤时 ,动脉尽可能予以全部修复。