Effect of miR-206 on lower limb ischemia-reperfusion injury in rat and its mechanism

Lower limb ischemia-reperfusion is a common pathological process during clinical surgery. Because lower limb ischemia-reperfusion usually aggravates ischemia-induced skeletal muscle tissue injury after lower limb ischemia-reperfusion, it also causes remote organ heart, intestine, liver, lung and other injuries, and there is no effective clinical treatment for lower limb ischemia-reperfusion injury, so it is urgent to study its injury mechanism. In this study, the rat model of lower limb ischemia-reperfusion was established by clamping the femoral artery with microarterial clips, and the wall destruction such as intimal injury, cell edema, collagen degeneration, neutrophil infiltration, and elastic fiberboard injury of the femoral artery wall was detected. The expression of inflammatory factors was detected by immunohistochemistry. miR-206 preconditioning was used to observe the expression of inflammatory factors, redox status and apoptosis in the vascular wall of rats after acute limb ischemia-reperfusion. Our findings suggest that vascular endothelial cell edema increases, wall thickening, neutrophil infiltration, and elastic fiber layer damage during IRI. Inflammatory factor expression was increased in femoral artery tissue, and miR-206 expression levels were significantly down-regulated. Further studies have found that miR-206 attenuates lower limb IRI by regulating the effects of phase inflammatory factors. In this study, we investigated the effect of miR-206 on inflammatory factors and its possible role in the development of lower limb IRI, providing new research ideas for the regulatory mechanism of lower limb IRI, and providing a certain theoretical basis for the treatment of lower limb ischemia-reperfusion injury after surgery or endovascular intervention.

[Quantitative determination of liensinine in the embryo Nelumbinis (Nelumbo nucifera Gaertn.) by TLC-scanning]

The content of liensinine in the green seed embryo of Nelumbo nucifera was determined by dual-wavelength TLC-scanning. The crude drug was extracted with two different method of impregnating and refluxing. The content of liensinine was determined to be 0.853% and 0.939% and the average recovery was 97.9% and 100.9% respectively.

[A study on phenytoin pharmacokinetics in 15 patients with refractory epilepsy]

Monitoring of serum concentration and studying of individual clinical pharmacokinetics of phenytoin (PHT) were made in 15 patients with refractory epilepsy who had taken PHT and other antiepileptic drugs for a long time. The results showed that 10 of them were tolerant to PHT and their effective doses were higher than the routine ones; 2 of them showed striking fluctuation of serum PHT concentration within 24 hours; In the remaining patients serum PHT concentration during menstruation was much lower than that during ovulation. According to their different characteristics we gave them reasonable and individualized adjustment in dose and time interval of taking PHT. The seizures of all the patients were controlled satisfactorily. It is suggested that some of the patients with refractory epilepsy may have special PHT pharmacokinetics.