Study on absorption kinetics of astragaloside IV in rats intestines / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the mechanisms of intestine absorption of astragaloside IV in rat.</p><p><b>METHOD</b>The K(a) and P(app) of astragaloside IV was investigated using single-pass intestinal perfusion technique in rats. HPLC was used to determine the concentration of astragaloside IV. The effect of absorption site, drug concentration and the inhibitors of P-glycoproteon on the absorption had been studied.</p><p><b>RESULT</b>By the testing of the statistics, the K(a) and the P(app) values of the duodenum, jejunum, ileum, colonic had significant differences (P < 0.05). The concentration from 20-80 mg x L(-1) had no distinctive effect on the K(a) and P(app) of small intestine. The inhibitors of P-glycoproteon had no distinctive effect on the absorption of small intestine.</p><p><b>CONCLUSION</b>Astragaloside IV is absorbed by typical passive diffusion mechanism.</p>

Effects of Zhikeping on aortic oxyradical and the expression of ICAM-1 in a rat model of experimental early atherosclerosis / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the effects of Zhikepingon the oxyradical andintercellular adhesion molecule-1 (ICAM-1) of experimental early atherosclerosis.</p><p><b>METHOD</b>The model of SD rat early atherosclerosis was induced by cholesterol diet. The suspension of Zhikeping and simvastatin were administered intragastrically, respectively. After 10 weeks, the serum lipids, superoxide dismutase (SOD) and maleic dialdehyde (MDA) were detected by automatic biochemistry analyzer. ICAM-1 and its expression of mRNA in aortic wall were detected- by immunohistochemistry and RT-PCR, respectively. Aortic histomorphology was cbserved by HE stainning.</p><p><b>RESULT</b>The results showed that the serum lipids, superoxide dismutase (SOD) and maleic dialdehyde (MDA) of treated groups were obviously improved as compared with those of the control group. The tissue pathological damage was improved indifferent degree, and ICAM-1 and its expression of mRNA was decreased obviously.</p><p><b>CONCLUSION</b>It is suggested the mechanism of anti-atherosclerosis of Zhikeping have close relationship with the function of its anti-oxidizing and anti-adhesiveness that can protect aortic endothelial cell.</p>