Effects of paeoniflorin on pathological changes in global brain ischemia model rats / 中国中药杂志

<p><b>OBJECTIVE</b>To explore the effects of paeoniflorin on blood brain barrier and pathological changes in brain ischemia.</p><p><b>METHOD</b>Mice were divided into sham operation group, model group, positive control group-Deng zhanhua tablet group and three different dose (high, middle, low-dose) groups of paeoniflorin. The neurological symptoms of rats were observed. The SOD of ischemic brain tissue, MDA BBB and EAA contents were determined. The ultrastructure on the brain cells was inspected by transmission electron microscope.</p><p><b>RESULT</b>Paeoniflorin had the protetive effects on 4VO model of total cerebral ischemia. Paeoniflorin could obviously increase SOD content, reduce MDA content in rat brain-tissue and alleviate oxidative stress damage by cerebral ischemia on rat brain. Paeoniflorin could improve pathological changes of cell nuclear, perikaryon, mitochondria and myelin sheath, which was the morphologic basis of the protective effect on ischemia. Paeoniflorin could alleviate the incrense of EAA content caused by and hypoxia and inhibit the excitatory neural toxicity by EAA.</p><p><b>CONCLUSION</b>Paeoniflorin has the protection effect on the brain edema after cerebral ischemia, the oxidative stress damage on brain tissue, the ultrastructure lesions of cells and the BBB. The protective mechanism may be related to inhibiting intracellular calcium overload, anti-free radical and reducing EAA content.</p>

Effects of paeoniflorin on cerebral energy metabolism, nitric oxide and nitric oxide synthase after cerebral ischemia in mongoliagerbils / 中国中药杂志

<p><b>OBJECTIVE</b>To explore the effects of paeoniflorin on antagonising the delayed neuronal death (DND) induced by cerebral ischemia,and the relation between DND, cerebral tissue energy metabolism, nitric oxide (NO) and nitric oxide synthase (NOS).</p><p><b>METHOD</b>Incomplete cerebral ischemia induced was induced by ligating bilateral arteries carotis communis for 20 min followed by reperfusion 48 h in rats. The indexes including Na(+)-K(+)-ATPase activity, lactic acid content, Ca(2+)-ATPase, Mg(2+)-ATPase activity, NO content and NOS activity were determined in fore brain cortex at 48 h after reperfusion.</p><p><b>RESULT</b>Na(+)-K(+)-ATPase, Ca(2+)-ATPase and Mg(2+)-ATPase activity were lowered (P < 0.01), NO level was decreased (P < 0.01), NOS activity dropped (P < 0.01) in cerebral tissue at 48h after reperfusion, but lactic acid level had no change. Paeoniflorin could prevent reduction of Na(+)-K(+)-ATPase activity (P < 0.05, P < 0.01), increase NO level (P < 0.01), enhance NOS activity (P < 0.01) at 48h after reperfusion.</p><p><b>CONCLUSION</b>DND induced by ischemia may be concerned with energy metabolism disorder and decrease of NO formation. Paeoniflorin may play the role of antagonising cerebral ischemia by adjusting cerebral energy metabolism and nitric oxide formation.</p>