The protective effects of ischemia preconditioning on the lung injury following with limbs ischemia/reperfusion / 中国应用生理学杂志

<p><b>OBJECTIVE</b>To explore the protective effects of ischemic preconditioning (IPC) on the lung injury following with limbs ischemia /reperfusion (LI/R).</p><p><b>METHODS</b>The models of LI/R injury were constructed in rabbits. The blood from right external jugular vein and left common carotid artery, into and out-flowing pulmonary blood (IPB, OPB) respectively. Superoxide dismutase (SOD), malondialdehyde (MDA), nitric oxide (NO) in IPB and OPB and lung tissues were measured, as well as total nitric oxide synthase (tNOS) and inducible nitric oxide synthase (iNOS) in lung tissues were detected in different groups. The effects of IPC on the lung injury were observed.</p><p><b>RESULTS</b>Compared with sham and before ischemic, the activity of SOD decreased and the content of MDA and NO increased after 4 h ischemia followed by 4 h reperfusion in IPB, OPB and lung tissues. The activity of tNOS and iNOS in lung tissues increased remarkably as well, there was statistical significance (P < 0.05, P < 0.01). SOD increased and MDA, NO, tNOS, iNOS decreased significantly by IPC before ischemia/reperfusion. The correlation analysis indicated that MDA was negatively correlated with SOD and was positively correlated with MDA, NO, iNOS (P < 0.01).</p><p><b>CONCLUSION</b>Oxygen free radicals metabolic confusion of lung occurred in the course of LI/R, IPC could strengthen the resistance of peroxidation in lung and had protective effects on the lung injury following with LI/R.</p>

The protective effects of ischemic preconditioning on the kidney injury following with ischemia/reperfusion of limbs and the possible mechanisms / 中国应用生理学杂志

<p><b>AIM</b>To explore the protective effects of ischemic preconditioning on the kidney injury following with ischemia/reperfusion (I/R) of limbs.</p><p><b>METHODS</b>The models of I/R injury of limbs were constructed in rabbits. The blood from right external jugular vein, renal artery and renal vein represent the peripheral blood, into and out-flowing kidney blood (IKB, OKB) respectively. Superoxide dismutase (SOD), malondialdehyde (MDA), blood uria nitrogen (BUN) in peripheral blood and SOD, MDA, nitric oxide (NO) in IKB and OKB were measured, as well as SOD, MDA, induced nitric oxide synthase (iNOS) in kidney were detected in different groups. The effects of ischemic preconditioning (IPC) on the kidney injury were observed.</p><p><b>RESULTS</b>Compared with control group, the activity of SOD in peripheral blood, IKB, OKB and kidney decreased, and the content of MDA increased after 4 h ischemia followed by 4 h reperfusion. The content of BUN in peripheral blood, NO in IKB, OKB and iNOS in kidney increased remarkably as well. SOD increased and MDA, NO, BUN, iNOS decreased significantly by ischemic preconditioning (IPC) before ischemia/reperfusion. The correlation analysis indicated that MDA was negatively correlated with SOD and positively correlated with NO, BUN.</p><p><b>CONCLUSION</b>Oxygen free radicals metabolic confusion of kidney occurred in the course of I/R of limbs, IPC could strengthen the resistance of peroxidation in kidney and had protective effects on the kidney injury following with ischemia/reperfusion (I/ R) of limbs</p>

Influence of astragalus and zinc sulfate on the viscosity in erythrocyte membrane during intestinal ischemia - reperfusion(I/R) injury / 中国应用生理学杂志

<p><b>AIM</b>To study the influence of astragalus and zinc sulfate on the viscosity in erythrocyte membrane during intestinal I/R and their mechanism of action.</p><p><b>METHODS</b>Models of rabbits intestinal I/R injury were made. The effect of astragalus and zinc sulfate on the viscosity and malondialdehyde (MDA) in erythrocyte membrane, superoxide dismutase (SOD) in erythrocyte, oxidase (XO) in plasma and MDA tissues homogenate were observed.</p><p><b>RESULTS</b>The administration of astragalus and zinc sulfate decreased viscosity and MDA and XO, prevented the reduction of SOD, and alleviated I/R injury.</p><p><b>CONCLUSION</b>Lipid peroxidation injury of the erythrocyte membrane was one of the pathogenesis of I/R injury, and astragalus and the zinc sulfate possessed effects of anti-lipid peroxide, stabilized erythrocyte membrane, increased red blood cell deform ability and raised microcircular perfusion.</p>