Effects of melatonin on anti-oxidative function of lung injury induced by lipopolysaccharide in rats and ICAM-1 expression / 中国应用生理学杂志

<p><b>AIM</b>To investigate the protective effect of melatonin (MT) on lung tissues during acute lung injury (ALI) in rats and its possible mechanism.</p><p><b>METHODS</b>All rats were randomly divided into four groups: control group, lipopolysaccharide (LPS) group, dexamethasone (DEX) and MT treatment group. Myeloperoxidase (MPO) activity, superoxide dismutase (SOD) activity and malonaldehyde (MDA) content of lung tissues were detected at 3, 6 and 12 h after intratracheal instillation in each group. In addition, the expression of intercellular adhesion molecule-1 (ICAM-1) were observed through immunohistochemistry staining in lung tissues.</p><p><b>RESULTS</b>Compared with control group, SOD activity decreased significantly in LPS group (P < 0.01), but MPO activity,MDA content and the expression of ICAM-1 increased obviously (P < 0.01). The administration of MT and DEX mitigated above changes significantly (P < 0.05 or P < 0.01).</p><p><b>CONCLUSION</b>MT possessed protective effect on lung tissues during ALI through scavenging free radicals and inhibiting the expression of ICAM-1 probably.</p>

Protective role of endogenous carbon monoxide to lung and kidney tissues during septic shock / 中国应用生理学杂志

<p><b>AIM</b>To study the protective role of endogenous carbon monoxide to lung and kidney tissues during septic shock and its mechanism.</p><p><b>METHODS</b>A rat model of CLP was built by using the method of CLP. The malondialdehyde (MDA) content and the activity of superoxide dematase (SOD) in blood, lung and kidney were detected by immunohistochemical technique and light microscope.</p><p><b>RESULTS</b>Pathological changes of lung and kidney in CLP + Hemin group were lighter than CLP group, inflammatory reaction and lipid peroxidation were also lighter.</p><p><b>CONCLUSION</b>Endogenous CO can protect lung and kidney from the oxidative injury. It can suppress in flammation and the oxidative injury caused by activated inflammatory cells, it is probably an important mechanism of its protective effects.</p>