AIM To investigate the effects of low dosage of nitric oxide synthesis (NOS) inhibitor NG-nitro-L-argininemethyl ester (L-NAME) in long-term treatment on hyperdynamic circulatory state in rats with cirrhosis.METHODS Cirrhosis model was induced in male SD rats by injection of 60% CC14 oily solutionsubcutaneously. Cirrhotic rats were treated with L-NAME (0.5 mg·kg-1·d-1) by gavage for two weeks. Meanarterial pressure (MAP), cardiac output (CO), cardiac index (CI), splanchnic vascular resistance (SVR),splanchnic blood flow (SBF) and serum NO levels were determinded in L-NAME-treated, L-NAME-untreated cirrhotic rats and controls by using 57Co-Labled microsphere technique and a fluorometric assay,respectively.RESULTS Untreated cirrhotic rats had significantly lower MAP, SVR and higher PP, CO, CI, SBF andNO concentration than controls ( 14.42±0,47 kPa vs 17.05±0.34 kPa, 2.974±0.186 kPa·mL-1·min-1 vs4.234±0.118 kPa·mL-1·min-1, 1.665±0.067 kPa vs 1.123±0.096 kPa, 189.99±9.26 mL/min vs 135.5±3.55 mL/min, 55.89±1.82 mL-1·min-1·100g-1 BW vs 39.68±1.64 mL-1·min-1·100g-1 BW, 4.60±1.25μmol/L vs 0.53±0.26 μmol/L, P<0.01, respectively). In treated cirrhotic rats, L-NAME significantlyattenuated the increase of CO, CI, SBF, NO concentration and the decrease of MAP and SVR. In treatedcirrhotic rats, L-NAME induced a marked decrement of NO concentration than untreated cirrhotic rats(1.471 ±0.907 μmol/L vs 4.204±1.253 μmol/L, P<0.01).CONCLUSION The endogenous NO may play an important role in the changes of hemodynamics pattern incirrhosis,and hyperdynamic circulatory state in rats with cirrhosis can be ameliorated by long-term low doseL-NAME treatment.

Histopathological changes in rat liver in hyper-and hypothyroidism are associated with DNA methyltransferase activity

血清、尿TIMP-1浓度对肾脏病病程的判断价值

目的:探讨血清、尿金属蛋白酶组织抑制因子-1(TIMP-1)浓度对肾脏纤维化的诊断价值.方法: 以酶联免疫吸附检测(ELISA)方法检测健康者及肾脏病患者血清、尿TIMP-1浓度.结果: ①以血清TIMP-1浓度显著增高来判断肾组织有无纤维化敏感性为89%,特异性为94%,与肾活检符合率为85%.②尿TIPM-1浓度与尿蛋白呈正相关(r=0.53,P＜0.01).结论: 血清TIMP-1浓度可作为判断慢性肾脏病人肾纤维化的无损伤性检查指标.