摘要:
Objective To investigate whether intravenous injected sodium hydrosulfide (NaHiS) could alleviate the fatty liver ischemia-reperfusion injury in rats and the mechanism.Methods 30 healthy male Sprague-Dawley (SD) rats were fed with high fat diet for 4 weeks then divided into five groups randomly,sham operation group (S group),ischemia-reperfusion group (IR group) and different doses of sodium hydrosulfide groups (NaHS 1-3 groups).In S group hepatic portal was only exposed but not ligated.In IR group the left and middle lobes of hepatic portal vein and hepatic artery were clamped for 1 h and then reperfused.NaHS 1-3 groups received intravenous of NaHS 14,28,56 μmol/kg 5 min before reperfusion.Blood samples were collected for measuring the level of alanine transaminase (ALT) in serum at 6 h after reperfusion.Liver tissue samples were collected for measurement the content of malondialdehyde (MDA) and the activity of superoxide dismutase (SOD) and pathologic examination.Results The level of ALT in serum of S group,IR group and NaHS 1-3 group were (64 ± 8),(1 393 ± 69),(852 ±53),(823 ±42),(807 ±57) U/L respectively;The content of MDA in liver tissue of S group,IR group and NaHS 1-3 group were (2.15 ±0.24),(7.97 ±0.42),(5.26 ±0.34),(4.95 ±0.42),(4.77 ± 0.40) nmol/mg prot respectively;the activity of SOD in liver tissue were (421 ± 20),(201 ± 32),(517 ±27),(601 ±23),(607 ±30) U/mg prot respectively.Compared with S group,the level of ALT in serum and MDA content in liver tissue were increased in IR group (t =44.194,P =0.000;t =42.068,P =0.000),and the activity of SOD in liver tissue was decreased in IR group (t =-14.658,P =0.000).Compared with IR group,the level of ALT in serum were decreased in NaHS 1-3 group (t =-11.563,P=0.000;t=-36.415,P=0.000;t=-13.372,P=0.000),and the content MDA in liver tissue were decreased in NaHS 1-3 group (t =-10.375,P =0.000;t =-17.532,P =0.000;t =-12.402,P =0.000),the activity of SOD in liver tissue was increased in NaHS 1-3 group (t =24.087,P =0.000;t =30.451,P =0.000;t =42.542,P =0.000).The pathological damage degree was lighter in NaHS 1-3 group (Suzuki's score 2.50,2.33,2.17) than IR group (Suzuki's score 3.67) (t=3.873,P=0.012;t=6.325,P=0.001;t=11.608,P=0.000).Conclusion Intravenous injected sodium hydrosulfide can reduce fatty liver ischemia-reperfusion injury in rats through the inhibition of lipid peroxidation.%目的 探讨静脉注射硫氢化钠是否可减轻大鼠脂肪肝缺血再灌注损伤及机制.方法 健康雄性SD大鼠30只,高脂饮食4周后形成脂肪肝,将其随机分为假手术组(S组)、缺血再灌注组(IR组)和不同剂量硫氢化钠组(NaHS 1 ~3组).S组仅暴露肝门,不夹闭动、静脉;IR组采用夹闭左叶及中叶门静脉和肝动脉分支1h后恢复灌注的方法制备大鼠脂肪肝缺血再灌注模型;NaHS1~3组于再灌注前5 min分别经股静脉注射14、28、42 μmol/kg硫氢化钠,于再灌注6h时抽取下腔静脉血样并取左肝组织,测定血清丙氨酸转氨酶(ALT)水平,并测定肝组织中丙二醛(MDA)含量及超氧化物歧化酶(SOD)活力,苏木素-伊红(HE)染色后观察肝组织病理学结果.结果 S、IR、NaHS1~3组血清ALT水平分别为(64±8)、(1 393±69)、(852 ±53)、(823 ±42)、(807±57) U/L;S、IR、NaHS 1 ~3组肝组织MDA水平分别为(2.15±0.24)、(7.97±0.42)、(5.26±0.34)、(4.95±0.42)、(4.77 ±0.40) nmol/mg蛋白;S、IR、NaHS 1 ~3组肝组织SOD活性分别为(421±20)、(201±32)、(517 ±27)、(601±23)、(607 ±30) U/mg蛋白;IR组血清ALT水平及肝组织MDA含量均显著高于S组(t=44.194,P=0.000;t=42.068,P=0.000),SOD活力显著低于S组(t=-14.658,P=0.000);NaHS 1 ~3组ALT水平均显著低于IR组(t=-11.563,P=0.000;t-36.415,P=0.000;t=-13.372,P=0.000),NaHS 1 ~3组肝组织MDA含量均显著低于IR组(t=-10.375,P=0.000;t=-17.532,P=0.000;t-12.402,P=0.000),SOD活力显著高于IR组(t=24.087,P=0.000;=30.451,P=0.000;t =42.542,P=0.000);NaHS 1~3组(Suzuki's评分2.50、2.33、2.17分)肝病理学损伤较IR组(Suzuki's评分3.67分)明显减轻(t=3.873,P=0.012;t =6.325,P=0.001;t=11.608,P=0.000).结论 静脉注射硫氢化钠可通过抑制脂质过氧化而减轻大鼠脂肪肝缺血再灌注损伤.