国际麻醉学与复苏杂志   2013, Issue (10): 8-8
    
小剂量氯胺酮预处理对大鼠肠缺血/再灌注后 肝脏血红素加氧酶-1表达的影响
张凌云, 薛建军, 冷玉芳, 张国欣1()
1.甘肃省中医院麻醉科
Effect of low-dose ketamine preconditioning on the expression of heme-oxygenase-1 in the liver after intestinal ischemia/reperfusion injury in rats
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摘要:

目的 观察小剂量氯胺酮对血红素加氧酶-1(heme-oxygenase 1, HO-1)在大鼠肠缺血/再灌注(ischemia/reperfusion, I/R)后肝脏中表达的影响,并对其可能的保护机制作一初步探讨。 方法 48只雄性成年SD大鼠按随机数字表法分为A组(氯胺酮10 mg/kg术前30 min腹腔注射+假手术)、B组(盐水0.2 ml术前30 min腹腔注射+假手术)、C组(氯胺酮10 mg/kg术前30 min腹腔注射+小肠I/R)、D组(盐水0.2 ml术前30 min腹腔注射+小肠I/R)、E组(锌原卟啉5 mg/kg、氯胺酮10 mg/kg术前30 min腹腔注射+小肠I/R)、F组(锌原卟啉5 mg/kg、盐水0.2 ml术前30 min腹腔注射+小肠I/R),每组8只。小肠I/R造模组大鼠通过夹闭肠系膜上动脉60 min,然后松血管夹,于再灌注6 h后取材,测定肝组织丙二醛(malondialdehyde, MDA)含量、超氧化物歧化酶(superoxide dismutase, SOD)活性;采用免疫组化法测定肝组织HO?蛳1的表达和定量;光镜下观察肝脏病理学改变;取外周静脉血测血清谷丙转氨酶(glutamic-pyruvic transaminase, GPT)、谷草转氨酶(glutamic-oxaloacetic transaminase, GOT)。 结果 A、B两组间各项数据比较差异无统计学意义 (P>0.05);各缺血造模组大鼠肝组织MDA含量:C组[(2.69±0.35) μmol/g]、D组[(4.62±0.36) μmol/g]、E组[(4.35±0.24) μmol/g]、F组[(4.74±0.34) μmol/g]与B组[(1.08±0.26) μmol/g]比较,显著升高;SOD活力:C组[(129±6) μU/L]、D组[(102±5) μU/L]、E组[(99±4) μU/L]、F组[(96±6) μU/L]与B组[(133±7) μU/L]比较,显著下降;血清GOT、GPT含量:C组[GPT(212±21) U/L,GOT(129±16) U/L]、D组[GPT(416±33) U/L,GOT(362±15) U/L]、E组[GPT(407±29) U/L,GOT(359±14) U/L]、F组[GPT(414±40) U/L,GOT(366±16) U/L]与B组[(GPT(53±9) U/L,GOT(83±7) U/L]比较,显著升高; HO-1表达:C组(0.472±0.126)、D组(0.324±0.078)、E组(0.337±0.092)、F组(0.328±0.083) OD与B组(0.078±0.010) OD比较,显著上调(P<0.05或P<0.01);与D组比较,C组血清GPT、GOT、肝组织MDA含量均显著降低,SOD活力显著上升,HO-1表达上调 (P<0.05);与D组比较,E组、F组血清GPT、GOT及MDA、SOD值差异无统计学意义 (P>0.05);E组和C组比较,血清GPT、GOT,肝组织MDA含量显著升高,SOD活力显著下降,HO-1表达下调(P<0.05)。 结论 小剂量氯胺酮预处理能减轻肠I/R后造成的肝脏损伤,这种作用在一定程度上是通过上调HO-1的表达来实现的。

关键词: 小剂量氯胺酮预处理; 肠缺血再灌注;肝脏损伤; 血红素加氧酶-1
Abstract:

Objective To investigate the potential protective effect of ketamine on liver in rats with intestinal ischemia/reperfusion(I/R) and the mechanism related to heme-oxygenase-1(HO-1) protein expression. Methods 48 male rats were randomly divided into group A(ketamine 10 mg/kg ip given 30 min before shame), group B(saline 0.2 ml ip given 30 min before shame), group C(ketamine 10 mg/kg ip given 30 min before I/R), group D(saline 0.2 ml ip given 30 min before I/R), group E (ZnPPⅨ 5 mg/kg and ketamine 10 mg/kg ip given 30 min before I/R) and group F(ZnPPⅨ 5 mg/kg and saline 0.2 ml ip given 30 min before I/R), with 8 rats in each group. The rat model of intestinal I/R injury was reproduced by occluding the superior mesenteric artery for 1 h and subsequent reperfusing for 6 h. Tissues were gathered for malondialdehyde(MDA) and superoxide dismutase(SOD) determination at various intervals. Expression and distributions of HO?蛳1 in heptic tissue were detected by inmunohistochemistry and morphometry computer image analysis. The pathological changes of livers were observed under lightmicroscope, The changes of serum glutamic?蛳oxaloacetic transaminase (GOT) and glutamic-pyruvic transaminase(GPT) were observed respectively. Results There was no significant difference between group A and group B in all results; Compared with group B[MDA(1.08±0.26) μmol/g, SOD(133±7) μU/L, GPT(53±9) U/L,GOT(83±7) U/L,HO?蛳1(0.078±0.010) OD], expresssion of HO-1 markedly increased, the content of MDA and serum GOT and GPT were obviously higher, and the activity of SOD was lower in all I/R groups(P<0.01 or P<0.05) {MDA: group C(2.69±0.35) μmol/g,group D(4.62±0.36) μmol/g,group E(4.35±0.24) μmol/g,group F(4.74±0.34) μmol/g; SOD: group C(129±6) μU/L,group D(102±5) μU/L,group E(99±4) μU/L,group F(96±6) μU/L; group C[GPT(212±21) U/L,GOT(129±16) U/L],group D[GPT(416±33) U/L,GOT(362±15) U/L],group E[GPT(407±29) U/L,GOT(359±14) U/L],group F[GPT(414±40) U/L,GOT(366±16) U/L];HO-1: group C(0.472±0.126),group D(0.324±0.078),group E(0.337±0.092),group F(0.328±0.083) OD}. The expression of HO-1 in group C was obviously higher than that in group D(P<0.05). The pathological changes under light microscope induced by I/R were significantly attenuated by ketamine in group C than that in group D and were reversed by Znic protoporphorin Ⅸ in group E. Conclusions Low-dose ketamine inhibits hepatic tissue injury during intestinal ischemia/reperfusion. This potential protective effect may be partly achieved by induction of HO-1.

Key words: low-dose ketamine preconditioning; intestinal ischemia/reperfusion; livers injury; heme-oxygenase 1