摘要
目的观察小肠远端缺血预处理对大鼠肝脏热缺血再灌注损伤的保护作用。方法将40只Wistar大鼠被随机分为4组:假手术组(Sham)、单纯远端缺血预处理组(RIPC)、单纯缺血再灌注组(IR)和远端缺血预处理±缺血再灌注组(RIPC±IR)。远端缺血预处理方式采用于小肠系膜根部游离动脉血管并夹闭5min后开放5min,反复3次。缺血再灌注模型采用于肝蒂阻断肝脏供血45min,阻断范围占整个肝脏的70%,开放复流3h。检测血液中谷丙转氨酶(ALT)、乳酸脱氢酶(LDH)、一氧化氮(NO)和内皮素(ET)、肝脏苏木素-伊红(HE)病理、心血管指标。结果复流3h后,RIPC±IR组的ALT、LDH、心血管指标[平均动脉衄压(MAP)、外周帆氧饱和度(SaO2)]为(434.265-133.42)U/L、(2536±181)U/L、(83.1±7.3)mmHg(1mmHg=0.133kPa)和(97.4±0.5)%,明显好于IR组(953.64±114.12)U/L、(5734±296)U/L、(67.1±7.4)mmHg和(93.1±0.6)%(P〈0.05)。RIPC±IR组肝脏HE病理改变程度比IR组小。门静脉中IR组血清NO浓度(15.54±2.34)μmol/L低于RIPC±IR组(18.10±1.82)μmot/L(P〈0.05),外周血中,IR组血浆ET浓度(672.4±63.1)ng/L高于RIPC±IR组(451.7±63.6)ng/L(P〈0.05),门静脉中IR组血清ET浓度(612.5±48.2)ng/L高于RIPC±IR组(401.5±51.2)ng/L(P〈0.05)。结论小肠RIPC可以减轻肝脏缺血再灌注损伤,具有简便、易操作的特点,NO及ET可能在其中发挥了重要作用。
Objective To observe the protective effective of remote small intestinal ischaemic pre- conditioning ( RIPC ) on liver warm ischemia-reperfusion injury (IRI) in rats. Methods Fourty male rats were allocated to four groups: sham operated, RIPC alone, IRI alone, and RIPC plus IRI. RIPC was in- duced in small intestine with a vascular clip, before liver IRI, by three alternate cycles of 5 rain isehaemia followed by 5 min reperfusion. Liver IRI was produced by 70% inflow occlusion for 45 rain, open-reflow 3 h. Blood alanine aminotransferase (ALT) , lactate dehydrogenase (LDH) , nitric oxide (NO) and endothelin (ET) levels were determined, liver pathological changes were observed by HE staining, and mean arterial pressure (MAP), SaO2. Results Three h after reflow, ALT and LDH levels, MAP, SaO2 in RIPC + IR group were (434.26 ± 133.42) U/L, (2536 ± 181) U/L, (83. 1 ±7.3) mmHg (1 mm Hg = 0. 133 kPa) and (97.4 ±0.5)%, significantly increased (P 〈0.05) as compared with the IR group [(953.64±114. 12) U/L, (5734 ±296) U/L, (67.1 ±7.4) mmHg and (93.1 ±0.6)% respective- ly ]. The liver pathological changes in RIPC ± IR group alleviated as compared with the IR group. Serum NO concentration in the IR group [ ( 15.54 ±2. 34) μmol/L1 was lower than in RIPC ± IR group [ ( 18. 10 ± 1.82) μmol/L] in the portal vein blood (P 〈0. 05). In peripheral blood, plasma ET concentration in IR group was (672. 4 ±63.1 ) ng/L, higher than in RIPC + IR group [ (451.7 ±63.6) ng/L, (P 〈0. 05) ] , and so did in portal vein blood [ IR group: (612. 5 ± 48.2) ng/L, RIPC + IR group: (401.5 ± 51.2) ng/L]. Conclusion Small intestinal RIPC can reduce the hepatic isehemia-reperfusion injury. NO and ET may play an important role in the protection.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2010年第5期591-593,共3页
Chinese Journal of Experimental Surgery
关键词
缺血再灌注
远端缺血预处理
肝脏
小肠
lsehaemia-repeffusion injury
Remote isehaemie preconditioning
Liver
Small intestine