摘要
目的探讨缺氧诱导因子(HIF)-1α-诱导型一氧化氮合酶(iNOS)—一氧化氮(NO)信号通路在肺缺m再灌注损伤(LIRI)中的作用及其机制。方法选择200—250g的健康雄性SD大鼠40只,随机分为5组(n=8):假手术组(c组)、缺血再灌注组(I/R组)、缺血再灌注加■甲基乙二酰基甘氨酸(DMOG)处理组(DMOG组)、缺血再灌注加诱导型一氧化氮合酶(iNOS)抑制剂1400w处理组(1400w组)、缺血再灌注加DMOG和1400W处理组(DW组)。C组:仅行左侧开胸,不行缺血再灌注处理;I/R组:建立大鼠LIRI模型,夹闭左侧肺门,阻断60rain后,再灌注120rain;DMOG组和DW组:在动物模型建立前24h腹腔注射DMOG40me,/kg;l400W组和DW组存实验开始麻醉后即刻腹腔注射1400W 5mg/kg。实验结束后,留取各组大鼠左肺组织标本。严格按照试剂盒操作步骤检测肺组织HIF-1α蛋白表达,iNOS、eNOS和SOD活性,NO、丙二醛(MDA)和白细胞介素(IL)-8含量;计算肺组织湿/干重之比(W/D)。结果(1)与C组比较,I/R、DMOG、1400W和Dw组HIF-1α蛋白表达(154.61±6.56、138.23±10.81、151.68±9.65、136.35±5.78比178.72±8.34)增加,eNOS活性[(0.35±0.09)、(0.32±0.10)、(0.50±0.13)、(0.49±0.15)比(0.58±0.12)U/mg·蛋白]降低;I/R组和DMOG组iNOS活性[(0.91±0.27)、(1.15±0.32)比(0.41±0.13)U/mg·蛋白]和NO含量[(0.87±0.18)、(1.03±0.16)比(0.44±0.09)μmol/L]增加(P〈0.05)。(2)与I/R组比较,DMOG组和DW组HIF-1α蛋白表达(138.23±10.81、136.35±5.78比154.61±6.56)增加;1400W组和DW组iNOS活性[(0.39±0.11)、(0.42±0.12)比(0.91±0.27)U/mg·蛋白]和NO含量[(0.41±0.11)、(0.40±0.08)比(0.87±0.18)μmol/L]降低,eNOS活性[(0.50±0.13)、(0.49±0�
Objective To investigate the role of hypoxia inducible factor (HIF) -1α- inducible nitric oxide synthase (iNOS) - nitric oxide (NO) signal pathway in lung ischemia - reperfusion (l/R) injury and the underlying mechanisms. Methods A total of 40 male Sprague -Dawley rats (200 -250 g) were randomly divided into control (C group), I/R group, I/R plus HIF- lct stablilizer DMOG (DMOG group) , I/R plus iNOS inhibitor 1 400 W (1 400 W group) and I/R plus DMOG and 1 400 W group ( DW group) (n = 8 each). Animals in DMOG group and DW group were given an intraperitoneal injection of I)MOG (40 mg/kg in 1 ml saline). Animals in 1 400 W group and DW group were given an intraperito- neal injection of 1 400 W(5 mg/kg in 1 ml saline) after anesthesia. At the end of the experiment, the left lung was harvested. The protein expression of HIF -1α, the activity of iNOS, eNOS and superoxide dismutase (SOD), and the levels of NO, malondialdehyde (MDA) and interleukin (IL) -8 were detected. Results ( 1 ) As compared with C group, the protein expression levels of HIF -1α in I/R group, DMOG group, 1 400 W group, and DW group ( 154. 61 ± 6.56, 138. 23 ± 10. 81, 151.68 ± 9. 65, 136. 35± 5.78 vs. 178. 72 ± 8.34) were increased, the activity of eNOS [ ( 0. 35 ± 0. 09 ), ( 0. 32 ± 0. 10 ), ( 0. 50 ±0. 13), (0. 49±0. 15) vs. (0. 58±0. 12) U/mg.prot] was decreased; the activity of iNOS in I/R group and DMOG group [ (0. 91 ±0. 27), ( 1.15 ±0. 32) vs. (0. 41 ±0. 13) U/mg-prot] and the level of NO (0.87±0.18), (1.03 ±0.16) vs. (0.44±0.09) μmol/L] were increased (P〈0.05). (2) As Compared with I/R group, the protein expression levels of HIF - let in DMOG group and DW group (138. 23 ±10. 81, 136. 35 ± 5.78 vs. 154. 61 ± 6. 56) were increased; the activity of iNOS in 1 400 W group and DW group [ ( 0. 39 ± 0. 11 ), (0. 42 ± 0. 12 ) vs. (0. 91 ± 0. 27 ) U/mg. prot ] and the level of NO [ (0
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2015年第8期1798-1801,共4页
Chinese Journal of Experimental Surgery
基金
山东省自然科学基金资助项目(ZR2012HL54、ZR2013HL022)
关键词
肺缺血
再灌注损伤
缺氧诱导因子-1Α
诱导型一氧化氮合酶
Lung ischemia
Reperfusion injury
Hypoxia inducible transcription factor -1α
Inducible nitric oxide synthase