神经节苷脂有髓损伤的保护作用观察

目的：观察神经节苷脂对损伤脊髓神经组织的保护作用,并初步探讨其作用机制。方法：重度脊髓损伤大鼠随机分为对照组及神经节苷脂治疗组（n=15)。在蛛网膜下腔注射生理盐水20μl或神经节苷脂30μg。观察体重变化局部血流量、凋亡细胞原位标记、神经功能评价和定量组织学分析。结果：局部血流量2组无明显差异,治疗组存活8率、体重、神经功能评分和残余神经组织面积明显高于对照组,而TUNEL阳性细胞数量明显低于对照组。结论：神经节苷脂对损伤脊髓组织有明显保护作用,可能是通过对神经细胞凋亡的阻断来发挥作用的。     

外源性神经节苷脂对大鼠脊髓损伤的保护作用

目的 :探讨外源性神经节苷脂 (GM1)对大鼠脊髓损伤后继发性损害的保护作用。方法 :用Allen’sWD技术制备脊髓损伤模型 ,96只大鼠随机分为 :假手术组、对照组和实验组 ,于损伤平面以下蛛网膜下腔置细塑料导管 ,实验组术后15min经导管注入GM1溶液 ,对照组注入等量生理盐水。用药后不同时间测定脊髓组织超氧化物歧化酶 (SOD)活性、丙二醛(MDA)浓度和兴奋性氨基酸 (EAA)的含量。伤后 2、 4周联合行为学评分 (CBS)观察实验动物神经功能恢复情况。结果 :脊髓损伤后用GM1组 ,损伤脊髓组织MDA浓度和EAA含量明显降低 ,而SOD活性则显著升高。CBS评分明显降低。结论 :外源性GM1可拮抗脊髓损伤后的脂质过氧化反应 ,降低兴奋性氨基酸的毒性 ,从而发挥保护脊髓作用     

神经节苷脂促进神经再生的研究进展

神经节苷脂促进神经再生的研究进展王民生综述陈中伟，张光健审校神经节苷脂（Ｇａｎｇｌｉｏｓｉｄｅ）是含唾液酸的一类膜糖脂的总称，最早发现于本世纪三十年代，六十年代后才引起越来越多神经生物学家的重视，成为涉及神经生化、细胞药理、生理、发育等许多专业的热门...     

神经节苷脂治疗重型颅脑损伤临床研究

目的:探讨神经节苷脂在重型颅脑损伤治疗中的作用。方法:选择我院收治的重型颅脑损伤患者62例,分为常规组和神经节苷脂组。分析比较昏迷时间、死亡率、GOS等神经功能指标。结果:神经节苷脂组昏迷时间和GOS明显优于常规组,死亡率低。结论:神经节苷脂可缩短重型颅脑损伤患者的昏迷时间,有助于降低其死亡率和致残率,是值得推广的一种神经保护剂。     

神经节苷脂治疗中枢神经系统创伤

本文就外源性神经节苷脂在治疗中枢神经系统创伤中的作用作一综述。     

单唾液酸神经节苷脂在脊髓损伤中的应用

九十年代以前，脊髓损伤的治疗主要为：（1）通过外科治疗达到脊柱骨折的复位和重建脊柱稳定性，以预防脊髓的再次损伤和限制脊髓继发性损害；（2）通过外科手术减压以利于脊髓残存功能的恢复；（3）通过各种临床治疗与护理措施，预防和治疗各种脊髓损伤的并发症；（4）通过早期强化的康复手段以改善和增强患者的残存功能和能力[1-4]。但是，尚无直接有效的治疗方法预防脊髓损伤后脊髓内发生的一系列病理改变和使其产生逆转，即对脊髓损伤本身尚无有效的治疗方法。长期以来，脊髓损伤作为世界医学界尚未解决的重大课题之一受到各国专家的关…     

神经节苷脂治疗弥漫性轴索损伤的临床观察

目的观察应用神经节苷脂治疗弥漫性轴索损伤(DAI)的临床疗效。方法将DAI患者60例随机分成观察组和对照组两组,每组各30例。对照组患者予保持呼吸道通畅、降低颅内压、改善微循环、早期冬眠治疗等常规治疗。观察组在常规治疗的基础上配合神经节苷脂药物治疗,观察两组的疗效及并发症发生情况。结果观察组患者恢复良好率明显高于对照组,病死率明显低于对照组,两组对比,差异有统计学意义(P0.05)。两组患者的并发症情况对比,差异无统计学意义(P0.05)。结论对DAI患者应用神经节苷脂可积极改善脑功能作用,且不增加并发症发生率,疗效肯定。     

不同剂量神经节苷脂治疗急性脊髓损伤的临床观察

目的观察不同剂量的神经节苷脂(GM1)对脊髓损伤患者的疗效。方法57例脊髓损伤患者随机分为3组,GM1大剂量治疗组16例,每日给予GM1100mg+生理盐水100ml静脉注射,15d为1个疗程,休息7d,再行第2个疗程,用药剂量同第1个疗程。GM1小剂量组23例,每日给予GM140mg+生理盐水100ml静脉注射,15d为1个疗程,休息7d,再行第2个疗程,用药剂量同第1个疗程。GM1小剂量组23例,每日给予GM140mg+生理盐水100ml静脉注射,15d为1个疗程,休息7d,再行第2个疗程,用药量同第1个疗程。常规组18例:术后仅予常规治疗。结果GM1组治疗后脊髓功能总体进步与常规组无差别,但其截瘫的Frankle二级恢复率及有用恢复率明显高于常规组,而GM1大剂量组的治疗效果好于小剂量组。结论脊髓损伤患者GM1大剂量组的治疗效果好于小剂量组与常规组。     

单唾液酸神经节苷脂(GM-1)对脊柱脊髓损伤疗效回顾性分析

目的通过对比对急性脊髓损伤患者使用和不使用GM-1的疗效,研究GM-1对急性脊髓损伤的疗效。方法回顾性分析本院2003年以来92例急性脊髓损伤病例,其中分为使用及不使用GM-1,通过对比浅感觉,运动及小便功能诸方面来研究GM-1对急性脊髓损伤的疗效。结果浅感觉,运动及小便功能等方面功能恢复程度的对比均有P0.05,差异有统计学意义。结论GM-1对急性脊髓损伤的功能恢复有促进作用。     

七氟醚对大鼠局灶性脑缺血再灌注损伤的保护作用

目的评价七氟醚对大鼠局灶性脑缺血再灌注损伤的保护作用及其机制。方法雄性SD大鼠24只，随机分为假手术组、损伤组、七氟醚组，每组8只。采用大脑中动脉线栓法阻断前脑血供3h、再灌注24h制备大鼠局灶性脑缺血再灌注损伤模型。七氟醚组于再灌注前30min经面罩吸入七氟醚（呼气末浓度维持1．0MAC，持续30min）。再灌注24h时用Zea Longa评分法进行神经功能缺陷评分，并测定体重。再灌注24h时用原位末端脱氧核苷酸转移酶标记法测定纹状体神经细胞凋亡，计算神经细胞凋亡密度，并用免疫组织化学法测定纹状体PKCγ蛋白的表达。结果与缺血前比较，再灌注24h时损伤组体重减轻（P〈0．01）；与假手术组比较，再灌注24h时损伤组和七氟醚组神经功能缺陷评分及神经细胞凋亡密度增加，七氟醚组纹状体PKCγ表达降低；与损伤组比较，七氟醚组神经功能缺陷评分、纹状体神经细胞凋亡密度降低，PKCγ表达增加（P〈0．05或0．01）。结论吸入1．0MAC七氟醚对大鼠局灶性脑缺血再灌注损伤产生保护作用，其机制与上调纹状体PKCγ蛋白表达有关。     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.     

Protective effect of ischemic postconditioning on lung ischemia-reperfusion injury in rats and the role of heme oxygenase-1

To investigate the effect of ischemic postconditioning (IPO) on acute lung ischemia-reperfusion (I/R) injury and the protein expression of haeme oxygenase-1 (H0-1), a cytoprotective defense against oxidative injury. Methods: After being anesthetized with chloralhy-drate, forty-eight healthy SD rats were randomly divided into 6 groups (8 in each): sham operation group (S group); I/R group: left lung hilum was clamped for 40 minutes followed by 105 minutes of reperfusion; IPO group: left lung hilum was clamped for40 minutes and postconditioned by 3 cycles of 30 seconds of reperfusion and 30 seconds of reocclusion; Hemin (HM)+ I/R group: hemin, an inducer of HO- 1 was injected intraperitoneally at 40 μmol.kg-1·day-1 for two con-secutive days prior to 40 minutes clamping of left lung hilum; ZnPPIX+IPO group: zinc protoporphyrin Ⅸ, an inhibitor of HO-1 was injected intraperitoneally at 20 mg·kg-1 24 hours prior to 40 minutes clamping of left lung hilum; and HM+S group: HM was administered as in the HM+I/R group without inducing lung I/R. Arterial partial pressure of oxygen (PaO2) and malondialdehyde (MDA) content in serum were assessed. The left lung was removed for determination of wet/dry lung weight ratio and expression of HO-1 protein by immuno-his-tochemical technique and for light microscopic examination. Results: The PaO2 was significantly lower in all the experimental groups compared with sham group (90 mm Hg ±11 mm Hg). However, the values ofPaO2 in IPO (81 mm Hg ±7 mm Hg) and HM+I/R (80 mm Hg±9 mm Hg) were higher than that in I/R (63 mm Hg±9 mm Hg) and ZnPPIX+IPO (65 mm Hg±8 mm Hg) groups (P<0.01). The protein expression of HO-1 in lung tissue was significantly increased in I/R group compared with S group (P<0.01). While the HO-1 protein expression was higher in IPO and HM+I/R groups as compared with I/R group (P<0.05, P<0.01). The lung wet/ dry (W/D) weight ratio and MDA content in serum were significantly increased in I/R group as compared with S or HM+S groups (P<0.01), accompanied by severe lung tissue histological damage, which was attenuated either by IPO or by HM pretreatment (P<0.01, IPO or HM+I/R vs. I/R). The protective effect of IPO was abolished by ZnPPIX. Condusion: Ischemic postconditioning can attenuate the lung ischemia-reperfusion injury through upregulating the protein expression of HO-1 that leads to reduced post-ischemic oxidative damage.