L-N6-(1-亚氨乙基)赖氨酸对大鼠移植肺缺血再灌注损伤的影响

目的 探讨L-N6-(1-亚氨乙基)赖氨酸(L-NIL)对大鼠移植肺缺血再灌注损伤的影响.方法 清洁级雄性SD大鼠18只,体重250～350 g,随机分为3组(n=6),假手术组(S组);肺移植组(L组)肺移植后恢复再灌注,冷缺血时间约1 h;L-NIL组再灌注即刻经尾静脉输注L-NIL 3 mg/kg.各组均于再灌注即刻经尾静脉注射0.5%伊文氏蓝0.2 ml.再灌注2 h时取左肺组织,测定肺湿/干重(W/D)比、伊文氏蓝含量、MDA含量、髓过氧化物酶(MPO)、诱导型一氧化氮合酶(iNOS)及内皮源性一氧化氮合酶(eNOS)活性;并行病理学观察.结果 与S组比较,L组肺组织W/D比和伊文氏蓝含量增加,MDA含量、MPO及iNOS活性升高,eNOS活性降低(P＜0.05).与L组比较,L-NIL组肺组织W/D比和伊文氏蓝含量减少,MDA含量、MPO及iNOS活性降低,eNOS活性升高(P＜0.05),肺组织毛细血管内充血减少,炎性细胞浸润减少.结论 再灌注早期静脉注射L-NIL可减轻大鼠移植肺缺血再灌注损伤.

Effect of L-N6-(1-tminoethyl) Lysine on ischemia-reperfusion injury in a rat model of lung transplantation

Objective To investigate the effect of L-N6-(1-iminoethyl) Lysine(L-NIL) on ischemia-reperfusion (I/R) -induced lung injury in a rat model of lung transplantation. Methods Pathogen free male SD rats weighing 250-350g were used as donor and recipient rats in this study. The animals were randomly divided into 3groups (n = 6 each): sham operation group (group S); lung tratsplantation group (group L) and lung transplantation + L-NIL (selective iNOS inhibitor) group (group L-NIL). In group L and L-NIL orthotopic left lung allograft transplantation was performed. In group L-NIL 3 mg/kg was injected iv at the beginning of reperfusion. The donor lungs were removed from live donor rats and placed in Euro-collins solution at 4 ℃. The lung transplantation was performed under microscope and non-suture cuff technique was used. The implanted donor lungs were ventilated and reperfused. 0.5% Evans blue 0.2 ml was injected iv during reperfusion. The donor lungs were removed after being implanted, ventilated and reperfused for 2 h for microscopic examination and determination of iNOS, endothelial NOS (eNOS) and myeloperoxidase (MPO) activity and malondialdehyde (MDA) and Evans blue content in the lung tissue and W/D lung weight ratio. Results Lung transplantation significantly inceased W/D ratio, iNOS and MPO activity, and Evans blue and MDA content in the lung tissue and decreased eNOS activity in group L as compared with group S. L-NIL iv significantly attenuated the increase in the variables mentioned above and ameliorated capillary congestion and inflammatory cell infiltration in the lung. Conclusion Intravenous L-NIL administered at the beginning of reperfusion can reduce I/R injury to the transplanted donor lungs.