[Effects of aminoguanidine on the lung injury induced by the total hepatic ischemia-reperfusion in rats].
OBJECTIVE
To investigate the effects of aminoguanidine on the lung injury induced by the total hepatic ischemia-reperfusion in rats.


METHODS
The total hepatic ischemia-reperfusion model was built after blocking of the hepatic porta, suprahepatic and infrahepatic vena cava. Ninety Sprague-Dawley rats were assigned randomly into 3 groups: Sham operation group (Group A, n=30); total hepatic ischemia group (Group B, n=30); and aminoguanidine treatment group (Group C, n=30). Each group was subdivided randomly into 3 subgroups (n=10) according to different time phases: 20 minutes after the total hepatic vascular exclusion (T0), 4 hours after the reperfusion (T1), and 48 hours after the survival Group A and Group B were intravenously injected with normal saline ( mL/kg) while Group C was injected with aminoguanidine (20 mg/kg) dissolved in normal saline (1 mL/kg) 10 minutes before the open of the abdomin. The levels of portal blood nitric oxide ( O) endotoxin ( ET), tumor necrosis factor-alpha (TNF-alpha at T0 and T1 were detected; 48 hours survival rates and the lung wet/dry weight ratio were counted; and the histological changes of the lung tissues were observed.


RESULTS
Compared with Group A, the levels of portal vein NO, ET, and TNF-alpha T0 and T1 in Group B and Group C were significantly higher (P < 0.05 or P < 0.01). But those indexes of Group C were lower than those of Group B (P < 0.05). The 48-hour survival rate in Group C was higher than that in Group B (P < 0.05). The lung wet/dry weight ratio in Group C was lower than in Group B (P < 0.05) and the histological change of Group C was slighter than that in Group B.


CONCLUSIONS
Aminoguanidine has the protective effects on the lungs against the total hepatic ischemia-reperfusion induced injury.
Department of Anesthesiology, Second Xiangya Hospital, Central South University, Changsha 410011, China. caodequan989@hotmail.com
De-quan
DQ
Cao
Yan-ping
YP
Chen
Ye-tian
YT
Chang
Yong-guo
YG
Li
D000818:Animals; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D006146:Guanidines / Q000494:pharmacology*; D008099:Liver / Q000098:blood supply*; D008297:Male; D052247:Nitric Oxide Synthase Type II / Q000037:antagonists & inhibitors*; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000517:prevention & control*; D012128:Respiratory Distress Syndrome / Q000517:prevention & control*
D004791:Enzyme Inhibitors; D006146:Guanidines; D052247:Nitric Oxide Synthase Type II; C004479:pimagedine