BACKGROUND: Although the use of non-heart beating donors (NHBDs) could bridge the widening gap between organ demand and supply, its application to liver transplantation is limited due to the high incidence of primary ...BACKGROUND: Although the use of non-heart beating donors (NHBDs) could bridge the widening gap between organ demand and supply, its application to liver transplantation is limited due to the high incidence of primary graft loss. Prevention of liver injury in NHBDs will benefit the results of transplantation. This study was conducted to evaluate the protective effects of L-arginine on liver grafts from NHBDs. METHODS: One hundred and four Wistar rats were randomly divided into 7 groups: normal control (n=8) controls 1, 2 and 3 (C-1, C-2, C-3, n=16), and experimental 1, 2 and 3 (E-1, E-2, E-3, n=16). For groups C-1 and E-1, C-2 and E-2, and C-3 and E-3, the warm ischemia time was 0, 30, and 45 minutes, respectively. Liver grafts were flushed with and preserved in 4 degrees C Euro-collins solution containing 1 mmol/L L-arginine for 1 hour in each experimental group. Recipients of each experimental group were injected with L-arginine (10 mg/kg body weight) by tail vein 10 minutes before portal vein reperfusion. Donors and recipients of each experimental control group were treated with normal saline. Then transplantation was performed. At 1, 3, and 24 hours after portal vein reperfusion, blood samples were obtained to determine the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), nitric oxide (NO) and plasma endothelin (ET). At 3 hours after portal vein reperfusion, grafts samples were fixed in 2.5% glutaraldehyde for electron microscopic observation. RESULTS: At I hour after portal vein reperfusion, the levels of NO in groups E-1, E-2, E-3 and C-1, C-2, C-3 were lower, while the levels of plasma ET, serum ALT and AST were higher than those in the normal control group (P<0.05). At 1, 3, and 24 hours, the levels of NO in groups E-1, E-2, E-3 were higher, while the levels of plasma ET, serum ALT and AST were lower than those in the corresponding control groups (C-1, C-2, C-3) (P<0.05). The levels of NO in groups C-2 and C-3 were lower than in group C-1 (P<0.05), and the level of NO in group C-3 was lower than in group C-2 (P<0.05). At 1, 3 and 24 hours, the levels of plasma ET, serum ALT, and AST in groups E-1, E-2, E-3 were lower than those in the corresponding control groups (C-1, C-2, C-3) (P<0.05). The levels of plasma ET, serum ALT, and AST were lower in group C-3 than in groups C-1 and C-2 (P<0.05). Pathological changes in groups E-1, E-2, E-3 were milder than those in the corresponding experimental control groups (C-1, C-2, C-3). CONCLUSIONS: The imbalance between NO and ET plays an important role in the development of ischemia-reperfusion injury of liver grafts from NHBDs. L-arginine can attenuate injury in liver grafts from NHBDs by improving the balance between NO and ET.展开更多
目的 观察大鼠心肌缺血前给予含不同浓度的L-精氨酸和L-NAME的KH灌注液的心肌保护作用。方法 在心肌缺血前给予含不同浓度的L-精氨酸和L-NAME的KH灌注液,再灌注期间测定心脏功能指标及冠脉流出液中心肌酶释放量,观察心肌超微结构改变...目的 观察大鼠心肌缺血前给予含不同浓度的L-精氨酸和L-NAME的KH灌注液的心肌保护作用。方法 在心肌缺血前给予含不同浓度的L-精氨酸和L-NAME的KH灌注液,再灌注期间测定心脏功能指标及冠脉流出液中心肌酶释放量,观察心肌超微结构改变。结果 心肌缺血前给予含低浓度L-精氨酸的KH液(10 m m ol/L)灌注心脏,能明显减轻心肌缺血再灌注损伤,心肌缺血前给予含高浓度L-精氨酸的KH 液(100 m m ol/L)灌注心脏明显加重心肌缺血再灌注损伤,而给予含L-NAME的KH液无明显心肌保护或损害作用。结论 L-arg-NO 途径在心肌缺血再灌注损伤中有双重作用,既有有益一面,又有有害一面。展开更多
Objective\ To explore the protective effects of L arginine on myocardial ischemia reperfusion injury in patients undergoing extracorporeal circulation(ECC).\ Methods\ Sixteen patients undergoing open heart surgery wer...Objective\ To explore the protective effects of L arginine on myocardial ischemia reperfusion injury in patients undergoing extracorporeal circulation(ECC).\ Methods\ Sixteen patients undergoing open heart surgery were randomly divided into two groups:control group( n=8) and treated group( n=8) . Before aortic clamping and 2 hours, 4 hours, 8 hours after aortic off clamping, blood samples were taken to measure the levels of nitric oxide(NO), the activities of lactic dehydrogenase (LDH) and crentine phosphokinase (CPK).\ Results\ In control group NO level decreased remarkably ( P <0.05 or P<0.01) and LDH or CPK activity increased significantly ( P<0.01) at different time points after aortic off clamping as compared with that before aortic clamping; In treated group NO level did not decrease and activities of LDH and CPK increased slightly, and there were significant differences about parameters as above between control group and treated group ( P<0.05 and P<0 01) .\ Conclusion\ L arginine has notable protective effects on postischemia reperfusion myocardium during extracorporeal circulation which is due to its raising NO level.展开更多
基金a grant from the Science & Technology Development Foundation of Guangdong Health Bureau(No.2006345).
文摘BACKGROUND: Although the use of non-heart beating donors (NHBDs) could bridge the widening gap between organ demand and supply, its application to liver transplantation is limited due to the high incidence of primary graft loss. Prevention of liver injury in NHBDs will benefit the results of transplantation. This study was conducted to evaluate the protective effects of L-arginine on liver grafts from NHBDs. METHODS: One hundred and four Wistar rats were randomly divided into 7 groups: normal control (n=8) controls 1, 2 and 3 (C-1, C-2, C-3, n=16), and experimental 1, 2 and 3 (E-1, E-2, E-3, n=16). For groups C-1 and E-1, C-2 and E-2, and C-3 and E-3, the warm ischemia time was 0, 30, and 45 minutes, respectively. Liver grafts were flushed with and preserved in 4 degrees C Euro-collins solution containing 1 mmol/L L-arginine for 1 hour in each experimental group. Recipients of each experimental group were injected with L-arginine (10 mg/kg body weight) by tail vein 10 minutes before portal vein reperfusion. Donors and recipients of each experimental control group were treated with normal saline. Then transplantation was performed. At 1, 3, and 24 hours after portal vein reperfusion, blood samples were obtained to determine the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), nitric oxide (NO) and plasma endothelin (ET). At 3 hours after portal vein reperfusion, grafts samples were fixed in 2.5% glutaraldehyde for electron microscopic observation. RESULTS: At I hour after portal vein reperfusion, the levels of NO in groups E-1, E-2, E-3 and C-1, C-2, C-3 were lower, while the levels of plasma ET, serum ALT and AST were higher than those in the normal control group (P<0.05). At 1, 3, and 24 hours, the levels of NO in groups E-1, E-2, E-3 were higher, while the levels of plasma ET, serum ALT and AST were lower than those in the corresponding control groups (C-1, C-2, C-3) (P<0.05). The levels of NO in groups C-2 and C-3 were lower than in group C-1 (P<0.05), and the level of NO in group C-3 was lower than in group C-2 (P<0.05). At 1, 3 and 24 hours, the levels of plasma ET, serum ALT, and AST in groups E-1, E-2, E-3 were lower than those in the corresponding control groups (C-1, C-2, C-3) (P<0.05). The levels of plasma ET, serum ALT, and AST were lower in group C-3 than in groups C-1 and C-2 (P<0.05). Pathological changes in groups E-1, E-2, E-3 were milder than those in the corresponding experimental control groups (C-1, C-2, C-3). CONCLUSIONS: The imbalance between NO and ET plays an important role in the development of ischemia-reperfusion injury of liver grafts from NHBDs. L-arginine can attenuate injury in liver grafts from NHBDs by improving the balance between NO and ET.
文摘目的 观察大鼠心肌缺血前给予含不同浓度的L-精氨酸和L-NAME的KH灌注液的心肌保护作用。方法 在心肌缺血前给予含不同浓度的L-精氨酸和L-NAME的KH灌注液,再灌注期间测定心脏功能指标及冠脉流出液中心肌酶释放量,观察心肌超微结构改变。结果 心肌缺血前给予含低浓度L-精氨酸的KH液(10 m m ol/L)灌注心脏,能明显减轻心肌缺血再灌注损伤,心肌缺血前给予含高浓度L-精氨酸的KH 液(100 m m ol/L)灌注心脏明显加重心肌缺血再灌注损伤,而给予含L-NAME的KH液无明显心肌保护或损害作用。结论 L-arg-NO 途径在心肌缺血再灌注损伤中有双重作用,既有有益一面,又有有害一面。
文摘Objective\ To explore the protective effects of L arginine on myocardial ischemia reperfusion injury in patients undergoing extracorporeal circulation(ECC).\ Methods\ Sixteen patients undergoing open heart surgery were randomly divided into two groups:control group( n=8) and treated group( n=8) . Before aortic clamping and 2 hours, 4 hours, 8 hours after aortic off clamping, blood samples were taken to measure the levels of nitric oxide(NO), the activities of lactic dehydrogenase (LDH) and crentine phosphokinase (CPK).\ Results\ In control group NO level decreased remarkably ( P <0.05 or P<0.01) and LDH or CPK activity increased significantly ( P<0.01) at different time points after aortic off clamping as compared with that before aortic clamping; In treated group NO level did not decrease and activities of LDH and CPK increased slightly, and there were significant differences about parameters as above between control group and treated group ( P<0.05 and P<0 01) .\ Conclusion\ L arginine has notable protective effects on postischemia reperfusion myocardium during extracorporeal circulation which is due to its raising NO level.
