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[Free radical generation in electron transport system of mitochondria after cold preservation in UW solution]
T Endoh1, N Ohkohchi, K Oikawa
1Second Department of Surgery, Tohoku University School of Medicine, Sendai, Japan.
Unlabelled:
In the liver transplantation one of the causes of primary graft nonfunction is likely associated with lipid peroxidation at reperfusion after cold preservation. In this study, we investigated whether free radicals produced in mitochondrial electron transport system would result in lipid peroxidation after cold preservation in UW solution.
Materials And Methods:
Under anesthesia, the liver of male Wistar rat was flushed via the portal vein with cold Ringer lactate, and then placed in 4 degrees C UW solution for 24 hr. After cold preservation, we examined mitochondrial respiratory control ratio (RCR), free radicals (O2-) from mitochondrial electron transport system by MCLA induced chemiluminescence, and lipid peroxidation by chemiluminescence (CL) after reoxygenation.
Results:
RCR gradually decreased up to 24 hr preservation. O2- generation from mitochondrial electron transport system was not recognized at any length of the time after cold preservation up to 24 hr. At 6 hr, CL values were slightly higher than those of the control, but significantly decreased at 24 hr.
Conclusion:
O2(-)-generated in electron transport system of mitochondria did not increase with cold preservation up to 24 hr, therefore, the radical from mitochondria did not cause a lipid peroxidation at reperfusion injury.