Lee WY, Lee JS, Lee SM. Protective effects of combined ischemic preconditioning and ascorbic acid on mitochondrial injury in hepatic ischemia/reperfusion.
J Surg Res 2007;
142:45-52. [PMID:
17559880 DOI:
10.1016/j.jss.2006.08.043]
[Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2006] [Revised: 07/25/2006] [Accepted: 08/09/2006] [Indexed: 11/23/2022]
Abstract
BACKGROUND
This study examined the in vivo effects of ischemic preconditioning (IPC), ascorbic acid (AA), or a combination (IPC + AA) on the level of mitochondrial injury caused by hepatic ischemia/reperfusion (I/R).
MATERIALS AND METHODS
A rat liver was preconditioned with 10 min of ischemia followed by 10 min of reperfusion, and then subjected to 90 min of ischemia followed by 5 h of reperfusion. The rats were pretreated with AA (100 mg/kg, i.v.) 5 min before the sustained ischemia.
RESULTS
I/R increased the aminotransferase activity and level of mitochondrial lipid peroxidation, whereas it decreased the reduced glutathione:oxidized glutathione ratio. Either the IPC or AA pretreatment alone attenuated these changes, with the effect being enhanced by IPC + AA. The level of mitochondrial glutamate dehydrogenase, which is specifically located in the matrix, decreased after I/R but this was prevented by IPC + AA. Significant peroxide production was observed after 10 min of reperfusion after sustained ischemia. This change was attenuated by either IPC or AA alone and was further attenuated by IPC + AA. The mitochondria isolated after I/R were rapidly swollen, indicating an opening of the permeability transition pore. However, this was markedly reduced by IPC + AA. The hepatic ATP level was lower after I/R, which was restored by IPC alone and IPC + AA.
CONCLUSIONS
Our findings suggest that IPC and AA synergistically reduce the level of mitochondrial damage during I/R as a result of decreased postischemic oxidant stress.
Collapse