PMID: 8599272Jan 1, 1995Paper

Mitochondrial dysfunction in ischaemia-reperfusion

Acta Anaesthesiologica Scandinavica. Supplementum
N E Saris, K O Eriksson

Abstract

The mitochondrial dysfunction in ischaemia-reperfusion is shortly reviewed. During ischaemia the ATP level and pH drops, phospholipids are degraded, membrane permeabilities increased and the cytosolic levels of Na+ and Ca2+ raised. During the following reperfusion the Ca2+ levels may further increase while pH is raised. The oxidative phosphorylation is resumed and the ATP used for membrane repair and ion pumping. The mitochondrial Ca2+ handling is important in removing Ca2+ from the cytosol since the mitochondria are able to take up substantial amounts of Ca2+. However, if a certain threshold is exceeded, mitochondria undergo a so-called permeability transition (MPT), release their Ca2+, undergo swelling and become uncoupled. MPT has been shown to be due to the opening of large pore allowing passage of substances with a M(R) < 1500. Data are presented showing by electron microscopy swelling of mitochondria in cells in perfused liver before other gross morphological changes have taken place. There are a number of factors lowering the threshold for Ca2+ in inducing the MPT: inorganic phosphate, pro-oxidants that oxidize membrane SH-groups, oxidation of NAD(P)H and GSH, while a protective effect is exerted by Mg2+, ADP (and ATP), ...Continue Reading

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