Abstract
Opening of a non-specific, high conductance permeability transition pore or megachannel in the inner mitochondrial membrane causes onset of the mitochondrial permeability transition, which is characterized by mitochondrial swelling, depolarization and uncoupling. Inducers of the permeability transition include Ca2+, oxidant stress and a permissive pH greater than 7.0. Blockers include cyclosporin A, trifluoperazine and pH < 7. Using laser scanning confocal microscopy, we developed techniques to visualize onset of the mitochondrial permeability transition in situ in living cells. In untreated cells, the permeability transition pore is continuously closed and does not ‘flicker’ open. By contrast, the pore opens in liver and heart cells after exposure to oxidant chemicals, calcium ionophore, hypoxia and ischemia/reperfusion, causing mitochondrial uncoupling and aggravation of ATP depletion. In injury to hepatocytes from tert-butylhydroperoxide, an analog of lipid hydroperoxides generated during oxidative stress, onset of the mitochondrial permeability transition is preceded by oxidation of mitochondrial pyridine nucleotides, mitochondrial generation of oxygen radicals and an increase of mitochondrial Ca2+, all inducers of the mitochondrial permeability transition. In ischemia, the acidosis of anaerobic metabolism protects strongly against cell death. During reperfusion, recovery of pH to normal levels is a stress that actually precipitates cell killing. Onset of the mitochondrial permeability transition may be responsible, in part, for this pH-dependent injury, or pH paradox. The mitochondrial permeability transition may also be responsible for a variety of pathological phenomena. In particular, the mitochondrial permeability transition may underlie Reye’s syndrome and Reye’s-like drug toxicities. In conclusion, multiple mechanisms contribute to cell injury after hypoxia, ischemia/reperfusion and toxic chemicals, but a common final pathway leading to acute cellular necrosis may be ATP depletion after mitochondrial failure. One important mechanism causing mitochondrial failure is the mitochondrial permeability transition, which both uncouples oxidative phosphorylation and accelerates ATP hydrolysis. Interventions that block this pH-dependent phenomenon protect against onset of cell death. (Mol Cell Biochem 174: 159–165, 1997)
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Lemasters, J.J., Nieminen, AL., Qian, T., Trost, L.C., Herman, B. (1997). The mitochondrial permeability transition in toxic, hypoxic and reperfusion injury. In: Gellerich, F.N., Zierz, S. (eds) Detection of Mitochondrial Diseases. Developments in Molecular and Cellular Biochemistry, vol 21. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6111-8_24
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DOI: https://doi.org/10.1007/978-1-4615-6111-8_24
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