Properties of the permeability transition in VDAC1(-/-) mitochondria

Biochimica Et Biophysica Acta
Alexandra KrauskopfPaolo Bernardi

Abstract

Opening of the permeability transition pore (PTP), a high-conductance mitochondrial channel, causes mitochondrial dysfunction with Ca2+ deregulation, ATP depletion, release of pyridine nucleotides and of mitochondrial apoptogenic proteins. Despite major efforts, the molecular nature of the PTP remains elusive. A compound library screening led to the identification of a novel high affinity PTP inhibitor (Ro 68-3400), which labeled a approximately 32 kDa protein that was identified as isoform 1 of the voltage-dependent anion channel (VDAC1) [A.M. Cesura, E. Pinard, R. Schubenel, V. Goetschy, A. Friedlein, H. Langen, P. Polcic, M.A. Forte, P. Bernardi, J.A. Kemp, The voltage-dependent anion channel is the target for a new class of inhibitors of the mitochondrial permeability transition pore. J. Biol. Chem. 278 (2003) 49812-49818]. In order to assess the role of VDAC1 in PTP formation and activity, we have studied the properties of mitochondria from VDAC1(-/-) mice. The basic properties of the PTP in VDAC1(-/-) mitochondria were indistinguishable from those of strain-matched mitochondria from wild-type CD1 mice, including inhibition by Ro 68-3400, which labeled identical proteins of 32 kDa in both wild-type and VDAC1(-/-) mitochond...Continue Reading

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