Chapter 28

Imaging Mitochondrial Membrane Potential and Inner Membrane Permeability

Anna-Liisa Nieminen

Anna-Liisa Nieminen

Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC, USA

Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, USA

Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russian Federation

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Venkat K. Ramshesh

Venkat K. Ramshesh

Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC, USA

Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, USA

GE Healthcare, Quincy, MA, USA

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John J. Lemasters

John J. Lemasters

Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC, USA

Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, USA

Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russian Federation

Department of Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC, USA

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First published: 23 February 2018

Summary

A proton motive force generated by respiratory chain components in the mitochondrial inner membrane drives mitochondrial adenosine triphosphate (ATP) production. Isolation of mitochondria from brain tissue is more problematic because of the intrinsic cellular heterogeneity of the nervous system. Mitochondrial fractions from the brain are typically contaminated with synaptosomes. In the mitochondrial permeability transition (MPT), opening of nonselective, highly conductive permeability transition (PT) pores causes the inner membrane of mitochondria to become permeable to molecules of up to 1500 Da, which leads to mitochondrial depolarization. The molecular composition of PT pores remains uncertain. In one model, PT pores form from the adenine nucleotide translocator (ANT) in the inner membrane, the voltage- dependent anion channel (VDAC) in the outer membrane, and cyclophilin D (CypD), a CsA binding protein from the matrix. In another model, PT pores form from damaged misfolded membrane proteins that aggregate at hydrophilic surfaces facing the bilayer to create aqueous transmembrane channels.

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