Investigation of Properties of the Mitochondrial Permeability Transition Pore Using Whole-Mitoplast Patch-Clamp Technique

Maria A. Neginskaya, Evgeny V. Pavlov

Research output: Contribution to journalArticlepeer-review

Abstract

The mitochondrial permeability transition pore (mPTP) is a channel in the mitochondrial inner membrane that is activated by excessive calcium uptake. In this study, we used a whole-mitoplast patch-clamp approach to investigate the ionic currents associated with mPTP at the level of the whole single mitochondrion. The whole-mitoplast conductance was at the level of 5 to 7 nS, which is consistent with the presence of three to six single mPTP channels per mitochondrion. We found that mPTP currents are voltage dependent and inactivate at negative potential. The currents were inhibited by cyclosporine A and adenosine diphosphate. When mPTP was induced by oxidative stress, currents were partially blocked by the adenine nucleotide translocase inhibitor bongkrekic acid. Our data suggest that the whole-mitoplast patch-clamp approach is a useful method for investigating the biophysical properties and regulation of the mPTP.

Original languageEnglish (US)
Pages (from-to)481-487
Number of pages7
JournalDNA and cell biology
Volume42
Issue number8
DOIs
StatePublished - Aug 1 2023

Keywords

  • calcium
  • cyclosporine A
  • mitochondria
  • mitochondrial permeability transition
  • whole-mitoplast patch clamp

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cell Biology

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