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J Mol Cell Cardiol. 2014 Jul;72:316-25. doi: 10.1016/j.yjmcc.2014.04.008. Epub 2014 Apr 21.

Genetic manipulation of the cardiac mitochondrial phosphate carrier does not affect permeability transition.

Author information

1
Dalton Cardiovascular Research Center, University of Missouri-Columbia, Columbia, MO 65211, USA.
2
Department of Medical Pharmacology and Physiology, University of Missouri-Columbia, Columbia, MO 65211, USA.
3
Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, OH 45229, USA; Howard Hughes Medical Institute, Cincinnati, OH 45229, USA.
4
Dalton Cardiovascular Research Center, University of Missouri-Columbia, Columbia, MO 65211, USA; Department of Biomedical Sciences, University of Missouri-Columbia, Columbia, MO 65211, USA; Department of Medical Pharmacology and Physiology, University of Missouri-Columbia, Columbia, MO 65211, USA. Electronic address: bainesc@missouri.edu.

Abstract

The Mitochondrial Permeability Transition (MPT) pore is a voltage-sensitive unselective channel known to instigate necrotic cell death during cardiac disease. Recent models suggest that the isomerase cyclophilin D (CypD) regulates the MPT pore by binding to either the F0F1-ATP synthase lateral stalk or the mitochondrial phosphate carrier (PiC). Here we confirm that CypD, through its N-terminus, can directly bind PiC. We then generated cardiac-specific mouse strains overexpressing or with decreased levels of mitochondrial PiC to assess the functionality of such interaction. While PiC overexpression had no observable pathologic phenotype, PiC knockdown resulted in cardiac hypertrophy along with decreased ATP levels. Mitochondria isolated from the hearts of these mouse lines and their respective non-transgenic controls had no divergent phenotype in terms of oxygen consumption and Ca(2+)-induced MPT, as assessed by swelling and Ca(2+)-retention measurements. These results provide genetic evidence indicating that the mitochondrial PiC is not a critical component of the MPT pore.

KEYWORDS:

Cyclophilin-D; Mitochondrial permeability transition; Mitochondrial phosphate carrier; Mouse genetics

PMID:
24768964
PMCID:
PMC4080311
DOI:
10.1016/j.yjmcc.2014.04.008
[Indexed for MEDLINE]
Free PMC Article

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