Genetic manipulation of the cardiac mitochondrial phosphate carrier does not affect permeability transition.
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.
Dalton Cardiovascular Research Center, University of Missouri-Columbia, Columbia, MO 65211, USA.
Manuel
M
Gutiérrez-Aguilar
Dalton Cardiovascular Research Center, University of Missouri-Columbia, Columbia, MO 65211, USA.
Diana L
DL
Douglas
Department of Medical Pharmacology and Physiology, University of Missouri-Columbia, Columbia, MO 65211, USA.
Anne K
AK
Gibson
Department of Medical Pharmacology and Physiology, University of Missouri-Columbia, Columbia, MO 65211, USA.
Timothy L
TL
Domeier
Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, OH 45229, USA; Howard Hughes Medical Institute, Cincinnati, OH 45229, USA.
Jeffery D
JD
Molkentin
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.
Christopher P
CP
Baines
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000378:metabolism; D006332:Cardiomegaly / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D000081406:Peptidyl-Prolyl Isomerase F; D021983:Cyclophilins / Q000235:genetics* / Q000378:metabolism; D005786:Gene Expression Regulation; D005818:Genetic Engineering; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D008928:Mitochondria / Q000378:metabolism* / Q000473:pathology; D033681:Mitochondrial Membrane Transport Proteins / Q000235:genetics* / Q000378:metabolism; D051336:Mitochondrial Membranes / Q000378:metabolism*; D000083162:Mitochondrial Permeability Transition Pore; D008958:Models, Molecular; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D010101:Oxygen Consumption; D028061:Phosphate Transport Proteins / Q000235:genetics* / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D015398:Signal Transduction
D000081406:Peptidyl-Prolyl Isomerase F; D033681:Mitochondrial Membrane Transport Proteins; D000083162:Mitochondrial Permeability Transition Pore; C000631446:PPIF protein, mouse; D028061:Phosphate Transport Proteins; D000255:Adenosine Triphosphate; D021983:Cyclophilins; D002118:Calcium
Cyclophilin-D; Mitochondrial permeability transition; Mitochondrial phosphate carrier; Mouse genetics