Genetic deletion of the mitochondrial phosphate carrier desensitizes the mitochondrial permeability transition pore and causes cardiomyopathy

J. Q. Kwong, J. Davis, C. P. Baines, M. A. Sargent, J. Karch, Xuejun Wang, T. Huang, J. D. Molkentin

Research output: Contribution to journalArticle

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Abstract

The mitochondrial phosphate carrier (PiC) is critical for ATP synthesis by serving as the primary means for mitochondrial phosphate import across the inner membrane. In addition to its role in energy production, PiC is hypothesized to have a role in cell death as either a component or a regulator of the mitochondrial permeability transition pore (MPTP) complex. Here, we have generated a mouse model with inducible and cardiac-specific deletion of the Slc25a3 gene (PiC protein). Loss of PiC protein did not prevent MPTP opening, suggesting it is not a direct pore-forming component of this complex. However, Slc25a3 deletion in the heart blunted MPTP opening in response to Ca 2+challenge and led to a greater Ca 2+ uptake capacity. This desensitization of MPTP opening due to loss or reduction in PiC protein attenuated cardiac ischemic-reperfusion injury, as well as partially protected cells in culture from Ca 2+ overload induced death. Intriguingly, deletion of the Slc25a3 gene from the heart long-term resulted in profound hypertrophy with ventricular dilation and depressed cardiac function, all features that reflect the cardiomyopathy observed in humans with mutations in SLC25A3. Together, these results demonstrate that although the PiC is not a direct component of the MPTP, it can regulate its activity, suggesting a novel therapeutic target for reducing necrotic cell death. In addition, mice lacking Slc25a3 in the heart serve as a novel model of metabolic, mitochondrial-driven cardiomyopathy.

Original languageEnglish (US)
Pages (from-to)1209-1217
Number of pages9
JournalCell Death and Differentiation
Volume21
Issue number8
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

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Phosphate Transport Proteins
Cardiomyopathies
Cell Death
Proteins
Gene Deletion
Reperfusion Injury
Hypertrophy
Dilatation
Cell Culture Techniques
Adenosine Triphosphate
Phosphates
mitochondrial permeability transition pore
Mutation
Membranes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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Genetic deletion of the mitochondrial phosphate carrier desensitizes the mitochondrial permeability transition pore and causes cardiomyopathy. / Kwong, J. Q.; Davis, J.; Baines, C. P.; Sargent, M. A.; Karch, J.; Wang, Xuejun; Huang, T.; Molkentin, J. D.

In: Cell Death and Differentiation, Vol. 21, No. 8, 01.01.2014, p. 1209-1217.

Research output: Contribution to journalArticle

Kwong, J. Q. ; Davis, J. ; Baines, C. P. ; Sargent, M. A. ; Karch, J. ; Wang, Xuejun ; Huang, T. ; Molkentin, J. D. / Genetic deletion of the mitochondrial phosphate carrier desensitizes the mitochondrial permeability transition pore and causes cardiomyopathy. In: Cell Death and Differentiation. 2014 ; Vol. 21, No. 8. pp. 1209-1217.
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