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Updated: Jul 18, 2025
Immunolabelling Myofiber Degeneration in Muscle Biopsies
Published on: December 5, 2019
ANT-dependent MPTP underlies necrotic myofiber death in muscular dystrophy
Michael J Bround1, Julian R Havens1, Allen J York1
1Department of Pediatrics, Cincinnati Children's Hospital and the University of Cincinnati, Cincinnati, OH, USA.
Abstract:
Mitochondrial permeability transition pore (MPTP) formation contributes to ischemia-reperfusion injury in the heart and several degenerative diseases, including muscular dystrophy (MD). MD is a family of genetic disorders characterized by progressive muscle necrosis and premature death. It has been proposed that the MPTP has two molecular components, the adenine nucleotide translocase (ANT) family of proteins and an unknown component that requires the chaperone cyclophilin D (CypD) to activate. This model was examined in vivo by deleting the gene encoding ANT1 (Slc25a4) or CypD (Ppif) in a δ-sarcoglycan (Sgcd) gene-deleted mouse model of MD, revealing that dystrophic mice lacking Slc25a4 were partially protected from cell death and MD pathology. Dystrophic mice lacking both Slc25a4 and Ppif together were almost completely protected from necrotic cell death and MD disease. This study provides direct evidence that ANT1 and CypD are required MPTP components governing in vivo cell death, suggesting a previously unrecognized therapeutic approach in MD and other necrotic diseases.
Insights
Mitochondrial permeability transition pore (MPTP) formation is implicated in muscular dystrophy (MD). Deleting key MPTP components ANT1 and cyclophilin D (CypD) in mice significantly protected against MD pathology and cell death.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Mitochondrial permeability transition pore (MPTP) formation is a key event in cellular damage, implicated in ischemia-reperfusion injury and degenerative diseases like muscular dystrophy (MD).
- The MPTP is hypothesized to involve adenine nucleotide translocase (ANT) and cyclophilin D (CypD), but its in vivo function in MD remains unclear.
Purpose of the Study:
- To investigate the in vivo roles of ANT1 and CypD as essential components of the MPTP in the context of muscular dystrophy.
Main Methods:
- Utilized a mouse model with genetic deletion of δ-sarcoglycan (Sgcd) to mimic MD pathology.
- Generated Sgcd-deleted mice lacking either ANT1 (Slc25a4) or CypD (Ppif) genes, or both, to assess their impact on disease progression.
Main Results:
- Mice lacking ANT1 (Slc25a4) showed partial protection against cell death and MD pathology.
- Mice lacking both ANT1 and CypD were almost completely protected from necrotic cell death and MD disease progression.
Conclusions:
- Provides direct in vivo evidence that ANT1 and CypD are critical components of the MPTP responsible for cell death in muscular dystrophy.
- Suggests targeting ANT1 and CypD offers a potential therapeutic strategy for MD and other diseases involving necrotic cell death.
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