Mayr 2004 Pediatr Res

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Mayr JA, Paul J, Pecina P, Kurnik P, Forster H, Fotschl U, Sperl W, Houstek J (2004) Reduced respiratory control with ADP and changed pattern of respiratory chain enzymes as a result of selective deficiency of the mitochondrial ATP synthase. Pediatr Res 55:988-94.

» PMID: 15155867;Open Access

Mayr JA, Paul J, Pecina P, Kurnik P, Forster H, Fotschl U, Sperl W, Houstek J (2004) Pediatr Res

Abstract: The FoF1-ATPase, a multisubunit protein complex of the inner mitochondrial membrane, produces most of the ATP in mammalian cells. Mitochondrial diseases as a result of a dysfunction of ATPase can be caused by mutations in mitochondrial DNA-encoded ATPase subunit a or rarely by an ATPase defect of nuclear origin. Here we present a detailed functional and immunochemical analysis of a new case of selective and generalized ATPase deficiency found in an Austrian patient. The defect manifested with developmental delay, muscle hypotonia, failure to thrive, ptosis, and varying lactic acidemia (up to 12 mmol/L) beginning from the neonatal period. A low-degree dilated cardiomyopathy of the left ventricle developed between the age of 1 and 2 y. A >90% decrease in oligomycin-sensitive ATPase activity and an 86% decrease in the content of the ATPase complex was found in muscle mitochondria. It was associated with a significant decrease of ADP-stimulated respiration of succinate (1.5-fold) and respiratory control with ADP (1.7-fold) in permeabilized muscle fibers, and with a slight decrease of the respiratory Complex I and compensatory increase in the content of Complexes III and IV. The same ATPase deficiency without an increase in respiratory chain complexes was found in fibroblasts, suggesting a generalized defect with tissue-specific manifestation. Absence of any mutations in mitochondrial ATP6 and ATP8 genes indicates a nuclear origin of the defect.


O2k-Network Lab: CZ Prague Houstek J, AT Salzburg Sperl W


Labels: MiParea: Respiration, nDNA;cell genetics, mt-Medicine, Patients  Pathology: Other 

Organism: Human  Tissue;cell: Heart, Skeletal muscle, Fibroblast  Preparation: Permeabilized tissue  Enzyme: Complex I, Complex III, Complex IV;cytochrome c oxidase, Complex V;ATP synthase 

Coupling state: LEAK, OXPHOS  Pathway:HRR: Oxygraph-2k