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Mitochondrial complex V expression and activity in cystinotic fibroblasts
Martijn J Wilmer1, Lambertus P van den Heuvel, Richard J Rodenburg
1Laboratory of Pediatrics and Neurology, Radboud University Nijmegen Medical Centre, Nijmegen, 6500 HB, The Netherlands. m.wilmer@cukz.umcn.nl
Cystinosis, a cause of Fanconi syndrome, is linked to low ATP levels. This study found normal mitochondrial complex V activity, ruling out oxidative phosphorylation defects as the cause of decreased ATP in cystinotic cells.
Area of Science:
- Biochemistry
- Cell Biology
- Genetics
Background:
- Cystinosis is the most common inherited Fanconi syndrome.
- Altered ATP metabolism is implicated in cystinosis pathogenesis.
- Previous studies noted normal respiratory chain complex I-IV activity but decreased ATP in cystinotic fibroblasts.
Purpose of the Study:
- To investigate the role of mitochondrial complex V in the ATP decrease observed in cystinosis.
- To determine if mitochondrial oxidative phosphorylation enzymes contribute to reduced ATP levels in cystinotic fibroblasts.
Main Methods:
- Cultured cystinotic fibroblasts were used.
- Mitochondrial complex V expression and activity were assessed.
Main Results:
- Normal expression of mitochondrial complex V was observed in cystinotic fibroblasts.
- Normal activity of mitochondrial complex V was confirmed in these cells.
Conclusions:
- Mitochondrial complex V is not responsible for the decreased ATP levels in cystinosis.
- Alterations in mitochondrial oxidative phosphorylation enzymes do not explain the ATP deficit in cystinotic fibroblasts.
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