Mitochondrial Oxygen Consumption by the Foreskin and its Fibroblast Rich Culture = إستهلاك الأوكسجين في المايتوكوندريا من قبل القلفة و الخلايا الليفية

Abstract

abstract:Objectives: This study investigated the feasibility of using a phosphorescence oxygen analyser to measure cellular respiration (mitochondrial O 2 consumption) in foreskin samples and their fibroblast-rich cultures. Methods: Foreskin specimens from normal infants were collected immediately after circumcision and processed for measuring cellular respiration and for culture. Cellular mitochondrial O 2 consumption was determined as a function of time from the phosphorescence decay of the Pd (II) meso-tetra-(4-sulfonatophenyl)-tetrabenzoporphyrin. Results: In sealed vials containing a foreskin specimen and glucose, O 2 concentration decreased linearly with time, confirming the zero-order kinetics of O 2 consumption by cytochrome oxidase. Cyanide inhibited O 2 consumption, confirming that the oxidation occurred mainly in the mitochondrial respiratory chain. The rate of foreskin respiration (mean ± SD) was 0.074 ± 0.02 μM O 2 min -1 mg -1 (n = 23). The corresponding rate for fibroblast-rich cultures was 9.84 ± 2.43 μM O 2 min -1 per 10 7 cells (n = 15). Fibroblast respiration was significantly lower in a male infant with dihydrolipoamide dehydrogenase gene mutations, but normalised with the addition of thiamine or carnitine. Conclusion: The foreskin and its fibroblast-rich culture are suitable for assessment of cellular respiration. However, the clinical utility of foreskin specimens to detect disorders of impaired cellular bioenergetics requires further investigation. Keywords