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Effect of parathyroid hormone on rat skeletal muscle in vivo
C H Thompson1, G J Kemp, G K Radda
1MRC Biochemical and Clinical Magnetic Resonance Unit, Oxford Radcliffe Hospital, UK.
Abstract:
The secondary hyperparathyroidism of chronic renal failure has been implicated in the pathogenesis of metabolic abnormalities in skeletal muscle. We studied the muscle metabolism in a model of hyperparathyroidism (Wistar rats injected with parathyroid hormone or saline for 4 days). 31P magnetic resonance spectroscopy allowed measurements of the concentration of cytosolic metabolically active inorganic phosphate [Pi] at rest and the rates of oxidative and anaerobic adenosine triphosphate turnover during exercise and recovery. Parathyroid hormone caused significant reductions in plasma [Pi] and intracellular [Pi], but had no effect upon oxidative or glycogenolytic adenosine triphosphate turnover.