Human and rodent muscle Na(+)-K(+)-ATPase in diabetes related to insulin, starvation, and training - PubMed (original) (raw)
Human and rodent muscle Na(+)-K(+)-ATPase in diabetes related to insulin, starvation, and training
T A Schmidt et al. J Appl Physiol (1985). 1994 May.
Abstract
As determined by vanadate-facilitated [3H]ouabain binding to intact samples, semistarvation and untreated streptozotocin- or partial pancreatectomy-induced diabetes reduced rat soleus muscle Na(+)-K(+)-adenosinetriphosphatase (Na(+)-K(+)-ATPase) concentration by 12-21% (P < 0.05). Conversely, insulin treatment of rats with streptozotocin-induced diabetes induced an increase of 18-26% above control (P < 0.05). Treadmill training diminished the reduction in muscle [3H]ouabain binding site concentration induced by untreated diabetes to only 2-5%. No significant variation was observed in rat cerebral cortex Na(+)-K(+)-ATPase concentration as a result of diabetes, semistarvation, or insulin treatment. In human subjects, Na(+)-K(+)-ATPase concentration in vastus lateralis muscle biopsies was 17 and 22% greater (P < 0.05), respectively, in patients with treated non-insulin-dependent diabetes mellitus (n = 24) and insulin-dependent diabetes mellitus (n = 7) than in control subjects (n = 8). A positive linear correlation between muscle Na(+)-K(+)-ATPase and plasma insulin concentrations was observed (r = 0.50, P = 0.006; n = 29). Thus, insulin seems a regulator of muscle Na(+)-K(+)-ATPase concentration, reduction of muscle Na(+)-K(+)-ATPase concentration with untreated diabetes bears similarities with undernourishment, and physical conditioning may ameliorate the muscle Na(+)-K(+)-ATPase concentration decrease induced by diabetes.
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