Water deprivation reveals early neuromyopathy in diabetic mice
Endocrine Research, ISSN: 0743-5800, Vol: 26, Issue: 1, Page: 49-57
2000
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Article Description
The effects of water deprivation on peripheral nerve and muscle function were investigated in flexor digitorum superficialis muscle of control and diabetic mice. Twenty mice (30 g average body weight) were injected once with streptozotocin solution (200 mg/kg) to induce experimental diabetes and another 20 mice of similar body weight served as controls. Two weeks later, comparative analyses of in situ muscle isometric contractile characteristics were performed by direct muscle stimulation and indirect nerve stimulation (at 1, 5 and 30 Hz) in urethane-anesthetized (2 mg/g, i.p.) control and diabetic mice. One day prior to the experiments, 10 control and 10 diabetic mice were deprived of water. The study contained four groups: hydrated (H) control, dehydrated (DH) control, H diabetic and DH diabetic. There were no significant differences in synaptic delay or twitch tension between H control and DH control. Comparing H control and H diabetic groups, no differences were noticed in synaptic delay or twitch tension; except at 30 Hz where twitch tension was reduced in H diabetic mice. Significant differences were observed when comparing DH control and DH diabetic mice. DH diabetic showed a significant increase in synaptic delay (from 7.4 to 9.3 ms) and a significant decrease in twitch tension evoked either by indirect nerve or by direct muscle stimulation (from 4.4 g to 1.9 g and from 4.4 g to 2.3 g, respectively). These results revealed that water deprivation enhances diabetes effects at the neuromuscular junction and at the muscle leading to further complication of neuromyopathy.
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