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• W1971287334 endingPage "235" @default.
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• W1971287334 abstract "Symmetrical sensory polyneuropathy, the most common form of diabetic neuropathy in humans, is associated with a spectrum of structural changes in peripheral nerve that includes axonal degeneration, paranodal demyelination, and loss of myelinated fibers--the latter probably the result of a dying-back of distal axons. Mitochondrial dysfunction has recently been proposed as an etiological factor in this degenerative disease of the peripheral nervous system. Lack of neurotrophic support has been proposed as a contributing factor in the etiology of diabetic neuropathy based on studies in animal models of Type I diabetes. We have recently demonstrated that insulin and neurotrophin-3 (NT-3) modulate mitochondrial membrane potential in cultured adult sensory neurons. We therefore tested the hypothesis that diabetes-induced mitochondrial dysfunction is caused by impairments in neurotrophic support. We have used real-time fluorescence video microscopy to analyze mitochondrial membrane potential in cultured adult sensory neurons isolated from normal and diabetic rats. Diabetes caused a significant loss of mitochondrial membrane potential in all sub-populations of sensory neurons which can be prevented by in vivo treatment with insulin or NT-3. The mechanism of insulin and NT-3-dependent modulation of mitochondrial membrane potential involves the activation of the phosphoinositide 3 kinase (PI 3 kinase) pathway. Downstream targets of PI 3 kinase, such as Akt and the transcription factor cAMP response element-binding protein (CREB), are activated by insulin and NT-3 and regulate sensory neuron gene expression. These alterations in gene expression modulate critical components of metabolite pathways and the electron transport chain associated with the neuronal mitochondrion. Our results show that in adult sensory neurons, treatment with insulin can elevate the input of reducing equivalents into the mitochondrial electron transport chain, which leads to greater mitochondrial membrane polarization and enhanced ATP synthesis." @default.
• W1971287334 created "2016-06-24" @default.
• W1971287334 creator A5012066120 @default.
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• W1971287334 date "2003-12-01" @default.
• W1971287334 modified "2023-10-15" @default.
• W1971287334 title "Mechanism of mitochondrial dysfunction in diabetic sensory neuropathy" @default.
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• W1971287334 doi "https://doi.org/10.1111/j.1085-9489.2003.03028.x" @default.
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