Lee-Young, RS and Hoffman, NJ and Murphy, KT and Henstridge, DC and Samocha-Bonet, D and Siebel, AL and Iliades, P and Zivanovic, B and Hong, YH and Colgan, TD and Kraakman, MJ and Bruce, CR and Gregorevic, P and McConell, GK and Lynch, GS and Drummond, GR and Kingwell, BA and Greenfield, JR and Febbraio, MA, Glucose-6-phosphate dehydrogenase contributes to the regulation of glucose uptake in skeletal muscle, Molecular Metabolism, 5, (11) pp. 1083-1091. ISSN 2212-8778 (2016) [Refereed Article]
Copyright 2016 The Authors. Licensed under Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/
Objective: The development of skeletal muscle insulin resistance is an early physiological defect, yet the intracellular mechanisms accounting for this metabolic defect remained unresolved. Here, we have examined the role of glucose-6-phosphate dehydrogenase (G6PDH) activity in the pathogenesis of insulin resistance in skeletal muscle.
Methods: Multiple mouse disease states exhibiting insulin resistance and glucose intolerance, as well as obese humans defined as insulin-sensitive, insulin-resistant, or pre-diabetic, were examined.
Results: We identified increased glucose-6-phosphate dehydrogenase (G6PDH) activity as a common intracellular adaptation that occurs in parallel with the induction of insulin resistance in skeletal muscle and is present across animal and human disease states with an underlying pathology of insulin resistance and glucose intolerance. We observed an inverse association between G6PDH activity and nitric oxide synthase (NOS) activity and show that increasing NOS activity via the skeletal muscle specific neuronal (n)NOSμ partially suppresses G6PDH activity in skeletal muscle cells. Furthermore, attenuation of G6PDH activity in skeletal muscle cells via (a) increased nNOSμ/NOS activity, (b) pharmacological G6PDH inhibition, or (c) genetic G6PDH inhibition increases insulin-independent glucose uptake.
Conclusions: We have identified a novel, previously unrecognized role for G6PDH in the regulation of skeletal muscle glucose metabolism.
|Item Type:||Refereed Article|
|Keywords:||enzyme activity, glucose metabolism, insulin sensitivity, glucose 6 phosphate dehydrogenase, glutathione peroxidase, nitric oxide synthase, glucose, glucose 6 phosphate, glucose 6 phosphate dehydrogenase, insulin, nitric oxide, adaptation|
|Research Division:||Biological Sciences|
|Research Group:||Biochemistry and cell biology|
|Research Field:||Cell metabolism|
|Objective Group:||Clinical health|
|Objective Field:||Clinical health not elsewhere classified|
|UTAS Author:||Henstridge, DC (Mr Darren Henstridge)|
|Web of Science® Times Cited:||10|
|Deposited By:||Health Sciences|
|Downloads:||7 View Download Statistics|
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