Cited by 225Nitric Oxide and Endothelin EffectsMetabolism, Diabetes, and CancerMuscle Physiology and Disorders

Expression of nitric oxide synthase in skeletal muscle: a novel role for nitric oxide as a modulator of insulin action.

Kapur, Sonia, Bédard, Sylvain, Marcotte, Bruno, Côté, Claude H, Marette, André·1997·Diabetes

Abstract

Previous studies have shown that nitric oxide synthase (NOS), the enzyme that catalyzes the formation of nitric oxide (NO), is expressed in skeletal muscle. The aim of the present study was to test the hypothesis that NO can modulate glucose metabolism in slow- and fast-twitch skeletal muscles. Calcium-dependent NOS was detected in skeletal muscle, and the enzyme activity was greater in fast-type extensor digitorum longus (EDL) muscles than in slow-type soleus muscles. Both the neuronal-type (nNOS) and endothelial-type (eNOS) enzymes are expressed in resting skeletal muscles. However, nNOS protein was only detected in EDL muscles, whereas eNOS protein contents were comparable in soleus and EDL muscles. NOS expression in muscle cryosections (diaphorase histochemistry) was located in vascular endothelium and in muscle fibers, and the staining was greater in type IIb than in type I and IIa fibers. The macrophage-type inducible NOS (iNOS) was not detected in resting muscle, but endotoxin treatment induced its expression, concomitant with elevated NO production. iNOS induction was associated with impaired insulin-stimulated glucose uptake in isolated rat muscles. In vitro, NOS blockade with specific inhibitors did not affect basal or insulin-stimulated glucose transport in EDL or soleus muscles. In contrast, the NO donors GEA 5024 and sodium nitroprusside induced dose-dependent inhibition (up to 50%) of maximal insulin-stimulated glucose transport in both muscles with minor effects on basal uptake values. GEA 5024 also blunted insulin-stimulated glucose transport and amino acid uptake in cultured L6 muscle cells without affecting insulin binding to its receptor. On the other hand, the permeable cGMP analogue dibutyryl cGMP did not affect muscle glucose transport. These results strongly suggest that NO modulates insulin action in both slow- and fast-type skeletal muscles. This novel autocrine action of NO in muscle appears to be mediated by cGMP-independent pathways.

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Crossref · 10.2337/diab.46.11.1691

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Authors
Kapur, S., Bédard, S., Marcotte, B., Côté, C. H., & Marette, A.
Affiliations
  • Université Laval (CA)
  • Department of Physiology and Lipid Research Unit, Laval University Hospital Research Center Quebec, G1V 4G2, Canada
Venue
Diabetes
Published
1997-11-01
Volume
46
Issue
11
Pages
1691-1700
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2104847030
Cited by
225
References
0
Citations by year
2026: 2 · 2024: 1 · 2023: 3 · 2022: 2 · 2020: 2 · 2019: 4 · 2018: 4 · 2017: 5 · 2016: 5 · 2015: 8 · 2014: 5 · 2013: 5 · 2012: 11
FWCI
5.70
Type
journal article
Language
en
Open access
closed
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
nitric oxide synthase, nitric oxide, skeletal muscle, insulin action, insulin-stimulated glucose transport, fast-twitch muscle, slow-twitch muscle, extensor digitorum longus, soleus muscle, neuronal nitric oxide synthase, endothelial nitric oxide synthase, inducible nitric oxide synthase, endotoxin, amino acid uptake, cGMP-independent signaling, autocrine signaling
MeSH terms
Amino Acids, Animals, Cell Line, Dibutyryl Cyclic GMP, Endothelium, Vascular, Glucose, Insulin, Isoenzymes, Kinetics, Dihydrolipoamide Dehydrogenase, Myosins, Nitric Oxide, Organ Specificity, Triazoles, Rats, Sprague-Dawley, Muscle, Skeletal, Muscle Fibers, Fast-Twitch, Muscle Fibers, Slow-Twitch, Nitric Oxide Synthase, Rats

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