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No effect of NOS inhibition on skeletal muscle glucose uptake during in situ hindlimb contraction in healthy and diabetic Sprague-Dawley rats
journal contribution
posted on 2015-05-15, 00:00 authored by Y H Hong, Andrew BetikAndrew Betik, D Premilovac, R M Dwyer, Michelle KeskeMichelle Keske, S Rattigan, G K McConellNitric oxide (NO) has been shown to be involved in skeletal muscle glucose uptake during contraction/exercise, especially in individuals with Type 2 diabetes (T2D). To examine the potential mechanisms, we examined the effect of local NO synthase (NOS) inhibition on muscle glucose uptake and muscle capillary blood flow during contraction in healthy and T2D rats. T2D was induced in Sprague-Dawley rats using a combined high-fat diet (23% fat wt/wt for 4 wk) and low-dose streptozotocin injections (35 mg/kg). Anesthetized animals had one hindlimb stimulated to contract in situ for 30 min (2 Hz, 0.1 ms, 35 V) with the contralateral hindlimb rested. After 10 min, the NOS inhibitor, N(G)-nitro-l-arginine methyl ester (l-NAME; 5 μM) or saline was continuously infused into the femoral artery of the contracting hindlimb until the end of contraction. Surprisingly, there was no increase in skeletal muscle NOS activity during contraction in either group. Local NOS inhibition had no effect on systemic blood pressure or muscle contraction force, but it did cause a significant attenuation of the increase in femoral artery blood flow in control and T2D rats. However, NOS inhibition did not attenuate the increase in muscle capillary recruitment during contraction in these rats. Muscle glucose uptake during contraction was significantly higher in T2D rats compared with controls but, unlike our previous findings in hooded Wistar rats, NOS inhibition had no effect on glucose uptake during contraction. In conclusion, NOS inhibition did not affect muscle glucose uptake during contraction in control or T2D Sprague-Dawley rats, and this may have been because there was no increase in NOS activity during contraction.
History
Journal
American journal of physiology: regulatory, integrative and comparative physiologyVolume
308Issue
10Pagination
R862 - R871Publisher
American Physiological SocietyLocation
Bethesda, Md.Publisher DOI
eISSN
1522-1490Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2015, American Physiological SocietyUsage metrics
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No categories selectedKeywords
Type 2 diabetescapillary recruitmentcontrast-enhanced ultrasoundfemoral blood flownitric oxide synthase activityAnimalsBiological TransportDiabetes Mellitus, ExperimentalDiabetes Mellitus, Type 2Diet, High-FatEnzyme InhibitorsGlucoseHindlimbMuscle ContractionMuscle, SkeletalNG-Nitroarginine Methyl EsterNitric Oxide SynthaseRatsRats, Sprague-DawleyScience & TechnologyLife Sciences & BiomedicinePhysiologyNITRIC-OXIDE SYNTHASEACTIVATED PROTEIN-KINASEBLOOD-FLOWINSULIN-RESISTANCEGENE-EXPRESSIONEXERCISETRANSPORTAMPKINDIVIDUALSMETABOLISM
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