Interleukin-6 gene expression is increased in insulin-resistant rat skeletal muscle following insulin stimulation

Febbraio, M, Carey, A, Lamont, B, Andrikopoulos, S, Koukoulas, I and Proietto, J 2003, 'Interleukin-6 gene expression is increased in insulin-resistant rat skeletal muscle following insulin stimulation', Biochemical and Biophysical Research Communications, vol. 302, no. 4, pp. 837-840.


Document type: Journal Article
Collection: Journal Articles

Title Interleukin-6 gene expression is increased in insulin-resistant rat skeletal muscle following insulin stimulation
Author(s) Febbraio, M
Carey, A
Lamont, B
Andrikopoulos, S
Koukoulas, I
Proietto, J
Year 2003
Journal name Biochemical and Biophysical Research Communications
Volume number 302
Issue number 4
Start page 837
End page 840
Total pages 4
Publisher Academic Press
Abstract IL-6 expression in skeletal muscle is stimulated by contractions. We sought to examine whether hyperinsulinaemia increases IL-6 mRNA in skeletal muscle and whether any increase is modified in insulin resistant muscle. We hypothesized that intramuscular IL-6 mRNA would be increased in response to insulin, but such an affect would be unaffected by insulin resistance because the primary insulin sensitive signalling protein responsible for activating IL-6 functions normally in insulin resistant muscle. Transgenic rats over-expressing the gluconeogenic regulatory enzyme phosphoenolpyruvate carboxykinase (PEPCK) were studied. White gastrocnemius muscle samples were obtained under hyperinsulinaemic, euglycaemic clamp (4 mU kg-1 min-1 insulin, plasma glucose concentration 4-6 mmol L-1) and basal conditions in both PEPCK (basal n=4; insulin n=5) and wild-type (CON) (basal n=5; insulin n=4) rats, which were previously injected with a bolus of 2-[1-14C]deoxyglucose (2-DG) into the carotid artery. Muscle samples were assayed for 2-DG uptake and IL-6 mRNA. No differences in 2-DG uptake or IL-6 mRNA were observed when comparing groups under basal conditions. Under clamp conditions, 2-DG uptake was lower (P<0.05) in PEPCK compared with CON. Insulin stimulation in CON did not change IL-6 mRNA compared with basal levels. In contrast, there was an not, vert, similar8-fold increase (P<0.05) in IL-6 mRNA in insulin-stimulated PEPCK compared with CON basal levels. Insulin stimulation increases IL-6 gene expression in insulin resistant, but not healthy, skeletal muscle, suggesting that IL-6 expression in skeletal muscle is sensitive to changes in insulin in circumstances of insulin resistance. It is likely that the differences observed when comparing healthy with insulin resistant muscle are due to the differential activation of insulin sensitive signalling proteins responsible for activating IL-6.
Subject Endocrinology
DOI - identifier 10.1016/S0006-291X(03)00267-5
Copyright notice Copyright © 2003 Elsevier Science (USA). All rights reserved.
ISSN 0006-291X
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