Decreased Glucocorticoid Signaling Potentiates Lipid-Induced Inflammation and Contributes to Insulin Resistance in the Skeletal Muscle of Fructose-Fed Male Rats Exposed to Stress
2021
Authors:
Shirif, Abdulbaset ZidaneKovačević, Sanja
Brkljačić, Jelena
Teofilović, Ana
Elaković, Ivana
Đorđević, Ana
Matić, Gordana
Document Type:
Article (Published version)
Metadata
Show full item recordAbstract:
The modern lifestyle brings both excessive fructose consumption and daily exposure
to stress which could lead to metabolic disturbances and type 2 diabetes. Muscles are important
points of glucose and lipid metabolism, with a crucial role in the maintenance of systemic energy
homeostasis. We investigated whether 9-week fructose-enriched diet, with and without exposure to 4-
week unpredictable stress, disturbs insulin signaling in the skeletal muscle of male rats and evaluated
potential contributory roles of muscle lipid metabolism, glucocorticoid signaling and inflammation.
The combination of fructose-enriched diet and stress increased peroxisome proliferator-activated
receptors- and - and stimulated lipid uptake, lipolysis and -oxidation in the muscle of fructosefed
stressed rats. Combination of treatment also decreased systemic insulin sensitivity judged by
lower R-QUICKI, and lowered muscle protein content and stimulatory phosphorylations of insulin
receptor supstrate-1 and Akt, as well as the level of 11 -hydroxysteroid dehydrogenase type 1
and glucocorticoid receptor. At the same time, increased levels of protein tyrosine phosphatase-1B,
nuclear factor- B, tumor necrosis factor- , were observed in the muscle of fructose-fed stressed rats.
Based on these results, we propose that decreased glucocorticoid signaling in the skeletal muscle
can make a setting for lipid-induced inflammation and the development of insulin resistance in
fructose-fed stressed rats.
Keywords:
fructose; chronic stress; skeletal muscle; glucocorticoids; insulin; lipid metabolismSource:
International Journal of Molecular Sciences, Special Issue Glucocorticoids and Metabolic Disorders, 2021, 22, 13, 7206-Funding / projects:
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200007 (University of Belgrade, Institute for Biological Research 'Siniša Stanković') (RS-MESTD-inst-2020-200007)
- Swiss National Science Foundation, Grant SCOPES JRP IZ73Z0_152331
DOI: 10.3390/ijms22137206
ISSN: 1422-0067