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Glucocorticoid-induced insulin resistance is related to macrophage visceral adipose tissue infiltration.
- Source :
-
The Journal of steroid biochemistry and molecular biology [J Steroid Biochem Mol Biol] 2019 Jan; Vol. 185, pp. 150-162. Date of Electronic Publication: 2018 Aug 23. - Publication Year :
- 2019
-
Abstract
- Insulin resistance is frequently present in patients with glucocorticoid (GC) excess (Cushing's syndrome) or treated with high doses of GCs. Furthermore, others similarities between metabolic syndrome (visceral obesity, elevated blood glucose levels, dyslipidemia) and Cushing's syndrome suggest that GCs could play a role in obesity-linked complications. Here we reported that long-term corticosterone (CORT) exposure in mice induced weight gain, dyslipidemia as well as hyperglycaemia and systemic insulin resistance. CORT-treated mice exhibited an increased 11β-Hsd1 expression and corticosterone levels in fat depots but a specific upregulation of glucocorticoid receptor (Gr) and hexose-6-phosphate dehydrogenase only in gonadal adipose tissue, suggesting that GC could act differentially on various fat depots. Despite fat accumulation in all depots, an increased expression of adipogenic (Pparγ, C/ebpα) and lipogenic (Acc, Fas) key genes was restricted to gonadal adipose tissue. Hypertrophied adipocytes observed in both visceral and subcutaneous depots also resulted from reduced lipolytic activity due to CORT treatment. Surprisingly, GC treatment promoted macrophage infiltration (F4/80, Cd68) within all adipose tissues along with predominant M2-like macrophage phenotype, and can directly act on macrophages to induce this phenotype. Moreover, macrophage infiltration preceded mass gain and adipocyte hypertrophy. Of note, specific macrophage depletion in gonadal fat preferentially reduced the M2-like macrophage content, and partially restored insulin sensitivity in mice with GC-induced obesity and insulin resistance. These data provide evidence that GCs act on adipose tissue in a depot-dependent manner and that gonadal adipose macrophages are key effectors of GC-associated insulin resistance.<br /> (Copyright © 2018 Elsevier Ltd. All rights reserved.)
- Subjects :
- 11-beta-Hydroxysteroid Dehydrogenase Type 1 biosynthesis
Adipocytes pathology
Adipose Tissue cytology
Animals
Carbohydrate Dehydrogenases biosynthesis
Cells, Cultured
Cushing Syndrome pathology
Dyslipidemias chemically induced
Hyperglycemia chemically induced
Male
Mice
Mice, Inbred C57BL
Receptors, Glucocorticoid biosynthesis
Weight Gain physiology
Adipose Tissue metabolism
Corticosterone pharmacology
Glucocorticoids metabolism
Insulin Resistance physiology
Macrophages metabolism
Obesity pathology
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1220
- Volume :
- 185
- Database :
- MEDLINE
- Journal :
- The Journal of steroid biochemistry and molecular biology
- Publication Type :
- Academic Journal
- Accession number :
- 30145227
- Full Text :
- https://doi.org/10.1016/j.jsbmb.2018.08.010