Reduced phosphorylation of AS160 contributes to glucocorticoid-mediated inhibition of glucose uptake in human and murine adipocytes
Abstract
Excess glucocorticoids induce insulin resistance and reduce glucose uptake although the underlying mechanisms are unclear. Here we demonstrate that Dex (1 microM for 24h) inhibits basal and insulin (1 nM) stimulated glucose uptake in human and murine adipocytes by 50% with a concomitant reduction in the levels of GLUT1/4 at the plasma membrane but no change in total GLUT1/4 levels. Expression and phosphorylation of proximal insulin signalling molecules (IRS1, PI3K, AKT) was unaffected by Dex as was phosphorylation of mTOR and FOXO1. In contrast, phosphorylation of AKT substrate 160kDa (AS160) at T642, which is essential for 14-3-3 recruitment and GLUT4 translocation, was reduced by 50% in basal and insulin-stimulated cells and this was mirrored by decreased 14-3-3 association. Co-treatment with the glucocorticoid receptor antagonist RU486 (10 microM) abrogated the Dex effect on AS160-T642 phosphorylation and restored glucose uptake by 80%. These data suggest Dex inhibits glucose uptake in adipocytes, at least in part, by reducing AS160 phosphorylation and interaction with 14-3-3.
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Cortisol regulates glucose uptake by antagonising insulin-mediated translocation of GLUTs in fat and muscle.
“CORT regulates glucose uptake by antagonising the insulin-mediated translocation of GLUTs in fat and muscle ( 32-35 ),”
From Dynamic modulation of glucose utilisation by glucocorticoid rhythms in health and disease (2020) · cites this paper as [32]
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- Authors
- Ngo, S., Barry, J. B., Nisbet, J. C., Prins, J. B., & Whitehead, J. P.
- Affiliations
- The University of Queensland (AU)
- Venue
- Molecular and Cellular Endocrinology
- Publisher
- Elsevier BV
- Published
- 2009-04
- Volume
- 302
- Issue
- 1
- Pages
- 33-40
- ISSN
- 0303-7207 (ISSN-L)
- OpenAlex
- W2003401065
- Cited by
- 17
- References
- 50
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 1 · 2021: 2 · 2020: 2 · 2018: 1 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 3 · 2012: 1
- FWCI
- 0.27
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Molecular and Cellular Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- ResearchSpace (University of Auckland) (submittedVersion)
- Funders
- Lions Medical Research Foundation
- National Health and Medical Research Council
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
- Keywords
- AS160, glucocorticoid resistance, dexamethasone, glucose uptake, adipocytes, insulin signaling, GLUT4 translocation, GLUT1, 14-3-3 proteins, Akt phosphorylation, insulin resistance, glucocorticoid receptor, RU486, mTOR, FOXO1
- MeSH terms
- Animals, Cells, Cultured, Cricetulus, Gene Expression Regulation, Glucocorticoids, Glucose, Cricetinae, Humans, Insulin, Phosphorylation, Protein Binding, Signal Transduction, CHO Cells, Adipocytes, GTPase-Activating Proteins, 14-3-3 Proteins, Carbohydrate Metabolism, Mice
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