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Chronic treatment with glucocorticoids increases the mass of adipose tissue and promotes metabolic syndrome. However little is known about the molecular effects of dexamethasone on adipose biology. Here, we demonstrated that dexamethasone induces progenitor cells to undergo adipogenesis. In the adipogenic pathway, at least two cell types are found: cells with the susceptibility to undergo staurosporine-induced adipose conversion and cells that require both staurosporine and dexamethasone to undergo adipogenesis. Dexamethasone increased and accelerated the expression of main adipogenic genes such as pparg2, cebpa and srebf1c. Also, dexamethasone altered the phosphorylation pattern of C/EBPβ, which is an important transcription factor during adipogenesis. Dexamethasone also had effect on mature adipocytes mature adipocytes causing the downregulation of some lipogenic genes, promoted a lipolysis state, and decreased the uptake of glucose. These paradoxical effects appear to explain the complexity of the action of glucocorticoids, which involves the hyperplasia of adipose cells and insulin resistance.

Glucocorticoid Paradoxically Recruits Adipose Progenitors and Impairs Lipid Homeostasis and Glucose Transport in Mature Adipocytes