Correlation between different gene expression assays designed to measure trans-activation potencies of systemic glucocorticoids

Steroids
D JaffuelM Mathieu

Abstract

The glucocorticoids (GC) betamethasone, dexamethasone, hydrocortisone, methylprednisolone, prednisolone and triamcinolone acetonide are currently used in the treatment of inflammatory diseases. Through a process called trans-activation, GC activate gene expression and produce various physiological and pharmacological effects. In particular, by inducing gluconeogenic enzymes, long-term GC treatment may cause diabetes. Using three different assays, we have extensively compared the capacity of the above GC to activate gene expression. trans-Activation of a GC inducible luciferase gene was assessed in HeLa and A549 cells after stable and transient transfection, respectively. In hepatoma tissue culture cells, we measured trans-activation of the endogenous gene encoding tyrosine aminotransferase, a gluconeogenic enzyme. Half-maximal effective concentrations of GC were determined by dose-response analyses. Results obtained with these assays were highly correlated and GC were ranked in three groups according to their trans-activation potency: betamethasone, dexamethasone, and triamcinolone acetonide > methylprednisolone and prednisolone > hydrocortisone. Potencies were not strictly related to receptor binding affinities and not signifi...Continue Reading

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