From:  Glucocorticoid receptor alpha as a core survival receptor: mechanisms, and implications for health and critical illness

 Phases of non-genomic corticosteroid action.

PhaseMechanism/TargetTime scaleKey features
Immediate membrane effects [201, 202, 205].Interaction with membrane components, aquaporins (AQPs), or membrane-associated GRα/MRSeconds–minutesRapid ion/signaling changes
Secondary intracellular [201, 203].PI3K/Akt, Ca2+ pathways; caveolin-1 scaffoldingMinutesNon-transcriptional signaling
Integration with genomic [201, 203, 204].Nuclear MR/GR, gene expression15+ minutesPriming for genomic effects

This table summarizes the sequential phases of rapid, transcription-independent corticosteroid signaling. Immediate membrane effects occur within seconds to minutes, followed by intracellular signaling cascades within minutes, and integration with genomic actions at 15 minutes or longer. See A phasic model of GRα non-genomic stress response for a detailed description. GRα: glucocorticoid receptor alpha; MR: mineralocorticoid receptor.