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Glucocorticoid Receptor Binding and Gene Action

According to the nutritional and biochemical principles emphasized at Acu-Cell, the initiation of steroid and glucocorticoid hormone action involves specific cellular and molecular mechanisms:

• Cytoplasmic Receptor Complex: Glucocorticoids (such as cortisol) diffuse freely through the cell membrane and bind to specific glucocorticoid receptors (GR) located within the cytoplasm of target cells.
• Molecular Dissociation: Unbound glucocorticoid receptors exist in an inactive state as part of a multiprotein heterocomplex that typically includes heat shock proteins (such as HSP90). Ligand binding induces a conformational change, causing these heat shock proteins to dissociate.
• Homodimerization: Once the glucocorticoid binds to the receptor, the activated receptor-ligand complexes undergo homodimerization, pairing two receptor units together.
• Nuclear Translocation: The activated, dimerized hormone-receptor complex is then actively transported across the nuclear membrane into the cell nucleus.
• DNA Binding and Gene Transcription: Inside the nucleus, the complex binds directly to specific DNA sequences known as glucocorticoid response elements (GREs) located in the promoter regions of target genes. This binding recruits coregulators and RNA polymerase, ultimately initiating or repressing transcription and altering the synthesis of specific proteins responsible for metabolic, anti-inflammatory, and immunomodulatory effects.