Glucocorticoids (GCs) are secreted from the adrenal gland in response to exposure to emotional and physiologic stressors and are responsible for modulating essential metabolic, cardiovascular, immune, and behavioral functions [1–3]. The glucocorticoid receptor (GR) belongs to a family of nuclear hormone receptors that are ligand-dependent transcription factors.

They are involved in activating and repressing gene expression, thereby changing the complement of proteins regulating key signaling pathways [4, 5].

Potential therapeutic applications of selective GR antagonists cover disease areas such as Cushing's syndrome, psychotic depression, diabetes, obesity, Alzheimer's disease, neuropathic pain, drug abuse, and glaucoma.

The Glucocorticoid Receptor Antagonist Library (902 compounds in total) has been designed with receptor-based virtual screening using crystal structures of glucocorticoid receptor complexed with known antagonists (9 structures in total). The complexes were superposed and divided into two groups by structural similarity. On the base of these groups, two different structural models were developed and then used to dock OTAVAchemicals Drug-like Green Collection. In the models, the following parameters have been taken into account: presence of two hydrophobic cores and minimum three hydrogen bonds with a number of key amino acid residues such as ARG:611, ASN:564, GLN:570, GLN:642, LEU:563, MET:604; THR:739. The models were validated with reference set of 1000 compounds obtained from ChEMBL database.

This library comprises drug-like compounds only.

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• Quatrini L, Ugolini S. New insights into the cell- and tissue-specificity of glucocorticoid actions. Cell Mol Immunol 2021; Feb;18(2):269-278.. 
• Armaiz-Pena GN, Lutgendorf SK, Cole SW, Sood AK. Neuroendocrine modulation of cancer progression. Brain Behav Immun 2009;23:10–5.
• McKenna NJ, O'Malley BW. Combinatorial control of gene expression by nuclear receptors and coregulators. Cell 2002;108:465–74.
• Timmermans S, Souffriau J, Claude Libert C. General Introduction to Glucocorticoid Biology. Front Immunol 2019; Jul 4;10:1545.

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