Histone deacetylase 2–glucocorticoid receptor complex (HDAC2-GR complex)

The Histone deacetylase 2–glucocorticoid receptor (HDAC2-GR) complex is a critical molecular assembly responsible for the anti-inflammatory effects of corticosteroids. Upon activation by a ligand, the glucocorticoid receptor (GR) translocates to the nucleus and recruits HDAC2 to the promoters of pro-inflammatory genes, such as those encoding IL-8 and TNF-alpha [1][2]. HDAC2 then removes acetyl groups from histones H3 and H4, which were previously acetylated by co-activators like CBP, leading to chromatin condensation and the repression of gene transcription [2]. This mechanism is the primary pathway for suppressing airway inflammation in diseases like asthma. However, in conditions of high oxidative or nitrative stress, such as COPD or severe asthma, HDAC2 is often inactivated or degraded, leading to profound corticosteroid resistance [3]. Therapeutic strategies, including the use of low-dose theophylline, aim to restore HDAC2 activity and its recruitment to the GR complex to regain steroid sensitivity [3][4]. Understanding this complex is vital for managing patients who do not respond to standard anti-inflammatory therapies.

Other names

HDAC2-NR3C1 complexGlucocorticoid receptor-HDAC2 complexGR-HDAC2 complexCorticosteroid receptor-HDAC2 complex

Glucocorticoid receptor agonists (corticosteroids) trigger the translocation of the receptor to the nucleus, where it recruits HDAC2 to inflammatory gene promoters to deacetylate histones and repress transcription.