Glucocorticoid receptor–Erythropoietin receptor complex (GR–EPOR complex) (GR–EPOR complex)

The Glucocorticoid receptor–Erythropoietin receptor (GR–EPOR) complex is a functional signaling unit formed by the physical and functional interaction of the nuclear glucocorticoid receptor (GR) and the erythropoietin receptor (EPOR) (Stellacci et al., 2009, Blood). This complex is essential for stress erythropoiesis, where it facilitates the rapid expansion of erythroid progenitor cells in response to acute anemia or hypoxia (Flygare et al., 2011, Blood). Within this complex, GR acts as a co-factor that enhances EPOR-mediated JAK2/STAT5 signaling, thereby promoting the self-renewal of early erythroid progenitors like BFU-E cells and delaying their differentiation (Narla & Mohandas, 2017, Blood Reviews). This synergy is clinically exploited in the treatment of Diamond-Blackfan anemia, where glucocorticoids are administered to increase the sensitivity of erythroid precursors to erythropoietin (Gallagher et al., 2019, Experimental Hematology). Drugs such as dexamethasone and epoetin alfa target the individual components of this complex to modulate red blood cell production. However, long-term activation of this complex via pharmacological agents can lead to significant safety concerns, including hypertension and systemic steroid toxicity (NIH, 2023).

Other names

GR-EPOR complexGlucocorticoid receptor-Erythropoietin receptor interactionNR3C1-EPOR complexGR-EPO-R complex

Synergistic activation of erythroid progenitor expansion through the potentiation of JAK2/STAT5 signaling and transcriptional regulation of cell cycle genes.