Granulocyte-Macrophage Colony-Stimulating Factor Receptor Beta Chain (βc)

The granulocyte-macrophage colony-stimulating factor receptor (GM-CSFR) beta chain, also known as the common beta chain (βc), is a critical component of the high-affinity receptor complex for GM-CSF, interleukin-3 (IL-3), and interleukin-5 (IL-5). This receptor plays a central role in hematopoiesis and immune regulation by mediating the effects of these cytokines on myeloid cells. The βc subunit does not bind ligand directly but is essential for high-affinity binding to cytokines via heterodimerization with α chains and initiation of intracellular signaling cascades upon ligand binding. Upon activation, cytokine binds to its specific α chain, recruiting the βc subunit to form an active heterodimer. This activates JAK2, leading to phosphorylation events that trigger downstream pathways including JAK/STAT, Ras/MAPK, and PI3K, which regulate cell survival, proliferation, differentiation, and immune responses.

Other names

Common beta chainCSF2RBGM-CSFR beta chain

Modulation of myeloid cell function; inhibition of JAK/STAT, MAPK/ERK, or PI3K pathways