– Interleukin-10 Receptor alpha (IL-10 R alpha), also known as IL-10 R1, is transmembrane glycoprotein member of the class II cytokine receptor family. Interleukin-10 (IL10) is a key anti-inflammatory cytokine that is produced predominantly by leukocytes including T cells, B cells, monocytes, macrophages, and dendritic cells (DCs), as well as by some epithelial cells. The receptor for IL10 is a heterotetramer complex comprising two IL10Ra (also referred to as IL10R1) molecules and two IL10Rb (also referred to as IL10R2) molecules.IL10Ra is expressed on most hematopoietic cells at a basal level but is upregulated by various cells upon activation, suggesting its importance in inhibitory pathways.