IL-1R1 (CD121a) belongs to IL-1 receptor, and binds to IL-1α, IL-1β, IL-1Ra and IL-38 with comparable affinities (Kd: 0.1-1 nM) [1]. IL-1R1 regulates the transcription of multiple proinflammatory cytokines and mediates immune and inflammatory responses, including the activation of NF-κB and MAPK pathway[4]. IL-1R1 Protein, Human (HEK293, Fc) is a recombinant human extracellular region of IL-1R1 (M1-T332) with a C-Terminal hFc tag, which is produced in HEK293 cells.
