Bradykinin receptor B₂ polyclonal antibody

Bradykinin (BK) is a nine-amino acid peptide produced by kallikrein cleavage of kininogen precursor proteins in tissue and plasma, and is an important regulator of vascular and pain responses to tissue injury. Two receptors (B1 and B2) have been identified as mediators of BK signaling, and are both seven-transmembrane domain-containing GPCRs. The B2 receptor is constitutively expressed in smooth muscle and neurons, whereas B1 expression is induced following injury. B2 receptors signal via Gq alpha subunits, leading to activation of phospholipase Cbeta, hydrolysis of PI, and an intracellular increase in free calcium, although coupling through Gi, Gs, and G12/13 has also been observed.