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bradykinin receptor B1
Identifiers
Symbol BDKRB1
Entrez 623
HUGO 1029
OMIM 600337
RefSeq NM_000710
UniProt P46663
Other data
Locus Chr. 14 q32.1-32.2
bradykinin receptor B2
Identifiers
Symbol BDKRB2
Entrez 624
HUGO 1030
OMIM 113503
RefSeq NM_000623
UniProt P30411
Other data
Locus Chr. 14 q32.1-32.2

The bradykinin receptor family is a group of G-protein coupled receptors whose principal ligand is the protein bradykinin.

There are two Bradykinin receptors: the B1 receptor and the B2 receptor.[1]

Contents

B1 receptor

Bradykinin receptor B1 (B1) is a G-protein coupled receptor encoded by the BDKRB1 gene in humans. Its principal ligand is bradykinin, a 9 amino acid peptide generated in pathophysiologic conditions such as inflammation, trauma, burns, shock, and allergy. The B1 receptor is one of two of G protein-coupled receptors that have been found which bind bradykinin and mediate responses to these pathophysiologic conditions.

B1 protein is synthesized de novo following tissue injury and receptor binding leads to an increase in the cytosolic calcium ion concentration, ultimately resulting in chronic and acute inflammatory responses.

B2 receptor

The B2 receptor is a G protein-coupled receptor, coupled to Gq and Gi. Gq stimulates phospholipase C to increase intracellular free calcium and Gi inhibits adenylate cyclase. Furthermore, the receptor stimulates the mitogen-activated protein kinase pathways. It is ubiquitously and constitutively expressed in healthy tissues.

The B2 receptor forms a complex with angiotensin converting enzyme (ACE), and this is thought to play a role in cross-talk between the renin-angiotensin system (RAS) and the kinin-kallikrein system (KKS). The heptapeptide angiotensin 1-7 (A1-7) also potentiates bradykinin action on B2 receptors.[2]

Ictibant is a second generation B2 receptor antagonist which has undergone limited clinical trials in pain and inflammation.

Kallidin also signals through the B2 receptor.

References

  1. ^ Leeb-Lundberg LM, Marceau F, Müller-Esterl W, Pettibone DJ, Zuraw BL (2005). "International union of pharmacology. XLV. Classification of the kinin receptor family: from molecular mechanisms to pathophysiological consequences". Pharmacol. Rev. 57 (1): 27–77. doi:10.1124/pr.57.1.2. PMID 15734727.  
  2. ^ Fernandes L, Fortes ZB, Nigro D, Tostes RC, Santos RA, Catelli De Carvalho MH (2001). "Potentiation of bradykinin by angiotensin-(1-7) on arterioles of spontaneously hypertensive rats studied in vivo". Hypertension 37 (2 Part 2): 703–9. PMID 11230360. http://hyper.ahajournals.org/cgi/content/abstract/37/2/703.  

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