|Jmol-3D images||Image 1|
|Molar mass||1060.21 g/mol|
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
|Alt. symbols||KNG, BDK|
|Locus||Chr. 3 q21-qter|
Bradykinin is a peptide that causes blood vessels to dilate (enlarge), and therefore causes blood pressure to lower. A class of drugs called ACE inhibitors, which are used to lower blood pressure, increase bradykinin (by inhibiting its degradation) further lowering blood pressure. Bradykinin works on blood vessels through the release of prostacyclin, nitric oxide, and Endothelium-Derived Hyperpolarizing Factor.
In humans, bradykinin is broken down by three kininases: angiotensin-converting enzyme (ACE), aminopeptidase P (APP), and carboxypeptidase N (CPN), which cleave the 7-8, 1-2, and 8-9 positions, respectively.
Physiological Role (Function) 
Bradykinin is a potent endothelium-dependent vasodilator, causes dilation of non-vascular smooth muscle, increases vascular permeability and also is involved in the mechanism of pain. Bradykinin also causes natriuresis, contributing to a drop in blood pressure.
Bradykinin is also thought to be the cause of the dry cough in some patients on angiotensin converting enzyme (ACE) inhibitor drugs. It is thought that bradykinin is converted to inactive metabolites by angiotensin converting enzyme (ACE), therefore inhibition of this enzyme leads to increased levels of bradykinin which causes a dry cough. This refractory cough is a common cause for stopping ACE inhibitor therapy. In which case angiotensin II receptor antagonists (ARBs) are the next line of treatment.
Initial secretion of bradykinin post-natally causes constriction and eventual atrophy of the ductus arteriosus, forming the ligamentum arteriosum between the pulmonary trunk and aortic arch.
- The B1 receptor (also called bradykinin receptor B1) is expressed only as a result of tissue injury, and is presumed to play a role in chronic pain. This receptor has been also described to play a role in inflammation. Most recently, it has been shown that the kinin B1 receptor recruits neutrophil via the chemokine CXCL5 production. Moreover, endothelial cells have been described as a potential source for this B1 receptor-CXCL5 pathway.
- The B2 receptor is constitutively expressed and participates in bradykinin's vasodilatory role.
The kinin B1 and B2 receptors belong to G protein coupled receptor (GPCR) family.
Bradykinin was discovered in 1948 by three Brazilian physiologists and pharmacologists working at the Instituto Biológico, in São Paulo, Brazil, led by Dr. Maurício Rocha e Silva. Together with colleagues Wilson Teixeira Beraldo and Gastão Rosenfeld, they discovered the powerful hypotensive effects of bradykinin in animal preparations. Bradykinin was detected in the blood plasma of animals after the addition of venom extracted from the Bothrops jararaca (Brazilian lancehead snake), brought by Rosenfeld from the Butantan Institute. The discovery was part of a continuing study on circulatory shock and proteolytic enzymes related to the toxicology of snake bites, started by Rocha e Silva as early as 1939. Bradykinin was to prove a new autopharmacological principle, i.e., a substance that is released in the body by a metabolic modification from precursors, which are pharmacologically active. According to B.J. Hagwood, Rocha e Silva's biographer, "The discovery of bradykinin has led to a new understanding of many physiological and pathological phenomena including circulatory shock induced by venoms and toxins." Etymology: brady [Gk] slow, kinin [Gk ] kīn(eîn) to move, set in motion, ? from the effect of snake venom on intestinal smooth muscle, which was noted to slowly contract.
Therapeutic Implications 
The practical importance of the discovery of bradykinin became apparent when one of his collaborators at the Medical School of Ribeirão Preto at the University of São Paulo, Dr. Sérgio Henrique Ferreira, discovered a bradykinin potentiating factor (BPF) in the bothropic venom which increases powerfully both the duration and magnitude of its effects on vasodilation and the consequent fall in blood pressure. On the basis of this finding, Squibb scientists developed the first of a new generation of highly-effective anti-hypertensive drugs, the so-called ACE inhibitors, such as captopril (trademarked Capoten).
Currently, bradykinin inhibitors (antagonists) are being developed as potential therapies for hereditary angioedema. Icatibant is one such inhibitor. Additional bradykinin inhibitors exist. It has long been known in animal studies that bromelain, a substance obtained from the stems and leaves of the pineapple plant, suppresses trauma-induced swelling caused by the release of bradykinin into the bloodstream and tissues. Other substances that act as bradykinin inhibitors include aloe and polyphenols, substances found in red wine and green tea.
See also 
- Dendorfer A, Wolfrum S, Wagemann M, Qadri F, Dominiak P (May 2001). "Pathways of bradykinin degradation in blood and plasma of normotensive and hypertensive rats". Am. J. Physiol. Heart Circ. Physiol. 280 (5): H2182–8. PMID 11299220.
- Kuoppala A, Lindstedt KA, Saarinen J, Kovanen PT, Kokkonen JO (April 2000). "Inactivation of bradykinin by angiotensin-converting enzyme and by carboxypeptidase N in human plasma". Am. J. Physiol. Heart Circ. Physiol. 278 (4): H1069–74. PMID 10749699.
- Parpura V, Basarsky TA, Liu F, Jeftinija K, Jeftinija S, Haydon PG (June 1994). "Glutamate-mediated astrocyte-neuron signalling". Nature 369 (6483): 744–7. doi:10.1038/369744a0. PMID 7911978.
- Bas M, Adams V, Suvorava T, Niehues T, Hoffmann TK, Kojda G (August 2007). "Nonallergic angioedema: role of bradykinin". Allergy 62 (8): 842–56. doi:10.1111/j.1398-9995.2007.01427.x. PMID 17620062.
- McLean PG, Ahluwalia A, Perretti M (August 2000). "Association between Kinin B1 Receptor Expression and Leukocyte Trafficking across Mouse Mesenteric Postcapillary Venules". J. Exp. Med. 192 (3): 367–80. doi:10.1084/jem.192.3.367. PMC 2193221. PMID 10934225.
- Duchene J, Lecomte F, Ahmed S, Cayla C, Pesquero J, Bader M, Perretti M, Ahluwalia A (October 2007). "A novel inflammatory pathway involved in leukocyte recruitment: role for the kinin B1 receptor and the chemokine CXCL5". J. Immunol. 179 (7): 4849–56. PMID 17878384.
- Lotz-Winter H (June 1990). "On the pharmacology of bromelain: an update with special regard to animal studies on dose-dependent effects". Planta Med. 56 (3): 249–53. doi:10.1055/s-2006-960949. PMID 2203073.
- Bautista-Pérez R, Segura-Cobos D, Vázquez-Cruz B (July 2004). "In vitro antibradykinin activity of Aloe barbadensis gel". J Ethnopharmacol 93 (1): 89–92. doi:10.1016/j.jep.2004.03.030. PMID 15182910.
- Yagi A, Harada N, Yamada H, Iwadare S, Nishioka I (October 1982). "Antibradykinin active material in Aloe saponaria". J Pharm Sci 71 (10): 1172–4. doi:10.1002/jps.2600711024. PMID 7143219.
- Richard T, Delaunay JC, Mérillon JM, Monti JP (December 2003). "Is the C-terminal region of bradykinin the binding site of polyphenols?". J. Biomol. Struct. Dyn. 21 (3): 379–85. PMID 14616033.