|External IDs||GeneCards: |
3D model (JSmol)
|ECHA InfoCard||Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value). Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value).|
|Molar mass||1388.6 g/mol|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Urotensin-II (U-II) is a peptide ligand that is the strongest known vasoconstrictor. Because of the involvement of the UII system in multiple biological systems such as the cardiovascular, nervous, endocrine, and renal, it represents a promising target for the development of new drugs.
In humans, Urotensin-2 is encoded by the UTS2 gene.
U-II was initially isolated from the neurosecretory system of the Goby fish (Gillichthys mirabilis). For many years it was thought that U-II does not exhibit significant effects in mammalian systems; a view quickly overturned when it was demonstrated that Goby U-II produces slow relaxation of mouse anococcygeus muscle, in addition to contraction of rat artery segments. In 1998, the genes for Pre-pro U-II were found in mammals proving that the peptide U-II did exist in mammals.
The U-II gene is located on chromosome 1p36. U-II peptide length varies between species due to the specific cleaving sites located at different spots depending on the species. In humans U-II length is 11 amino acids. The peptide sequence that is needed for biological function for both U-II and urotensin II-Related Peptide (URP) is known as the core. It is hexapeptide (-CYS-TYR-LYS-TRP-PHE-CYS-), and is connected at the two ends by a disulfide bond. Also just like URP the amino terminus can be modified without any loss in pharmacological activity suggesting that it is not needed for activation of the receptor. Unlike URP, U-II has an acidic amino acid (Glutamic or Aspartic) that precedes the core sequence. While the amino acid isn’t necessary for the activation of urotensin II receptor the fact that it is conserved in different species suggests that it has a biological function that has not been discovered.
U-II is an agonist for the urotensin-II receptor which is a G protein-coupled receptor that primarily activates the alpha subunit Gαq11. It activates PKC which then activates PLC which increases the intercellular calcium concentration. It is found in many peripheral tissues, blood vessels, and also the brainstem cholinergic neurons of the laterodorsal tegmental (LDT) and the pedunculopontine tegmental nuclei (PPT). It is also found in rat astrocytes.
Pre-pro U-II in both humans and rats are primarily expressed in the motorneurons of the brainstem and spinal cord although it is also found in small amounts in other parts of the brain as well including the frontal lobe and the medulla oblongata. In humans U-II mRNA is also found in other peripheral tissues such as the heart, kidneys, adrenal gland, placenta, spleen, and thymus.
Central nervous system
When injected intracerebroventricularly (icv) U-II causes an increase in the corticotropin releasing factor by activating the hypothalamic paraventricular neurons. This leads to increased plasma levels of adrenocorticotropic hormones and adrenaline. Rats and mice exhibit many stress related behaviors when injected with U-II which were tested by the elevated plus maze which measures anxiety-like effects,and the hole-board test which measures head dipping which is also an anxiety-like behavior.
U-II when injected icv in rats also leads to cardiovascular responses including raising mean arterial pressure (MAP) and causing tachycardia. When the arcuate nucleus, and the paraventricular nucleus, two different areas of the brain which are known to control blood pressure were injected with U-II simultaneously they caused an increase in blood pressure. When the two areas were injected separately it was discovered that U-II affected the excitatory neurons in the paraventricular nucleus and the inhibitory neurons of the arcuate nucleus.
U-II when injected icv in both rats and mice also stimulates locomotion in familiar environments. This experiment was also tested in rainbow trout (Oncorhynchus mykiss) where a stimulatory effect was also observed..
Depression-like behavior was also observed when U-II was injected in the brain by using the forced swim test and the tail suspension test which are used to compare molecules that are thought to cause anti-depressive-like effects.
Orexigenic behavior which is increased appetite and thirst were also observed after icv injection of U-II in rats.
Peripheral tissue effects
U-II has a variety of effects on different tissues. In blood vessels it can cause contraction. In rat pancreas U-II inhibits insulin secretion. It also affects the kidneys including sodium transport, lipid and glucose metabolism, and natriuretic effects. Its has been linked to cardiac fibrosis and hypertrophy, heart failure, renal dysfunction, and diabetes.
- ↑ Clozel M, Binkert C, Birker-Robaczewska M, Boukhadra C, Ding SS, Fischli W, Hess P, Mathys B, Morrison K, Müller C, Müller C, Nayler O, Qiu C, Rey M, Scherz MW, Velker J, Weller T, Xi JF, Ziltener P (Oct 2004). "Pharmacology of the urotensin-II receptor antagonist palosuran (ACT-058362; 1-[2-(4-benzyl-4-hydroxy-piperidin-1-yl)-ethyl]-3-(2-methyl-quinolin-4-yl)-urea sulfate salt): first demonstration of a pathophysiological role of the urotensin System". (primary). The Journal of Pharmacology and Experimental Therapeutics. 311 (1): 204–12. doi:10.1124/jpet.104.068320. PMID 15146030.
- ↑ Douglas SA, Dhanak D, Johns DG (Feb 2004). "From 'gills to pills': urotensin-II as a regulator of mammalian cardiorenal function". (review). Trends in Pharmacological Sciences. 25 (2): 76–85. doi:10.1016/j.tips.2003.12.005. PMID 15102493.
- ↑ Vaudry H, Do Rego JC, Le Mevel JC, Chatenet D, Tostivint H, Fournier A, Tonon MC, Pelletier G, Conlon JM, Leprince J (2010). "Urotensin II, from fish to human". (review). Annals of the New York Academy of Sciences. 1200: 53–66. doi:10.1111/j.1749-6632.2010.05514.x. PMID 20633133.
- ↑ Vaudry H, Leprince J, Chatenet D, Fournier A, Lambert DG, Le Mével JC, Ohlstein EH, Schwertani A, Tostivint H, Vaudry D (2015). "International Union of Basic and Clinical Pharmacology. XCII. Urotensin II, urotensin II-related peptide, and their receptor: from structure to function". (review). Pharmacological Reviews. 67 (1): 214–58. doi:10.1124/pr.114.009480. PMID 25535277.
- ↑ Leprince J, Chatenet D, Dubessy C, Fournier A, Pfeiffer B, Scalbert E, Renard P, Pacaud P, Oulyadi H, Ségalas-Milazzo I, Guilhaudis L, Davoust D, Tonon MC, Vaudry H (May 2008). "Structure-activity relationships of urotensin II and URP". (review). Peptides. 29 (5): 658–73. doi:10.1016/j.peptides.2007.08.014. PMID 17931747.
- ↑ Coulouarn Y, Lihrmann I, Jegou S, Anouar Y, Tostivint H, Beauvillain JC, Conlon JM, Bern HA, Vaudry H (Dec 1998). "Cloning of the cDNA encoding the urotensin II precursor in frog and human reveals intense expression of the urotensin II gene in motoneurons of the spinal cord". Proceedings of the National Academy of Sciences of the United States of America. 95 (26): 15803–8. doi:10.1073/pnas.95.26.15803. PMC 28125. PMID 9861051.
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- ↑ "Entrez Gene: UTS2 urotensin 2".
- ↑ Bern HA, Lederis K (Sep 1969). "A reference preparation for the study of active substances in the caudal neurosecretory system of teleosts". (primary). The Journal of Endocrinology. 45 (1): Suppl:xi-xii. PMID 5347394.
- ↑ 10.0 10.1 Nothacker HP, Clark S (Nov 2005). "From heart to mind. The urotensin II system and its evolving neurophysiological role". (review). The FEBS Journal. 272 (22): 5694–702. doi:10.1111/j.1742-4658.2005.04983.x. PMID 16279935.
- ↑ 11.0 11.1 Sugo T, Murakami Y, Shimomura Y, Harada M, Abe M, Ishibashi Y, Kitada C, Miyajima N, Suzuki N, Mori M, Fujino M (Oct 2003). "Identification of urotensin II-related peptide as the urotensin II-immunoreactive molecule in the rat brain". (review). Biochemical and Biophysical Research Communications. 310 (3): 860–8. doi:10.1016/j.bbrc.2003.09.102. PMID 14550283.
- ↑ Clark SD, Nothacker HP, Wang Z, Saito Y, Leslie FM, Civelli O (Dec 2001). "The urotensin II receptor is expressed in the cholinergic mesopontine tegmentum of the rat". (review). Brain Research. 923 (1–2): 120–7. doi:10.1016/s0006-8993(01)03208-5. PMID 11743979.
- ↑ Castel H, Diallo M, Chatenet D, Leprince J, Desrues L, Schouft MT, Fontaine M, Dubessy C, Lihrmann I, Scalbert E, Malagon M, Vaudry H, Tonon MC, Gandolfo P (Oct 2006). "Biochemical and functional characterization of high-affinity urotensin II receptors in rat cortical astrocytes". (primary). Journal of Neurochemistry. 99 (2): 582–95. doi:10.1111/j.1471-4159.2006.04130.x. PMID 16942596.
- ↑ 14.0 14.1 14.2 14.3 do Rego JC, Leprince J, Scalbert E, Vaudry H, Costentin J (May 2008). "Behavioral actions of urotensin-II". (review). Peptides. 29 (5): 838–44. doi:10.1016/j.peptides.2007.12.016. PMID 18294732.
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