Tachykinin Receptors

The tachykinin peptides constitute one of the largest peptide families. To date, more than 40 tachykinins have been identified from invertebrate and vertebrate species. In mammals, three prototypical tachykinins have been isolated from neuronal tissue: substance P, neurokinin A and neurokinin B. Recently hemokinin-1 has been isolated from murine blood cells and identified as a new endogenous tachykinin. Three main tachykinin receptor types have been identified: NK1, NK2 and NK3 receptors.

Tachykinin Receptor Target Files

Related Categories
Receptor Subtype NK1 NK2 NK3
Transduction Mechanism Activates Gq/11 Activates Gq/11 Activates Gq/11
Localization CNS (particularly the striatum, amygdala and some hypothalamic and thalamic nuclei), peripheral tissues Periphery (inflammatory cells and bronchial, gastrointestinal and urinary smooth muscle), limited expression in the CNS CNS (hippocampus, hypothalamus, substantia nigra, dorsal horn of the spinal cord), limited expression in the periphery
Preferred Endogenous Ligand Substance P (1156) > Neurokinin A (1152) > Neurokinin B (1582) Neurokinin A (1152) > Neurokinin B (1582) > Substance P (1156) Neurokinin B (1582) > Neurokinin A (1152) > Substance P (1156)
Selective Agonists GR 73632 (1669)
Hemokinin-1 (mouse) (1535)
[Sar9,Met(O2)11]-Substance P (1178)
Hemokinin-1 (human) (2576)
GR 64349 (1668)
[bAla8]-Neurokinin A(4-10) (1640)
[Lys5,MeLeu9,Nle10]-NKA(4-10) (3228)
Senktide (1068)
Selective Antagonists FK 888 (2400)
GR 82334 (1670)
L-732,138 (0868)
L-733,060 (1145)
RP 67580 (1635)
SDZ NKT 343 (2394)
GR 159897 (1274)
MDL 29,913 (1194)
MEN 10376 (1632)
MEN 10627
SB 218795 (1376)
SB 222200 (1393)

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