Neurokinin A
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Neurokinin A

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Neurokinin A is a member of the endogenous tachykinin agonist with preference for the NK-2R (NK-2 receptor).

Peptide Inhibitors
Catalog number
CAS number
Molecular Formula
Molecular Weight
Neurokinin A
(3S)-3-[[(2S,3R)-2-[[(2S)-6-amino-2-[[(2S)-2-amino-3-(1H-imidazol-5-yl)propanoyl]amino]hexanoyl]amino]-3-hydroxybutanoyl]amino]-4-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[2-[[(2S)-1-[[(2S)-1-amino-4-methylsulfanyl-1-oxobutan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-2-oxoethyl]amino]-3-methyl-1-oxobutan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-4-oxobutanoic acid
Neurokinin A; Substance K; Neuromedin L; H-D-His-D-Lys-Thr-Asp-D-Ser-Phe-D-Val-Gly-D-Leu-D-Met-NH2
White to Off-white Powder
≥97% by HPLC
1.305±0.06 g/cm3
Boiling Point
Store at -20°C
Soluble in Water
InChI Key
Canonical SMILES
1. Comparison of Neurokinin A, Substance P, Interleukin 8, and Matrix Metalloproteinase-8 Changes in Pulp tissue and Gingival Crevicular Fluid Samples of Healthy and Symptomatic Irreversible Pulpitis Teeth
Gozde Akbal Dincer, Ucler Kisa, Ali Erdemir J Endod . 2020 Oct;46(10):1428-1437. doi: 10.1016/j.joen.2020.07.013.
Introdution:The aim of this study was to compare levels of neurokinin A (NKA), substance P (SP), interleukin (IL)-8, and matrix metalloproteinase-8 (MMP-8) in pulp tissue and gingival crevicular fluid (GCF) samples of healthy and symptomatic irreversible pulpitis teeth.Methods:Forty patients diagnosed with healthy and symptomatic irreversible pulpitis teeth were included in this study. NKA, SP, IL-8, and MMP-8 levels were measured using the enzyme-linked immunosorbent assay test after pulp and GCF samples were obtained from healthy (n = 20) and symptomatic irreversible pulpitis teeth (n = 20). GCF sampling of 40 teeth was repeated 1 week later. Routine root canal treatment procedures of the teeth were performed, and the treatment process was completed. As a control group, GCF samples were taken from the contralateral teeth in both groups. Statistical analysis was performed using dependent and independent t tests, analysis of variance, Kruskal-Wallis, Mann-Whitney U tests, and Pearson correlation analysis.Results:Comparing the groups, all mediator levels were significantly higher in the pulp samples in the pulpitis group compared with the healthy group (NKA: P < .001, SP: P = .005, IL-8: P < .001, and MMP-8: P < .001). Likewise, in the pulpitis group, all mediator levels were significantly higher in the first GCF samples compared with the healthy group (NKA: P = .01, SP: P < .001, IL-8: P = .001, and MMP-8: P < .001).Conclusions:It was observed that NKA, SP, IL-8, and MMP-8 increased significantly in pulp tissue and GCF specimens of symptomatic irreversible pulpitis teeth compared with pulp tissue and GCF specimens of healthy teeth. Second, it was determined that NKA, SP, IL-8, and MMP-8 levels decreased significantly in GCF samples in teeth diagnosed with symptomatic irreversible pulpitis 1 week after the removal of inflamed pulp. Finally, SP, IL-8, and MMP-8 levels were found to be higher in pulp tissue samples of the patients with symptomatic irreversible pulpitis with higher pain scores than those with low pain scores.
2. Neurokinin A and B
E Munekata Comp Biochem Physiol C Comp Pharmacol Toxicol . 1991;98(1):171-9.
The chemical features, pharmacological and biochemical characteristics of novel mammalian tachykinin peptides, neurokinin A and neurokinin B are described and are compared with those of substance P, a representative of tachykinin family.
3. Neurokinin A. A pharmacological study
G Drapeau, N E Rhaleb, S Dion, N Rouissi, C Tousignant, D Jukic, D Regoli Pharmacol Res . 1990 Jan-Feb;22(1):1-14. doi: 10.1016/1043-6618(90)90738-y.
Discovered in 1983, the decapeptide neurokinin A has been shown to occur in several peripheral organs and to exert a variety of biological effects. In this article, we review the most sensitive and selective in vivo and in vitro tests which have been used in various laboratories to evaluate naturally occurring or synthetic neurokinin A. A comparison of the effects of neurokinin A and those of its mammalian homologues, substance P and neurokinin B as well as those of tachykinins and related peptides is presented in the frame of a study directed toward characterization of neurokinin receptors. Indeed, neurokinin A has been shown to be particularly active on a neurokinin receptor subtype, the NK-2. Structure-activity studies performed with neurokinin A and its fragments as well as with several analogues of both the decapeptide and the heptapeptide NKA(4-10) have brought to the identification of the minimum structure required for activation of NK-2 receptors. Selective agonists for this receptor have been identified, in particular [Nle10]-NKA(4-10) and [beta-Ala8]-NKA(4-10).
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