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Substance P(1-7) TFA is a fragment of the neuropeptide, substance P (SP). Substance P(1-7) TFA gives depressor and bradycardic effects when applied to the nucleus tractus solitarius[1]. | [in vivo]
Substance P(1-7) is found to act as a very potent antagonist against the SP-induced responses and is formed locally in the nigra after SP injection. It is proposed that Substance P(1-7) is an endogenous modulator of SP actions[1]. Injection of low doses of Substance P(1-7) (1.0-4.0 pM simultaneously with SP or SP(5-11) (0.1 nM), reduce aversive behaviours induced by SP or SP(5- 11) significantly. These results indicate that SP(1-7) formed endogenously could modulate the actions of SP or SP(5-11) in the spinal cord[2]. | [References]
[1] Herrera-Marschitz M, et al. The substance P(1-7) fragment is a potent modulator of substance P actions in the brain. Brain Res. 1990 Jun 25;521(1-2):316-20. DOI:10.1016/0006-8993(90)91558-x
[2] Sakurada T, et al. Substance P(1-7) antagonizes substance P-induced aversive behaviour in mice. Neurosci Lett. 1988 Dec 19;95(1-3):281-5. DOI:10.1016/0304-3940(88)90671-4 |
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