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Review
. 2004 Jul;61(13):1652-63.
doi: 10.1007/s00018-004-4035-x.

Hemokinins and endokinins

N M Page  1
Affiliations
Review

Hemokinins and endokinins

N M Page. Cell Mol Life Sci. 2004 Jul.

Abstract

The mammalian tachykinins are a family of peptides that, until recently, has included substance P (SP), neurokinin A and neurokinin B. Since, the discovery of a third preprotachykinin gene ( TAC4), the number of tachykinins has more than doubled to reveal several species-divergent peptides. This group includes hemokinin-1 (HK-1) in mouse and rat, endokinin-1 (EK-1) in rabbit, and EKA, EKB, human HK-1 (hHK-1) and hHK(4-11) in humans. Each exhibits a remarkable selectivity and potency for the tachykinin NK(1) receptor similar to SP. Their peripheral expression has led to the proposal that they are the endogenous peripheral SP-like endocrine/paracrine agonists where SP is not expressed. Moreover, their strong cross-reactivity with a specific SP antibody leads us to question many of the proposed locations and roles of SP in the periphery. Additionally, three orphan tachykinin gene-related peptides are identified on TAC4, in rabbit, EK-2 and in humans, EKC and EKD.

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