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. 1990 May;100(1):11–14. doi: 10.1111/j.1476-5381.1990.tb12043.x

NK1-receptors mediate the proliferative response of human fibroblasts to tachykinins.

M Ziche 1, L Morbidelli 1, M Pacini 1, P Dolara 1, C A Maggi 1
PMCID: PMC1917450  PMID: 1695530

Abstract

1. The effect of synthetic tachykinin selective receptor agonists was studied on the growth of cultured human skin fibroblasts (HF). 2. Human fibroblasts were grown in serum-free conditions in the presence of natural tachykinins (substance P and neurokinin A) and of three synthetic agonists, [beta-Ala4, Sar9, Met(O2)11]-SP(4-11), [beta-Ala8]-NKA(4-10) and [MePhe7]-NKB selective for NK1-, NK2- and NK3-receptors respectively. Cell proliferation was measured by percentage increase in cell number and by [3H]-thymidine uptake following 48 h exposure to agents compared to baseline condition. 3. Neurokinin A (NKA) and substance P (SP) significantly increased cell proliferation the threshold concentrations being 10(-12) and 10(-11) M, respectively. Addition of thiorphan to culture conditions enhanced the effect of SP but not of NKA. 4. The selective NK1-receptor agonist produced a dose-dependent increase in cell proliferation as judged by total cell number and [3H]-thymidine uptake. No significant effect was observed with NK2- and NK3-receptor agonists. 5. These data indicate that the effect of SP on fibroblast proliferation is mediated by interaction with a NK1-receptor type and local metabolism can interfere with the full expression of this effect of SP on cell proliferation.

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Selected References

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