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1The 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, [fl-Ala4, Sar9, Met (02) 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.

The radiological manifestations of an unusual spondyloepiphyseal dysplasia have been observed in a girl. A peculiar epi-metaphyseal involvement that is "cone shaped epiphyses" appears to be the major feature.

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