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Archives of Dermatological Research

, Volume 274, Issue 1–2, pp 29–37 | Cite as

Potentiation of histamine-induced itch and flare responses in human skin by the enkephalin analogue FK 33-824, β-endorphin and morphine

  • B. Fjellner
  • Ö. Hägermark
Original Contributions

Summary

The effect of various opioid or putative neurotransmitter peptides on histamine-induced itch and flare responses was studied in humans after intradermal injection. Significant enhancement of the histamine responses was induced by the stable methionine-enkephalin analogue FK 33-824, β-endorphin and morphine. The putative neurotransmitters substance P and vasoactive intestinal polypeptide (VIP) — which moreover are potent histamine liberators — had no enhancing effect. The potentiation induced by FK 33-824 was induced neither by local pretreatment with Compound 48/80 to deplete the local stores of mast-cell-bound histamine, nor by oral pretreatment with indomethacin to inhibit prostaglandin formation in the skin. Thus, the enhancement did not seem to be due to histamine release or to prostaglandin formation and the mechanism of the effect remains to be shown. The specific morphine antagonist naloxone did not inhibit the potentiation by FK 33-824, which might indicate that ordinary opiate receptors were not involved. The results support the idea that pain and itch are qualitatively separate processes, and suggest possible mechanisms of morphine-induced pruritus. The findings are of particular interest in view of recent reports on the presence of methionineenkephalin in Merkel cells.

Key words

Pruritus Histamine Opioid peptides Morphine 

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • B. Fjellner
    • 1
  • Ö. Hägermark
    • 1
  1. 1.Department of DermatologyKarolinska HospitalStockholmSweden

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