Interactions between the tachykinins and calcitonin gene-related peptide lead to the modulation of oedema formation and blood flow in rat skin (original) (raw)

Abstract

1. The mechanisms involved in tachykinin-induced oedema were investigated in rat skin and interactions between the tachykinins and calcitonin gene-related peptide (CGRP) were studied. 2. Intradermal injections of the tachykinins, substance P, neurokinin A and neurokinin B, stimulated local oedema formation which was in each case potentiated by co-injection of the vasodilator CGRP. Oedema induced by substance P, in the presence and absence of CGRP, was significantly inhibited by pretreatment of rats with a combination of the histamine H1 antagonist, mepyramine, and the 5-hydroxytryptamine antagonist, methysergide. Oedema induced by neurokinin A or B was not inhibited by this pretreatment. 3. Intradermally-injected CGRP induced a long lasting increase in local blood flow, which was measured with a laser Doppler blood flow meter. The simultaneous injection of substance P, but not of the structurally-related neurokinins, caused a loss of the prolonged vasodilator activity of CGRP. 4. These results show that oedema induced by substance P is partially dependent on mast cell amines and that only substance P causes a loss of the prolonged vasodilator activity of CGRP. 5. We suggest that the ability of substance P to prevent the persistent vasodilator activity of CGRP may be a direct consequence of substance P-induced activation of mast cells.

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Selected References

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