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. 1995 May;115(1):128–132. doi: 10.1111/j.1476-5381.1995.tb16329.x

Involvement of tachykinins in plasma extravasation induced by bradykinin and low pH medium in the guinea-pig conjunctiva.

M Figini 1, P Javdan 1, F Cioncolini 1, P Geppetti 1
PMCID: PMC1908761  PMID: 7544195

Abstract

1. The effect of bradykinin, capsaicin, substance P and low pH medium on plasma extravasation in the guinea-pig conjunctiva has been studied. Evans blue dye was measured in the conjunctiva after local instillation of the agents into the conjunctival sac. 2. Bradykinin (2-50 nmol), capsaicin (20-50 nmol) and substance P (0.5-5 nmol) caused a dose-dependent increase in plasma extravasation with the following order of potency: substance P > bradykinin = capsaicin. The effect of capsaicin (50 nmol) and substance P (5 nmol) was abolished by the tachykinin NK1 receptor antagonist, CP-99,994 (8 mumol kg-1, i.v.) (P < 0.01), whereas CP-100,263 (8 mumol kg-1, i.v.) the inactive enantiomer of CP-99,994 was without effect. CP-99,994 inhibited by 70% (P < 0.01) the effect of bradykinin. 3. The kinin B2 receptor antagonist, Hoe 140 (icatibant, 10 nmol kg-1, i.v.) abolished the response to bradykinin (50 nmol) (P < 0.01), but did not affect the responses to capsaicin (50 nmol) or substance P (5 nmol). Plasma extravasation induced by low pH medium (pH 1) was abolished by CP-99,994 (P < 0.01) and by Hoe 140 (P < 0.01). 4. The present findings suggest that: endogenous or exogenous tachykinins increase plasma extravasation in the guinea-pig conjunctiva by activation of NK1 receptors; bradykinin-induced plasma extravasation is mediated by tachykinin release from sensory nerve endings; low pH media cause plasma extravasation via release of kinins that by activation of B2 receptors release tachykinins from sensory nerve endings.

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Selected References

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