The pattern and kinetics in human skin of erythema and mediators during the acute and late-phase response (LPR).

The Journal of Allergy and Clinical Immunology
A ReshefP S Norman

Abstract

To investigate the kinetics and pattern of allergenically induced mediator release in the human skin, we have studied 24 ragweed- and grass-allergic patients with a blister-chamber technique. Chambers sealed to the skin around a denuded area, formed by unroofing a blister, were challenged with 0.5 ml of either diluent or 10 or 100 times the concentration of allergen required for 4+ early intradermal reaction. Chamber fluids were removed hourly 1 to 8 hours after antigen challenge and examined for the presence of histamine, leukotriene C4 (LTC4), and prostaglandin D2 to compare inflammatory mediator levels with the clinical early response and late-phase response (LPR), as assessed by erythema around the chamber. An initial erythema developed rapidly and began to subside after 1 hour in all patients, but a late-phase local erythema and subcutaneous swelling around the chamber (i.e., greater than 2.5 cm, the outside diameter of the chamber) developed in 13/15 challenges only when the higher concentration of antigen was used. At both allergen concentrations, histamine levels peaked sharply at the first hour (20.6 +/- 2.3 ng/ml) and progressively declined during the next 4 hours by 75%, but remained above control levels for at least...Continue Reading

Citations

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