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Venous blood platelets decrease during allergen‐induced asthmatic reactions
Author(s) -
MAESTRELLI P.,
BOSCHETTO PIERA,
ZOCCA ELENA,
CRESCIOLI S.,
BAROLDI P.,
MAPP CRISTINA,
FABBRI L. M.
Publication year - 1990
Publication title -
clinical and experimental allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 154
eISSN - 1365-2222
pISSN - 0954-7894
DOI - 10.1111/j.1365-2222.1990.tb02795.x
Subject(s) - bronchoconstriction , methacholine , allergen , platelet , inhalation , immunology , medicine , asthma , allergy , anesthesia , respiratory disease , lung
Summary To determine whether circulating platelets alter during asthmatic reactions induced by allergens, we studied nine subjects previously shown to develop an early or dual asthmatic reaction after inhalation challenge with extracts of house dust mite or grass pollen. In each subject, FEV 1 , circulating platelets and leucocytes were measured before, 15, 30 and 60 min, and 2, 4, 6 and 8 hr after inhalation of allergen and diluent control administered in a single‐blind, randomized fashion. The same procedure was repeated in six of the nine subjects after bronchoconstriction induced by methacholine. Each subject developed an early asthmatic reaction after allergen inhalation challenge, which was followed by a late asthmatic reaction in six subjects and by an equivocal late asthmatic reaction in two of them (fall in FEV 1 of 15 and 17% respectively). Compared with the control day, circulating platelets significantly decreased during the allergen‐induced early asthmatic reaction ( P < 0·025, at 30 min). Platelet counts returned to baseline values within 4 hr and remained steady thereafter both in subjects who did and did not develop a late asthmatic reaction. No changes in platelet counts occurred after bronchoconstriction induced by methacholine. Diurnal increase of leucocyte numbers occurred after challenge with both allergen and diluent control. These results suggest that platelets may be involved in the pathogenesis of allergen‐induced asthmatic reactions.

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