Premium
In vitro effects of ultraviolet A on histamine release from human basophils
Author(s) -
Monfrecola G,
De Paulis A,
Prizio E,
Russo I,
Carfora M,
Santoianni P,
Marone G
Publication year - 2003
Publication title -
journal of the european academy of dermatology and venereology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.655
H-Index - 107
eISSN - 1468-3083
pISSN - 0926-9959
DOI - 10.1046/j.1468-3083.2003.00679.x
Subject(s) - histamine , medicine , in vitro , immunoglobulin e , immunology , psoriasis , human skin , pharmacology , chemistry , antibody , biology , biochemistry , genetics
Background As long‐wave ultraviolet (UV) radiation penetrates the dermis, connective tissue cellular components and circulating blood cells can be possible targets for solar UVA. Basophils, involved in the effector phase of the inflammatory response, play a part in skin diseases such as chronic urticaria, psoriasis, atopic dermatitis, fixed drug eruption, allergic contact dermatitis, urticaria pigmentosa, systemic sclerosis and bullous pemphigoid. Objective The evaluation of the in vitro effect of UVA on histamine release from human basophils. Methods Basophils from healthy human volunteers were irradiated, respectively, with UVA at doses of 2.5, 5, 7.5, 10, 20 and 50 J/cm 2 and then incubated with an anti‐IgE serum. A fluorimetric technique was employed to determine histamine release from samples: (i) incubated with 2% HClO 4 (complete lysis of basophils); (ii) irradiated with increasing doses of UVA; and (iii) unirradiated (controls). Results Histamine release was: 100% for HClO 4 incubated basophils, 30% for unirradiated and anti‐IgE incubated cells (controls) and 27%, 24%, 34%, 41%, 60% and 70% for basophils irradiated with UVA doses, respectively, of 2.5, 5, 7.5, 10, 20 and 50 J/cm 2 and incubated with anti‐IgE. Histamine releasability from irradiated samples was statistically significant ( P < 0.05), in comparison with controls, at UVA doses equal to 5, 10, 20 and 50 J/cm 2 . Conclusions UVA exerts, at least in vitro , a biphasic dose‐dependent action on histamine release from human basophils incubated with an anti‐IgE serum: at the lowest irradiation doses (< 5 J/cm 2 ) it exerts an inhibitory effect and at the highest doses ( 10 J/cm 2 ) histamine release increases significantly.