Immunohistochemical detection of human basophils in late-phase skin reactions

The Journal of Allergy and Clinical Immunology
A M IraniL B Schwartz

Abstract

Human basophils are difficult to detect with classic histochemical stains at sites of allergic inflammation. The 2D7 anti-basophil monoclonal antibody was used to identify basophils in skin during the late-phase response to a cutaneous allergen challenge. The 2D7 monoclonal antibody was used on protease-digested sections of skin biopsy specimens obtained 6 and 24 hours after an allergen or buffer challenge. The skin chamber technique was used to compare buffer- and allergen-challenged sites at 6 hours, and intradermal injection of allergen was used to compare allergen-challenged sites at 6 and 24 hours. Dramatic increases in the numbers of 2D7+ cells and in tissue staining by 2D7 were observed 6 hours after allergen challenge compared with buffer challenge. Histamine levels in skin chamber fluid varied with 2D7+ cell concentrations. By 24 hours, 2D7+ cells and tissue staining appeared to diminish but were still detectable in the allergen-challenged sites. Basophils localized primarily in and around blood vessels, whereas mast cells remained mostly in the superficial dermis. Mast cells were 2D7- in both the allergen- and buffer-challenged skin. Metachromatic staining of 2D7+ basophils with toluidine blue was absent in these tiss...Continue Reading

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