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The Journal of Immunology, 2000, 164: 589-595.
Copyright © 2000 by The American Association of Immunologists

HIV-1 gp120 Induces IL-4 and IL-13 Release from Human Fc{epsilon}RI+ Cells Through Interaction with the VH3 Region of IgE1

Vincenzo Patella, Giovanni Florio, Angelica Petraroli and Gianni Marone2

University of Naples Federico II, Division of Clinical Immunology and Allergy, Naples, Italy

HIV-1 glycoprotein (gp) 120 from different clades is a potent stimulus for IL-4 and IL-13 release from basophils purified from healthy individuals seronegative for Abs to HIV-1 and HIV-2. IL-4 mRNA, constitutively present in basophils, was increased after stimulation by gp120 and was inhibited cyclosporin A and tacrolimus. IL-4 and IL-13 secretion from basophils activated by gp120 was not correlated. There was a correlation between the maximum gp120- and anti-IgE-induced IL-4 release from basophils. The average t1/2 gp120-induced IL-4 release was lower than for IL-13 release. Basophils from which IgE had been dissociated by brief exposure to lactic acid no longer released IL-4 in response to gp120 or to anti-IgE. The response to a mAb cross-linking the {alpha}-chain of high-affinity receptor for IgE (Fc{epsilon}RI) was unaffected by this treatment. Three human VH3+ monoclonal IgM inhibited gp120-induced secretion of IL-4 from basophils. In contrast, VH6+ monoclonal IgM did not inhibit the release of IL-4 induced by gp120. Synthetic peptides distant from the NH2 and COOH termini of gp120MN inhibited the activating property of gp120MN. These results indicate that gp120, which acts as a viral superantigen, interacts with the VH3 region of IgE to induce the release of IL-4 and IL-13 from human Fc{epsilon}RI+ cells.




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