Abstract
Background
IgE/anti-IgE immune complexes (IgE-IC) induce the release of multiple mediators from monocytes/macrophages and the monocytic cell line U937 following the ligation of the low-affinity Fcε receptors (FcεRII/CD23). These effects are mediated through an accumulation of cAMP and the generation of L-arginine-dependent nitric oxide (NO). Since high IgE levels predict more rapid progression to acquired immunodeficiency syndrome, we attempted to define the effects of IgE-IC on human immunodeficiency virus (HIV) production in monocytes.
Materials and Methods
Two variants of HIV-1 chronically infected monocytic U1 cells were stimulated with IgE-IC and virus replication was quantified. NO and cAMP involvement was tested through the use of agonistic and antagonistic chemicals of these two pathways.
Results
IgE-IC induced p24 production by U1 cells with low-level constitutive expression of HIV-1 mRNAs and extracellular HIV capsid protein p24 levels (U1low), upon their pretreatment with interleukin 4 (IL-4) or IL-13. This effect was due to the crosslinking of CD23, as it was reversed by blocking the IgE binding site on CD23. The IgE-IC effect could also be mimicked by crosslinking of CD23 by a specific monoclonal antibody. p24 induction by IgE-IC was then shown to be due to CD23-mediated stimulation of cAMP, NO, and tumor necrosis factor α (TNFα) generation. In another variant of U1 cells with >1 log higher constitutive production of p24 levels (U1high), IgE-IC addition dramatically decreased all cell functions tested and accelerated cell death. This phenomenon was reversed by blocking the nitric oxide generation.
Conclusions
These data point out a regulatory role of IgE-IC on HIV-1 production in monocytic cells, through CD23-mediated stimulation of cAMP and NO pathways. IgE-IC can also stimulate increased cell death in high HTV producing cells through the NO pathway.
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Acknowledgments
We thank N. Paul-Eugène, J. P. Kolb, J. Wietzerbin, and H. Valentin for their suggestions; F. Issaly for technical assistance; J. Banchereau for rIL-4 and rIL-13 gift; and M. Benhamou and M. Arock for reviewing our work. The contents of this publication do not necessarily reflect the views nor policies of the Department of Health and Human Services, nor does the mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
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Contributed by S. Moncada on August 30, 1995.
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Ouaaz, F., Ruscetti, F.W., Dugas, B. et al. Role of IgE Immune Complexes in the Regulation of HIV-1 Replication and Increased Cell Death of Infected U1 Monocytes: Involvement of CD23/FcεRII-Mediated Nitric Oxide and Cyclic AMP Pathways. Mol Med 2, 38–49 (1996). https://doi.org/10.1007/BF03402201
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DOI: https://doi.org/10.1007/BF03402201