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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Vouldoukis, I. Mossalayi, M. D. Riveros-moreno, V. Ouaaz, F. Bécherel, P. Moncada, S. Debré, P. Dugas, B. |
| Description | Author Affiliation: Vouldoukis I ( Centre National de la Recherche Scientifique, Pitié-Salpêtrière Hospital, Paris, France.); |
| Abstract | Serum IgE concentrations and the expression of the low-affinity receptor for IgE (Fc epsilon RII/CD23) are increased in cutaneous leishmaniasis or after immune challenge with Leishmania antigens. In vitro, the ligation of CD23 by IgE-anti-IgE immune complexes (IgE-IC) or by anti-CD23 monoclonal antibody (mAb) induces nitric oxide (NO) synthase and the generation of various cytokines by human monocytes/macrophages. The present study shows that IgE-IC, via CD23 binding, induce intracellular killing of Leishmania major in human monocyte-derived macrophages through the induction of the L-arginine:NO pathway. This was demonstrated by increased generation of nitrite (NO2-), the stable oxidation product of NO, and by the ability of NG-monomethyl-L-arginine to block both NO generation and parasite killing. A similar NO-dependent effect was observed with interferon gamma-treated cells. Tumor necrosis factor alpha is involved in this process, since both the induction of NO synthase and the killing of parasites caused by anti-CD23 mAb were inhibited by an anti-tumor necrosis factor alpha mAb. Treatment of noninfected CD23+ macrophages with IgE-IC provided protection against subsequent in vitro infection of these cells by Leishmania major promastigotes. Thus, IgE-IC promote killing of L. major by inducing NO synthase in human macrophages. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 17 |
| Volume Number | 92 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1995-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amino Acid Oxidoreductases Biosynthesis Cytokines Pharmacology Leishmania Major Immunology Macrophages Nitric Oxide Receptors, IgE Physiology Antagonists & Inhibitors Metabolism Animals Antibodies, Monoclonal Antigens, CD Arginine Analogs & Derivatives Cells, Cultured DNA Primers Gene Expression Interferon-gamma Interleukin-4 Lipopolysaccharides Drug Effects Molecular Sequence Data Nitric Oxide Synthase Phagocytosis Polymerase Chain Reaction RNA, Messenger Recombinant Proteins Superoxides Tumor Necrosis Factor-alpha Omega-N-Methylarginine Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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