title: IgG anti-IgE autoantibodies in visceral leishmaniasis.
abstract: Procedures for IgG depletion in visceral leishmaniasis (VL) and schistosomiasis sera using Sepharose-protein G beads also deplete IgE. In this study, the presence of IgG anti-IgE autoantibodies in sera from patients with VL (n = 10), and hepatic-intestinal schistosomiasis (n = 10) and from healthy individuals (n = 10) was investigated. A sandwich ELISA using goat IgG anti-human IgE to capture serum IgE and goat anti-human IgG peroxidase conjugate to demonstrate the binding of IgG to the IgE captured was performed. VL sera had higher titers (p < 0.05) of IgG anti-IgE autoantibodies (OD = 2.01 +/- 0.43) than sera from healthy individuals (OD = 1.35 +/- 0.16) or persons infected with Schistosoma mansoni (OD = 1.34 +/- 0.18). The immunoblotting carried out with eluates from Sepharose-protein G beads used to deplete IgG from these sera and goat anti-human IgE peroxidase conjugate, showed a similar pattern of bands, predominating the 75 kDa epsilon-heavy chain and also polypeptides resulting from physiological enzymatic digestion of IgE. A frequent additional band immediately above 75 kDa was observed only in VL sera.
authors: Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal da Bahia, Rua Barão de Geremoabo s/no., Campus Ondina, 40171-970 Salvador, BA, Brasil. ajatta@ig.com.br
authors: A M
authors: AM
authors: Atta
authors: M L B
authors: ML
authors: Sousa-Atta
authors: A
authors: A
authors: D'Oliveira
authors: R P
authors: RP
authors: Almeida
authors: M I
authors: MI
authors: Araújo
authors: E M
authors: EM
authors: Carvalho
mesh_terms: D000888:Antibodies, Anti-Idiotypic / Q000097:blood / Q000276:immunology*; D001323:Autoantibodies / Q000097:blood / Q000276:immunology*; D019204:GTP-Binding Proteins / Q000378:metabolism; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology*; D007074:Immunoglobulin G / Q000097:blood / Q000276:immunology*; D007898:Leishmaniasis, Visceral / Q000097:blood / Q000276:immunology*; D011485:Protein Binding; D012555:Schistosomiasis mansoni / Q000097:blood / Q000276:immunology; D012685:Sepharose / Q000378:metabolism
chemical_list: D000888:Antibodies, Anti-Idiotypic; D001323:Autoantibodies; D007074:Immunoglobulin G; D007073:Immunoglobulin E; D012685:Sepharose; D019204:GTP-Binding Proteins