title: The sera from individuals suffering from cutaneous leishmaniasis due to Leishmania brazilensis present antibodies against parasitic conserved proteins, but not their human counterparts.
abstract: Sera from individuals suffering from leishmaniasis have been shown to strongly react against conserved proteins from the parasite, such as ribosomal, histones and heat-shock proteins. Some of these proteins have also been described as immunogenic in several auto-immune syndromes, and the detection of antibodies against them is considered to be indicative of disorder of the immune system. In this paper, we investigate whether there is any relationship between the recognition of some conserved proteins from leishmania braziliensis by individuals suffering from cutaneous (CL) and mucocutaneous (MCL) leishmaniasis, and the recognition of the human homologues of these antigens found in sufferers from autoimmune diseases. Our findings reveal that the immune response generated during CL and MCL is elicited specifically by the parasitic histone H1 and Hsp70, since the CL and MCL sera do not react against their human counterparts. In addition, evidence is presented showing the specific recognition of human proteins by the autoimmune sera, showing only a weak cross-reaction with the most divergent regions of the parasitic proteins.
authors.affiliation: Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Avda. Astrofisico Fco. Sanchez, S/N 38203, La Laguna, Canary Islands, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Carmelo
authors.forename: A I
authors.initials: AI
authors.lastname: Zurita
authors.forename: E
authors.initials: E
authors.lastname: Martinez
authors.forename: B
authors.initials: B
authors.lastname: Valladares
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000096:biosynthesis / Q000097:blood*; D000918:Antibody Specificity; D000953:Antigens, Protozoan / Q000276:immunology; D001323:Autoantibodies / Q000096:biosynthesis / Q000097:blood; D001327:Autoimmune Diseases / Q000175:diagnosis / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D018840:HSP70 Heat-Shock Proteins / Q000276:immunology; D006657:Histones / Q000276:immunology; D006801:Humans; D007892:Leishmania braziliensis / Q000276:immunology*; D016773:Leishmaniasis, Cutaneous / Q000276:immunology*; D015800:Protozoan Proteins / Q000276:immunology*; D012269:Ribosomal Proteins / Q000276:immunology
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D001323:Autoantibodies; D018840:HSP70 Heat-Shock Proteins; D006657:Histones; D015800:Protozoan Proteins; D012269:Ribosomal Proteins