title: High titres of anti-T antibodies and other haemagglutinins in human malaria.
abstract: The prevalence of antibodies against (i) human red blood cells (RBC) of A and B groups, (ii) trypsinized O Rh+ RBC and (iii) neuraminidase treated O Rh+ RBC were investigated both in sera of Africans from a malaria endemic area of Upper Volta and in sera of Europeans with acute malaria from a Paris hospital. An increased frequency of high titres of haemagglutinins was observed against A and B as well as O Rh+ trypsinized human RBC, thus confirming previously published results. In addition, agglutination of neuraminidase treated RBC showed that the titres were increased in about 40% of Africans studied and in about 80% of patients with acute malaria. Using agglutination with a specific anti-T lectin and inhibition with two ligands, it was found that sera of malarious patients contain high titres of antibodies directed against the T antigen of neuraminidase treated RBC. The mechanisms of appearance of high titres of autohaemagglutinins in malaria and their possible interference in the anaemia associated with this disease are discussed.
mesh_terms: D000017:ABO Blood-Group System / Q000276:immunology; D000208:Acute Disease; D000918:Antibody Specificity; D000941:Antigens / Q000276:immunology*; D015295:Antigens, Tumor-Associated, Carbohydrate; D001323:Autoantibodies / Q000032:analysis*; D006384:Hemagglutination / Q000187:drug effects; D006388:Hemagglutinins / Q000032:analysis*; D006801:Humans; D008288:Malaria / Q000276:immunology*; D009439:Neuraminidase / Q000494:pharmacology; D014357:Trypsin / Q000494:pharmacology
chemical_list: D000017:ABO Blood-Group System; D000941:Antigens; D015295:Antigens, Tumor-Associated, Carbohydrate; D001323:Autoantibodies; D006388:Hemagglutinins; C016467:Thomsen-Friedenreich antigen; D009439:Neuraminidase; D014357:Trypsin