title: Immune functions in methylmalonicaciduria.
abstract: A variety of phagocytic cell and lymphocyte assays were employed to evaluate the immune status of four patients with methylmalonicaciduria . One patient had a depressed absolute granulocyte count and two patients had depressed neutrophil and monocyte chemotactic responses. All subjects had normal neutrophil phagocytic and bactericidal activities. One patient had a decreased T-cell number; blastogenic responses to phytohaemagglutinin and pokeweed mitogen were normal in all subjects. B lymphocyte measurements were variably abnormal; two children had decreased B-cell numbers; two had marginally decreased IgG levels; a third had an undetectable rubella titre; and two had elevated serum IgE concentrations. In vitro exposure of normal cells to methylmalonic acid concentrations up to 50 mg/100 ml did not affect chemotactic or lymphoproliferative responses. In conclusion, although B-cell function may be affected, no consistent abnormality of lymphocyte or phagocytic cell functions could be attributed to the metabolic disorder.
mesh_terms: D000138:Acidosis / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007111:Immunity, Cellular; D007070:Immunoglobulin A / Q000378:metabolism; D007075:Immunoglobulin M / Q000378:metabolism; D007153:Immunologic Deficiency Syndromes / Q000276:immunology*; D008607:Intellectual Disability / Q000276:immunology; D007958:Leukocyte Count; D008297:Male; D008314:Malonates / Q000652:urine*; D008764:Methylmalonic Acid / Q000652:urine*; D010587:Phagocytosis
chemical_list: D007070:Immunoglobulin A; D007075:Immunoglobulin M; D008314:Malonates; D008764:Methylmalonic Acid