title: Idiopathic autoimmune thrombocytopenia: evidence for redistribution of platelet antibodies into the circulation after immunoadsorption treatment.
abstract: Platelet antibodies are detectable in only about 50% of patients with chronic autoimmune thrombocytopenia (AITP). We determined platelet antibodies against GPIa/IIa, GPIb/IX, GPIIb/IIIa, and GPV and reticulated platelets in three female patients with AITP, before and after immunoadsorption treatment. None of the three patients' sera contained platelet antibodies prior to treatment. Thereafter, anti-GPIIb/IIIa, anti-GPIb/IX (n = 3), and anti-GPV (n = 1) were detectable in the patients' sera. These antibody specificities were also found in the eluates from the immunoadsorption columns. Only one patient had elevated levels of reticulated platelets. Immunoadsorption treatment did not induce a sustained increase of platelet counts in any patient. Immunoadsorption treatment in AITP can induce redistribution of antibodies into the circulation.
authors.affiliation: Clinic for Blood Group Serology and Transfusion Medicine, University Hospital of Vienna, Währingergürtel 18-20, A-1090 Vienna, Austria.
authors.forename: G C
authors.initials: GC
authors.lastname: Leitner
authors.forename: G
authors.initials: G
authors.lastname: Stiegler
authors.forename: M
authors.initials: M
authors.lastname: Horvath
authors.forename: P
authors.initials: P
authors.lastname: Hoecker
authors.forename: P
authors.initials: P
authors.lastname: Sagaster
authors.forename: S
authors.initials: S
authors.lastname: Panzer
mesh_terms: D000293:Adolescent; D000328:Adult; D000918:Antibody Specificity; D001323:Autoantibodies / Q000097:blood*; D001792:Blood Platelets / Q000276:immunology*; D005260:Female; D006801:Humans; D007163:Immunosorbent Techniques; D010976:Platelet Count; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000276:immunology; D019038:Platelet Glycoprotein GPIb-IX Complex / Q000276:immunology; D010980:Platelet Membrane Glycoproteins; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000276:immunology* / Q000628:therapy*
chemical_list: D001323:Autoantibodies; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; D019038:Platelet Glycoprotein GPIb-IX Complex; D010980:Platelet Membrane Glycoproteins; C032193:glycoprotein receptor GPIb-IX