title: [Relationship between the expression of autoantibodies against platelet membrane glycoprotein and therapeutic effect in primary immune thrombocytopenia].
abstract: OBJECTIVE
  To study the expression of specific anti- platelet glycoprotein autoantibodies GP II b/III a, GP I b/IX and GP I a/II a in primary immune thrombocytopenia (ITP), and to evaluate the relationship between the therapeutic effect and the expression of specific anti- platelet glycoprotein antibodies GPIIb/IIIa, GPIb/IX and GPIa/IIa.
  
  
  METHODS
  Anti-GPIIb/IIIa, GPIb/ IX and GP I a/II a antibodies were assayed by ELISA for patients with ITP. Total 442 patients in our hospital, who were retrospectively investigated from December 2010 to November 2012, were divided into newly diagnosed ITP, persistent and chronic ITP. The expression of specific anti- platelet glycoprotein antibody in each group was measured separately. The newly diagnosed ITP patients were treated with intravenous IgG (IVIG) and corticosteroids. The relationship between the expression of specific anti- platelet glycoprotein antibodies GPIIb/IIIa, GPIb/IX and GPIa/IIa and the complete response (CR) was studied.
  
  
  RESULTS
  Positive rates of anti- platelet glycoprotein antibodies were 59.09%, 26.97% and 37.35% respectively in newly diagnosed ITP, persistent and chronic ITP, the difference was statistical significant (P<0.05). In newly diagnosed ITP, positive rate of antibody against GPIIb/IIIa was 38.64%, double positive rate of antibodies against both GP II b/III a and GP I a/II a was 15.91%, there was statistical significance (P<0.05) compared with that of persistent and chronic ITP. The complete response (CR) rate in newly diagnosed ITP patients with positive antibody against GP II b/III a was 80.39% after treatment with IVIG and corticosteroids. There was statistical significance compared with that in patients having no antibodies (P<0.05).
  
  
  CONCLUSIONS
  The expression of antibodies against GP II b/III a and double positive for both GP II b/III a and GP I a/II a autoantibodies increased in newly diagnosed ITP patients. Patients with anti-GP II b/III a autoantibody had good response to medication with IVIG and corticosteroids.
authors.affiliation: Institute of Hematology & Blood Diseases Hospital, CAMS & PUMC, Tianjin 300020, China.
authors.forename: Xiao-fan
authors.initials: XF
authors.lastname: Liu
authors.forename: Feng
authors.initials: F
authors.lastname: Xue
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Xue-li
authors.initials: XL
authors.lastname: Zhou
authors.forename: Yong-ze
authors.initials: YZ
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Yun-fei
authors.initials: YF
authors.lastname: Chen
authors.forename: Yue-ting
authors.initials: YT
authors.lastname: Huang
authors.forename: Ren-chi
authors.initials: RC
authors.lastname: Yang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001323:Autoantibodies / Q000378:metabolism*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000276:immunology; D019038:Platelet Glycoprotein GPIb-IX Complex / Q000276:immunology; D010980:Platelet Membrane Glycoproteins / Q000276:immunology; D012189:Retrospective Studies; D013921:Thrombocytopenia / Q000188:drug therapy* / Q000276:immunology / Q000378:metabolism*; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D001323:Autoantibodies; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; D019038:Platelet Glycoprotein GPIb-IX Complex; D010980:Platelet Membrane Glycoproteins