title: Serum leptin levels in patients with idiopathic thrombocytopenic purpura.
abstract: OBJECTIVE
  The purpose of this study was to evaluate serum leptin levels in idiopathic thrombocytopenic purpura (ITP), in order to determine the influence of leptin on the pathogenesis of ITP.
  
  
  METHODS
  Forty-six untreated patients with chronic ITP were compared with 40 healthy people of similar age, sex and body mass index (BMI). Serum leptin levels (ng/mL) were measured by enzyme-linked immunosorbent assay (ELISA).
  
  
  RESULTS
  We found that the mean serum leptin levels in patients with ITP (22.11 +/- 15.84 ng/mL) were significantly (P < 0.001) higher than that in healthy control volunteers (5.44 +/- 4.84 ng/mL). Furthermore, serum leptin levels in patients with ITP were inversely related (r = -0.86, P < 0.001) to the platelet counts and positively related to the platelet-associated IgG (PAIgG) levels (r = 0.7, P < 0.001). The levels of PAIgG and platelet counts were significantly different between leptin-positive (level greater than mean +/- 2 SD control value) and leptin-negative patients.
  
  
  CONCLUSIONS
  These findings suggest that leptin might play an important role in the pathogenesis of ITP.
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 288 Nanjing Road, Tianjin 30020, China.
authors.forename: Mei
authors.initials: M
authors.lastname: Zhan
authors.forename: Hui
authors.initials: H
authors.lastname: Zhao
authors.forename: Renchi
authors.initials: R
authors.lastname: Yang
authors.forename: Zhong Chao
authors.initials: ZC
authors.lastname: Han
mesh_terms: D000328:Adult; D016824:Antigens, Human Platelet / Q000276:immunology; D001323:Autoantibodies / Q000097:blood*; D001327:Autoimmune Diseases / Q000097:blood* / Q000276:immunology; D001792:Blood Platelets / Q000276:immunology*; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood*; D020738:Leptin / Q000097:blood* / Q000502:physiology; D008297:Male; D008875:Middle Aged; D010976:Platelet Count; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000097:blood* / Q000276:immunology
chemical_list: D016824:Antigens, Human Platelet; D001323:Autoantibodies; D007074:Immunoglobulin G; D020738:Leptin