title: Serum leptin levels do not correlate with disease activity in rheumatoid arthritis.
abstract: OBJECTIVE
  Leptin, is a fat tissue hormone which effects energy expenditure, food intake , hematopoiesis, osteogenesis, angiogenesis, reproductive and immune systems. We aimed to determine serum leptin levels and investigate the association between disease activity and other parameters in RA patients.
  
  
  METHODS
  Patients with RA (n=106) as the study group, healthy controls (n=52) and osteoarthritis (OA) patients (n=37) as a control group were enrolled to the study. RA patients were categorized in four different groups according to DAS28 scores: remission ,low (LDA), moderate (MDA) or high (HDA) disease activity .
  
  
  RESULTS
  No differences were present between the body mass indices of the three groups. Mean leptin levels in RA patients, OA group and healthy individuals were 25,60 ± 13,41, 23,03 ± 11,51 and 23,81 ± 12,85 ng/ml, respectively and no significant difference was present between the groups. Nine of (8,5%) RA patients were in remission, 16 (15,1%) were in LDA, 40 (37,7%) in MDA and 41 (38,7%) were in HDA. Leptin levels did not correlate with DAS28 scores of RA patients (r=-0,12, p=0,11). Mean leptin levels in RA patients with remission was 32,65 ± 7, 28 in LDA 23,94 ± 10,94 in MDA 26,73 ± 14,92 and in HDA 23,59 ± 13,50 ng/ml (p=NS). No associations were observed between leptin levels and CRP, ESR, RF positivity and disease duration.
  
  
  CONCLUSIONS
  Our study revealed no correlation of disease activity and serum leptin levels. Therefore leptin does not seem to be an appropriate biomarker to monitorize inflammation in RA.
authors.affiliation: Marmara University, School of Medicine, Department of Rheumatology.
authors.forename: Sibel Yilmaz
authors.initials: SY
authors.lastname: Oner
authors.affiliation: Fatih Sultan Mehmet Training and Research Hospital, Department of Rheumatology.
authors.forename: Omur
authors.initials: O
authors.lastname: Volkan
authors.affiliation: Istanbul Bilim University, School of Medicine, Department of Family Medicine.
authors.forename: Can
authors.initials: C
authors.lastname: Oner
authors.affiliation: Fatih Sultan Mehmet Training and Research Hospital, Department of Rheumatology.
authors.forename: Alperen
authors.initials: A
authors.lastname: Mengi
authors.affiliation: Marmara University, School of Medicine, Department of Rheumatology.
authors.forename: Haner
authors.initials: H
authors.lastname: Direskeneli
authors.affiliation: Medical Park Goztepe Hospital, Department of Rheumatology.
authors.forename: Demet Ataman
authors.initials: DA
authors.lastname: Tasan
mesh_terms: D001172:Arthritis, Rheumatoid / Q000097:blood* / Q000175:diagnosis*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D020738:Leptin / Q000097:blood*; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000097:blood
chemical_list: D020738:Leptin