Frequency and Associated Factors of Generalized Bone Loss in Premenopausal Early Rheumatoid Arthritis / 대한류마티스학회지

OBJECTIVE: To investigate frequency and associated factors of generalized bone loss in patients with premeonpausal early rheumatoid arthritis (RA)who had not been treated with corticosteroid. METHODS: We measured bone mineral density (BMD)of lumbar spine and hip by dual energy X-ray absorptiometry (DEXA,Hologic QDR 4500)and investigated clinical;age,disease duration,numbers of tender and swollen joint,and laboratory;erythrocyte sedimentation rate (ESR),C-reactive protein (CRP)and rheumatoid factor (RF),variables in patients with premenopausal early RA who had not been treated with corticosteroid,consecutively.Generalized bone loss was defined as T score less than -1,and clinical and laboratory variables were analyzed for generalized bone loss. RESULTS: In 41 patients with premenopausal early RA (age;38 +/-8 years, duration of disease 8 +/-6 months),the frequency of generalized bone loss in lumbar spine and hip were 35%and 46%.In multivariate logistic regression analysis,elevated CRP level was significantly associated with generalized bone loss in lumbar spine and femur neck. CONCLUSIONS: In patients with premenopausal early RA,elevated CRP level was associated with generalized bone loss of lumbar spine and femur neck.

The Effects of Interleukin-17 on Production of Vascular Endothelial Growth Factor in Cultured Rheumatoid Arthritis Synoviocytes / 대한류마티스학회지

OBJECTIVE: To investigate the the effects of interleukin-17 (IL-17)on the production of vascular endothelial growth factor (VEGF)from cultured rheumatoid arthritis synoviocytes. METHODS: Fibroblast-like synovial cells(FLS)were prepared from the synovial tissues of rheumatoid arthritis patients and cultured in the presence of IL-17, IL-17 with or without transforming growth factor-beta(TGF-beta),tumor necrosis factor-alpha(TNF-alpha)and interleukin-1 beta(IL-1 beta).VEGF levels were determined in the culture supernatants by sandwitch ELISA. RESULTS: Stimulation of FLS by serial concentration of IL-17,TGF-beta,TNF-alpha,IL-1 beta increased the production of VEGF by 2.1-2.7,2.2-3.0,2.0-2.9,2.3-3.1 fold over the constitutive levels of unstimulated FLS.Stimulation of FLS by IL- 17 with TGF-beta or TNF-alpha or IL-1 beta also increased the production of VEGF accord-ing to culture periods by 1.6-1.8,1.1-1.9,1.5-1.7 fold over the levels stimulated with TGF-beta or TNF-alpha or IL-1 beta,respectively.This results indicated that IL-17 increased the effect of TGF-beta,TNF-alpha,IL-1 beta on FLS,leading synergistic enhancement of VEGF production. CONCLUSION: IL-17 may be involved in the neovascularization in rheumatoid synovitis by enhancing the production of VEGF.