title: [Comparison of the status of STAT4 tyrosine phosphorylation in peripheral T-lymphocytes induced by IL-12 in rheumatoid arthritis and osteoarthritis].
abstract: OBJECTIVE
  To compare the levels of STAT4 tyrosine phosphorylation in peripheral T-lymphocytes induced by IL-12 in rheumatoid arthritis (RA) and osteoarthritis (OA).
  
  
  METHODS
  From May 2007 to August 2009, peripheral blood mononuclear cells (PBMCs) were isolated from RA patients [RA group, all the cases were female, the age was from 28 to 55 years with an average of (45.0 +/- 13.0) years] and OA patients [OA group, all the cases also were female; the age was from 55 to 75 years with an average of (67.0 +/- 9.6) years]. The purity of T-lymphocytes from PBMCs was accredited by flow cytometry. The IL-12 of 50 ng/ml added in T-lymphocytes, the levels of STAT4 tyrosine phosphorylation were detected by western blot after different time intervals (0, 10, 30, 60 min).
  
  
  RESULTS
  The purity of T-lymphocytes were above 91% through diremption and depuration for peripheral blood monouclear cells. The levels of STAT4 tyrosine phosphorylation in T-lymphocytes from RA induced by IL-12 were higher than that from OA in the different times (10, 30, 60 min); after 30 min, its levels from RA and OA achieved to crest value.
  
  
  CONCLUSIONS
  STAT4 in peripheral T-lymphocytes of rheumatoid arthritis was more easily to be activated than osteoarthritis.
authors: Arthritis Clinic and Research Center, People's Hospital of Peking University, Beijing 100035, China.
authors: Zhen-Jie
authors: ZJ
authors: Sun
authors: Yu-Jun
authors: YJ
authors: Zhang
authors: Tie-Zheng
authors: TZ
authors: Sun
authors: Ao
authors: A
authors: Xiong
authors: Rui-Bo
authors: RB
authors: Liu
authors: Hou-Shan
authors: HS
authors: Lü