title: [Changes of death receptor regulator expression in the articular cartilage of patients with Kashin-Beck disease].
abstract: OBJECTIVE
  To investigate the changes in the expressions of Fas-associated death domain protein (FADD) and cellular-FLICE inhibitory protein (c-FLIP) in the articular cartilage of patients with Kashin-Beck disease (KBD) and the role of these proteins in the pathogenesis of KBD.
  
  
  METHODS
  The cartilage samples were collected from patients with established diagnosis of KBD and osteoarthritis and from healthy control subjects undergoing amputation due to traffic accidents. The expressions of Fas-associated death domain protein (FADD) and cellular-FLICE inhibitory protein (c-FLIP) in the cartilage were detected by immunohistochemistry, and the positive chondrocytes were counted in different layers of the articular cartilage under microscope.
  
  
  RESULTS
  The positivity rates of FADD in the middle layer of articular cartilage from patients with KBD [(28.68∓2.19)%] and osteoarthritis [(35.40∓2.34)%] were significantly higher than that in normal cartilage [(10.51∓5.02)%, F=16.245, P=0.000], but the rates in the upper and deeper layers were comparable among the 3 groups (P=0.206-0.761). In KBD cartilage, FADD expression was the highest in the middle layer [(28.68∓5.38)%] followed by the deeper layer [(17.94∓8.38)%]. Compared with the healthy controls, KBD and osteoarthritis patients showed significantly higher FLIP expression in the upper layer of the cartilage (F=5.929, P=0.018) but similar expressions in middle and deeper layers.
  
  
  CONCLUSIONS
  KBD patients have significant increased FADD expression in the middle layer but decreased FLIP expression in the upper layer of the cartilage, suggesting that the death receptor pathway and its regulators play important roles in the pathogenesis of KBD.
authors: Faculty of Public Health, College of Medicine, Key Laboratory of Environment and Gene Related Diseases of Ministry Education, Key Laboratory of Trace Elements and Endemic Diseases of Ministry of Health, First Affiliated Hospital, Xi an Jiaotong University College of Medicine, Xi an 710061, China. wushixun313@stu.xjtu.edu.cn
authors: Shi-xun
authors: SX
authors: Wu
authors: Xiong
authors: X
authors: Guo
authors: Jiang-tao
authors: JT
authors: Liu
authors: Zeng-tie
authors: ZT
authors: Zhang
authors: Bannel S
authors: BS
authors: Dennis
authors: Yin-gang
authors: YG
authors: Zhang
mesh_terms: D053446:CASP8 and FADD-Like Apoptosis Regulating Protein / Q000378:metabolism*; D002358:Cartilage, Articular / Q000378:metabolism* / Q000473:pathology; D016022:Case-Control Studies; D053200:Fas-Associated Death Domain Protein / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D057767:Kashin-Beck Disease / Q000378:metabolism* / Q000473:pathology*
chemical_list: D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; C506386:CFLAR protein, human; C505533:FADD protein, human; D053200:Fas-Associated Death Domain Protein