title: [Effect of proinflammatory cytokines on human leucocyte antigen expression of epithelial cells of nasal polyps].
abstract: OBJECTIVE
  To explore the effect of proinflammatory cytokines on the expression of human leucocyte antigen(HLA-DR) in epithelial cell of nasal polyps.
  
  
  METHODS
  The samples were from 23 patients with nasal polyps and 11 cases of normal inferior turbinates. The samples were fixed, paraffin-embeded and sectioned for observing distribution of HLA-DR positive cells. Nasal epithelial cells were obtained after enzymatic digestion and cell culture was performed for observing influences of interleukin (IL)-1 beta and tumor necrosis factor (TNF-alpha) to expression of HLA-DR of epithelial cells and the effect of dexamethasone(10(-5) mol/L).
  
  
  RESULTS
  The HLA-DR expression in epithelium was significantly stronger in nasal polyps than that in inferior turbinates. The expression of HLA-DR in cultured cells under stimulation of proinflammatory cytokines was increased compared with controls, but the expression was more intense in nasal polyps than that in inferior turbinates. Increased HLA-DR expression under stimulation of cytokines was reduced significantly by dexamethasone.
  
  
  CONCLUSIONS
  The epithelium is in a key position to participate in inflammatory and immunologic events in the airways. Epithelial cells potentially contribute to airway inflammation by antigen presentation and the production of proinflammatory cytokines.
mesh_terms: D000328:Adult; D005260:Female; D006684:HLA-DR Antigens / Q000096:biosynthesis*; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D009297:Nasal Mucosa / Q000187:drug effects* / Q000378:metabolism; D009298:Nasal Polyps / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
chemical_list: D006684:HLA-DR Antigens; D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha