title: Differential expression of toll-like receptor 6 on granulocytes and monocytes implicates the role of microorganisms in Behcet's disease etiopathogenesis.
abstract: The objective of this study was to investigate the expressions of toll-like receptors on neutrophils and monocytes in Behcet's disease (BD). Forty-two patients with BD were included in the study. Baseline and stimulated cells with heat shock protein-60 (HSP-60), lipopolysaccharide (LPS) and crude extract of Streptococcus sanguis (SS) were analyzed for toll-like receptor-1, -2, -4 and -6 expressions using flow cytometer. Results were confirmed using semi-quantitative PCR technique. The mean frequency of TLR-6 expressing granulocytes in BD patients was significantly lower than in controls (4.2 +/- 0.6 vs. 9.2 +/- 0.6 and 8.0 +/- 1.4, BD vs. rheumatoid arthritis (RA) and healthy control (HC); P < 0.05). TLR-6 expressing granulocyte population was enhanced after stimulation with HSP-60 and SS (20 +/- 0.5 and 12.8 +/- 0.6, respectively). Decreased TLR-2 expression was noted in monocytes of BD patients after stimulation with HSP-60 and LPS (71.0 +/- 0.5 and 73.0 +/- 0.5; P < 0.02, for both antigens). Functional abnormalities of these receptors or different activation cascades by different microorganisms are associated with disease pathogenesis in Behcet's disease.
authors.affiliation: Department of Rheumatology, University of Marmara, Istanbul, Turkey. suleyavuz@gmail.com
authors.forename: Sule
authors.initials: S
authors.lastname: Yavuz
authors.forename: Yesim
authors.initials: Y
authors.lastname: Elbir
authors.forename: Aysin
authors.initials: A
authors.lastname: Tulunay
authors.forename: Emel
authors.initials: E
authors.lastname: Eksioglu-Demiralp
authors.forename: Haner
authors.initials: H
authors.lastname: Direskeneli
mesh_terms: D000293:Adolescent; D000328:Adult; D001172:Arthritis, Rheumatoid / Q000378:metabolism; D001528:Behcet Syndrome / Q000276:immunology / Q000378:metabolism* / Q000382:microbiology; D016022:Case-Control Studies; D005260:Female; D006098:Granulocytes / Q000378:metabolism*; D006801:Humans; D007113:Immunity, Innate; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000378:metabolism*; D051195:Toll-Like Receptor 2 / Q000378:metabolism; D051216:Toll-Like Receptor 6 / Q000378:metabolism*
chemical_list: C495342:TLR2 protein, human; C495368:TLR6 protein, human; D051195:Toll-Like Receptor 2; D051216:Toll-Like Receptor 6