Anti-IL17F polyclonal antibody

Purpose: To investigate the associations of IL17A, IL17F, IL23A, and IL23R copy number variants (CNVs) with Vogt-Koyanagi-Harada (VKH) syndrome and Behcet's disease (BD) and the possible mechanisms involved. Design: Two-stage case-control and functional studies. Participants: A total of 1159 VKH patients, 1036 BD patients, and 2050 controls were enrolled. Methods: TaqMan real-time polymerase chain reaction assay was used for genotyping of copy number variant. Cell proliferation was measured by colorimetric assay. Main Outcome Measures: Association of CNVs in IL17A, IL17F, IL23A, and IL23R with BD and VKH syndrome and the functional roles of IL17F CNVs. Results: Increased frequencies of more than 2 copies of IL17F and IL23A were found in BD patients as compared with controls (IL17F: P = 4.17 x 10(-8); odds ratio [OR], 2.2; IL23A: P = 2.86 x 10(-11); OR, 2.8, respectively). A similar result was found for VKH syndrome (IL17F: P = 2.84 x 10(-13); OR, 2.7; IL23A: P = 4.46 x 10(-17); OR, 3.4, respectively). Interestingly, the association of IL17F and IL23A with BD was found only in male patients (IL17F: P = 1.06 x 10(-6); OR, 2.3; IL23A, P = 3.81 x 10(-8); OR, 2.8, respectively), but not in female patients. No association of CNVs in IL17A and IL23R was found for BD and VKH syndrome. IL17F protein levels were correlated positively with gene copy numbers (P = 3.43 x 10(-7)). Individuals with high IL17F copies showed enhanced peripheral blood mononuclear cells (PBMC) proliferation (P = 5.67 x 10(-3)). Conclusions: High gene copy numbers of IL17F and IL23A were associated with BD and VKH syndrome. Enhanced IL17F protein production and PBMC proliferation were associated with high IL17F copy numbers. (C) 2015 by the American Academy of Ophthalmology.

Introduction: Smoking increases the risk of developing rheumatoid arthritis (RA) and affects the severity of established RA. Smoking can impact on Th17 lymphocyte differentiation and function through activation of the aryl hydrocarbon receptor (AHR), a process with implications for the pathogenic mechanisms in RA that involve the cytokine, interleukin (IL)-17A. The objective of this study was to establish any effect of smoking on the inflammatory tissue lesions of rheumatoid arthritis via the AHR and IL-17A. Methods: Twenty synovial and eighteen subcutaneous nodule tissue samples from 31 patients with RA were studied. Patient smoking status at the time of tissue collection was established. Expression of AHR, CYP1A1, AHRR, IL6, IL17A, IL17F, IL22, IL23, IL23R, IFNG, TBX21, IDO1 and FOXP3 genes were assessed in tissues and cultured cells using real-time PCR. Two-colour immunofluorescence was used to co-localise AHR and CYP1A1 protein in synovial tissues. The response of monocytes and monocyte-derived dendritic cells (mo-DCs) to the AHR agonist, benzo(a) pyrene (BaP) was compared in vitro. Results: AHR gene expression was demonstrated in rheumatoid synovial tissues and nodules with significantly greater expression in synovia. Expression was not influenced by smoking in either tissue. Evidence of AHR activation, indicated by CYP1A1 and AHRR gene expression, was found only in synovia from patients who smoked. However, IL17A gene expression was lower in synovia from smokers. TBX21 and FOXP3 expression was not affected by smoking. Within the synovial tissues of smokers the principal cell type with evidence of AHR activation was a subset of synovial DCs. This observation was consistent with the sensitivity of human mo-DCs to BaP stimulation demonstrated in vitro. Exposure to BaP affected mo-DC function as demonstrated by decreased IL6 expression induced by PolyI:C, without affecting indoleamine 2,3 dioxygenase (IDO) 1 expression. Conclusion: Our findings show that one effect of smoking on inflamed rheumatoid synovial tissue involves activation of the AHR pathway. A subset of synovial DCs is important in the response to cigarette smoke. The potential for smoking to affect DC behaviour in joint tissues has relevance to both early and late phases of RA pathogenesis and warrants further investigation.