The alpha7 nicotinic acetylcholine receptor on fibroblast-like synoviocytes and in synovial tissue from rheumatoid arthritis patients: A possible role for a key neurotransmitter in synovial inflammation.

Maanen, M.A., Stoof, S.P., van der Zanden, E.P., de Jonge, W.J., Janssen, R.A., Fischer, D.F., Vandeghinste, N., Brys, R., Vervoordeldonk, M.J., Tak, P.P.
Journal   Arthritis Rheum.
Species  
Analytes Measured   IL-8
Matrix Tested   Tissue culture supernatants from fibroblast-like synoviocytes collected and cultured from synovial fluid
Year   2009
Volume   60
Page Numbers   1272-81
Application   Cytokines and Chemokines
Abstract

OBJECTIVE: Recent studies have suggested an important role for neurotransmitters as modulators of inflammation. Therefore, we undertook this study to investigate the expression of the alpha7 subunit of the nicotinic acetylcholine receptor (alpha7nAChR) and its function in rheumatoid arthritis (RA).

METHODS: The potential role of the alpha7nAChR in modulating proinflammatory cytokine expression in fibroblast-like synoviocytes (FLS) was identified by screening an adenoviral short hairpin RNA (Ad.shRNA) library. An alpha7-specific antibody was used for immunohistochemistry, and fluorescein isothiocyanate-labeled alpha-bungarotoxin, which binds specifically to the alpha7nAChR, was used for immunofluorescence. Gene expression in FLS was determined by quantitative polymerase chain reaction with primers specific for the alpha7nAChR. In addition, we analyzed messenger RNA (mRNA) expression of dupalpha7, a variant alpha7 transcript. Next, we studied the functional role of the alpha7nAChR in RA FLS by examining the effects of alpha7-specific agonists on the production of interleukin-6 (IL-6) and IL-8 by activated FLS.

RESULTS: A screen using an Ad.shRNA library against 807 transcripts revealed that a specific alpha7nAChR shRNA potently modulated IL-8 and matrix metalloproteinase expression in FLS. The alpha7nAChR was expressed in the inflamed synovium from RA patients, predominantly in the intimal lining layer. We found alpha7nAChR expression at both the mRNA and protein level in cultured RA FLS. FLS also constitutively expressed dupalpha7 mRNA. Specific alpha7nAChR agonists reduced tumor necrosis factor alpha-induced IL-6 and IL-8 production by FLS.

CONCLUSION: The alpha7nAChR and its dupalpha7 variant are expressed in RA synovium, where they may play a critical role in regulating inflammation. Targeting the alpha7nAChR could provide a novel antiinflammatory approach to the treatment of RA.

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IL-8 | Human
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Human TH1/TH2 10-Plex Tissue Culture Kit
IFN-γ, IL-1β, IL-2, IL-4, IL-5, IL-8, IL-10, IL-12p70, IL-13, TNF-α | Human
Multiplex
Canine ProInflammatory Panel 3 Ultra-Sensitive Kit
IL-2, IL-6, IL-8, TNF-α | Canine
Multiplex
MA6000 Human IL-8 384 Tissue Culture Kit
IL-8 | Human
Singleplex
MS6000 Human ProInflammatory-4 II 384 Tissue Culture Kit
IL-6, IL-8 | Human
Multiplex
U-PLEX Biomarker Group 1 NHP Assays
CTACK, ENA-78, Eotaxin, Eotaxin-2, Eotaxin-3, FLT3L, Fractalkine, G-CSF, GM-CSF, GRO-α, I-309, IFN-α2a, IFN-γ, IL-1α, IL-1β, IL-1RA, IL-2, IL-2Rα, IL-4, IL-5, IL-6, IL-7, IL-8, IL-9, IL-10, IL-12/IL-23p40, IL-12p70, IL-13, IL-15, IL-16, IL-17A, IL-17A/F, IL-17B, IL-17C, IL-17D, IL-17F, IL-18, IL-22, IL-23, IP-10, I-TAC, MCP-1, MCP-2, MCP-3, MCP-4, M-CSF, MDC, MIF, MIP-1α, MIP-1β, MIP-3α, MIP-3β, MIP-5, SDF-1α, TARC, TGF-β1, TGF-β2, TGF-β3, TNF-α, TNF-β, TPO, TRAIL, VEGF-A, YKL-40 | Non-human primate
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