Stimulation of nicotinic acetylcholine receptors attenuates collagen-induced arthritis in mice

Arthritis and Rheumatism
Marjolein A van MaanenPaul P Tak

Abstract

The parasympathetic nervous system, through the vagus nerve, can down-regulate inflammation in vivo by decreasing the release of cytokines, including tumor necrosis factor alpha (TNFalpha), by activated macrophages. The vagus nerve may exert antiinflammatory actions via a specific effect of its principal neurotransmitter, acetylcholine, on the alpha7 subunit of nicotinic acetylcholine receptors (alpha7nAChR) on macrophages. The present study was undertaken to obtain insight into the role of the cholinergic antiinflammatory pathway in arthritis. To inhibit the cholinergic antiinflammatory pathway, mice were subjected to unilateral cervical vagotomy or sham surgery, after which arthritis was induced with type II collagen. In a separate study, nicotine was added to the drinking water of mice with collagen-induced arthritis (CIA). In addition, we investigated the effects of intraperitoneally (IP)-injected nicotine and the specific alpha7nAChR agonist AR-R17779. Clinical arthritis was exacerbated by vagotomy and ameliorated by oral nicotine administration. Moreover, oral nicotine inhibited bone degradation and reduced TNFalpha expression in synovial tissue. Both IP-injected nicotine and AR-R17779 ameliorated clinical arthritis and r...Continue Reading

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Citations

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