Volume 14 Supplement 1

Proceedings of the 8th Global Arthritis Research Network (GARN) Meeting and 1st Bio-Rheumatology International Congress (BRIC)

Open Access

Pilocarpine suppresses hyperalgesia induced by intermittent cold stress (ICS) as an experimental fibromyalgia model in mice

  • Jun Nagai1,
  • Michiko Nishiyori1 and
  • Hiroshi Ueda1
Arthritis Research & Therapy201214(Suppl 1):P51

DOI: 10.1186/ar3652

Published: 29 February 2012

Fibromyalgia (FM) is a highly populated chronic pain disease, which has unique characteristics including generalized or widespread allodynia and female prevalence of gender difference. Many FM patients are common with Sjögren's syndrome. Pilocarpine, a non-selective muscarinic receptor agonist, is used clinically as a drug that promptes the secretion of salvia for dry eyes and mouth. Otherwise, pilocarpine has been shown to possess antinociceptive effect, which maybe caused by vagal afferents activation. The experimental FM mice exposed to intermittent cold stress (ICS) showed sustained abnormal pain, such as mechanical allodynia and hyperalgesia to nociceptive thermal stimuli for up to 19 days, but those given constant cold stress (CCS) did not. The abnormal pain was bilateral (generalized), female-predominant and specific for A-delta and A-beta, but not C-fiber-stimuli. In ICS mice, intraperitoneal or oral administration of pilocarpine showed potent anti-hyperalgesic effects in doses without excess salivation at post-stress day5 (P5). The anti-hyperagesic effects last for more than 1 h, but disappear at 24 h. Daily administration of pilocarpine showed equivalent anti-hyperalgesic effects without tolerance. These findings suggest that pilocarpine possesses a beneficial effect for the pain treatment of FM patients with dry eyes and mouth symptoms.



The research described in this article was supported in part by MEXT KAKENHI (17109015 to Hiroshi Ueda) and Health Labor Sciences Research Grants from the Ministry of Health, Labor and Welfare of Japan (to Hiroshi Ueda): "Research on Allergic disease and Immunology" also supported this work.

Authors’ Affiliations

Division of Molecular Pharmacology and Neurosciences, Nagasaki University Graduate School of Biomedical Sciences


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© Nagai et al.; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.