• Pain Med · Feb 2018

    Evidence of Altered Trigeminal Nociception in an Animal Model of Fibromyalgia.

    • Masoud Nazeri, Mohammad-Reza Zarei, Amin-Reza Pourzare, Hamid-Reza Ghahreh-Chahi, Fatemeh Abareghi, and Mohammad Shabani.
    • Oral and Dental Diseases Research Center.
    • Pain Med. 2018 Feb 1; 19 (2): 328-335.

    ObjectiveFibromyalgia (FM) is a debilitating chronic condition that significantly affects quality of life. A strong association has been demonstrated between FM and chronic pain in the trigeminal region in clinical studies. This study was performed to evaluate the response to acute and chronic noxious stimuli applied to the facial region.MethodsAdult male Wistar rats (250-270 g, N = 10 for each group) were used in the current study. A subchronic swim stress model was used as the animal model of FM. Anxiety-like behaviors and response to acute and chronic noxious stimuli were assayed using the elevated plus maze, eye wiping test, and orofacial formalin test, respectively. Balance and motor function were evaluated using rotarod and wire grip tests.ResultsAn increased anxiety-like behavior was observed in swim stress rats in comparison with control and sham subjects. Response to acute and chronic noxious stimuli in the trigeminal region was increased in the stressed rats. Motor and balance function were not altered following stress.ConclusionsResults of the current study demonstrated a hyperalgesic state in the trigeminal region in a possible animal model of FM. This study provides a reliable animal model for further research on the possible mechanisms of orofacial pain in FM.© 2017 American Academy of Pain Medicine. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com

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