4.5 Article

CGRP induces migraine-like symptoms in mice during both the active and inactive phases

Journal

JOURNAL OF HEADACHE AND PAIN
Volume 22, Issue 1, Pages -

Publisher

BMC
DOI: 10.1186/s10194-021-01277-9

Keywords

Migraine; Circadian patterns; CGRP; Light aversion; Movement; Wheel running

Funding

  1. NIH [R01 NS 075599]

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The study aimed to test the validity of CGRP-induced migraine-like symptoms in mice by comparing responses during the active and inactive phases. The results showed that peripheral administration of CGRP decreased mouse activity, induced light aversive behavior, and spontaneous pain, regardless of the time of day or night. This suggests that preclinical assessment of migraine-like phenotypes can be done during the more convenient inactive phase of mice.
Background Circadian patterns of migraine attacks have been reported by patients but remain understudied. In animal models, circadian phases are generally not taken into consideration. In particular, rodents are nocturnal animals, yet they are most often tested during their inactive phase during the day. This study aims to test the validity of CGRP-induced behavioral changes in mice by comparing responses during the active and inactive phases. Methods Male and female mice of the outbred CD1 strain were administered vehicle (PBS) or CGRP (0.1 mg/kg, i.p.) to induce migraine-like symptoms. Animals were tested for activity (homecage movement and voluntary wheel running), light aversive behavior, and spontaneous pain at different times of the day and night. Results Peripheral administration of CGRP decreased the activity of mice during the first hour after administration, induced light aversive behavior, and spontaneous pain during that same period of time. Both phenotypes were observed no matter what time of the day or night they were assessed. Conclusions A decrease in wheel activity is an additional clinically relevant phenotype observed in this model, which is reminiscent of the reduction in normal physical activity observed in migraine patients. The ability of peripheral CGRP to induce migraine-like symptoms in mice is independent of the phase of the circadian cycle. Therefore, preclinical assessment of migraine-like phenotypes can likely be done during the more convenient inactive phase of mice.

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