Didem AKÇALI, Ahmet Deniz BELEN, Hayrunnisa BOLAY, Avni BABACAN

Nitroglycerin challenge induces lateralized headache in nasociliary nerve-ligated rats: implications for chronic migraine

Background/aim: Chronic migraine is a common debilitating disease with limited treatment options. We aimed to develop a novel model for chronic migraine by ligating the nasociliary nerve (NCL) and administering nitroglycerin (NTG) to exacerbate acute headache attacks. Materials and methods: Exacerbation of the headache was induced by NTG (10 mg/kg, subcutaneously) administered to male Wistar rats (n = 36) 14 days following unilateral NCL. Cutaneous and cold allodynia was tested using Von Frey (VF) filaments and acetone, respectively. Elevated plus maze (EPM) results and c-fos immunoreactivity of TNC were investigated. Results: NTG administration significantly decreased VF threshold values only in the nasociliary nerve (NCN) territory and the ipsilateral forepaw (P = 0.0001, P = 0.02). Cold allodynia developed in bilateral NCN territories (P = 0.013). The number/rate of entrance to open arms in the EPM was significantly decreased in NCN-ligated rats (P = 0.042, P = 0.035). Immunohistochemistry disclosed significantly increased c-fos-positive neurons in ipsilateral brainstem TNC compared to the contralateral side (brain stem LI ipsilateral 25.4 ± 4.7, contralateral 11.8 ± 1.9, P < 0.05) in chronic NCN-ligated rats exposed to acute NTG. Conclusion: The presented model provides a valid chronic migraine model relevant to humans, as NTG challenge in chronic NCL rats generated lateralized headache with cephalic and extracephalic allodynia, altered cold sensitivity, anxiety, and neuronal activation in the nociceptive laminae of brainstem trigeminal pain nuclei.

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