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KMID : 0363120220350010022
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Korean Journal of Pain
2022 Volume.35 No. 1 p.22 ~ p.32
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The role of basolateral amygdala orexin 1 receptors on the modulation of pain and psychosocial deficits in nitroglycerin-induced migraine model in adult male rats
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Askari-Zahabi Khadijeh
Abbasnejad Mehdi
Kooshki Razieh
Raoof Maryam
Esmaeili-Mahani Saeed
Pourrahimi Ali Mohammad
Zamyad Mahnaz
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Abstract
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Background: Migraine headaches have been associated with sensory hyperactivity and anomalies in social/emotional responses. The main objective of this study was to evaluate the potential involvement of orexin 1 receptors (Orx1R) within the basolateral amygdala (BLA) in the modulation of pain and psychosocial dysfunction in a nitroglycerin (NTG)-induced rat model of migraine.
Methods: Adult male Wistar rats were injected with NTG (5 mg/kg, intraperitoneal) every second day over nine days to induce migraine. The experiments were done in the following six groups (6 rats per group): untreated control, NTG, NTG plus vehicle, and NTG groups that were post-treated with intra-BLA microinjection of Orx1R antagonist SB-334867 (10, 20, and 40 nM). Thermal hyperalgesia was assessed using the hot plate and tail-flick tests. Moreover, the elevated plus maze (EPM) and open field (OF) tests were used to assess anxiety-like behaviors. The animals’ sociability was evaluated using the three-chamber social task. The NTG-induced photophobia was assessed using a light-dark box.
Results: We observed no change in NTG-induced thermal hyperalgesia following administration of SB-334867 (10, 20, and 40 nM). However, SB-334867 (20 and 40 nM) aggravated the NTG-induced anxiogenic responses in both the EPM and OF tasks. The NTG-induced social impairment was overpowered by SB-334867 at all doses. Time spent in the dark chamber of light-dark box was significantly increased in rats treated with SB-334867 (20 and 40 nM/rat).
Conclusions: The findings suggest a role for Orx1R within the BLA in control comorbid affective complaints with migraine in rats.
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KEYWORD
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Amygdala, Anxiety, Basolateral Nuclear Complex, Hyperalgesia, Migraine Disorders, Nitroglycerin, Orexins, Orexin Receptors, Orexin Receptor Antagonists, Rats
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