• Hossein Amini-Khoei, Maryam Rahimi-Balaei, Shayan Amiri, Arya Haj-Mirzaian, Mahsa Hassanipour, Armin Shirzadian, Maziar Gooshe, Sakineh Alijanpour, Shahram Ejtemaie Mehr, and Ahmad Reza Dehpour.
• Experimental Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
• Eur. J. Pharmacol. 2015 Dec 15; 769: 43-7.

AbstractHistamine regulates release of neurotransmitters such as dopamine, serotonin, gamma-aminobutyric acid (GABA), glutamate and also is involved in several functions in central nervous system (CNS). It has been shown that histamine participates in disorders like seizure. It has been well documented that morphine dose-dependently induces anti or proconvulsant effects. In the current study, we firstly showed that morphine (1mg/kg) exerts anticonvulsant effects which significantly reversed by naltrexone administration. Secondly, we determined seizure threshold for H1 and H3 receptors agonists and antagonists in mouse model of pentylenetetrazole (PTZ)-induced clonic seizures. Our results showed that activation of H1 receptors by 2-(2-Pyridyl)-ethylamine exerts anticonvulsant properties while inhibition of H1 receptors by pyrilamine maleate induced proconvulsant effects. Furthermore, we showed that immepip dihydrobromide, a H3 receptor agonist, increased seizure susceptibility to PTZ whereas thioperamide, a H3 receptor antagonist increased seizure threshold. We also revealed that pretreatment with morphine potently reversed the effects of histaminergic system on seizure threshold suggesting the involvement of opioid system in alteration of seizure threshold by histaminergic drugs. Copyright © 2015 Elsevier B.V. All rights reserved.

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