title: Involvement of opioid receptors in the systemic and peripheral antinociceptive actions of montelukast in the animal models of pain.
abstract: This study aimed to investigate the involvement of opioid receptors in the systemic and peripheral antinociceptive activities of montelukast in different animal models of pain. Rats and mice were injected with montelukast to produce analgesia. The formalin and acetic acid-induced writhing tests were used to assess the nociceptive activity. The results showed that i.p. administration of montelukast (0.3-10mg/kg) dose-dependently reduced flinching behavior in both the first and second phases of formalin test with mean ED50 of 0.55 and 5.31mg/kg, respectively. Also, intraplantar administration of montelukast (3-30μg/paw) produced antinociception against the two phases of formalin assay in a dose-dependent way with mean ED30 of 2.92 and 8.11μg/paw, respectively. Furthermore, pre-treatment with naloxone (a non-selective opioid receptor antagonist) significantly inhibited both the systemic and also peripheral antinociceptive actions of montelukast in formalin test. In writhing test, the results showed that intraperitoneal administration of montelukast (3-10mg/kg) significantly reduced the writhe number induced by acetic acid in mice. Moreover, co-administration of non-effective doses of montelukast (0.3 and 1mg/kg; i.p.) and morphine (0.25mg/kg; i.p.) significantly decreased the writhes number induced by acetic acid. Also, this effect was naloxone-reversible. These findings suggest that the systemic and peripheral antinociception produced by montelukast were mediated through the opioid receptors in central and peripheral nervous systems. Moreover, combination of montelukast and morphine could be noted as a new strategy for pain relief.
authors.affiliation: Dept. of Pharmacology, School of Medicine, Dezful University of Medical Sciences, Dezful, Iran.
authors.forename: Behnam
authors.initials: B
authors.lastname: Ghorbanzadeh
authors.affiliation: Dept. of Pharmacology, Physiology Research Center, School of Medicine, Ahvaz Jundishapur University of Medical Sciences (AJUMS), Ahvaz, Iran. Electronic address: mansouri_smt@yahoo.com.
authors.forename: Mohammad Taghi
authors.initials: MT
authors.lastname: Mansouri
authors.affiliation: Neuroscience Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
authors.forename: Hedayat
authors.initials: H
authors.lastname: Sahraei
authors.affiliation: Dept. of Pharmacology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences (AJUMS), Ahvaz, Iran.
authors.forename: Soheila
authors.initials: S
authors.lastname: Alboghobeish
mesh_terms: D000085:Acetates / Q000008:administration & dosage* / Q000494:pharmacology* / Q000627:therapeutic use; D019342:Acetic Acid / Q000009:adverse effects; D000700:Analgesics / Q000494:pharmacology* / Q000627:therapeutic use; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D003521:Cyclopropanes; D004195:Disease Models, Animal; D004357:Drug Synergism; D005557:Formaldehyde / Q000009:adverse effects; D008297:Male; D051379:Mice; D009270:Naloxone / Q000494:pharmacology; D010146:Pain / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism*; D011804:Quinolines / Q000008:administration & dosage* / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D011957:Receptors, Opioid / Q000378:metabolism*; D013440:Sulfides; D059265:Visceral Pain / Q000188:drug therapy
chemical_list: D000085:Acetates; D000700:Analgesics; D003521:Cyclopropanes; D011804:Quinolines; D011957:Receptors, Opioid; D013440:Sulfides; D005557:Formaldehyde; D009270:Naloxone; C093875:montelukast; D019342:Acetic Acid
keywords: Antinociception; Formalin test; Montelukast; Opioid receptors; Potentiation; Wrighting