Morphine sensitization in the pentylenetetrazole-induced clonic seizure threshold in mice: role of nitric oxide and μ receptors
| Autor: | Nazanin Baradaran, Tina Kabiri, Leila Moezi, Ahmad Reza Dehpour, Hamed Shafaroodi, Siavash Dehpour |
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| Rok vydání: | 2010 |
| Předmět: |
Male
Narcotics medicine.drug_class Narcotic Antagonists Receptors Opioid mu Pharmacology Nitric Oxide Naltrexone Nitric oxide Behavioral Neuroscience chemistry.chemical_compound Mice Opioid receptor Seizures medicine Animals Enzyme Inhibitors Sensitization biology Seizure threshold Dose-Response Relationship Drug Morphine Chemistry Antagonist Nitric oxide synthase Disease Models Animal medicine.anatomical_structure NG-Nitroarginine Methyl Ester Neurology Anesthesia biology.protein Pentylenetetrazole Neurology (clinical) medicine.drug |
| Zdroj: | Epilepsybehavior : EB. 20(4) |
| ISSN: | 1525-5069 |
| Popis: | Behavioral sensitization occurs after repeated administration of μ-opioid receptor agonists following a drug-free period. It seems that the changes in dopaminergic systems induced by μ-opioid receptor agonists play a crucial role in behavioral sensitization to opioids. Nitric oxide also plays a role in some behavioral effects of morphine, including sensitization to the locomotor-stimulating effect. This study investigated whether morphine sensitization appears in seizure threshold and the possible role of μ-opioid receptor and nitric oxide in this sensitization. Sensitization was produced by daily injections of morphine (0.1, 0.5, 1, 5, 15, or 30 mg/kg), followed by a 10-day washout period. Then the challenge test was performed using morphine (0.1, 0.5, 1, 5, 15, or 30 mg/kg) in different groups. To assess clonic seizure threshold, pentylenetetrazole (PTZ) was administered intravenously. Subcutaneous administration of morphine (0.1 and 0.5 mg/kg) induced sensitization in PTZ-induced clonic seizures in mice. Intraperitoneal administration of L-NAME (20 mg/kg), a nonselective inhibitor of nitric oxide synthase, or naltrexone (10 mg/kg), an opioid receptor antagonist, along with morphine inhibited morphine-induced sensitization in PTZ-induced seizure threshold. In conclusion, at low doses, morphine induces sensitization in PTZ-induced clonic seizures in mice probably as a result of the interaction with μ-receptors and nitric oxide. |
| Databáze: | OpenAIRE |
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