چاپ صفحه |  صفحه نخست سامانه |  چکیده مقاله |  نویسندگان |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| Long-term exposure to opiates induces tolerance to the analgesic effect and dependence. The purpose of the present study is to investigate the effects of pioglitazone, a peroxisome proliferator-activated receptors gamma (PPAR-γ) agonist, on the morphine-induced tolerance and dependence. Groups of rats received morphine in combination with a vehicle or pioglitazone (5, 10, 20, and 40 mg/kg) daily. Thirty minutes before pioglitazone (40 mg/kg), GW-9662, a selective PPAR-γ antagonist, (2 mg/kg) was administrated in order to evaluate the possible role of the PPAR-γ. Nociception was assessed by a tail flick apparatus, and the percentage of the maximal possible effect was calculated as well. For 9 days, rats received additive doses of morphine to induce dependence. Naloxone was administrated 2 h after the morphine last dose, and withdrawal symptoms were recorded for 45 min. Morphine administration to rats over a duration of 17 days resulted in the development of tolerance, whereas pioglitazone (40 mg/kg) delayed the day of the established tolerance for 15 days. Administration of pioglitazone also prevented morphine-induced 50 % effective dose (ED50) shift to the right in the dose-response curve and increased the global analgesic effect of morphine. In addition, pioglitazone decreased the total withdrawal score significantly, whereas GW-9662 significantly reversed the pioglitazone effects on the morphine tolerance and dependence. The prevention of the morphine-induced glia activation and the proinflammatory responses were the possible mechanisms for pioglitazone effect on delaying themorphine tolerance and attenuating the dependence. |
| نویسنده | نفر چندم مقاله |
|---|---|
| کامبیز حسن زاده | دوم |
| نسرین مالکی دیزجی | سوم |
| المیرا زلالی | ششم |
| محمد چرخ پور | هفتم |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| Pioglitazone prevents morphine.pdf | 1398/03/04 | 825619 | دانلود |
