TY - JOUR ID - 82781 TI - Anti-nociceptive Mechanisms of Testosterone in Unilateral Sciatic Nerve Ligated Male Rat JO - Iranian Journal of Veterinary Medicine JA - IJVM LA - en SN - 2251-8894 AU - Rezaei, Sahar AU - Asghari, Ahmad AU - Hassanpour, Shahin AU - Arfaei, Farnoosh AD - Graduate student, Faculty of Veterinary Medicine, Science and Research Branch, Islamic Azad University, Tehran, Iran AD - Department of Clinical Science, Science and Research Branch, Islamic Azad University, Tehran, Iran AD - Division of Physiology, Department of Basic Sciences, Faculty of Veterinary Medicine, Science and Research Branch, Islamic Azad University, Tehran, Iran. AD - Department of Clinical Sciences, Faculty of Veterinary Medicine, Science and Research Branch, Islamic Azad University, Tehran, Iran Y1 - 2022 PY - 2022 VL - 16 IS - 1 SP - 36 EP - 45 KW - Anti-nociceptive KW - Dopaminergic KW - GABAergic KW - rat KW - Sciatic nerve injury KW - Testosterone DO - 10.22059/ijvm.2021.314813.1005143 N2 -  BACKGROUND: Neuropathic pain is a chronic condition which is mediated by complex mechanisms exerted by the release of nerve neurotransmitter. A correlation exists between the sex hormones and neuropathic pain, however many aspects of this correlation still remain unclear. OBJECTIVES: The aim of the current study was to determine the anti-nociceptive activity of testosterone and its interaction with the opioidergic, GABAergic, and dopaminergic receptors in sciatic nerve-ligated male rats. METHODS: In this study, 170 adult male rats were randomly allocated into the 4 experimental groups following the sciatic nerve ligation. In the experimental group 1, the animals were injected intraperitoneally (i.p.) with saline, testosterone (10 and 15 mg/kg), and morphine (5 mg/kg), and 30 minutes later with formalin into the plantar surface of the right paw. In the experimental group 2, the animals were injected with saline, testosterone (15 mg/kg), nalox-one (2 mg/kg), and testosterone (15 mg/kg)+naloxone (2 mg/kg). In the groups 3 and 4, flumazenil (5 mg/kg) and yohimbine (2 mg/kg) were injected instead of naloxone. Then, the time spent for paw licking was monitored for the first and second phases after the formalin injection. RESULTS: According to the results, the injection of testosterone in a dose dependent manner decreased the time of licking and biting in the injected paw compared to the control group (P<0.05). Likewise, pretreatment with na-loxone or flumazenil significantly decreased the anti-nociceptive effect of testosterone (P<0.05). While pretreatment with yohimbine significantly increased the anti-nociceptive effect of testosterone (P<0.05). CONCLUSIONS: These results suggested testosterone has an anti-nociceptive activity and this effect is mediated by the opioidergic, GABAergic, and dopaminergic receptors in the sciatic nerve-ligated male rat. UR - https://ijvm.ut.ac.ir/article_82781.html L1 - https://ijvm.ut.ac.ir/article_82781_b5689b25d9aaa8631cd45acc0b70f315.pdf ER -