Intra-periaqueductal grey injection of galanin increases the nociceptive response latency in rats, an effect reversed by naloxone.
نویسندگان
چکیده
The nociceptive response latencies were increased significantly after intra-periaqueductal grey (PAG) administration of 1.0 or 3.0 nmol of galanin, but not 0.3 nmol, in rats. The effect of galanin was attenuated by following injection of 5.5 nmol of naloxone into PAG. These results indicate an anti-nociceptive role of galanin, and a possible interaction between galanin and opioid peptides in PAG in rats.
منابع مشابه
Pii: S0306-4522(00)00005-1
The present study was performed in rats with experimentally induced mononeuropathy after left common sciatic nerve ligation. The hindpaw withdrawal latencies to thermal and mechanical stimulation increased significantly after intra-periaqueductal grey injection of 2 or 3 nmol, but not 1 nmol of galanin in rats with mononeuropathy. Intraperitoneal administration of 4.5 mg/kg morphine induced sig...
متن کاملReversal Effect of Intra-Central Amygdala Microinjection of L-Arginine on Place Aversion Induced by Naloxone in Morphine Conditioned Rats
Background: Role of nitric oxide (NO) on expression of morphine conditioning using a solely classic task has been proposed previously. In this work, the involvement of NO on the expression of opioid-induced conditioning in the task paired with an injection of naloxone was investigated. Methods: Conditioning was established in adult male Wistar rats (weighing 200-250 g) using an unbiased procedu...
متن کاملAntinociceptive Effect of Morphine Microinjections into the Dorsal Hippocampus in the Formalin-Induced Orofacial Pain in Rats
In the present study, the effects of intra-hippocampal microinjections of morphine (an opioid agonist) and naloxone (an opioid antagonist) were investigated in the formalin-induced orofacial pain in rats. Orofacial pain was induced by subcutaneous injection of formalin (1 %, 50 μl) in the upper lip region and the time spent of face rubbing was measured in 3-min blocks for 45 min. Formalin induc...
متن کاملEffects of intra-fourth ventricle injection of crocin on capsaicin-induced orofacial pain in rats
Objectives: Crocin, a constituent of saffron and yellow gardenia, possesses anti-nociceptive effects. In the present study, we investigated the effects of intra-fourth ventricle injection of crocin in a rat model of orofacial pain. The contribution of opioid system was assessed using intra-fourth ventricle injection of naloxone, an opioid receptor antagonist. Materials and Methods: A guide cann...
متن کاملBlockade of the Naloxone-induced Aversion in Morphine-conditioned Wistar Rats by L-Arginine Intra-central Amygdala
Objective(s) Single injection of naloxone, a selective antagonist of morphine, prior to the drug conditioning testing was used to investigate on morphine dependence. Materials and Methods Conditioning to morphine (2.5-10 mg/kg, s.c.) was established in adult male Wistar rats (weighing 200-250 g) using an unbiased procedure. Nitric oxide agents were microinjected into the central amygdala pri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Brain research
دوره 834 1-2 شماره
صفحات -
تاریخ انتشار 1999