Interaction between gamma-aminobutyric acid GABAB and cannabinoid CB1 receptors in spinal pain pathways in rat

Antinociceptive effects of cannabinoids are mediated, in part, at the spinal level. Cannabinoid CB1 receptors are co-localized with dorsal horn interneurons containing gamma-aminobutyric acid (GABA). In this study, we investigated the interaction between intrathecally administered cannabinoid and GABA(B) receptor agonists and antagonists in the modulation of formalin-induced pain at the spinal level. Intrathecal pretreatment of rats with a cannabinoid receptor antagonist [N-(piperidin-1-yl)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1-H-pyrazole-3-carboxamide] (SR141716A, 30 microg) decreased the analgesic effect of the intrathecal administration of the GABA(B) receptor agonist, baclofen (0.125 microg and 0.25 microg). Intrathecal administration of the GABA(B) receptor antagonist, saclofen (30 microg), 10 min before administration of the cannabinoid receptor agonist (-)-cis-3-[2-hydroxy-4-(1,1-dimethylheptyl)-phenyl]-trans-4-(3-hydroxy-propyl)-cyclohexano (CP55940), did not affect the analgesia produced by the cannabinoid receptor agonist. Our results confirm that intrathecal administration of cannabinoid and GABA(B) receptor agonists have analgesic effects and that spinal antinociceptive effects of GABA(B) receptor agonists are likely through endocannabinoid modulation.     

Psychometric features of Neuropathic Pain Symptom Inventory in Iranian people with Parkinson’s disease

Neurological Sciences - Neuropathic pain is a type of pain reported in people with Parkinson’s disease. There are various scales to evaluate the characteristics of this kind of pain. The...     

Fiberoptic endoscopic evaluation of swallowing findings in individuals with Zenker’s diverticulum and cricopharyngeal bar

European Archives of Oto-Rhino-Laryngology - To assess fiberoptic endoscopic evaluation of swallowing (FEES) findings in individuals with cricopharyngeal bar (CPB) and Zenker’s diverticulum...