Differential Roles of the D1- and D2-Like Dopamine Receptors Within the Ventral Tegmental Area in Modulating the Antinociception Induced by Forced Swim Stress in the Rat.

Autor: Saghafi M; Pharmacology and Toxicology Department, Faculty of Pharmacy and Pharmaceutical Sciences, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran., Danesh E; Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, P.O.Box: 19615-1178, Tehran, Iran., Askari R; Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, P.O.Box: 19615-1178, Tehran, Iran., Mousavi Z; Pharmacology and Toxicology Department, Faculty of Pharmacy and Pharmaceutical Sciences, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran., Haghparast A; Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, P.O.Box: 19615-1178, Tehran, Iran. Haghparast@yahoo.com.; School of Cognitive Sciences, Institute for Research in Fundamental Sciences, Tehran, Iran. Haghparast@yahoo.com.; Department of Basic Sciences, Iranian Academy of Medical Sciences, Tehran, Iran. Haghparast@yahoo.com.
Jazyk: angličtina
Zdroj: Neurochemical research [Neurochem Res] 2024 Jan; Vol. 49 (1), pp. 143-156. Date of Electronic Publication: 2023 Aug 29.
DOI: 10.1007/s11064-023-04017-4
Abstrakt: Several preclinical and clinical studies indicate that exposure to acute stress may decrease pain perception and increases pain tolerance. This phenomenon is called stress-induced analgesia (SIA). A variety of neurotransmitters, including dopamine, is involved in the SIA. Dopaminergic neurons in the mesolimbic circuits, originating from the ventral tegmental area (VTA), play a crucial role in various motivational, rewarding, and pain events. The present study aimed to investigate the modulatory role of VTA dopaminergic receptors in the antinociceptive responses evoked by forced swim stress (FSS) in a model of acute pain. One hundred-five adult male albino Wistar rats were subjected to stereotaxic surgery for implanting a unilateral cannula into the VTA. After one week of recovery, separate groups of animals were given different doses of SCH23390 and Sulpiride (0.25, 1, and 4 µg/0.3 µl) as D1- and D2-like receptor antagonists into the VTA, respectively. Then, the animals were exposed to FSS for a 6-min period, and the pain threshold was measured using the tail-flick test over a 60-min time set intervals. Results indicated that exposure to FSS produces a prominent antinociceptive response, diminishing by blocking both dopamine receptors in the VTA. Nonetheless, the effect of a D1-like dopamine receptor antagonist on FSS-induced analgesia was more prominent than that of a D2-like dopamine receptor antagonist. The results demonstrated that VTA dopaminergic receptors contribute to the pain process in stressful situations, and it might be provided a practical approach to designing new therapeutic agents for pain management.
(© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
Externí odkaz: