AU - Khakpour-Taleghani, Behrooz AU - Reisi, Zahra AU - Haghparast, Abbas TI - The Blockade of D1/D2-Like Dopamine Receptors within the Dentate Gyrus of Hippocampus Decreased the Reinstatement of Morphine-Extinguished Conditioned Place Preference in Rats PT - JOURNAL ARTICLE TA - BCN JN - BCN VO - 6 VI - 2 IP - 2 4099 - http://bcn.iums.ac.ir/article-1-612-en.html 4100 - http://bcn.iums.ac.ir/article-1-612-en.pdf SO - BCN 2 AB  - Introduction: The hippocampus (HIP), the primary brain structure related to learning and memory, receives sparse but comprehensive dopamine innervations and contains dopamine D1/D2-like receptors. It is demonstrated that dopamine receptors in dentate gyrus (DG) region of HIP have a remarkable function in spatial reward processing. Much less is known about the involvement of HIP and its D1/D2 dopamine receptors in drug-seeking behaviors, more particularly, in the morphine extinguished conditioned place preference (CPP). Methods: To find out the role of D1/D2-like receptors within the DG in morphine-seeking behaviors, forty adult male albino Wistar rats weighing 220-280g were unilaterally implanted by a cannula into the DG. The CPP paradigm was done conditioning score and locomotors activity were recorded by Ethovision software. All drugs/vehicles were microinjected one day after extinction (just before the CPP test) into the DG as reinstatement day. Results: The results showed that intra-DG administration of different dose of SCH23390 (0.25, 1 and 4μg/0.5μl saline), as a selective D1-like receptor antagonist and sulpiride (0.25, 1 and 4μg/0.5μl DMSO), as a selective D2-like receptor antagonist dose-dependently attenuated the morphine-extinguished CPP reinstated by priming injection of morphine (1 mg/kg, sc). Discussion: It can be concluded that D1/D2-like receptors within this region have an important role in morphine-seeking behaviors in extinguished rats. CP - IRAN IN - Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, ‎P.O.Box 19615-1178, Tehran, Iran LG - eng PB - BCN PG - 73 PT - Original YR - 2015