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• W2084473053 abstract "Changes in intracranial self-stimulation (ICSS) evoked from ventral tegmental area-substantia nigra (VTA-SN) and lateral hypothalamus-medial forebrain bundle (LH-MFB) before and after microinjections of sulfated cholecystokinin octapeptide (CCK-8S) and unsulfated cholecystokinin (CCK-8US), neurotensin tridecapeptide ([D-Tyr11]NT(1-13) or [DTrp11]NT(1-13)) into either VTA-SN or LH-MFB were assessed. The current intensity was fixed at a level to obtain 60-70% of the maximal asymptotic rate. CCK-8S (0.10 microg/0.5 microl and 0.25 microg/0.5 microl) into VTA-SN resulted in dose-dependent decreases in VTA-SN ICSS of 38-42% and 78-92%, respectively, without affecting the ICSS of LH-MFB. Similar doses of CCK-8S injected into LH-MFB changed neither LH-MFB ICSS nor VTA-SN ICSS. CCK-8Us injected into VTA-SN or LH-MFB had no effect on ICSS in either site. Intra-VTA-SN injections of the neurotensin-1 (NT1) receptor agonist [DTyr11]NT(1-13) and the NT1 receptor antagonist [D-Trp11]NT(1-13) at doses of 5 microg/0.5 microl and 10 microg/0.5 microl decreased VTA-SN ICSS. NT1 receptor agonist and antagonist injections did not alter LH-MFB ICSS in any significant manner. Similar injections of these peptides into LH-MFB did not change the responding rates for LH-MFB ICSS or VTA-SN ICSS. Increasing the current intensity reversed the inhibitory effect of CCK-8S and [D-Trp11]NT(1-13) on VTA-SN ICSS and restored basal preinjection rates of responding. These results suggest that CCK(A) and NT1 receptor mechanisms in the ventral tegmentum in association with dopamine neurotransmission may be important in mediating the rewarding effects of VTA-SN ICSS but not LH-MFB ICSS." @default.
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• W2084473053 date "1997-12-01" @default.
• W2084473053 modified "2023-10-17" @default.
• W2084473053 title "Effects of Microinjections of Cholecystokinin and Neurotensin into Lateral Hypothalamus and Ventral Mesencephalon on Intracranial Self-Stimulation" @default.
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• W2084473053 doi "https://doi.org/10.1016/s0091-3057(97)00040-3" @default.
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