The Involvement of D1 and D2 Dopamine Receptors in Cocaine Self-Administration
dc.contributor.advisor | Michael Forster | |
dc.contributor.committeeMember | Patricia A. Gwirtz | |
dc.contributor.committeeMember | Thomas Yorio | |
dc.creator | Peltier, Rachel | |
dc.date.accessioned | 2019-08-22T21:22:45Z | |
dc.date.available | 2019-08-22T21:22:45Z | |
dc.date.issued | 1996-06-01 | |
dc.date.submitted | 2013-09-23T13:42:07-07:00 | |
dc.description.abstract | Peltier, Rachel L., The Involvement of D1 and D2 Dopamine Receptors in Cocaine Self-Administration. Doctor of Philosophy (Biomedical Sciences), June 1996, 195 pp. introduction, 6 chapters, discussion, bibliography, 91 titles. D1 and D2 dopamine receptor subtypes have been implicated in producing the reinforcing properties of cocaine. Chronic exposure to cocaine produces tolerance to its reinforcing effects in rats trained to self-administer cocaine. The time between cocaine reinforcers (ISRT) is directly related to dose. A three-point dose-response curve (0.125, 0.25 and 0.5 mg/inj) for cocaine self-administration is obtained during a single test session, allowing determination of optimal tolerance effects of cocaine (20 mg/kg/8 hr/7 days; IP) as demonstrated by a shift of the curve to the right. To test if pharmacokinetic factors contribute to the development of tolerance to the reinforcing properties of cocaine (20 mg/kg/8hr/7days; IP), cocaine and benzoylecgonine (metabolite) were measured in the plasma and brains of rats given a challenge injection of cocaine (2.0 mg/kg; I.V.). Chronic cocaine did not reduce the concentration of cocaine must be due to pharmacodynamics changes. Acute pretreatment with either the direct dopamine agonists d-amphetamine (0.32-3.2 mg/kg) or methamphetamine (1.0 mg/kg) did not consistently change cocaine self-administration. Chronic high-dose treatment with d-amphetamine and methamphetamine produced cross-tolerance to the reinforcing effects of cocaine but apomorphine (0.32-3.2 mg/kg) did not. In contrast, acute pretreatment with dopamine antagonists; flupentixol (mixed D1 and D2, 0.032-1.0 mg/kg), SCH23390 (specific D1, 0.0032-0.32 mg/kg), or eticlopride (specific D2, 0.0032 -3.2 mg/kg); dose-dependently decreased the reinforcing effects of cocaine (ISRT). Chronic treatment with mixed of D1 antagonists (flupentixol, 3.2 mg/kg/12 hr/5 days; or SCH23390, 0.25 mg/kg/12 hr/7 days) produced sensitization to the reinforcing effects of cocaine, but the D2 antagonist eticlopride (0.25 mg/kg/12 hr/7 days) produced cross-tolerance to the reinforcing effects of cocaine. In summary, both the D1 and D2 receptor subtypes seem to be involved in the acute effects of cocaine; however, the development of tolerance to cocaine appears to involve only the D1 receptor subtype. | |
dc.format.mimetype | application/pdf | |
dc.identifier.uri | https://hdl.handle.net/20.500.12503/29287 | |
dc.language.iso | en | |
dc.provenance.legacyDownloads | 0 | |
dc.subject | Behavior and Behavior Mechanisms | |
dc.subject | Comparative and Laboratory Animal Medicine | |
dc.subject | Life Sciences | |
dc.subject | Medical Physiology | |
dc.subject | Medicine and Health Sciences | |
dc.subject | Other Pharmacy and Pharmaceutical Sciences | |
dc.subject | Pharmacy and Pharmaceutical Sciences | |
dc.subject | Substance Abuse and Addiction | |
dc.subject | Toxicology | |
dc.subject | D1 | |
dc.subject | D2 | |
dc.subject | Dopamine Receptor | |
dc.subject | Cocaine | |
dc.subject | Self-Administration | |
dc.subject | rats | |
dc.subject | ISRT | |
dc.subject | optimal tolerance | |
dc.subject | effects | |
dc.title | The Involvement of D1 and D2 Dopamine Receptors in Cocaine Self-Administration | |
dc.type | Dissertation | |
dc.type.material | text | |
thesis.degree.department | Graduate School of Biomedical Sciences | |
thesis.degree.discipline | Biomedical Sciences | |
thesis.degree.grantor | University of North Texas Health Science Center at Fort Worth | |
thesis.degree.name | Doctor of Philosophy |
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