Patterns of cocaine self-administration in rats produced by various access conditions under a discrete trials procedure.

Abstract:

:Frequency of drug access greatly affects the pattern and stability of cocaine self-administration. Previous research has shown that restricted drug availability produces remarkably consistent levels of daily cocaine intake, whereas increased or unlimited access produces more variable patterns of self-administration that may change over time. In the present study we used a discrete trials (DT) procedure to document how levels of access affect the pattern of cocaine intake. Rats that had been implanted with a chronically indwelling jugular cannula and trained to self-administer cocaine on an FR1 schedule were given access to cocaine during 10-min DT that were initiated throughout the day/night cycle for 21 days. Frequency of access (2, 3, 4 or 5 trials/h; 1.5 mg/kg/inj) and dose (1.0, 1.5, 2.0 and 2.5 mg/kg/inj, 3 trials/h) were investigated in separate groups of rats. When rats were presented with two or three trials an hour (1.5 mg/kg/inj), a highly regular and circadian pattern of intake was observed across weeks. Increasing the number of trials or increasing the unit dose resulted in a significant increase in average daily cocaine intake. Access to higher dose or higher frequency conditions produced a sustained drug-taking binge during the first few days on the schedule. Rats given access to five trials per hour typically responded at every opportunity for more than 48 h, then stabilized within a range of 80-100 mg/kg/day for the remainder of the experiment. To assess whether such high levels of cocaine intake had altered the motivation to respond, cocaine reinforced break-points were assessed on a progressive ratio schedule (0.32, 1.5 and 3.0 mg/kg/inj) in separate groups of animals before and 24 h after 5 days access on the DT procedure (5 trial/h). Sustained exposure to high levels of cocaine produced a shift in the dose-response curve to the right indicating tolerance to the reinforcing effects. This DT procedure provides a method to examine the behavioral and neurochemical effects of high cocaine intake over extended periods without toxicity.

journal_name

Drug Alcohol Depend

authors

Roberts DC,Brebner K,Vincler M,Lynch WJ

doi

10.1016/s0376-8716(02)00083-2

keywords:

subject

Has Abstract

pub_date

2002-08-01 00:00:00

pages

291-9

issue

3

eissn

0376-8716

issn

1879-0046

pii

S0376871602000832

journal_volume

67

pub_type

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