The relationships among saccharin consumption, oral ethanol, and i.v. cocaine self-administration.
- Authors
- Gahtan, E; Labounty, L P; Wyvell, C; Carroll, M E
- Year
- 1996
- Journal
- Pharmacology, biochemistry, and behavior
- PMID
- 8801598
- DOI
- 10.1016/0091-3057(95)02148-5
The purpose of the present experiment was to replicate previously reported observations of a relationship between saccharin consumption and oral ethanol self-administration in rats using operant measures (2,8) and to determine whether saccharin intake was related to the rate of acquisition of IV cocaine self-administration. Groups of Wistar rats selected for high and low saccharin (0.1% wt/vol) intake were tested for rate of acquisition of IV cocaine (0.2 mg/kg/infusion) self-administration using an autoshaping procedure. They were subsequently tested for self-administration of oral ethanol (8% wt/vol) under ascending fixed-ratio (FR) schedules (FR 1, 2, 4, and 8). Finally, ethanol deliveries were compared under food-deprivation and food-satiation conditions under an FR 8 schedule. Saccharin intake was redetermined after each phase of the experiment. No significant differences between high and low saccharin groups were found in rate of acquisition of IV cocaine self-administration, and there was not a significant correlation between saccharin and cocaine consumption. However, the high saccharin group drank significantly more ethanol than the low saccharin group during the FR 8 food satiation component. A significant correlation between saccharin and ethanol consumption was also found. For high and low saccharin groups, responding for ethanol increased proportionally with increases in FR such that consumption of ethanol remained relatively constant as FR increased. Ethanol consumption was significantly increased under food deprivation relative to food satiation conditions for both saccharin groups. A significant correlation between ethanol consumption and cocaine consumption was also found. Significant increases in saccharin consumption across successive saccharin consumption tests were found for both groups, although relative intake for the high and low saccharin groups remained stable throughout the experiment. These results indicate that higher ethanol intake is predicted by higher saccharin intake, but saccharin intake did not predict the rate of acquisition of IV cocaine self-administration.
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