Individual differences in the feeding effects of amphetamine: role of nucleus accumbens dopamine and circadian factors.

Evidence indicates that amphetamine (AMP) affects feeding in a baseline-dependent fashion and that the nucleus accumbens (Acc) is an important site of action for AMP's effects on feeding. Experiment 1 examined the contribution of Acc-dopamine (DA) mechanisms to the baseline-dependent feeding effects of a 0.125 mg/kg dose of AMP using intra-Acc administrations of cis-flupenthixol (FLU). Results showed that there was an inverse relation to AMP, such that AMP stimulated feeding in animals with high baseline intake. Intra-Ace FLU administration reversed the stimulatory but not the inhibitory effect of AMP. Further, intra-Acc FLU attenuated baseline feeding in high but not low baseline feeders. Experiment 2 sought to determine whether AMP would affect feeding in a baseline-dependent manner when administered in the dark photoperiod of the rat circadian cycle, when rats do most of their feeding. To this end, rats were administered three doses (0.05,0.01, and 0.25 mg/kg) of AMP in the dark photoperiod and the intake of sugar monitored. Results showed that in low baseline feeders, AMP stimulated intake at lowest dose and had no effect at higher doses. In high baseline feeders, AMP inhibited intake in a dose-dependent manner. Taken together, these results further establish that AMP affects feeding in a baseline-dependent fashion. Moreover, the similar effects of AMP across the light and dark photoperiods suggest that a straightforward rate-dependency interpretation is not adequate. Finally, it is speculated that Acc-DAergic activity may play a role in the observed differences in baseline intake levels and in the response to AMP.