Is stimulation of both D1 and D2 receptors necessary for the expression of dopamine-mediated behaviors?

Recent electrophysiological findings have indicated that D1 dopamine (DA) receptor stimulations by SKF 38393 enables the inhibitory effects of the D2 receptor agonist quinpirole on nucleus accumbens neurons. In the present study, a similar interaction was shown for quinpirole-induced stereotyped behaviors. In control rats, SKF 38393 enhanced the stereotyped responses induced by quinpirole, converting lower-level stereotypies (sniffing and rearing) to more intense oral behaviors (licking and gnawing). In rats depleted of DA (79% reduction) by the tyrosine hydroxylase inhibitor α-methyl-p-tyrosine (AMPT), the behavioral effects of quinpirole were abolished. However, quinpirole-induced stereotyped responses were reinstated by SKF 38393 suggesting that D1 receptor stimulation by endogenous DA is necessary for D2 receptor-mediated stereotyped responses (sniffing, rearing). In support of this suggestion, stereotyped behaviors produced by the non-selective D1/D2 agonist apomorphine were not affected by AMPT pretreatment. In contrast to the effects of quinpirole, the ability of SKF 38393 to induce grooming responses was not abolished by AMPT pretreatment or by combined pretreatment with AMPT and reserpine (>99% DA depletion). These results indicate that D1 receptor stimulation enables D2 receptor-mediated stereotyped responses, but that this relationship is not reciprocal since D2 receptor stimulation is not necessary for the grooming response elicited by SKF 38393.