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  • Title: Non-opiate beta-endorphin fragments and dopamine--III. gamma-Type endorphins and various neuroleptics counteract the hypoactivity elicited by injection of apomorphine into the nucleus accumbens.
    Author: Van Ree JM, Caffé AR, Wolterink G.
    Journal: Neuropharmacology; 1982 Nov; 21(11):1111-7. PubMed ID: 6184640.
    Abstract:
    The hypoactivity in rats induced by small doses of apomorphine, injected bilaterally into the nucleus accumbens area of the brain, could be antagonized by pretreatment with the neuroleptic-like neuropeptide des-enkephalin-gamma-endorphin (DE gamma E, beta-endorphin 6-17) as well as with the neuroleptic drugs haloperidol, sulpiride and clozapine injected into the accumbens. Dose-response studies revealed that a dose of 100 pg DE gamma E completely inhibited the apomorphine-induced hypomotility. The influence of DE gamma E appeared to be specific for gamma-type endorphins, since alpha-type endorphins were inactive in this respect. Treatment with DE gamma E injected into the accumbens for 4 days resulted in an enhancement of apomorphine-induced hypoactivity. It is concluded that gamma-type endorphins may control the activity of dopaminergic transmission in the nucleus accumbens, a suggestion which may be of significance for the purported neuroleptic-like and antipsychotic action of gamma-type endorphins.
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