Boyce S.; Rupniak, N. M. J.; Tye, S.; Steventon, M. J.; Iversen, S. D.Clinical Neuropharmacology: August 1990 Original Contributions: PDF Only Abstract Summary We examined the ability of selective CCK-A and CCK-B receptor antagonists to induce or modulate the locomotor stimulant effects of dopamine agonists in MFTP-treated squirrel monkeys. Administration of 1–100 μg/kg i.p. of either the selective CCK-A receptor antagonist devazepide (MK-329) or the CCK-B receptor antagonist L-365,260 alone failed to stimulate a locomotor response in parkinsonian monkeys. In contrast, treatment with L-365,260 caused a 50–60% potentiation of the locomotor stimulatory effects of L-DOPA or (+)-PHNO. No such modulatory effects were observed following pretreatment with devazepide. We suggest that CCK-B receptor antagonists may be useful adjuncts to existing dopamine replacement therapy for improved management of Parkinson's disease. © Williams & Wilkins 1990. All Rights Reserved.