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  • Title: Arginine vasopressin enhances retention of morphine tolerance.
    Author: Moore JE.
    Journal: Pharmacol Biochem Behav; 1983 Oct; 19(4):561-5. PubMed ID: 6316368.
    Abstract:
    The hot plate method was used to assess tolerance in rats following daily injections of morphine. Following analgesia assessment, or a time equated rest period, rats were injected with either saline or a pituitary peptide. Arginine vasopressin, but not ACTH 4-10, prolonged the retention of morphine tolerance when assessed five weeks after the last injection. Neither the rate nor the degree of tolerance development were influenced by either peptide. These hormones had no effect on retention of tolerance development were influenced by either peptide. These hormones had no effect on retention of tolerance in rats not assessed for analgesia during the period of tolerance development. The effects of pituitary peptides on morphine tolerance are analogous to the effects they have on learning and memory processes, suggesting that similar adaptational processes are occurring in both phenomena.
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