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Place conditioning with morphine and phencyclidine: dose dependent effects.

G A Barr, W Paredes, W H Bridger

    Life Sciences
    |January 28, 1985
    PubMed
    Summary
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    Rats showed a preference for environments associated with morphine, demonstrating dose-dependent effects. Phencyclidine (PCP) did not elicit preference and sometimes caused aversion, indicating distinct drug-induced place conditioning.

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Behavioral Science

    Background:

    • Drug addiction and abuse are significant public health concerns.
    • Understanding the neural and behavioral mechanisms of drug reward is crucial for developing effective treatments.
    • Place conditioning is a valuable behavioral paradigm for assessing the rewarding or aversive properties of drugs.

    Purpose of the Study:

    • To investigate the rewarding and aversive effects of morphine and phencyclidine (PCP) using a place conditioning paradigm in rats.
    • To determine the dose-dependent effects of morphine on place preference.
    • To compare the effects of morphine and PCP on conditioned place preference.

    Main Methods:

    • Rats were conditioned to associate one of two environments with drug (morphine or PCP) or vehicle (saline) administration.

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  • Following a drug-free period, place preference was assessed by allowing rats free access to both environments and measuring time spent in each.
  • Dose-response relationships for morphine were examined by comparing various doses to a standard dose.

    • Main Results:

    • Morphine administration resulted in a significant place preference compared to saline.
    • A dose-dependent effect of morphine was observed: lower doses were less preferred, while higher doses were more preferred.
    • Phencyclidine (PCP) did not produce a place preference over saline and, in some cases, led to conditioned place aversion.

    Conclusions:

    • Morphine exhibits rewarding properties that are dependent on the dose administered.
    • PCP does not appear to be rewarding in this paradigm and can produce aversive effects.
    • The dose-dependent effects of morphine in this paradigm allow for more nuanced investigations into drug reward and addiction.