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Tolerance to antinociceptive effects of morphine without tolerance to its effects on schedule-controlled behavior

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Abstract

The development of tolerance to behavioral effects of morphine was investigated in rats that responded on a two-lever, multiple-trial, multiple differential-reinforcement-of-low-rate fixed-ratio (mult DRL FR) schedule of food presentation. Stable performances were maintained when sessions were conducted just twice per week. The effects of cumulative doses of morphine (1.0–8.0 mg/kg) or chlordiazepoxide (CDP; 4.0–32.0 mg/kg) were evaluated once per week; saline injections were given in the intervening sessions. The effects of saline and morphine on nociception were also evaluated in hot-plate tests conducted on the same subjects 15 min after selected operant sessions. Initially, morphine produced dose-related decreases in response rates and reinforcement rates in the DRL and FR components as well as significant increases in hot-plate response latencies. Following weekly administration of morphine (1.0–8.0 mg/kg) for 10 weeks, there was little or no tolerance to its effects on operant behavior. In contrast, complete tolerance developed to the antinociceptive effects of morphine. These results suggest that tolerance to various behavioral effects of morphine may be dissociated, and that the loss of reinforcement may be insufficient by itself to produce tolerance to effects of morphine on operant behavior. Additionally, whereas CDP initially produced only dose-related decreases in DRL and FR response rates, following weekly morphine the smaller doses of CDP (4.0–16.0 mg/kg) produced increases in response rates. Finally, the effects of cumulative doses of morphine did not differ significantly from the effects of noncumulative doses of the drug.

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Authors and Affiliations

  1. Department of Pharmacology, College of Medicine, University of Iowa, 52242, Iowa City, IA, USA

    R. E. Solomon & G. F. Gebhart

  2. Department of Psychology, University of Iowa, 52242, Iowa City, IA, USA

    E. A. Wasserman

Authors
  1. R. E. Solomon
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  2. E. A. Wasserman
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  3. G. F. Gebhart
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Solomon, R.E., Wasserman, E.A. & Gebhart, G.F. Tolerance to antinociceptive effects of morphine without tolerance to its effects on schedule-controlled behavior. Psychopharmacology 92, 327–333 (1987). https://doi.org/10.1007/BF00210839

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  • DOI: https://doi.org/10.1007/BF00210839

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