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Chronic variable stress or chronic morphine facilitates immobility in a forced swim test: reversal by naloxone

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Abstract

The behaviors displayed in a forced swim test were investigated in rats previously exposed to a chronic variable stress treatment or chronic administration of morphine. In addition, to further explore the participation of an endogenous opiate mechanism in these behavioral effects, naloxone was either administered during the chronic treatment (prior to each stress or morphine exposure) or immediately prior to the forced swim test. Animals were submitted daily to a different stressor for 1 week or injected with morphine (10 mg/kg, IP) for 6 days, whereas controls were unmanipulated except for the injection process. On the day following the last stressor, control and stressed animals were administered saline or naloxone (2 mg/kg, IP) 15 min prior to the forced swim test. Morphine treated animals were similarly tested on the third day following the last morphine injection. In a separate group of rats, naloxone (2 mg/kg, IP) was administered daily 10 min prior to each stressor of the chronic stress regime or each daily morphine injection. A significant increase in the time spent in immobility was observed in stressed animals as well as in rats chronically treated with morphine. In both groups, this potentiated immobility was attenuated by naloxone pretreatment prior to the forced swim test or when given before each daily stressor or morphine injection. In addition, the concurrent exposure to stress or morphine along with naloxone administration enhanced struggling in the first 5 min of the forced swim test. Taken together, the results of these experiments support the conclusion that the increase in immobility seen following chronic variable stress or repeated morphine exposure is modulated by the activation of an endogenous opiate mechanism, given that this effect is attenuated by naloxone administration.

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  1. Center for Development Psychobiology, Department of Psychology, Binghamton University, State University of New York, 13902-6000, Binghamton, NY, USA

    Victor A. Molina, Charles J. Heyser & Linda Patia Spear

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  1. Victor A. Molina
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  2. Charles J. Heyser
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  3. Linda Patia Spear
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Molina, V.A., Heyser, C.J. & Spear, L.P. Chronic variable stress or chronic morphine facilitates immobility in a forced swim test: reversal by naloxone. Psychopharmacology 114, 433–440 (1994). https://doi.org/10.1007/BF02249333

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  • DOI: https://doi.org/10.1007/BF02249333

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