Newsletter # 06
Animal models
CPP is a well-accepted model to evaluate preferences for a specific environment that has been associated with a positive reward or a drug such as morphine. In the test a positive stimulus is paired with placement into a specific environment. After the conditioning phase, animals are allowed to explore the whole environment: the time spent in the compartments previously associated with the stimulus is used as an indicator of preference and a measure of reward learning.
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Compound testing :CPP is tested in a device (BioSeb, France) composed of 2 large chambers separated by a small corridor and is conducted over a period of 5 days. Day 0 is the habituation phase, where mice are allowed to freely explore the whole apparatus. Day 1 to 3 is the conditioning phase and each day consists of a morning session and an afternoon session. In the morning session the mice are confined to one compartment where they either receive vehicle or drug treatment, whereas they in the afternoon session are confined to the other compartment and all receive a saline treatment. Day 4 is the testing phase, where each mouse is placed in the corridor and allowed to move freely in the whole apparatus. Time spent in the drug-paired compartment is measured and used to determine if the drug has induced conditioned place preference.
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Morphine induce a significant increase in the time spent in the drug-paired compartment.
The base line represents an equal time spent in both chamber. -
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