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[Hypothalamic self-stimulation during the abstinence syndrome in morphine-dependent rats]
Biulleten' Eksperimental'Noi Biologii I Meditsiny
|March 1, 1978
Summary
Chronic morphine administration initially facilitated, then inhibited, lateral hypothalamic self-stimulation in rats. Abstinence and nalorphine also suppressed this reward behavior, indicating morphine dependence.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Context:
- Investigates the effects of chronic opioid administration on reward pathways.
- Examines the role of the lateral hypothalamus in motivated behaviors.
Purpose:
- To determine the impact of chronic morphine on self-stimulation behavior in rats.
- To assess the effects of abstinence and opioid antagonists on morphine-facilitated self-stimulation.
Summary:
- Rats receiving chronic, escalating doses of morphine showed initial facilitation of lateral hypothalamic self-stimulation, starting from the 9th injection.
- Both short-term abstinence (16-18 hours) and administration of the morphine antagonist nalorphine (5 mg/kg) led to the complete suppression of self-stimulation.
Impact:
- Demonstrates the complex, biphasic effects of chronic morphine on reward circuitry.
- Highlights the development of dependence and withdrawal symptoms affecting motivated behavior.
- Provides insights into the neurobiological mechanisms underlying opioid addiction and reward processing.