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[Opiate addiction. Pharmacologic and biochemical aspects]
A Herz1, T S Shippenberg, R Bals-Kubik
1Abteilung Neuropharmakologie, Max-Planck-Instituts für Psychiatrie, München-Martinsried.
Arzneimittel-Forschung
|February 1, 1992
Summary
Opioid receptors (mu, delta, kappa) influence addiction by affecting dopamine release in the brain. This research explores how endogenous opioids bidirectionally regulate the mesolimbic dopamine system, impacting reward and aversion.
Area of Science:
- Neurobiology
- Neuropharmacology
- Addiction Science
Context:
- Advances in understanding opioid neurobiology have deepened insights into opioid addiction.
- This knowledge facilitates a comprehensive understanding of drug addiction mechanisms.
Purpose:
- To elucidate the neurobiological underpinnings of opioid-induced motivational effects.
- To investigate the role of the mesolimbic dopamine system in mediating these effects.
- To explore the bidirectional regulation of dopamine by endogenous opioid systems.
Summary:
- Opioid agonists acting on mu- and delta-receptors induce place preference, while kappa-agonists cause aversion.
- These opposing effects are mediated by interactions with the mesolimbic dopamine system.
- Microdialysis studies reveal mu-agonists increase dopamine in the Nucleus accumbens, whereas kappa-agonists decrease it, suggesting endogenous opioid systems modulate dopamine release.
Impact:
- Provides a framework for understanding the neurobiological basis of reward and aversion in addiction.
- Highlights the critical role of the mesolimbic dopamine system in opioid's effects.
- Suggests potential targets for therapeutic interventions in addiction treatment.