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Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
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Quantifying Synapses: an Immunocytochemistry-based Assay to Quantify Synapse Number
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The Opioid-Addicted Tetrapartite Synapse.

Anna Kruyer1, Vivian C Chioma1, Peter W Kalivas1

  • 1Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina.

Biological Psychiatry
|August 6, 2019
PubMed
Summary
This summary is machine-generated.

Opioid use causes lasting brain changes in reward circuits. Research shows these changes involve the tetrapartite synapse, offering new ways to combat addiction behaviors and relapse.

Keywords:
AstrogliaExtracellular matrixOpioidPlasticityPostsynapsePresynapse

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Area of Science:

  • Neuroscience
  • Addiction Research
  • Synaptic Plasticity

Background:

  • Opioid administration induces persistent alterations in brain reward and habit pathways.
  • Understanding these neuroadaptations is crucial for developing effective addiction treatments.

Purpose of the Study:

  • To detail opioid-induced modifications within the components of the tetrapartite synapse.
  • To provide a neurobiological framework for how these synaptic adaptations contribute to addiction-related behaviors.
  • To identify potential therapeutic targets for restoring synaptic homeostasis and reducing relapse vulnerability.

Main Methods:

  • Analysis of opioid-induced changes in preclinical models.
  • Examination of synaptic plasticity at presynaptic and postsynaptic elements.
  • Investigation of the role of astroglial processes and the extracellular matrix in opioid addiction.

Main Results:

  • Opioid-induced plasticity affects all components of the tetrapartite synapse: presynaptic terminals, postsynaptic neurons, astroglia, and the extracellular matrix.
  • These modifications converge to dysregulate glutamate signaling in the nucleus accumbens.
  • The study outlines a unified framework of opioid-induced glutamate dysregulation.

Conclusions:

  • Opioid addiction involves complex, long-lasting synaptic adaptations within the tetrapartite synapse.
  • Targeting these synaptic dysregulations, particularly glutamate signaling, may offer novel strategies to reduce craving and relapse.
  • Further research into restoring synaptic homeostasis is warranted for addiction treatment development.