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Drug Abuse and Addiction: Pharmacological Phenomena

Drug Abuse and Addiction: Pharmacological Phenomena

Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not necessarily...

Neuroplasticity

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

Long-term Potentiation

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...

Long-term Potentiation

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.

Integration of Synaptic Events

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...

Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

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Related Experiment Video

Updated: Jul 10, 2026

Comprehensive Analysis of Transcription Dynamics from Brain Samples Following Behavioral Experience

Comprehensive Analysis of Transcription Dynamics from Brain Samples Following Behavioral Experience

Published on: August 26, 2014

Synaptic plasticity and addiction.

Julie A Kauer¹, Robert C Malenka

¹Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, Rhode Island 02912, USA.

Nature Reviews. Neuroscience

|October 20, 2007

Summary

Drug addiction involves strong memories that can trigger relapse. Evidence shows drugs alter brain plasticity, particularly in the dopamine system, offering potential treatment targets.

Area of Science:

Neuroscience
Addiction Research
Molecular Psychiatry

Background:

Addiction is characterized by persistent drug use and relapse, often triggered by environmental cues.
Drug-associated memories are powerful and contribute significantly to the chronicity of addiction.
Relapse remains a significant clinical challenge in treating substance use disorders.

Purpose of the Study:

To explore the neurobiological mechanisms underlying drug-induced memory formation in addiction.
To investigate the role of synaptic plasticity in the mesolimbic dopamine system in addiction.
To identify potential therapeutic strategies for addiction by targeting drug-induced synaptic modifications.

Main Methods:

Review and synthesis of accumulated evidence on synaptic plasticity in addiction.

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Last Updated: Jul 10, 2026

Comprehensive Analysis of Transcription Dynamics from Brain Samples Following Behavioral Experience

Comprehensive Analysis of Transcription Dynamics from Brain Samples Following Behavioral Experience

Published on: August 26, 2014

Using Optogenetics to Reverse Neuroplasticity and Inhibit Cocaine Seeking in Rats

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Published on: October 5, 2021

3D Modeling of Dendritic Spines with Synaptic Plasticity

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Focus on alterations within the mesolimbic dopamine system.

Analysis of drug-induced changes in neural circuits related to reward and memory.

Main Results:

Drugs of abuse hijack synaptic plasticity mechanisms in critical brain circuits.
The mesolimbic dopamine system, central to reward processing, is a key target of these drug-induced alterations.
These modifications contribute to the formation of long-lasting drug-associated memories.

Conclusions:

Understanding drug-induced synaptic plasticity is crucial for addiction research.
Targeting these neurobiological changes offers a promising avenue for novel addiction therapies.
Reversing or preventing synaptic modifications may help treat addiction and reduce relapse.