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Related Concept Videos

Neuroplasticity01:01

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.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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The Synapse02:47

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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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
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Long-term Potentiation01:35

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Homeostatic synapse-driven membrane plasticity in nucleus accumbens neurons.

Masago Ishikawa1, Ping Mu, Jason T Moyer

  • 1Program in Neuroscience, Washington State University, Pullman, Washington 99164-6520, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 8, 2009
PubMed
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Researchers discovered homeostatic synapse-driven membrane plasticity (hSMP) in nucleus accumbens neurons. This novel mechanism adjusts neuronal excitability but is disrupted by cocaine withdrawal, potentially contributing to addiction-related brain changes.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Neuropharmacology

Background:

  • Stable brain function depends on maintaining neuronal output through homeostatic regulation.
  • Neurons convert synaptic input into output via action potential firing.
  • Understanding synapse-membrane interactions is key to identifying homeostatic mechanisms.

Purpose of the Study:

  • To identify novel homeostatic mechanisms balancing synaptic input and neuronal output.
  • To investigate synapse-to-membrane homeostatic regulation in nucleus accumbens (NAc) neurons.

Main Methods:

  • Focused on NAc neurons to study homeostatic synapse-driven membrane plasticity (hSMP).
  • Investigated the role of synaptic NMDA receptors (NMDARs) and SK-type Ca(2+)-activated potassium channels in hSMP.
  • Examined hSMP in rats undergoing short-term (2 days) and long-term (21 days) withdrawal from chronic cocaine exposure.

Main Results:

  • Demonstrated hSMP, a novel form of synapse-to-membrane homeostatic regulation in NAc neurons.
  • Showed that hSMP adjusts membrane excitability to compensate for shifts in excitatory synaptic input.
  • Found that hSMP is triggered by NMDARs and involves SK-channel modification.
  • Observed that hSMP was abolished in rats during both short- and long-term cocaine withdrawal.

Conclusions:

  • hSMP represents a new form of homeostatic plasticity linking synapses to membrane excitability.
  • Dysregulation of hSMP in NAc neurons may play a role in cellular adaptations associated with cocaine addiction.