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Related Concept Videos

Neuroplasticity01:01

Neuroplasticity

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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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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.
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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Slice Patch Clamp Technique for Analyzing Learning-Induced Plasticity
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PV - Oligodendrocyte Interactions in the Infralimbic Cortex Promote Extracellular Plasticity after Safety Learning.

L E Denholtz1,2, J Liu2,3, I Nahmoud4

  • 1Biology Department, Hunter College, CUNY.

Biorxiv : the Preprint Server for Biology
|August 6, 2025
PubMed
Summary

Safety learning enhances cognitive flexibility by recruiting oligodendrocyte progenitor cells to parvalbumin interneurons in the brain's infralimbic region. This process involves oligodendrocyte maturation and perineuronal net degradation, shaping long-term brain activity.

Keywords:
cortexinfralimbicmaturation stageoligodendrocytesparvalbumin cellsperineuronal netsplasticitysafety learningsatellite cells

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Cognitive Science

Background:

  • The infralimbic region (IL) of the medial prefrontal cortex is crucial for safety learning.
  • The precise cellular mechanisms underlying IL-mediated safety learning remain largely unknown.

Purpose of the Study:

  • To elucidate the cellular mechanisms of safety learning within the IL.
  • To investigate the role of neuroglial plasticity in long-term cognitive flexibility.

Main Methods:

  • Single-cell RNA transcriptomic data mining to analyze oligodendrocyte gene expression.
  • In vivo experiments involving inhibition of IL parvalbumin (PV) interneurons during safety learning.

Main Results:

  • Safety learning promotes the recruitment and maturation of oligodendrocyte progenitor cells (OLs) into oligodendrocytes (OLs) at PV interneurons in the IL.
  • A decrease in perineuronal nets (PNNs) surrounding PV interneurons is observed, correlated with satellite OLs.
  • Immature OLs express PNN assembly genes, while mature OLs express PNN degradation enzymes.
  • Inhibiting IL PVs during safety learning blocks cognitive flexibility, OL maturation, and PNN degradation.

Conclusions:

  • Safety learning induces a novel form of neuroglial plasticity involving OLs.
  • This plasticity facilitates PNN degradation around PV interneurons, modulating IL activity and long-term cognitive flexibility.