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Perineuronal Nets: Old Structures, New Functions.

Bhanu P Tewari1, Lata Chaunsali2, Harald Sontheimer2

  • 1Department of Biology, Texas A&M University, College Station, TX, USA.

The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry
|February 26, 2026
PubMed
Summary
This summary is machine-generated.

Perineuronal nets (PNNs) stabilize brain synapses. Disruptions in PNNs are linked to neurologic diseases like epilepsy and Alzheimer's, offering therapeutic targets.

Keywords:
Alzheimer diseaseCA2astrocytesepilepsyextracellular matrixperineuronal netplasticitysocial memory

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Extracellular Matrix Research

Background:

  • Perineuronal nets (PNNs) are extracellular matrix aggregates ensheathing neurons, crucial for synaptic stabilization during development.
  • Historically studied for developmental roles, PNNs are increasingly recognized for their dynamic remodeling and involvement in adult brain function and disease.

Purpose of the Study:

  • To review recent findings on PNN functions in the healthy brain.
  • To explore the causal association between PNN alterations and neurologic diseases, including epilepsy, glioma, and Alzheimer disease.
  • To detail novel PNN functions in regulating neuronal firing and synaptic clearance.

Main Methods:

  • Literature review of recent studies on PNNs.
  • Analysis of PNN roles in synaptic stabilization and neuronal excitability.
  • Examination of PNN involvement in neurologic disease pathogenesis.

Main Results:

  • PNNs regulate neuronal firing through altered membrane capacitance and electrostatic ion filtering.
  • PNNs assist in astrocytic clearance of glutamate and potassium at tripartite synapses.
  • PNN disruption is causally linked to epilepsy, glioma, and Alzheimer disease.

Conclusions:

  • PNNs play critical roles beyond development, influencing neuronal function and synaptic stability in the adult brain.
  • Alterations in PNN structure and function are implicated in major neurologic disorders.
  • Targeting PNNs presents a potential therapeutic strategy for modulating disease progression and presentation.