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Fractalkine/CX3CR1-Dependent Modulation of Synaptic and Network Plasticity in Health and Disease

N P Camacho-Hernández1, F Peña-Ortega1

  • 1Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, UNAM-Campus Juriquilla, Mexico.

Neural Plasticity
|January 16, 2023
PubMed

Insights

The fractalkine (FKN)/CX3CR1 axis is crucial for brain function, regulating neuron-microglia communication and synaptic plasticity. Disruptions impact brain circuits and function in health and disease.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Immunology

Background:

  • CX3CR1 is a G protein-coupled receptor found exclusively on microglia in the brain.
  • Fractalkine (FKN) is the sole known ligand for CX3CR1, expressed by neurons.
  • The FKN/CX3CR1 axis is vital for microglia-neuron communication.

Purpose of the Study:

  • To review the modulation of synaptic plasticity by the FKN/CX3CR1 axis.
  • To explore the impact of this axis on brain function and adaptation.
  • To discuss the role of FKN/CX3CR1 in health and disease.

Main Methods:

  • Literature review of studies on FKN/CX3CR1 axis and synaptic plasticity.
  • Analysis of the mechanisms regulating microglial state, neuronal survival, and synaptic functions.
  • Examination of the consequences of CX3CR1 absence or FKN/CX3CR1 axis failure.

Main Results:

  • The FKN/CX3CR1 axis regulates microglial state, neuronal survival, and synaptic plasticity.
  • Dysfunction in this axis leads to altered synaptic and network plasticity in various brain regions.
  • Impacts are observed in the hippocampus, cortex, brainstem, and spinal cord.

Conclusions:

  • Synaptic plasticity is fundamentally modulated by the FKN/CX3CR1 axis.
  • This axis plays a critical role in neural circuit integration and adaptation.
  • Understanding FKN/CX3CR1 is key to comprehending brain function and disease.

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