White Matter Plasticity Keeps the Brain in Tune: Axons Conduct While Glia Wrap

Area of Science:

• Neuroscience
• Cellular Biology
• Neurobiology

Background:

• Precise neuronal input timing is essential for brain circuit function, development, and experience-dependent plasticity.
• Myelination is a key adaptation mechanism in vertebrate neural circuits, but its interaction with neuronal activity is not fully understood.
• White matter (WM) plasticity, the modulation of white matter by neural activity, has gained significant research interest.

Purpose of the Study:

• To summarize critical evidence for neuronal activity-dependent modulation of white matter.
• To discuss the implications of white matter plasticity for synaptic function and nervous system plasticity.
• To explore the underlying mechanisms of neuron-glia communication, focusing on glutamatergic signaling and the axomyelinic synapse.

Main Methods:

• Review of evidence from human diffusion tensor imaging (DTI) studies.
• Analysis of experimental findings from animal models investigating oligodendrocyte lineage and myelin sheath properties.
• Examination of studies on neuron-glia communication and potential critical periods for myelin plasticity.

Main Results:

• Evidence indicates activity-dependent changes in oligodendrocyte differentiation and proliferation.
• Neuronal activity modulates the properties of myelin sheaths.
• Myelin plasticity appears to be influenced by critical periods, suggesting developmental windows for its modulation.

Conclusions:

• White matter plasticity is a significant phenomenon modulated by neuronal activity.
• The interplay between neurons and myelinating glial cells is bidirectional and crucial for brain circuit formation and function.
• Understanding myelin plasticity offers insights into nervous system plasticity and informs future research directions.