The brain's extracellular matrix and its role in synaptic plasticity

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• The brain's extracellular matrix (ECM) is crucial for synaptic function and plasticity.
• A juvenile ECM supports neuronal network wiring, synaptogenesis, and maturation.
• Mature ECM, characterized by perineuronal nets (PNNs), marks the closure of critical periods for circuit development.

Purpose of the Study:

• To explore recent findings on the functions of the ECM in brain plasticity.
• To highlight the ECM's role as a diffusion barrier and regulator of cell surface molecules.
• To examine the ECM's active regulation of synaptic plasticity, homeostasis, and signaling pathways.

Main Methods:

• Review of recently reported aspects of ECM functions in brain plasticity.
• Focus on discoveries regarding ECM's role as a diffusion barrier.
• Analysis of ECM components' functions in synaptic plasticity and homeostasis.
• Investigation of ECM shaping by extracellular proteases and subsequent signaling pathway activation.

Main Results:

• The ECM acts as a passive diffusion barrier, compartmentalizing cell surfaces and affecting molecules like neurotransmitter receptors.
• Specific ECM components actively regulate synaptic plasticity and maintain homeostasis.
• Extracellular proteases shape the ECM, influencing the activation of particular signaling pathways.

Conclusions:

• The brain's ECM is a dynamic regulator of neuronal function and plasticity.
• ECM's structural and functional roles extend beyond development into adult neural circuit maintenance.
• Understanding ECM dynamics offers insights into therapeutic strategies for neurological disorders.