Brain extracellular matrix retains connectivity in neuronal networks

Area of Science:

• Neuroscience
• Cellular Biology

Background:

• The brain extracellular matrix (ECM) is crucial for neuronal network function and development.
• ECM removal can enhance central nervous system (CNS) plasticity and recovery, but mechanisms are unclear.

Purpose of the Study:

• Investigate the ECM's role in regulating neuronal network activity.
• Explore how ECM affects network connectivity and plasticity in mature hippocampal cultures.

Main Methods:

• Utilized dissociated hippocampal cultures grown on microelectrode arrays (MEAs).
• Enzymatically removed the ECM in mature cultures and induced disinhibition.
• Analyzed changes in neuronal activity and network interactions.

Main Results:

• ECM removal transiently enhanced neuronal activity but prevented disinhibition-induced hyperexcitability.
• ECM degradation followed by disinhibition shifted network interactions towards a juvenile pattern.
• ECM appears to retain existing connectivity via synaptic glutamate confinement.

Conclusions:

• The ECM plays a key role in maintaining established neuronal connectivity in mature networks.
• ECM removal facilitates network modification and exploration of new network architectures.