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Novel extracellular matrix architecture on excitatory neurons revealed by HaloTag-HAPLN1

Sterin, I.; Niazi, A.; Kim, J.; Park, J.; Park, S.

2024-03-30 neuroscience
10.1101/2024.03.29.587384 bioRxiv
Show abstract

The brains extracellular matrix (ECM) regulates neuronal plasticity and animal behavior. ECM staining shows an aggregated pattern in a net-like structure around a subset of neurons and diffuse staining in the interstitial matrix. However, understanding the structural features of ECM deposition across various neuronal types and subcellular compartments remains limited. To visualize the organization pattern and assembly process of the hyaluronan-scaffolded ECM in the brain, we fused a HaloTag to HAPLN1, which links hyaluronan and proteoglycans. Expression or application of the probe enables us to identify spatial and temporal regulation of ECM deposition and heterogeneity in ECM aggregation among neuronal populations. Dual-color birthdating shows the ECM assembly process in culture and in vivo. Sparse expression in vivo reveals novel forms of ECM architecture around excitatory neurons and developmentally regulated dendritic ECM. Overall, our study uncovers extensive structural features of the brain ECM, suggesting diverse roles in regulating neuronal plasticity.

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