Neural cell adhesion refers to the complex process by which nerve cells and glial cells physically bind to each other and to the extracellular matrix, a process mediated by specialized cell adhesion molecules (CAMs). This precise physical interaction is fundamental for the proper formation, structural maintenance, and functional connectivity of the nervous system. Adhesion molecules play a crucial role in neurite outgrowth, synaptic formation, and the guidance of migrating neurons during development. Impaired adhesion contributes to neurological dysfunction and reduced synaptic plasticity.
Origin
This term originates from cellular and molecular neuroscience, where “adhesion” describes the sticking together of cells. The study of CAMs, such as N-CAM and cadherins, has elucidated the molecular mechanisms governing the intricate architecture of the brain. This concept is vital for understanding the physical scaffolding that supports all neural communication and structure.
Mechanism
The mechanism is governed by the expression and interaction of various classes of CAMs located on the cell surface. These molecules facilitate homophilic binding, where identical molecules on adjacent cells bind, or heterophilic binding, where different molecules interact. This binding transmits signals into the cell, influencing the cytoskeleton and activating intracellular signaling pathways that regulate cell shape, migration, and the stability of synaptic connections. The integrity of these adhesive forces is directly linked to the stability of neural networks.
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