Proteoglycans and neuronal migration in the cerebral cortex during development and disease

Area of Science:

• Neuroscience
• Molecular Biology
• Developmental Biology

Background:

• Proteoglycans, including chondroitin sulfate proteoglycans (CSPGs) and heparan sulfate proteoglycans (HSPGs), are key components of the brain's extracellular matrix and cell surface.
• They interact with numerous proteins, such as growth factors and axon guidance molecules, influencing cellular functions through their glycosaminoglycan (GAG) and core protein structures.

Purpose of the Study:

• To explore the role of proteoglycans in neuronal migration and their potential involvement in psychiatric and intellectual disorders.
• To highlight the functional significance of structural GAG variability and the roles of specific proteoglycans in brain development.

Main Methods:

• Review of existing literature on proteoglycan structure, function, and expression in the developing brain.
• Analysis of studies linking proteoglycan-related genes to neurological and psychiatric conditions.

Main Results:

• Neuronal cell surface proteoglycans (e.g., PTPζ, neuroglycan C, syndecan-3) act as receptors for heparin-binding growth factors, mediating neuronal migration.
• Secreted CSPGs (e.g., neurocan, versican, phosphacan) aggregate with other matrix molecules and are highly expressed in critical areas for neuronal migration in the developing cerebrum.
• These CSPGs may serve as anchors for guidance cues that direct the migration of inhibitory neurons.

Conclusions:

• Proteoglycans play a crucial role in regulating neuronal migration through diverse molecular interactions.
• Dysregulation of proteoglycan synthesis or function, indicated by genetic associations with disorders, may underlie defects in neuronal migration and contribute to psychiatric and intellectual disabilities.