This review explores the structure, distribution, and functional roles of Collagen VI (Col VI), a significant extracellular matrix (ECM) protein, in both the central (CNS) and peripheral nervous systems (PNS), along with its connections to neurological diseases. Traditionally recognized for supporting muscle integrity, Col VI also plays crucial roles in nervous tissue architecture and cellular signaling.

Key Points

• Molecular and Structural Roles

  Col VI is a network-forming collagen within the ECM that interacts with various ECM proteins and cell-surface receptors. It modulates biomechanical properties and intracellular signaling pathways important for cell survival, differentiation, apoptosis, autophagy, and immune responses.

• Peripheral Nervous System (PNS) Functions

  In the PNS, Col VI regulates Schwann cell differentiation, supports myelination, maintains nerve structure and function, and aids in nerve regeneration after injury. This highlights its essential structural and regulatory roles in peripheral nerve physiology.

• Central Nervous System (CNS) Roles

  Though Col VI’s role in the CNS is less defined than in the PNS, it is expressed in brain ECM and associated structures, participates in neuronal and glial ECM interactions, and may affect neuronal survival and responses to injury or stress. Evidence suggests:

  • Col VI may have neuroprotective effects, such as protection against amyloid-beta (Aβ)-induced neurotoxicity in experimental models.
  • Its regulated deposition and turnover are likely crucial for neuronal homeostasis. An imbalance in ECM composition could contribute to neurodegenerative pathology or impaired repair mechanisms.

• Disease Associations

  Genetic deficiencies or dysregulation of Col VI components are linked to connective tissue and neuromuscular disorders. Emerging evidence also suggests Col VI alterations in neurodegenerative processes and ECM remodeling in CNS disease.

Translational and Clinical Implications

• ECM and Neuropathology

  Col VI’s role in ECM structure and cell signaling highlights the importance of ECM integrity for neuronal survival, synaptic stability, and repair capacity. Disruption of ECM homeostasis, including Col VI alterations, may lead to neurodegenerative changes and impaired regeneration.

• Potential Therapeutic Angles

  Understanding Col VI’s regulation could inform strategies to preserve ECM support during nervous system injury or disease. This might enhance neuronal resilience, modulate inflammation, or support regenerative outcomes.

Bottom Line:
Collagen VI is a dynamic ECM component with crucial structural and regulatory roles in both peripheral and central nervous systems. Its functions extend beyond mechanical support to active participation in cellular signaling, nerve integrity, and potentially neuroprotection. Dysregulation of Col VI contributes to nervous system pathology and represents a potential target for therapeutic intervention.