The Endocytic Receptor DEC205 Is Expressed by Brain Endothelial Cells and Is Involved in Regulating the Blood-Brain...

Area of Science:

• Neuroimmunology
• Cell Biology
• Vascular Biology

Background:

• DEC205 (CD205) is a known surface receptor involved in antigen uptake by dendritic cells.
• Its expression and function in non-immune cells, particularly in the central nervous system (CNS), remain less understood.

Purpose of the Study:

• To investigate the tissue expression pattern of DEC205 in mice.
• To elucidate the function of DEC205 in central nervous system endothelial cells (ECs).

Main Methods:

• Re-examination of DEC205 tissue expression in mice.
• Utilizing the murine brain-derived EC line bEnd.3 for functional studies.
• Investigating the effect of anti-DEC205 antibodies on endothelial junctions and Claudin 5 localization.

Main Results:

• DEC205 is expressed by endothelial cells in the murine central nervous system.
• In brain ECs, DEC205 functions as an endocytic receptor, directing ligands to lysosomal compartments.
• Engagement of DEC205 by antibodies leads to Claudin 5 internalization, opening endothelial junctions and facilitating leukocyte migration.

Conclusions:

• DEC205 expressed by CNS endothelial cells plays a role in regulating blood-brain barrier permeability.
• DEC205-mediated regulation of endothelial junctions may influence inflammatory processes within the central nervous system.