The Innate Immune Receptor CD14 Mediates Lymphocyte Migration in EAE

Area of Science:

• Neuroimmunology
• Innate Immunity
• Autoimmune Diseases

Background:

• Multiple sclerosis (MS) is a common autoimmune CNS disorder in young adults.
• While T cells are implicated, the innate immune system's role in MS is increasingly recognized.
• Previous work identified a key role for the CD14 receptor in experimental autoimmune encephalomyelitis (EAE).

Purpose of the Study:

• To investigate the mechanisms behind CD14-deficiency-induced EAE aggravation.
• To examine T cell activation, costimulatory molecule expression (CTLA-4, CD28), and migration.
• To assess lymphocyte transmigration across the blood-brain barrier.

Main Methods:

• FACS analysis of T cell activation and costimulatory molecules.
• In vitro adhesion assays of lymphocytes to endothelial cells.
• In vitro transmigration assays across endothelial monolayers.

Main Results:

• CD14-deficient lymphocytes showed significantly increased migration across endothelial monolayers.
• No differences were observed in T cell receptor (TCR)/CTLA-4 or TCR/CD28 expression.
• Lymphocyte adhesion to endothelial cells was similar between CD14-deficient and wildtype mice.

Conclusions:

• CD14 plays a crucial role in regulating lymphocyte migration.
• These findings underscore the significance of innate immune receptors in adaptive immune disorders like MS.
• Targeting CD14 may offer therapeutic potential for MS and related conditions.