CCRL2 regulates M1/M2 polarization during EAE recovery phase.

Area of Science:

• Neuroimmunology
• Inflammation Biology

Background:

• Atypical chemokine receptors regulate inflammation but lack chemotactic activity.
• Experimental autoimmune encephalitis (EAE) models the inflammatory aspects of multiple sclerosis (MS).

Purpose of the Study:

• To investigate the role of Chemokine (CC motif) receptor-like 2 (CCRL2) in EAE pathogenesis.
• To determine CCRL2's involvement in regulating central nervous system (CNS) inflammation during MS-like disease.

Main Methods:

• Utilized CCRL2-deficient mice in an EAE model.
• Assessed disease severity, inflammatory response, demyelination, and microglia/macrophage polarization.

Main Results:

• CCRL2-deficient mice exhibited exacerbated, nonresolving EAE.
• Increased demyelination and protracted inflammation were observed in CCRL2-deficient mice.
• Higher microglia/macrophage activation and M1/M2 imbalance were noted in deficient mice.

Conclusions:

• CCRL2 plays a critical role in downregulating CNS inflammation during the EAE recovery phase.
• CCRL2 is a key regulator of the inflammatory response relevant to multiple sclerosis.