Astrocytes in Multiple Sclerosis: Getting to the Core

Area of Science:

• Neuroimmunology
• Central Nervous System (CNS) Disorders
• Astrocyte Biology

Background:

• Astrocytes are crucial in multiple sclerosis (MS) pathogenesis, affecting neuroinflammation, blood-brain barrier integrity, and tissue repair.
• Astrocyte heterogeneity is evident in MS, with cells exhibiting either detrimental or beneficial functions based on their microenvironment.

Purpose of the Study:

• To review the multifaceted roles of astrocytes in MS.
• To highlight signaling pathways regulating astrocyte responses in chronic neuroinflammation.
• To explore the active involvement of astrocytes in lesion dynamics and CNS homeostasis.

Main Methods:

• Literature review focusing on astrocyte roles in multiple sclerosis.
• Analysis of signaling pathways governing astrocyte responses.
• Examination of astrocyte functions in chronic active lesion cores.

Main Results:

• Astrocytes actively influence neuroinflammation, BBB integrity, leukocyte infiltration, glial scarring, and repair processes in MS.
• Astrocyte heterogeneity leads to varied pathogenic or neuroprotective roles depending on the local milieu.
• Astrocytes in chronic active MS lesions are involved in immune regulation, survival signaling, and tissue maintenance.

Conclusions:

• Astrocytes are dynamic regulators of lesion evolution and CNS homeostasis in MS.
• Recognizing astrocyte heterogeneity and signaling networks is key to developing novel MS therapies.
• Targeting astrocyte functions may limit neurodegeneration and disease progression in multiple sclerosis.