Acute Cerebellar Inflammation and Related Ataxia: Mechanisms and Pathophysiology

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• The cerebellum is crucial for motor control and learning.
• Infections trigger cerebellar inflammation, often leading to ataxia.
• Current models show a gap in understanding early inflammation's link to ataxia.

Purpose of the Study:

• To bridge the interpretative gap between early cerebellar inflammation and ataxia.
• To review infection-induced cerebellar inflammation, aberrant immunity, and glial responses.
• To propose mechanisms and treatments for cerebellar ataxia in inflammation.

Main Methods:

• Review of existing literature on cerebellar inflammation and ataxia.
• Focus on viral infections (CMV, influenza, dengue, SARS-CoV-2) and autoimmunity.
• Analysis of neurophysiological modulation by inflammatory mediators.
• Discussion of cerebellar circuit dysfunction and homeostatic properties.

Main Results:

• Acute cerebellar inflammation in models shows hyperexcitability, not ataxia.
• Neurodegeneration models with hypoexcitability exhibit ataxia.
• Ca2+-activated K+ channel suppression is linked to ataxia.

Conclusions:

• Infection-induced cerebellar inflammation presents a complex pathway to ataxia.
• Aberrant immunity and glial responses play key roles.
• Understanding neurophysiological and circuit-level changes is vital for developing treatments.