COVID-19 and hyperammonemia: Potential interplay between liver and brain dysfunctions

Area of Science:

• Neuroscience
• Hepatology
• Infectious Diseases

Background:

• COVID-19 primarily targets the respiratory system but causes extrapulmonary issues.
• Encephalopathy and liver damage are recognized COVID-19 complications.
• The interplay between liver and brain dysfunction in COVID-19 requires further investigation.

Purpose of the Study:

• To explore the potential link between liver dysfunction and brain abnormalities in COVID-19.
• To investigate the role of ammonia in mediating COVID-19-related neurological effects.
• To highlight the impact of astrocyte dysfunction on neurological outcomes.

Main Methods:

• Literature review and analysis of existing COVID-19 case studies.
• Biochemical pathway analysis focusing on ammonia metabolism.
• Pathophysiological modeling of astrocyte-neuron interactions.

Main Results:

• Evidence suggests ammonia accumulation may contribute to encephalopathy in COVID-19 patients.
• Astrocyte dysfunction, potentially induced by hyperammonemia, is implicated.
• Impaired astrocyte function could underlie both acute and chronic neurological sequelae.

Conclusions:

• Ammonia is a potential mediator connecting COVID-19-induced liver damage to neurological complications.
• Astrocyte dysfunction represents a critical cellular event in the pathophysiology of COVID-19 neurological manifestations.
• Targeting ammonia levels and supporting astrocyte function may be crucial for managing neurological outcomes in COVID-19.