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Published on: July 24, 2016
Hepatitis C virus infection and the brain
Karin Weissenborn1, Anita B Tryc, Meike Heeren
1Department of Neurology, Hannover Medical School, 30623 Hannover, Germany. Weissenborn.Karin@mh-hannover.de
Metabolic Brain Disease
|January 9, 2009
Summary
Hepatitis C virus (HCV) infection impacts the brain, causing fatigue and cognitive issues like attention deficits. The Trojan horse hypothesis suggests infected blood cells carry the virus into the brain, affecting neurological function.
Area of Science:
- Neuroscience
- Virology
- Hepatology
Background:
- Hepatitis C virus (HCV) infection is increasingly linked to neurological complications.
- Many HCV patients experience persistent fatigue, cognitive deficits (attention, memory), and depression, even after treatment.
- These symptoms occur irrespective of liver disease severity or viral load.
Purpose of the Study:
- To investigate the neurological effects of Hepatitis C virus (HCV) infection.
- To explore the mechanisms by which HCV may affect the brain.
- To understand the persistence of neurological symptoms post-treatment.
Main Methods:
- Psychometric testing to assess cognitive functions like attention and verbal learning.
- Magnetic resonance spectroscopy to analyze brain metabolite concentrations (choline, N-acetyl-aspartate, creatine).
- Cerebral glucose utilization and neurotransmitter transporter binding studies (serotonin, dopamine).
- Detection of HCV in brain tissue and cerebrospinal fluid.
Main Results:
- HCV-infected patients show characteristic deficits in attention and verbal learning.
- Alterations in brain metabolites (choline, N-acetyl-aspartate, creatine) were observed in specific brain regions.
- Reduced cerebral glucose utilization and altered neurotransmitter transporter binding suggest dopaminergic system involvement.
- HCV RNA detected in brain samples, with distinct sequences from liver isolates, supporting viral presence.
Conclusions:
- HCV infection demonstrably affects the brain, leading to cognitive impairment and neurological changes.
- The Trojan horse hypothesis is supported, proposing HCV-infected mononuclear cells transport the virus into the brain.
- HCV may infect brain cells, particularly astrocytes, contributing to neurological symptoms and persistence.
- Further research is needed to elucidate the full impact of HCV on the central nervous system.
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