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Long-term elevation of complement factors in cerebrospinal fluid of patients with Borna disease virus 1 (BoDV-1) encephalitis.
Journal of Infectious Diseases 2024 April 10
BACKGROUND: Borna disease virus 1 (BoDV-1) causes rare but severe zoonotic infections in humans, presenting as severe encephalitis. The case-fatality risk is very high and no effective countermeasures have been established so far. An immunopathology is presumed, while data on immune responses in humans are limited. Evidence of a role of the complement system in various neurological disorders and central nervous viral infections is increasing and specific inhibitors are available as therapeutic options.
METHODS: In this study, we investigated factors of the complement system in the cerebrospinal fluid (CSF) of patients with BoDV-1 infections (n = 17) in comparison to non-inflammatory control CSF samples (n = 11), using a bead-based multiplex assay. In addition, immunohistochemistry was performed using post-mortem brain tissue samples.
RESULTS: We found an intrathecal elevation of complement factors of all complement pathways and an active cascade during human BoDV-1 infections. The increase of certain complement factors such as C1q was persistent and C3 complement deposits were detected in post-mortem brain sections. Intrathecal complement levels were negatively correlated with survival.
CONCLUSION: Further investigations are warranted to clarify, whether targeting the complement cascade by specific inhibitors might be beneficial for patients suffering from severe BoDV-1 encephalitis.
METHODS: In this study, we investigated factors of the complement system in the cerebrospinal fluid (CSF) of patients with BoDV-1 infections (n = 17) in comparison to non-inflammatory control CSF samples (n = 11), using a bead-based multiplex assay. In addition, immunohistochemistry was performed using post-mortem brain tissue samples.
RESULTS: We found an intrathecal elevation of complement factors of all complement pathways and an active cascade during human BoDV-1 infections. The increase of certain complement factors such as C1q was persistent and C3 complement deposits were detected in post-mortem brain sections. Intrathecal complement levels were negatively correlated with survival.
CONCLUSION: Further investigations are warranted to clarify, whether targeting the complement cascade by specific inhibitors might be beneficial for patients suffering from severe BoDV-1 encephalitis.
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