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[Neurovirulence of influenza virus in mice]
1Department of Virology, Medical School, Nagoya City University.
Abstract:
Neurovirulence in mice is a unique property of some influenza virus strains including NWS and WSN strains. We performed clinical and immunohistochemical studies on mice after intracerebral inoculation with the neurovirulent WSN. On day 3 after inoculation, WSN antigen was detected in meningel and ependymal areas, neurons of circumventricular regions, the cerebral cortices, the substantia nigria zona compacta and the vental tegmental area. On day 7, advanced accumulation of the viral antigen was evident in the substantia nigra zona compacta and hippocampus. Double immunostaining demonstrated that the WSN antigen was only seen in neurons and not in microglia or reactive astrocytes. The responsible genes for neuro virulence were summarized.
Insights
Neurovirulent influenza strains, like WSN, target specific brain regions in mice. Viral antigens are found in neurons, not glial cells, highlighting the cellular tropism of influenza neuroinvasion.
Area of Science:
- Virology
- Neuroscience
- Immunology
Context:
- Neurovirulence is a rare but significant property of certain influenza virus strains.
- Understanding the mechanisms of influenza neuroinvasion is crucial for public health.
- Previous studies have identified influenza strains with neurotropic potential, such as NWS and WSN.
Purpose:
- To investigate the clinical and immunohistochemical features of WSN influenza virus infection in the mouse brain.
- To identify the specific brain regions and cell types affected by neurovirulent WSN influenza.
- To elucidate the cellular tropism of WSN influenza virus within the central nervous system.
Summary:
- Intracerebral inoculation of neurovirulent WSN influenza virus in mice led to widespread viral antigen detection.
- WSN antigen was observed in meningeal and ependymal areas, circumventricular regions, cerebral cortices, substantia nigra, and ventral tegmental area by day 3 post-inoculation.
- By day 7, viral antigen accumulated in the substantia nigra and hippocampus, with double immunostaining confirming neuronal tropism and excluding microglia and astrocytes.
Impact:
- This study clarifies the specific neuronal targets of neurovirulent influenza strains in the brain.
- Findings contribute to understanding the pathogenesis of influenza-associated neurological complications.
- Identifies key brain regions and cellular mechanisms involved in influenza neuroinvasion, informing future therapeutic strategies.