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Hemagglutinin variants of reovirus type 3 have altered central nervous system tropism
Abstract:
Variants of the Dearing strain of reovirus type 3 with antigenically altered hemagglutinin proteins are much less neurovirulent than the parental virus. When injected intracerebrally into mice these variants infected a subset of the brain neurons that were infected by the parental virus. When injected intraperitoneally, the variants did not spread to the brain. These results indicate that minor modifications of the reovirus hemagglutinin dramatically alter the ability of the virus to spread into and injure the central nervous system.
Insights
Altered hemagglutinin proteins in reovirus type 3 significantly reduce neurovirulence. These modified reoviruses show limited central nervous system spread and infection in mice, highlighting hemagglutinin
Area of Science:
- Virology
- Neuroscience
- Molecular Biology
Background:
- Reovirus type 3 (T3) is a known neurotropic virus.
- The hemagglutinin (HA) protein is a key viral surface protein involved in host cell attachment and entry.
- Understanding viral determinants of neurovirulence is crucial for developing safe viral vectors and therapeutics.
Purpose of the Study:
- To investigate the role of reovirus type 3 hemagglutinin protein in neurovirulence.
- To determine how alterations in hemagglutinin affect viral spread and central nervous system (CNS) infection.
- To assess the impact of HA modifications on neuronal tropism.
Main Methods:
- Generation of reovirus type 3 variants with antigenically altered hemagglutinin proteins.
- Intracerebral and intraperitoneal inoculation of mice with parental and variant viruses.
- Analysis of viral spread within the CNS and neuronal infection patterns.
Main Results:
- Reovirus variants with altered HA proteins exhibited significantly reduced neurovirulence compared to the parental Dearing strain.
- Intracerebral injection of variants resulted in infection of a subset of neurons targeted by the parental virus.
- Intraperitoneal administration of variants prevented viral spread to the brain.
Conclusions:
- Minor modifications to the reovirus hemagglutinin protein dramatically alter viral neurovirulence.
- The HA protein is a critical determinant for reovirus spread into and injury of the CNS.
- Targeted modifications of viral surface proteins can modulate neuroinvasive potential.