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Hydrocephalus in suckling rats infected intracerebrally with mouse hepatitis virus, MHV-A59
Abstract:
After intracerebral inoculation of mouse hepatitis virus, MHV-A59 strain, into 3- to 5-day-old Wistar rats, some survivors at 14 days postinoculation (p.i.) were found to lack the cerebral cortex and to have an accumulation of considerable amount of cerebrospinal fluid. The virus titer in the brain increased exponentially after inoculation, reaching a maximum 4 to 6 days p.i. when immunofluorescence revealed virus-specific antigen within neurons in the cerebral cortex. A small amount of infectious virus was also detectable 14 days p.i. when the cerebral anomaly was evident. This brain malformation causing hydrocephalus was due to cerebral damage by viral infection.
Insights
Mouse hepatitis virus (MHV-A59) infection in young rats caused severe brain damage, leading to cerebral cortex loss and hydrocephalus. This viral encephalitis highlights the neurotoxic effects of MHV-A59 in early development.
Area of Science:
- Neuroscience
- Virology
- Developmental Biology
Background:
- Mouse hepatitis virus (MHV-A59) is a known pathogen.
- Early-life viral infections can cause significant neurological damage.
Purpose of the Study:
- To investigate the neuropathological effects of MHV-A59 infection in neonatal Wistar rats.
- To determine the correlation between viral load and the development of brain malformations.
Main Methods:
- Intracerebral inoculation of MHV-A59 into 3- to 5-day-old Wistar rats.
- Monitoring of survivors at 14 days postinoculation.
- Quantification of virus titer in the brain.
- Immunofluorescence staining for viral antigens in neurons.
Main Results:
- Survivors exhibited cerebral cortex absence and hydrocephalus at 14 days postinoculation.
- Brain virus titers peaked at 4 to 6 days postinoculation.
- Viral antigens were detected in cerebral cortex neurons during peak infection.
- Infectious virus was still present at 14 days postinoculation when malformations were evident.
Conclusions:
- Intracerebral MHV-A59 infection causes significant brain malformations, including hydrocephalus.
- The observed hydrocephalus results from direct viral damage to the developing brain.
- MHV-A59 infection in early life poses a risk for severe neurological sequelae.