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Lymphocytic choriomeningitis virus injures the developing brain: effects and mechanisms.
Pediatric Research 2024 January 6
Lymphocytic choriomeningitis virus (LCMV) is a prevalent pathogen, whose natural host and reservoir is the wild mouse. Humans can be infected when they contact the secretions of mice. Most infections of postnatal humans result in mild illness. However, the consequences can be severe when the infection occurs during pregnancy, as the virus crosses the placenta to infect the fetus. LCMV infection of the human fetus can lead to severe neuropathologic effects, including microencephaly, hydrocephalus, focal destructive lesions, and cerebellar hypoplasia. Outcomes among children with congenital LCMV are variable, but most are permanently and severely disabled. The neonatal rat inoculated with LCMV models human prenatal infection. The rat model has demonstrated that effects of LCMV depend on host age at the time of infection. Some effects, including encephalomalacia and neuronal migration disturbances, are immune-mediated and depend on the actions of T-lymphocytes. Other effects, including cerebellar hypoplasia, are virus-mediated and do not depend on T-lymphocytes. Cerebellar neuronal migration disturbances are caused by immune-mediated corruption of Bergmann glia structure. The rat pup inoculated with LCMV is a superb animal model for human congenital infection. All neuropathologic effects observed in human congenital LCMV infection can be recapitulated in the rat model. IMPACT: Lymphocytic choriomeningitis virus (LCMV) is a prevalent human pathogen that can cause serious neurologic birth defects when the infection occurs during pregnancy. The effects of the virus on the developing brain depend strongly on the age of the host at the time of infection. Some of the pathologic effects of LCMV are immune-mediated and are driven by T-lymphocytes, while other pathologic effects are due to the virus itself.
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