Coxsackievirus B4 infection and interneuronal spread in primary cultured neurons
2020
Abstract Coxsackie B viruses (CV–B) are usually transmitted via the fecal-oral route and the virus gains the central nervous system (CNS) via the bloodstream. Nevertheless, other routes of spread of the virus to the CNS cannot be excluded, including the neuronal route. Neuronal cells, as well as non-neuronal cells (fibroblasts), were isolated from mice and inoculated with CV-B4 in the absence and presence of neutralizing serum. In the absence of neutralizing serum, virus titers recorded in neuron cultures and rates of infected neurons were non-significantly different compared to those recorded in fibroblast cultures. Higher cell mortality was noted among neurons than fibroblasts. The addition of neutralizing serum to neurons did not reduce significantly virus titers or rates of infected cells and cell viability was not significantly augmented, while virus titers and rates of infected fibroblasts were significantly reduced and their viability was significantly enhanced as well. Our results demonstrate the ineffectiveness of neutralizing serum to prevent neurons infection with CV-B4 which suggests a trans-synaptic transmission of CV-B4 between neurons.
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