Abstract
Chikungunya virus (CHIKV) infection, generally characterised by fever, rash and debilitating polyarthralgia, and/or arthritis, also causes complications of the central nervous system, including encephalitis. However, the role of microglial cells in the neuropathogenesis of CHIKV is poorly understood. The current study characterised the progression of CHIKV infection in the human microglial cell line CHME-3. The susceptibility of these cells to CHIKV and the viral replication kinetics were assessed during the early and late phases of infection. The cell viability was determined using the cell viability assay. Ultrastructural changes in CHIKV infected CHME-3 cells were assessed using transmission electron microscopy. The results showed that CHME-3 cells are susceptible to CHIKV infection and support viral replication with no significant loss in cell viability until 72 h post infection. Ultrastructural studies revealed the formation of cytopathic vacuoles-I (CPV-I) in the early stages and CPV-II in later stages with several virions organized along the membrane of CPV-II. Profuse vacuolation was observed in the later stages of infection. Abnormal giant mitochondria with altered cristae were observed in infected cells with an electron-dense matrix. The study establishes CHME-3 cells as a potential model for investigating the role of human microglial cells in neuropathogenicity of CHIKV.
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Acknowledgements
Authors acknowledge the support provided by technical staff of the Department of Neurovirology and Electron Microscopy Facility of the Department of Neuropathology, NIMHANS.
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The study was supported by core funds of the Department of Neurovirology, NIMHANS.
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Qadri, S.W., Kumar, N., Santhoshkumar, R. et al. Infection of human microglial cell line CHME-3 to study neuropathogenesis of chikungunya virus. J. Neurovirol. 28, 374–382 (2022). https://doi.org/10.1007/s13365-022-01070-7
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DOI: https://doi.org/10.1007/s13365-022-01070-7