๐ Fusion resistance and decreased infectability as major host cell determinants of coronavirus persistence
Mouse hepatitis virus persists in cultures of a subline (designated LM-K) of mouse LM cells but produces a lytic infection in L-2 cells. Persistence in the LM-K cells was not accompanied by production of is mutants or of soluble anti-MHV factors. Infectious center assay demonstrated an approximately 500-fold lower level of infectibility by MHV of the LM-K cells as compared to L-2 cells. On an infected cell basis, production levels of infectious progeny and viral RNA were comparable between the two cell lines. The extent of virus-induced cell-cell fusion, however, was markedly reduced in the LM-K cells. Cell-mixing experiments showed that both infected L-2 and LM-K cells have the capacity of fusing with neighboring uninfected L-2 cells but not with uninfected LM-K cells. This suggests that the decreased level of fusion observed in the LM-K infection is due not to absence of viral fusion protein at the cell surface, but rather to an inherent resistance of the LM-K cell membrane to MHV-induced fusion. It is believed that such fusion resistance in LM-K cells moderates virus dissemination throughout the culture, thereby contributing to a state of virus persistence. ยฉ 1983.
keywords
๐ cell-cell fusion (34)
๐ hepatitis virus (437)
๐ cell lines (125)
๐ cell surface (110)
๐ cell line (211)
๐ viral fusion (38)
year
โฐ 1983
journal
๐ Virology
issn
๐ 10960341 00426822
volume
128
number
2
page
407-417
citedbycount
21
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