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. 1979 Feb;23(2):486–495. doi: 10.1128/iai.23.2.486-495.1979

Assessment of Coxsackievirus B3 ts Mutants for Induction of Myocarditis in a Murine Model

Melvin D Trousdale 1,†, Ronald E Paque 1, Timothy Nealon 1, Charles J Gauntt 1
PMCID: PMC414191  PMID: 217832

Abstract

Ten temperature-sensitive (ts) mutants isolated from a myocarditis-inducing wild-type (WT) coxsackievirus B3 parent did not induce myocarditis in adolescent CD-1 mice. An avirulent prototype ts mutant from one of the three complementation groups adsorbed to murine cardiac tissue, as did WT virus. Heart tissues from mice inoculated with WT virus contained 100- to 1,000-fold more virus than heart tissues from mice inoculated with any of the three prototype ts mutants. WT virus exhibited a greater capsid stability and a higher efficiency of replication at 37°C than any of the three prototype ts mutants. All three prototype ts mutants induced less interferon in vivo than WT virus. Cell-mediated immune responses, assessed by the cell migration inhibition assay, were different in mice inoculated with WT virus when compared to ts 5 mutant virus. Peritoneal exudate cells from mice inoculated with WT but not ts 5 virus reacted specifically against antigens in WT virus HeLa cell lysates and antigens extracted with KCl from cardiac tissues of mice inoculated with WT virus. Cardiac tissues of mice inoculated with WT but not ts 5 virus contained KCl-extractable antigens which were able to specifically inhibit the migration of peritoneal exudate cells taken from mice immunized with WT virus. Therefore, ts 5 neither elicited a measurable cell-mediated immune response nor induced antigens in cardiac tissues which were immunoreactive with sensitized-(WT virus)-peritoneal exudate cells. Of 9 revertant viruses isolated from the 10 ts mutants, 5 showed covariance in ability to replicate at 39.5°C and capacity for induction of myocarditis. Some revertants exhibited a reduced capsid thermostability compared to WT virus but yet retained the capacity for induction of myocarditis. The data suggest that induction of myocarditis by coxsackievirus B3 variants depends on a combination of several variables, including capsid stability, capacity for replication at 37°C, and expression of the three identified genes. All three prototype ts mutants served as vaccine viruses in preventing myocarditis in adolescent mice subsequently challenged with WT virus. However, all three prototype ts mutants and their revertant variants retained partial to complete lethality in CD-1 neonates.

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Selected References

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