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. 1991 Mar;65(3):1286–1290. doi: 10.1128/jvi.65.3.1286-1290.1991

Selection of an attenuated Coxsackievirus B3 variant, using a monoclonal antibody reactive to myocyte antigen.

N Van Houten 1, P E Bouchard 1, A Moraska 1, S A Huber 1
PMCID: PMC239903  PMID: 1847455

Abstract

Previously, we described a heart-reactive monoclonal antibody (MAb), 10A1, derived from a coxsackievirus B3 (CVB3)-infected mouse. This MAb selectively inhibits infection of HeLa cells and myocytes with the myocarditic virus variant (CVB3W). A plaque-purified variant (H3) of CVB3W was isolated from the heart of an infected animal, and a second virus (H3-10A1) was obtained by growing H3 in HeLa cells in the presence of MAb 10A1. As with the parental CVB3W virus, H3 infection of HeLa cells can be inhibited by MAb 10A1, but the antibody-selected H3-10A1 variant is resistant to MAb inhibition (presumably an escape mutant). BALB/c mice infected with 10(6) PFU of CVB3W, H3, or H3-10A1 resulted in approximately 90% animal mortality with CVB3W or H3 and less than 10% mortality with H3-10A1, suggesting that the escape mutant is less pathogenic. Additionally, hearts from animals infected with H3-10A1 demonstrated only half the amount of myocarditis observed in either CVB3W- or H3-infected mice. Cardiac virus titers were also reduced approximately 200-fold in H3-10A1-infected animals compared with those in mice given the pathogenic variants. In vitro studies indicate that H3-10A1 is less effective in inhibiting cellular RNA and protein synthesis and show reduced virus replication compared with that of pathogenic viruses in cultured myocytes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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