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Antivir Ther. 2011;16(7):999-1004. doi: 10.3851/IMP1838.

Immunological and pathogenic properties of poliovirus variants selected for resistance to antiviral drug V-073.

Author information

1
Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, MD, USA.

Abstract

BACKGROUND:

The National Research Council has recommended development of polio antiviral drugs to assist in management of outbreaks and to mitigate adverse consequences of vaccination. V-073 is a small molecule poliovirus capsid inhibitor that is being developed for these purposes. Antiviral use raises the potential of treatment-emergent resistance. Understanding virological consequences of resistance is important.

METHODS:

Six independent laboratory-derived V-073-resistant poliovirus variants were characterized for their ability to be neutralized by conventional vaccine-induced immune sera, to elicit serum neutralizing antibodies upon CD-1 mouse immunization, and to replicate in and to cause paralysis of TgPVR21 mice.

RESULTS:

V-073-resistant variants were effectively neutralized by oral poliovirus vaccine and inactivated poliovirus vaccine human immune sera. All variants elicited virus neutralizing antibody titres in CD-1 mice that were comparable to drug-susceptible parental and Sabin vaccine strain viruses. Infection efficiency of TgPVR21 mice by variants was comparable to (1 of 6 variants) or considerably lower than (5 of 6 variants) parental viruses. Drug-resistant variants replicated to levels comparable to (1 of 6 variants) or substantially less than (5 of 6 variants) their drug-susceptible parental viruses and were on average 1.4 log(10) (range 0.3 to >2.8 log₁₀) less neurovirulent.

CONCLUSIONS:

Laboratory-derived V-073-resistant variants exhibit clear attenuation of pathogenic properties while maintaining immunological features of drug-susceptible viruses.

PMID:
22024515
DOI:
10.3851/IMP1838
[Indexed for MEDLINE]

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