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Nature. 2014 Apr 17;508(7496):402-5. doi: 10.1038/nature13027. Epub 2014 Mar 2.

Protection against filovirus diseases by a novel broad-spectrum nucleoside analogue BCX4430.

Author information

1
Division of Molecular and Translational Sciences, Therapeutic Discovery Center, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), Fort Detrick, Maryland 21702, USA.
2
BioCryst Pharmaceuticals Inc., Durham, North Carolina 27703, USA.
3
1] BioCryst Pharmaceuticals Inc., Durham, North Carolina 27703, USA [2] Wilco Consulting, LLC, Durham, North Carolina 27712, USA.
4
MedExpert Consulting, Inc., Indialantic, Florida 32903, USA.

Abstract

Filoviruses are emerging pathogens and causative agents of viral haemorrhagic fever. Case fatality rates of filovirus disease outbreaks are among the highest reported for any human pathogen, exceeding 90% (ref. 1). Licensed therapeutic or vaccine products are not available to treat filovirus diseases. Candidate therapeutics previously shown to be efficacious in non-human primate disease models are based on virus-specific designs and have limited broad-spectrum antiviral potential. Here we show that BCX4430, a novel synthetic adenosine analogue, inhibits infection of distinct filoviruses in human cells. Biochemical, reporter-based and primer-extension assays indicate that BCX4430 inhibits viral RNA polymerase function, acting as a non-obligate RNA chain terminator. Post-exposure intramuscular administration of BCX4430 protects against Ebola virus and Marburg virus disease in rodent models. Most importantly, BCX4430 completely protects cynomolgus macaques from Marburg virus infection when administered as late as 48 hours after infection. In addition, BCX4430 exhibits broad-spectrum antiviral activity against numerous viruses, including bunyaviruses, arenaviruses, paramyxoviruses, coronaviruses and flaviviruses. This is the first report, to our knowledge, of non-human primate protection from filovirus disease by a synthetic drug-like small molecule. We provide additional pharmacological characterizations supporting the potential development of BCX4430 as a countermeasure against human filovirus diseases and other viral diseases representing major public health threats.

PMID:
24590073
DOI:
10.1038/nature13027
[Indexed for MEDLINE]

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