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New agent inhibits HCV replication in mouse models: No resistance seen

Date:
May 30, 2013
Source:
American Society for Microbiology
Summary:
Treatments against hepatitis C virus have only been partially successful. A major problem is that antivirals generate drug resistance. Now scientists have developed agents that bind to the business end of a critical protein, disabling it so successfully that no resistance has arisen.

Treatments against hepatitis C virus have only been partially successful. A major problem is that antivirals generate drug resistance. Now Seong-Wook Lee of Dankook University, Yongin, Republic of Korea and his collaborators have developed agents that bind to the business end of a critical protein, disabling it so successfully that no resistance has arisen. The research is published in the June 2013 issue of the Journal of Virology.

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The target protein for the new agents is the NS5B replicase protein, which is the central catalytic enzyme in HCV replication. The researchers developed "RNA aptamers" which bind tightly to the part of that protein that performs the catalysis, disabling the replicase. Aptamers are short nucleic acids or peptides that provide the same level of recognition and binding ability that is common to antibodies.

The aptamers inhibited HCV replication without generating escape mutants, says Lee. Moreover, the aptamers inhibited diverse genotypes of HCV, neither causing toxicity nor inducing innate immunity, he says. Lee notes that in the study, therapeutic quantities of ligand-conjugated aptamer penetrated the liver tissue in the mice, raising the likelihood that therapeutically effective quantities could ultimately be achieved in HCV patients.

Roughly 170 million people worldwide are infected with HCV, says Lee, and it is the major cause of chronic hepatitis, cirrhosis, and hepatocellular carcinoma. There is as yet "no efficient and specific single regimen against HCV," says Lee. Current treatments are associated with many side effects, partly because rapid generation of drug-resistant virus has forced clinicians to use combinations of several drugs, resulting in greater numbers of side effects in patients than if a single agent could be used. And even with the drug combinations only some patients can generate a sustained antiviral response.


Story Source:

The above story is based on materials provided by American Society for Microbiology. Note: Materials may be edited for content and length.


Journal Reference:

  1. C. H. Lee, Y. J. Lee, J. H. Kim, J. H. Lim, J.-H. Kim, W. Han, S.-H. Lee, G.-J. Noh, S.-W. Lee. Inhibition of Hepatitis C Virus (HCV) Replication by Specific RNA Aptamers against HCV NS5B RNA Replicase. Journal of Virology, 2013; 87 (12): 7064 DOI: 10.1128/JVI.00405-13

Cite This Page:

American Society for Microbiology. "New agent inhibits HCV replication in mouse models: No resistance seen." ScienceDaily. ScienceDaily, 30 May 2013. <www.sciencedaily.com/releases/2013/05/130530111305.htm>.
American Society for Microbiology. (2013, May 30). New agent inhibits HCV replication in mouse models: No resistance seen. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2013/05/130530111305.htm
American Society for Microbiology. "New agent inhibits HCV replication in mouse models: No resistance seen." ScienceDaily. www.sciencedaily.com/releases/2013/05/130530111305.htm (accessed October 24, 2014).

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