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Pain reliever shows anti-viral activity against flu

Date:
March 21, 2013
Source:
American Society for Microbiology
Summary:
The over-the-counter anti-inflammatory drug naproxen may also exhibit antiviral activity against influenza A virus, according to a team of scientists. The findings are the result of a structure-based investigation.
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Scientists report that the over-the-counter anti-inflammatory drug naproxen may also exhibit antiviral activity against influenza A virus.
Credit: © Subbotina Anna / Fotolia

The over-the-counter anti-inflammatory drug naproxen may also exhibit antiviral activity against influenza A virus, according to a team of French scientists. The finding, the result of a structure-based investigation, is published online ahead of print in the journal Antimicrobial Agents and Chemotherapy.

New influenza vaccines must be developed annually, because the surface proteins they target mutate rapidly, the way cars used to get a whole new look every year. The researchers, led by Anny Slama-Schwok of the Institut National de la Recherche Agronomique, Jouy en Josas, France, found a much more stable, reliable target for anti-influenza activity. The so-called ribonucleoprotein complexes are necessary for replication, and the researchers realized they could target the nucleoprotein, preventing assembly of the complexes. Because of its vital function, the nucleoprotein is highly conserved, making it a good potential target for antiviral drugs.

The nucleoprotein's three dimensional structure, solved in 2006, provided the basis for searching for new drugs that could interfere with its action. The researchers did a virtual screening within the Sigma-Aldrich online catalog of biochemicals. That screening identified Naproxen, better known as the over-the-counter pain reliever Aleve, and as expected, it bound to the nucleoprotein, and impeded RNA binding, says Slama-Schwok. In further testing, it reduced the viral load in cells infected with H1N1 and H3N2 influenza A virus, and in mice it demonstrated a therapeutic index against influenza A that was superior to that of any other anti-inflammatory drug.

Specifically, naproxen blocks the RNA binding groove of the nucleoprotein, preventing formation of the ribonucleoprotein complex, thus taking the vital nucleoproteins out of circulation. The researchers write that naproxen is a lead compound for drug development that could be improved by tweaking the molecule to boost its ability to bind to nucleoprotein.

As an already approved drug, naproxen could become a treatment against influenza relatively quickly, the researchers write. Its status as a non-steroidal anti-inflammatory drug (NSAID), which inhibits the COX-2 pathway, as well as an antiviral would boost its efficacy.


Story Source:

The above post is reprinted from materials provided by American Society for Microbiology. Note: Materials may be edited for content and length.


Journal Reference:

  1. N. Lejal, B. Tarus, E. Bouguyon, S. Chenavas, N. Bertho, B. Delmas, R. W. Ruigrok, C. Di Primo, A. Slama-Schwok. Structure-based discovery of the novel antiviral properties of naproxen against the nucleoprotein of Influenza A virus. Antimicrobial Agents and Chemotherapy, 2013; DOI: 10.1128/AAC.02335-12

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American Society for Microbiology. "Pain reliever shows anti-viral activity against flu." ScienceDaily. ScienceDaily, 21 March 2013. <www.sciencedaily.com/releases/2013/03/130321151926.htm>.
American Society for Microbiology. (2013, March 21). Pain reliever shows anti-viral activity against flu. ScienceDaily. Retrieved September 1, 2015 from www.sciencedaily.com/releases/2013/03/130321151926.htm
American Society for Microbiology. "Pain reliever shows anti-viral activity against flu." ScienceDaily. www.sciencedaily.com/releases/2013/03/130321151926.htm (accessed September 1, 2015).

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