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Why long-term antibiotic use increases infection with a mycobacterium

Date:
August 1, 2011
Source:
Journal of Clinical Investigation
Summary:
The clinical outcome is improved if patients with chronic lung diseases such as cystic fibrosis are treated long-term with the antibiotic azithromycin. However, azithromycin treatment in patients with cystic fibrosis as recently associated with increased infection with nontuberculous mycobacteria. Now, researchers have confirmed that long-term use of azithromycin by adults with cystic fibrosis is associated with infection with nontuberculous mycobacteria and identified an underlying mechanism.
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FULL STORY

The clinical outcome is improved if patients with chronic lung diseases such as cystic fibrosis are treated long-term with the antibiotic azithromycin. However, azithromycin treatment in patients with cystic fibrosis as recently associated with increased infection with nontuberculous mycobacteria. Now, researchers have confirmed that long-term use of azithromycin by adults with cystic fibrosis is associated with infection with nontuberculous mycobacteria and identified an underlying mechanism.

Azithromycin is an antibiotic that also has antiinflammatory properties. It is these antiinflammatory properties that are thought to account for the improvement in clinical outcome observed when patients with chronic lung diseases such as cystic fibrosis are treated long-term with azithromycin.

However, a recent study indicated that azithromycin treatment in patients with cystic fibrosis is associated with increased infection with nontuberculous mycobacteria, a serious complication in such individuals. Now, a team of researchers -- led by Andres Floto and David Rubinsztein, at the University of Cambridge, United Kingdom; and Diane Ordway, at Colorado State University, Fort Collins -- has confirmed that long-term use of azithromycin by adults with cystic fibrosis is associated with infection with nontuberculous mycobacteria and identified an underlying mechanism.

Specifically, the team found that in mice, azithromycin treatment inhibited the intracellular killing of nontuberculous mycobacteria within immune cells known as macrophages by impairing the cellular process autophagy. As azithromycin was not known to block autophagy prior to this work, these data highlight a clinical danger associated with inadvertent pharmacological blockade of this important cellular process.


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The above story is based on materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


Journal Reference:

  1. Maurizio Renna, Catherine Schaffner, Karen Brown, Shaobin Shang, Marcela Henao Tamayo, Krisztina Hegyi, Neil J. Grimsey, David Cusens, Sarah Coulter, Jason Cooper, Anne R. Bowden, Sandra M. Newton, Beate Kampmann, Jennifer Helm, Andrew Jones, Charles S. Haworth, Randall J. Basaraba, Mary Ann DeGroote, Diane J. Ordway, David C. Rubinsztein, R. Andres Floto. Azithromycin blocks autophagy and may predispose cystic fibrosis patients to mycobacterial infection. Journal of Clinical Investigation, 2011; DOI: 10.1172/JCI46095

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Journal of Clinical Investigation. "Why long-term antibiotic use increases infection with a mycobacterium." ScienceDaily. ScienceDaily, 1 August 2011. <www.sciencedaily.com/releases/2011/08/110801122952.htm>.
Journal of Clinical Investigation. (2011, August 1). Why long-term antibiotic use increases infection with a mycobacterium. ScienceDaily. Retrieved May 26, 2015 from www.sciencedaily.com/releases/2011/08/110801122952.htm
Journal of Clinical Investigation. "Why long-term antibiotic use increases infection with a mycobacterium." ScienceDaily. www.sciencedaily.com/releases/2011/08/110801122952.htm (accessed May 26, 2015).

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