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Impaired activity of the protein MTOR a strain on the heart

Date:
July 19, 2010
Source:
Journal of Clinical Investigation
Summary:
New research in mice suggests that drugs that inhibit the protein MTOR, which are used to treat several forms of cancer, might have adverse effects on heart function in patients with ongoing heart dysfunction.
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A team of researchers, led by Gianluigi Condorelli, at the University of California San Diego, La Jolla, has generated data in mice that suggest that drugs that inhibit the protein MTOR, which are used to treat several forms of cancer, might have adverse effects on heart function in patients with ongoing heart dysfunction.

In the study, it was found that adult mice lacking MTOR in their heart muscle cells developed a fatal heart condition. Disease was associated with accumulation of the protein 4E-BP1, which is an inhibitor of protein generation that is normally held in check by a protein complex containing MTOR. Further analysis indicated that in a model of high blood pressure the mice lacking MTOR in their heart muscle cells developed heart failure more quickly than did normal mice. Importantly, deletion of 4E-BP1 under these conditions improved heart function and survival.

Thus, decreased MTOR activity impairs the protective heart response to stress, by enhancing 4E-BP1 activity, providing a potential new therapeutic strategy for improving heart function in patients with heart failure and a warning to clinicians using MTOR inhibitors.

The research appears in the Journal of Clinical Investigation.


Story Source:

The above post is reprinted from materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


Journal Reference:

  1. Zhang et al. MTORC1 regulates cardiac function and myocyte survival through 4E-BP1 inhibition in mice. Journal of Clinical Investigation, 2010; DOI: 10.1172/JCI43008

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Journal of Clinical Investigation. "Impaired activity of the protein MTOR a strain on the heart." ScienceDaily. ScienceDaily, 19 July 2010. <www.sciencedaily.com/releases/2010/07/100719124402.htm>.
Journal of Clinical Investigation. (2010, July 19). Impaired activity of the protein MTOR a strain on the heart. ScienceDaily. Retrieved July 6, 2015 from www.sciencedaily.com/releases/2010/07/100719124402.htm
Journal of Clinical Investigation. "Impaired activity of the protein MTOR a strain on the heart." ScienceDaily. www.sciencedaily.com/releases/2010/07/100719124402.htm (accessed July 6, 2015).

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