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Missing protein restored in patients with muscular dystrophy

Date:
August 20, 2014
Source:
Universität Basel
Summary:
A research team has succeeded in restoring a missing repair protein in skeletal muscle of patients with muscular dystrophy, a scientific first. The team has offered a proof-of-principle study and restored the missing protein in skeletal muscle of patients with muscular dystrophy. Three patients carrying a dysferlin mutation received a single systemic dose of a proteasome inhibitor. After only a few days the patients’ musculature produced the missing dysferlin protein at levels that could be therapeutically effective.

3D reconstructions of dysferlin localization in muscle biopsies from a healthy subject (left panel), from a dysferlin deficient patient before (middle panel) and 36 hours after (right panel) systemic administration of a single dose of the proteasome inhibitor bortezomib.
Credit: Illustration: Neuromuscular Center, Clinic of Neurology, University Hospital of Basel

When muscle cell membranes are damaged, the repair protein dysferlin is activated and reseals muscle membrane tears. If this repair protein is altered due to a genetic mutation, the body's own "quality control" system (the so called proteasome) identifies the protein as being defective and eliminates it. Without dysferlin, injured muscle cell membranes cannot be repaired, which leads to progressive loss of skeletal muscle cells and thus to muscle wasting. It appears that the body's own quality control system neutralizes mutated dysferlin even if the mutation does not actually impair its repair function.

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Repair protein reactivated

The research group led by Professor Michael Sinnreich at the Departments of Neurology and Biomedicine at the University and the University Hospital of Basel had previously demonstrated that proteasome inhibitors can reactivate mutated dysferlin proteins in cultured muscle cells from muscular dystrophy patients. The inhibition of the exaggerated cellular quality control enables the altered repair protein to regain its function and to repair damaged muscle membranes.

Now the team has translated these findings into clinical application and has, in a proof-of-principle study, restored the missing dysferlin protein in skeletal muscle of patients with muscular dystrophy. Three patients carrying a dysferlin mutation received a single systemic dose of a proteasome inhibitor. After only a few days the patients' musculature produced the missing dysferlin protein at levels that could be therapeutically effective.

Long-term trial planned

For Head of Research Michael Sinnreich, the new findings serve as groundwork for future long-term clinical trials: "These findings could be of importance for the treatment of patients with muscular dystrophy as well as other, previously incurable genetic diseases."

The study was funded by the Gebert Rüf Foundation, the Uniscientia Foundation, the Swiss National Science Foundation, the Neuromuscular Research Association Basel, the Association Française contre les Myopathies, the Swiss Muscle Society as well as the Swiss Foundation for Research on Muscle Diseases, and conducted with the support of the Clinical Trial Unit of the Basel University Hospital.


Story Source:

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


Journal Reference:

  1. B. A. Azakir, B. Erne, S. Di Fulvio, G. Stirnimann, M. Sinnreich. Proteasome inhibitors increase missense mutated dysferlin in patients with muscular dystrophy. Science Translational Medicine, 2014; 6 (250): 250ra112 DOI: 10.1126/scitranslmed.3009612

Cite This Page:

Universität Basel. "Missing protein restored in patients with muscular dystrophy." ScienceDaily. ScienceDaily, 20 August 2014. <www.sciencedaily.com/releases/2014/08/140820164410.htm>.
Universität Basel. (2014, August 20). Missing protein restored in patients with muscular dystrophy. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2014/08/140820164410.htm
Universität Basel. "Missing protein restored in patients with muscular dystrophy." ScienceDaily. www.sciencedaily.com/releases/2014/08/140820164410.htm (accessed November 27, 2014).

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