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Heart drug effective for treating symptom of muscular dystrophy
Date:5/4/2010

ity's Clinical Research Center, where their heart health could be monitored closely. The team found no adverse effects of mexiletine, including no effects on normal cardiac rhythms.

Mexiletine acts to help the muscle compensate for the ion channel abnormality that is at the core of the myotonia in this disease. The myotonia is caused by a sort of molecular stutter that causes electrical signaling in muscle cells to go awry, in effect making muscle stick in the "on" position. The mutation markedly reduces the number of functioning muscle chloride channels and causes decreased movement of the chloride ion across the muscle membrane, leading to excessive muscle irritability and repeated spontaneous activation of muscle fibers. This results in muscle stiffness and delayed relaxation after contraction. Mexiletine works through the sodium channel, which is functioning normally, to decrease muscle irritability.

The new research findings on the effectiveness of mexiletine come amid several exciting research finds by Moxley's colleagues. In one line of research, led by Charles Thornton, M.D., researchers have discovered precisely how a faulty gene actually causes myotonic dystrophy by preventing normal proteins from doing their jobs. Thornton's group then used experimental compounds to break up abnormal cellular deposits of toxic RNA in the nuclei of cells, eliminating myotonia in mice with myotonic dystrophy. Down the hall, a team led by Rabi Tawil, M.D., is part of an international study examining the genetic roots of the second most common form of muscular dystrophy in adults, facioscapulohumeral muscular dystrophy.


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Contact: Tom Rickey
tom_rickey@urmc.rochester.edu
585-275-7954
University of Rochester Medical Center
Source:Eurekalert

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