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Abstract
As a test of the generalised defect theory for Duchenne muscular dystrophy (DMD),
basal and calcium-dependent platelet protein phosphorylation was examined in order
to determine if the increased concentration of calcium in DMD skeletal muscle is reflected
in DMD platelets.
Protein phosphorylation was quantitated by gradient slab gel electrophoresis and autoradiography.
The number of phosphoproteins in each phosphoprotein peak was determined by comparison
with two-dimensional gel electrophoresis. Many phosphoprotein peaks were present in
unstimulated platelet preparations both in whole platelet homogenates and in intact
platelets. Two of these phosphoprotein peaks were calciumdependent, one was a single
phosphoprotein, the other consisted of 4 phosphoproteins. No disease-related differences
were observed in either basal or calcium-stimulated phosphoproteins.
These results do not support previous reports of platelet abnormalities in DMD, and
provide further evidence that the biochemical defect in Duchenne muscular dystrophy
is neither generalised nor a membrane defect. The biochemical defect in DMD should
be regarded as a skeletal muscle abnormality until proved otherwise.
Keywords
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Article info
Footnotes
☆This work was supported by grants from the National Health and Medical Research Council of Australia.
Identification
Copyright
© 1984 Published by Elsevier Inc.