Physiol. Genomics AJP: Heart and Circulatory Physiology
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Physiol. Genomics 24: 264-275, 2006. First published November 15, 2005; doi:10.1152/physiolgenomics.00234.2004
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Received 7 October 2004; accepted in final form 10 November 2005.
Physiological Genomics 24:264-275 (2006)
American Physiological Society © 2006 American Physiological Society

Distinctive morphological and gene/protein expression signatures during myogenesis in novel cell lines from extraocular and hindlimb muscle

John D. Porter, Sheri Israel, Bendi Gong, Anita P. Merriam, Jason Feuerman, Sangeeta Khanna and Henry J. Kaminski

Departments of Neurology and Neurosciences, Case Western Reserve University and University Hospitals of Cleveland, Cleveland, Ohio

Skeletal muscles are not created equal. The underutilized concept of muscle allotypes defines distinct muscle groups that differ in their intrinsic capacity to express novel traits when exposed to a facilitating extrinsic environment. Allotype-specific traits may have significance as determinants of the preferential involvement or sparing of muscle groups that is observed in a variety of neuromuscular diseases. Little is known, however, of the developmental mechanisms underlying the distinctive skeletal muscle allotypes. The lack of appropriate in vitro models, to dissociate the cell-autonomous and non-cell-autonomous mechanisms behind allotype diversity, has been a barrier to such studies. Here, we derived novel cell lines from the extraocular and hindlimb muscle allotypes and assessed their similarities and differences during early myogenesis using morphological and gene/protein expression profiling tools. Our data establish that there are fundamental differences in the transcriptional and cellular signaling pathways used by the two myoblast lineages. Taken together, these data show that myoblast lineage plays a significant role in the divergence of the distinctive muscle groups or allotypes.

allotype; cell line; DNA microarray; extraocular muscle; limb muscle; myoblast; proteomics






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