Cause of Progression in Duchenne Muscular Dystrophy: Impaired Differentiation More Probable Than Replicative Aging

Replicative aging of myogenic cells (satellite cells) owing to enhanced myofiber turnover is a common explanation of the progression of Duchenne muscular dystrophy (DMD). This hypothesis has been reexamined recently by telomere length measurements in dystrophic tissue. We evaluate the controversial results of these studies. We also review a large body of in vitro, animal (mdx), and patient data which indicate that impaired differentiation, but not replicative aging, is the leading cause of progression in DMD. We recommend in vivo investigations of cell kinetics in DMD muscle, as well as telomere length and telomerase analyses of DMD satellite cells in vitro for a definite judgement of the replicative aging hypothesis. Analogous investigations were helpful in AIDS research where replicative aging was embraced as a simple explanation of the paradigmatic CD4 lymphocyte decline but had to be rejected in favour of more complex models of disturbed lymphocyte homeostasis and regeneration. The question of replicative aging versus impaired differentiation is relevant for the understanding of therapeutic failures and the design of new strategies. Impaired differentiation is compatible with the failure of myoblast transfer in DMD and calls for further studies on the myofiber environment. Replicative aging, on the other hand, could possibly be treated by telomerase gene delivery.

Key words

Muscular dystrophy - Differentiation - Satellite cells - Replicative aging - Telomeres

References

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