New insights in the regulation of calcium transfers by muscle dystrophin-based cytoskeleton: implications in DMD

  • Bruno Constantin
  • Stéphane Sebille
  • Christian Cognard


Calcium mishandling in Duchenne muscular dystrophy (DMD) suggested that dystrophin, a membrane-associated cytoskeleton protein, may regulate calcium-signalling cascades such as calcium entries. Calcium overload in human DMD myotubes is dependent on their contractile activity suggesting the involvement of channels being activated during contraction and/or calcium release. Forced expression of mini-dystrophin in dystrophin-deficient myotubes, reactivates appropriate sarcolemmal expression of dystrophin-associated proteins and restores normal calcium handling in the cytosol. Furthermore, the recombinant mini-dystrophin reduced the store-operated calcium influx across the sarcolemma, and the mitochondrial calcium uptake during this influx. A slow component of calcium release dependent on IP3R, as well as the production of IP3, were also reduced to normal levels by expression of mini-dystrophin. Our studies provide a new model for the convergent regulation of transmembrane calcium influx and IP3-dependent calcium release by the dystrophin-based cytoskeleton (DBC). We also suggest molecular association of such channels with DBC which may provide the scaffold for assembling a multiprotein-signalling complex that modulates the channel activity. This suggests that the loss of this molecular association could participate in the alteration of calcium homeostasis observed in DMD muscle cells.


Skeletal muscle Duchenne muscular dystrophy Dystrophine Calcium signalling Stone-operated calcium entries Inositol [1,3,5] triphosphate receptor Mitochondrial calcium uptake 


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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Bruno Constantin
    • 1
  • Stéphane Sebille
    • 1
  • Christian Cognard
    • 1
  1. 1.Institut de Physiologie et Biologie Cellulaires, CNRS, UMR-6187University of PoitiersPoitiersFrance

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