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Biophys J, March 2000, p. 1282-1292, Vol. 78, No. 3

Functional Expression of the L-Type Calcium Channel in Mice Skeletal Muscle during Prenatal Myogenesis

Caroline Strube,* Yves Tourneur,* and Carlos Ojedadagger

 *Laboratoire de Physiologie des Eléments Excitables, UMR Centre National de la Recherche Scientifique 5578, UCB-Lyon 1, 69622 Villeurbanne Cedex, France; and  dagger Institut National de la Santé et de la Recherche Médicale U121, 18 avenue du doyen Lepine, 69500 Bron, France

The densities of skeletal muscle intramembrane charge movement and macroscopic L-type Ca2+ current have been shown to increase during prenatal development. In the present work, the electrophysiological characteristics of L-type Ca2+ channels were analyzed over the embryonic period E14 to E19 using the whole-cell and cell-attached procedures. At the macroscopic level, the whole-cell L-type Ca2+ conductance increased 100% between E14 and E19. This enhancement was accompanied by a small negative shift of the voltage dependence and a marked acceleration of the inactivation kinetics. At the single-channel level, the unitary conductance decreased significantly from 13.2 ± 0.1 pS (n = 8) at E14 to 10.7 ± 0.3 pS (n = 7) at E18 and the open probability was multiplied by 2. No significant change of the density of functional channels was observed during the same period. In contrast to the density of intramembrane charge movement, which, under the same conditions, has been shown to increase between 16 and 19 days, L-type Ca2+ channels properties change mostly between 14 and 16 days. Taken together, these results suggest that the two functions of the dihydropyridine receptor are carried by two different proteins which could be differentially regulated by subunit composition and/or degree of phosphorylation.

Biophys J, March 2000, p. 1282-1292, Vol. 78, No. 3
© 2000 by the Biophysical Society   0006-3495/00/03/1282/11  $2.00


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