title: Sodium current properties of primary skeletal myocytes and cardiomyocytes derived from different mouse strains.
abstract: The mouse has become the preferred animal for genetic manipulations. Because of the diverse genetic backgrounds of various mouse strains, these can manifest strikingly different characteristics. Here, we studied the functional properties of currents through voltage-gated sodium channels in primary cultures of skeletal myocytes and cardiomyocytes derived from the three commonly used mouse strains BL6, 129/Sv, and FVB, by using the whole-cell patch-clamp technique. We found strain-specific sodium current function in skeletal myocytes, which could partly be explained by differences in sodium channel isoform expression. In addition, we found significant effects of cell source (neonatal or adult animal-derived) and variation of the differentiation time period. In contrast to skeletal myocytes, sodium current function in cardiomyocytes was similar in all strains. Our findings are relevant for the design and proper interpretation of electrophysiological studies, which use excitable cells in primary culture as a model system.
authors.affiliation: Institute of Pharmacology, Center for Biomolecular Medicine and Pharmacology, Medical University of Vienna, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Mille
authors.forename: X
authors.initials: X
authors.lastname: Koenig
authors.forename: E
authors.initials: E
authors.lastname: Zebedin
authors.forename: P
authors.initials: P
authors.lastname: Uhrin
authors.forename: R
authors.initials: R
authors.lastname: Cervenka
authors.forename: H
authors.initials: H
authors.lastname: Todt
authors.forename: K
authors.initials: K
authors.lastname: Hilber
mesh_terms: D000375:Aging; D000818:Animals; D000831:Animals, Newborn; D002478:Cells, Cultured; D005260:Female; D015640:Ion Channel Gating / Q000502:physiology; D051379:Mice; D018485:Muscle Fibers, Skeletal / Q000502:physiology*; D032383:Myocytes, Cardiac / Q000502:physiology*; D018408:Patch-Clamp Techniques; D015222:Sodium Channels / Q000502:physiology*; D013045:Species Specificity
chemical_list: D015222:Sodium Channels