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- W2125220201 abstract "The action potential plateau of Purkinje fibers is particularly sensitive to tetrodotoxin (TTX) and this could be due to a TXX-sensitive Na+ current. The expression of TTX-sensitive neuronal NaV1.1 and NaV1.2 isoforms has been reported in canine Purkinje myocytes. Our aim was to investigate by means of biochemical and functional techniques whether the TTX-sensitive skeletal NaV1.4 isoform is also expressed in canine cardiac Purkinje myocytes. Using NaV1.4 specific primers, a PCR product corresponding to NaV1.4 was amplified from canine Purkinje fibers RNA and confirmed by sequencing and megablast of the gene bank. Confocal indirect immunostaining using anti-NaV1.4 antibody demonstrates distinct sarcolemmal staining pattern compared to that of the cardiac isoform NaV1.5. Expression of NaV1.4 in tsA201 cells yielded a TTX-sensitive Na+ current with an IC50 of 10 nM. These results demonstrate the expression of the TTX-sensitive NaV1.4 channel in canine cardiac Purkinje myocytes. This novel finding suggests a role of NaV1.4 channel in Purkinje myocytes and thus has important clinical implications for the mechanisms and management of ventricular arrhythmias originating in the Purkinje network." @default.
- W2125220201 created "2016-06-24" @default.
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- W2125220201 date "2007-03-01" @default.
- W2125220201 modified "2023-10-15" @default.
- W2125220201 title "Expression of skeletal muscle NaV1.4 Na channel isoform in canine cardiac Purkinje myocytes" @default.
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- W2125220201 doi "https://doi.org/10.1016/j.bbrc.2007.01.101" @default.
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