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T-type Ca2+ current properties are not modified by Ca2+ channel beta subunit depletion in nodosus ganglion neurons.


ABSTRACT: At the molecular level, our knowledge of the low voltage-activated Ca2+ channel (T-type) has made little progress. Using an antisense strategy, we investigated the possibility that the T-type channels have a structure similar to high voltage-activated Ca2+ channels. It is assumed that high voltage-activated channels are made of at least three components: a pore forming alpha1 subunit combined with a cytoplasmic modulatory beta subunit and a primarily extracellular alpha2delta subunit. We have examined the effect of transfecting cranial primary sensory neurons with generic anti-beta antisense oligonucleotides. We show that in this cell type, blocking expression of all known beta gene products does not affect T-type current, although it greatly decreases the current amplitude of high voltage-activated channels and modifies their voltage dependence. This suggests that beta subunits are likely not constitutive of T-type Ca2+ channels in this cell type.

SUBMITTER: Lambert RC 

PROVIDER: S-EPMC6573151 | biostudies-literature | 1997 Sep

REPOSITORIES: biostudies-literature

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T-type Ca2+ current properties are not modified by Ca2+ channel beta subunit depletion in nodosus ganglion neurons.

Lambert R C RC   Maulet Y Y   Mouton J J   Beattie R R   Volsen S S   De Waard M M   Feltz A A  

The Journal of neuroscience : the official journal of the Society for Neuroscience 19970901 17


At the molecular level, our knowledge of the low voltage-activated Ca2+ channel (T-type) has made little progress. Using an antisense strategy, we investigated the possibility that the T-type channels have a structure similar to high voltage-activated Ca2+ channels. It is assumed that high voltage-activated channels are made of at least three components: a pore forming alpha1 subunit combined with a cytoplasmic modulatory beta subunit and a primarily extracellular alpha2delta subunit. We have ex  ...[more]

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