Ca(2+)-activated nonselective cationic current (I(CAN)) in turtle motoneurons.

Abstract:

:The presence of a calcium-activated nonspecific cationic (CAN) current in turtle motoneurons and its involvement in plateau potentials, bistability, and wind-up was investigated by intracellular recordings in a spinal cord slice preparation. In the presence of tetraethylammonium (TEA) and tetrodotoxin (TTX), calcium action potentials evoked by depolarizing current pulses were always followed by an afterdepolarization associated with a decrease in input resistance. The presence of the afterdepolarization depended on the calcium spike and not on membrane potential. Replacement of extracellular sodium by choline or N-methyl-D-glucamine (NMDG) reduced the afterdepolarization, confirming that it was mediated by a CAN current. Plateau potentials and wind-up were evoked in response to intracellular current pulses in the presence of agonist for different metabotropic receptors. Replacement of extracellular sodium by choline or NMDG did not abolish the generation of plateau potentials, bistability, or wind-up, showing that Na(+) was not the principal charge carrier. It is concluded that plateau potentials, bistability and wind-up in turtle motoneurons do not depend on a CAN current even though its presence can be detected.

journal_name

J Neurophysiol

authors

Perrier JF,Hounsgaard J

doi

10.1152/jn.1999.82.2.730

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

730-5

issue

2

eissn

0022-3077

issn

1522-1598

journal_volume

82

pub_type

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