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 Neurophysioljournal_title
Journal of neurophysiologyauthors
Perrier JF,Hounsgaard Jdoi
10.1152/jn.1999.82.2.730subject
Has Abstractpub_date
1999-08-01 00:00:00pages
730-5issue
2eissn
0022-3077issn
1522-1598journal_volume
82pub_type
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