Abstract:
:The role of the late afterhyperpolarization (late AHP) in the firing properties of lamprey spinal neurons was tested by bath application of apamin, a selective blocker of the sk calcium-dependent potassium current. Intracellular recordings of identified motoneurons and interneurons were made with micropipette electrodes in the isolated lamprey spinal cord. Apamin reversibly reduced the amplitude of the late afterhyperpolarization without affecting other aspects of the action potential or the resting potential. The firing frequencies of the neurons were enhanced by apamin over a range of depolarizing current pulse injections. The effect of apamin was also tested on fictive swimming, which was induced in the isolated spinal cord by bath application of an excitatory amino acid (D-glutamate or N-methyl-D,L-aspartate). A concentration of apamin (10 microM) sufficient to substantially reduce the late AHP had no significant effect on the ventral root burst rate, intensity, or phase lag during fictive swimming.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Meer DP,Buchanan JTdoi
10.1016/0304-3940(92)90219-wkeywords:
subject
Has Abstractpub_date
1992-08-31 00:00:00pages
1-4issue
1-2eissn
0304-3940issn
1872-7972pii
0304-3940(92)90219-Wjournal_volume
143pub_type
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