Abstract:
:To light illumination retinal amacrine cells respond with graded depolarization accompanied by a spike discharge. It has been assumed that the graded depolarization is produced solely by the excitatory synaptic inputs from bipolar cells. Here we demonstrate that a tetrodotoxin (TTX)-sensitive persistent current also contributes to the graded depolarization. This current was isolated in amacrine cells of the goldfish retinal slice preparations by the whole-cell patch clamp technique. The activation threshold of the persistent current was about -50 mV, approximately 10 mV more positive than the membrane potential in the dark. Therefore, it is highly likely that the TTX-sensitive persistent current is a booster of the excitatory postsynaptic potential in amacrine cells.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Watanabe S,Satoh H,Koizumi A,Takayanagi T,Kaneko Adoi
10.1016/s0304-3940(99)00903-9keywords:
subject
Has Abstractpub_date
2000-01-07 00:00:00pages
97-100issue
1-2eissn
0304-3940issn
1872-7972pii
S0304-3940(99)00903-9journal_volume
278pub_type
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