Abstract:
:High K+ (50 mM) increased both [3H]acetylcholine ([3H]ACh) release and cytosolic free calcium level ([Ca2+]i) in rat brain synaptosomes in the presence of extracellular Ca2+. Ouabain (5 x 10(-8) to 5 x 10(-4) M) also caused a dose-dependent increase in [3H]ACh release, but not in [Ca2+]i, in the absence of Ca2+. The effects of high K+ and ouabain on [3H]ACh and/or [Ca2+]i, were inhibited by the intracellular Ca2+ antagonist TMB-8 (10(-4) M). These results suggest that unlike high K+, ouabain increases transmitter release from nerve endings through a mechanism which is independent of [Ca2+]i, but sensitive to TMB-8.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Satoh E,Nakazato Ydoi
10.1016/0304-3940(89)90832-xsubject
Has Abstractpub_date
1989-12-15 00:00:00pages
284-8issue
1-3eissn
0304-3940issn
1872-7972pii
0304-3940(89)90832-Xjournal_volume
107pub_type
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journal_title:Neuroscience letters
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