Abstract：
:The Xenopus oocyte expression and recording system has allowed a detailed analysis of the physiology and pharmacology of neuronal ion channels including their sensitivity to ethanol. It is important however, to ascertain the effects of a particular drug on the channels inherently expressed by oocytes to ensure that drug effects ascribed to the expressed recombinant receptors are manifested solely through those receptors. In this study, the effects of ethanol were determined on three endogenous currents that can be elicited in oocytes and other cells by various manipulations. The inward cation current, IC, was activated by perfusing naive oocytes with a divalent-free recording solution. Ethanol (25-100 mM) modestly inhibited IC with 100 mM ethanol producing a 7-8% inhibition of steady state currents. The store-operated or capacitative calcium current (I(SOC)) was activated in thapsigargin-treated oocytes by switching from a calcium-free solution to one containing 10 mM calcium. In thapsigargin-treated oocytes also injected with EGTA to block calcium-activated chloride currents, ethanol (100 mM) had no effect on the store-operated calcium current. In contrast, ethanol (10-100 mM) dose-dependently inhibited the calcium-dependent chloride current (I(Cl(Ca)) in thapsigargin-treated oocytes. A voltage-jump protocol was used to separate the two components of I(Cl(Ca)), I(Cl-1) and I(Cl-2). Under these conditions, ethanol (100 mM) inhibited I(Cl-1) currents to a greater extent (38%) than it did I(Cl-2) currents (14%). These results show that Xenopus oocytes express endogenous ion channels that are differentially sensitive to ethanol.
journal_name
Neurochem Intjournal_title
Neurochemistry internationalauthors
Clayton R,Woodward JJdoi
10.1016/s0197-0186(99)00097-2subject
Has Abstractpub_date
2000-01-01 00:00:00pages
67-74issue
1eissn
0197-0186issn
1872-9754pii
S0197-0186(99)00097-2journal_volume
36pub_type
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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更新日期：1980-01-01 00:00:00
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2007.03.006
更新日期：2007-07-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
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更新日期：1994-10-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
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journal_title：Neurochemistry international
pub_type： 杂志文章
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journal_title：Neurochemistry international
pub_type： 杂志文章,评审
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更新日期：2007-06-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2007.04.005
更新日期：2007-11-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
pub_type： 杂志文章
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更新日期：1988-01-01 00:00:00
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更新日期：2002-08-01 00:00:00
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journal_title：Neurochemistry international
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更新日期：2019-10-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
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更新日期：1991-01-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
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更新日期：1998-09-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章,评审
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更新日期：1997-04-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2005.12.012
更新日期：2006-06-01 00:00:00
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journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(88)90165-9
更新日期：1988-01-01 00:00:00
