Alcohol and local anesthetic effects on Na+-dependent Ca2+ fluxes in brain synaptic membrane vesicles.
Alcohol and local anesthetic effects on Na+-dependent Ca2+ fluxes in brain synaptic membrane vesicles.
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酒精和局部麻醉剂对脑突触膜囊泡中 Na 依赖性 Ca2 通量的影响。
DOI:
10.1016/0006-2952(83)90612-3
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发表时间:
1983
影响因子:
5.8
通讯作者:
Michaelis,EK
中科院分区:
文献类型:
--
作者:
Michaelis,ML;Michaelis,EK
Resealed synaptic plasma membrane vesicles exhibit Na+-dependent Ca2+transport activity which may participate in regulation of free Ca2+concentrations in nerve endings. Sodium chloride-loaded vesicles took up Ca2+from the external medium (150 mM KCl-25 mM Tris/HCl) in the presence of an outward-directed Na+gradient, a Ca2+concentration of 38.6 μM producing half-maximal uptake at 23°. Methanol (5–200 mM) and low concentrations of ethanol (5–25 mM) enhanced the Na+-dependent Ca2+influx measured at 23°. Higher ethanol concentrations (100–600 mM), as well as 1-propanol and 1-butanol (10–200 mM), produced only inhibition of Ca2+fluxes. Dixon plot analysis of the inhibitory phase revealed that ethanol inhibited Ca2+uptake in an apparently competitive manner with respect to Ca2+concentration, and the Kiobtained from these experiments was 1.01 M ethanol. The inhibition of Ca2+fluxes by butanol was non-competitive, and theKiwas 68.6 mM. The local anesthetics dibucaine and tetracaine also inhibited Ca2+fluxes with IC50values of 1.8 mM for tetracaine and 0.46 mM for dibucaine. The possible physiologic consequences of this inhibition of Na+-Ca2+countertransport is synaptic membranes by the alcohols and local anesthetics are discussed with regard to neuronal transmission and membrane conductance.
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影响因子:
56.9
作者:
M. Curran;P. Seeman
通讯作者:
P. Seeman
影响因子:
4.7
作者:
E. P. Noble;P. Syapin;R. Vigran;A. Rosenberg
通讯作者:
A. Rosenberg
影响因子:
7.3
作者:
A. Bangham;W. Mason
通讯作者:
W. Mason
DOI:
--
发表时间:
1980
期刊:
影响因子:
--
作者:
M. Ticku
通讯作者:
M. Ticku
影响因子:
5.8
作者:
E. Michaelis;M. Mulvaney;W. Freed
通讯作者:
W. Freed