Effect of calcium on Na-K-ATPase activity in depolarized rat cortical synaptosomes as determined on the basis of oxygen consumption

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Abstract

The oxygen consumption of rat cortical synaptosomes together with its ouabain-sensitive component were measured after veratrine-induced depolarization in the presence and in the absence of calcium, and with calcium added after depolarization by veratrine or potassium. Taking the ouabainsensitive component of oxygen consumption as an indicator of Na-K-ATPase activity it was concluded that calcium entry during depolarization decreased synaptosomal Na-K-ATPase activity only slightly and in a protracted manner. Consequently, Ca++-induced inhibition of Na-K-ATPase does not seem to serve as a "trigger" mechanism of transmitter release.

Original languageEnglish
Pages (from-to)380-384
Number of pages5
JournalExperimental Brain Research
Volume60
Issue number2
DOIs
Publication statusPublished - Oct 1985

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Synaptosomes
Veratrine
Oxygen Consumption
Calcium
Ouabain
Potassium
sodium-translocating ATPase

Keywords

  • Calcium
  • Na-K-ATPase
  • Oxygen consumption
  • Synaptosomes

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

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abstract = "The oxygen consumption of rat cortical synaptosomes together with its ouabain-sensitive component were measured after veratrine-induced depolarization in the presence and in the absence of calcium, and with calcium added after depolarization by veratrine or potassium. Taking the ouabainsensitive component of oxygen consumption as an indicator of Na-K-ATPase activity it was concluded that calcium entry during depolarization decreased synaptosomal Na-K-ATPase activity only slightly and in a protracted manner. Consequently, Ca++-induced inhibition of Na-K-ATPase does not seem to serve as a {"}trigger{"} mechanism of transmitter release.",
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T1 - Effect of calcium on Na-K-ATPase activity in depolarized rat cortical synaptosomes as determined on the basis of oxygen consumption

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N2 - The oxygen consumption of rat cortical synaptosomes together with its ouabain-sensitive component were measured after veratrine-induced depolarization in the presence and in the absence of calcium, and with calcium added after depolarization by veratrine or potassium. Taking the ouabainsensitive component of oxygen consumption as an indicator of Na-K-ATPase activity it was concluded that calcium entry during depolarization decreased synaptosomal Na-K-ATPase activity only slightly and in a protracted manner. Consequently, Ca++-induced inhibition of Na-K-ATPase does not seem to serve as a "trigger" mechanism of transmitter release.

AB - The oxygen consumption of rat cortical synaptosomes together with its ouabain-sensitive component were measured after veratrine-induced depolarization in the presence and in the absence of calcium, and with calcium added after depolarization by veratrine or potassium. Taking the ouabainsensitive component of oxygen consumption as an indicator of Na-K-ATPase activity it was concluded that calcium entry during depolarization decreased synaptosomal Na-K-ATPase activity only slightly and in a protracted manner. Consequently, Ca++-induced inhibition of Na-K-ATPase does not seem to serve as a "trigger" mechanism of transmitter release.

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KW - Oxygen consumption

KW - Synaptosomes

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