PMID: 6109761Feb 1, 1981Paper

The Na+,K+-ATPase: a plausible trigger for voltage-independent release of cytoplasmic neurotransmitters

Journal of Neurochemistry
J V O'FallonJ W Harding

Abstract

A comparison was made between the releasability of eight neurotransmitters from eight regions of mouse brain in response to either 60 mM-K+ or 20 microM-ouabain, a specific inhibitor of the Na+,K+-ATPase. With few exceptions, all transmitters were released by either or both agents from each brain region examined. Potassium was superior in releasing the biogenic amines and acetylcholine, while the putative amino acid transmitters were generally releasable by both agents. Measurements of tissue depolarization using [3H]-tetraphenylphosphonium uptake indicated that 60 mM-K+ is capable of depolarizing brain tissue above the threshold necessary for initiating an action potential, but 20 microM-ouabain is not. The pattern of release by ouabain coupled with its failure to depolarize brain tissue at 20 microM suggests that inhibition of the Na+,K+-ATPase is capable of releasing cytoplasmic neurotransmitters in a voltage-independent manner.

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Citations

Mar 1, 1983·Naunyn-Schmiedeberg's Archives of Pharmacology·M D Wood, M G Wyllie
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Jun 1, 1983·Journal of Autonomic Pharmacology·D A Powis
Nov 1, 1981·Journal of Neurochemistry·M Sandberg, I Jacobson

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