PMID: 6111794Dec 1, 1980Paper

Intracellular injection of t he catalytic subunit of cyclic AMP-dependent protein kinase simulates facilitation of transmitter release underlying behavioral sensitization in Aplysia

Proceedings of the National Academy of Sciences of the United States of America
V F CastellucciP Greengard

Abstract

It has been difficult to establish whether cyclic AMP-mediated protein phosphorylation in nerve cells plays a specific role in synaptic transmission. This difficulty can be overcome in higher invertebrates because their large neurons allow the injection of protein molecules into the cell. We have used intracellular injection to study whether protein phosphorylation is involved in the mechanism of sensitization, a simple form of learning. Sensitization of the gill-withdrawal reflex in Aplysia involves enhancement of transmitter release by presynaptic facilitation at a particular set of synaptic connections between identified sensory neurons and their follower cells. We have found that injection of the catalytic subunit of cyclic AMP-dependent protein kinase (ATP:protein phosphotransferase, EC 2.7.1.37) purified from bovine heart mimics the action of the natural transmitter and of serotonin, the putative transmitter, by simulating the physiological changes that accompany presynaptic facilitation. Intracellular injection of the kinase into a sensory cell (i) broadens the action potential in the presence of tetraethylammonium, indicating an increase in Ca2+ current, (ii) decreases the input conductance of the cell, presumably as a ...Continue Reading

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Citations

Jun 1, 1985·Cellular and Molecular Neurobiology·T W Abrams
Mar 1, 1990·Neuroscience and Behavioral Physiology·B I Kotlyar, A S Pivovarov
Jan 1, 1994·Journal of Neural Transmission. General Section·N MinamiT Dohi
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Jul 6, 2013·Trends in Neurosciences·Christopher D LandryPriyamvada Rajasethupathy
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Apr 1, 1984·Proceedings of the National Academy of Sciences of the United States of America·G A Clark, E R Kandel

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