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Regulation of short-term associative memory by calcium-dependent protein kinase

LD Matzel, II Lederhendler and DL Alkon
Journal of Neuroscience 1 July 1990, 10 (7) 2300-2307; DOI: https://doi.org/10.1523/JNEUROSCI.10-07-02300.1990
LD Matzel
Section on Neural Systems, National Institutes of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892.
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II Lederhendler
Section on Neural Systems, National Institutes of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892.
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DL Alkon
Section on Neural Systems, National Institutes of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892.
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Abstract

Neural and behavioral correlates of an associative memory in Hermissenda were examined during induction and/or formation of the memory. Hermissenda received either light (conditioned stimulus or CS) and rotation (unconditioned stimulus or US) paired (i.e., Pavlovian conditioning), light and rotation unpaired (pseudoconditioning), or no exposure to light and rotation. Following 9 pairings in a 6 min session, conditioned animals exhibited a contraction of the foot in response to a test CS presented 2 min after the last conditioning trial, whereas pseudoconditioned and untreated animals exhibited a foot extension to the same CS. In addition, both an associative and a nonassociative reduction in light-induced locomotion was observed. To examine neural correlates of this learning within minutes of acquisition, the isolated nervous system of the Hermissenda (containing the visual and vestibular organs) was trained with stimulus conditions identical to those used for the intact animal. Prior isolation and preparation of the nervous system permitted immediate intracellular recording following the final conditioning trial. Relative to pseudoconditioned and untreated animals, the B photoreceptors in conditioned nervous systems were found to have elevated input resistance (inversely related to K+ channel conductance and positively related to excitability) and exhibited increased steady-state depolarization in response to the light CS, as well as a prolonged depolarization after the CS offset. These neural correlates of the associative memory were attenuated if the protein kinase inhibitor H7 was present in the extracellular bath during conditioning, demonstrating in the reduced preparation that antagonism of protein kinase activity blocks the induction of membrane alterations of identified neurons that correlate with memory storage.(ABSTRACT TRUNCATED AT 250 WORDS)

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The Journal of Neuroscience: 10 (7)
Journal of Neuroscience
Vol. 10, Issue 7
1 Jul 1990
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Regulation of short-term associative memory by calcium-dependent protein kinase
LD Matzel, II Lederhendler, DL Alkon
Journal of Neuroscience 1 July 1990, 10 (7) 2300-2307; DOI: 10.1523/JNEUROSCI.10-07-02300.1990

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Regulation of short-term associative memory by calcium-dependent protein kinase
LD Matzel, II Lederhendler, DL Alkon
Journal of Neuroscience 1 July 1990, 10 (7) 2300-2307; DOI: 10.1523/JNEUROSCI.10-07-02300.1990
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