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Neuromodulation of Dendritic Action Potentials

Neuromodulation of Dendritic Action Potentials Abstract Hoffman, Dax A. and Daniel Johnston. Neuromodulation of dendritic action potentials. J. Neurophysiol. 81: 408–411, 1999. The extent to which regenerative action potentials invade hippocampal CA1 pyramidal dendrites is dependent on both recent activity and distance from the soma. Previously, we have shown that the amplitude of back-propagating dendritic action potentials can be increased by activating either protein kinase A (PKA) or protein kinase C (PKC) and a subsequent depolarizing shift in the activation curve for dendritic K + channels. Physiologically, an increase in intracellular PKA and PKC would be expected upon activation of β-adrenergic and muscarinic acetylcholine receptors, respectively. Accordingly, we report here that activation of either of these neurotransmitter systems results in an increase in dendritic action-potential amplitude. Activation of the dopaminergic neurotransmitter system, which is also expected to raise intracellular adenosine 3′,5′-cyclic monophosphate (cAMP) and PKA levels, increased action-potential amplitude in only a subpopulation of neurons tested. Footnotes Address for reprint requests: D. Johnston, Division of Neuroscience, Baylor College of Medicine, One Baylor Plaza, Houston TX, 77030. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

Neuromodulation of Dendritic Action Potentials

Hoffman, Dax A.; Johnston, Daniel
Journal of Neurophysiology , Volume 81 (1): 408 – Jan 1, 1999
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Publisher
The American Physiological Society
Copyright
Copyright © 2011 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
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Abstract

Abstract Hoffman, Dax A. and Daniel Johnston. Neuromodulation of dendritic action potentials. J. Neurophysiol. 81: 408–411, 1999. The extent to which regenerative action potentials invade hippocampal CA1 pyramidal dendrites is dependent on both recent activity and distance from the soma. Previously, we have shown that the amplitude of back-propagating dendritic action potentials can be increased by activating either protein kinase A (PKA) or protein kinase C (PKC) and a subsequent depolarizing shift in the activation curve for dendritic K + channels. Physiologically, an increase in intracellular PKA and PKC would be expected upon activation of β-adrenergic and muscarinic acetylcholine receptors, respectively. Accordingly, we report here that activation of either of these neurotransmitter systems results in an increase in dendritic action-potential amplitude. Activation of the dopaminergic neurotransmitter system, which is also expected to raise intracellular adenosine 3′,5′-cyclic monophosphate (cAMP) and PKA levels, increased action-potential amplitude in only a subpopulation of neurons tested. Footnotes Address for reprint requests: D. Johnston, Division of Neuroscience, Baylor College of Medicine, One Baylor Plaza, Houston TX, 77030.

Journal

Journal of Neurophysiology – The American Physiological Society

Published: Jan 1, 1999

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