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Nat Neurosci. 2000 Feb;3(2):133-41.

Enhancement of synaptic transmission by cyclic AMP modulation of presynaptic Ih channels.

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Division of Neurobiology, Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA.


Presynaptic activation of adenylyl cyclase and subsequent generation of cAMP represent an important mechanism in the modulation of synaptic transmission. In many cases, short- to medium-term modulation of synaptic strength by cAMP is due to activation of protein kinase A and subsequent covalent modification of presynaptic ion channels or synaptic proteins. Here we show that presynaptic cAMP generation via serotonin receptor activation directly modulated hyperpolarization-activated cation channels (Ih channels) in axons. This modulation of Ih produced an increase in synaptic strength that could not be explained solely by depolarization of the presynaptic membrane. These studies identify a mechanism by which cAMP and Ih regulate synaptic plasticity.

[Indexed for MEDLINE]

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