Abstract
The mechanisms underlying the effects of cannabinoids on cognitive processes are not understood. Here we show that cannabinoid type-1 receptors (CB1Rs) control hippocampal synaptic plasticity and spatial memory through the hyperpolarization-activated cyclic nucleotide-gated (HCN) channels that underlie the h-current (Ih), a key regulator of dendritic excitability. The CB1R-HCN pathway, involving c-Jun-N-terminal kinases (JNKs), nitric oxide synthase, and intracellular cGMP, exerts a tonic enhancement of Ih selectively in pyramidal cells located in the superficial portion of the CA1 pyramidal cell layer, whereas it is absent from deep-layer cells. Activation of the CB1R-HCN pathway impairs dendritic integration of excitatory inputs, long-term potentiation (LTP), and spatial memory formation. Strikingly, pharmacological inhibition of Ih or genetic deletion of HCN1 abolishes CB1R-induced deficits in LTP and memory. These results demonstrate that the CB1R-Ih pathway in the hippocampus is obligatory for the action of cannabinoids on LTP and spatial memory formation.
Original language | English |
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Pages (from-to) | 1059-1073 |
Number of pages | 15 |
Journal | Neuron |
Volume | 89 |
Issue number | 5 |
DOIs | |
State | Published - Mar 2 2016 |
Bibliographical note
Funding Information:We thank K. Mackie for providing JNK KO mice; S. Siegelbaum for providing the forebrain-restricted HCN1KO mice; G. Marsicano for providing the GLU-, GABA-, and global-CB1RKO mice; and T. Nguyen and S. Felong for technical support. This work was supported by the U.S. National Institutes of Health (NS35915 and NS94668 to I.S., F31NS086429 to A.B., and R25NS065741-04S1 to A.A.), the National Aeronautics and Space Administration (NSCOR NNX10AD59G to I.S.), and by a European Molecular Biology Organization (EMBO) long-term fellowship to M.M.
Funding Information:
We thank K. Mackie for providing JNK KO mice; S. Siegelbaum for providing the forebrain-restricted HCN1KO mice; G. Marsicano for providing the GLU-, GABA-, and global-CB1RKO mice; and T. Nguyen and S. Felong for technical support. This work was supported by the U.S. National Institutes of Health (NS35915 and NS94668 to I.S., F31NS086429 to A.B., and R25NS065741-04S1 to A.A.), the National Aeronautics and Space Administration (NSCOR NNX10AD59G to I.S.), and by a European Molecular Biology Organization (EMBO) long-term fellowship to M.M.
Publisher Copyright:
© 2016 Elsevier Inc.
ASJC Scopus subject areas
- Neuroscience (all)