HCN1 Channels Constrain Synaptically Evoked Ca2+ Spikes in Distal Dendrites of CA1 Pyramidal Neurons Export

@article{citeulike:2265584, abstract = {Summary HCN1 hyperpolarization-activated cation channels act as an inhibitory constraint of both spatial learning and synaptic integration and long-term plasticity in the distal dendrites of hippocampal CA1 pyramidal neurons. However, as HCN1 channels provide an excitatory current, the mechanism of their inhibitory action remains unclear. Here we report that HCN1 channels also constrain CA1 distal dendritic Ca2+ spikes, which have been implicated in the induction of LTP at distal excitatory synapses. Our experimental and computational results indicate that HCN1 channels provide both an active shunt conductance that decreases the temporal integration of distal EPSPs and a tonic depolarizing current that increases resting inactivation of T-type and N-type voltage-gated Ca2+ channels, which contribute to the Ca2+ spikes. This dual mechanism may provide a general means by which HCN channels regulate dendritic excitability.}, author = {Tsay, David and Dudman, Joshua T. and Siegelbaum, Steven A.}, citeulike-article-id = {2265584}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.neuron.2007.11.015}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/18093528}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=18093528}, citeulike-linkout-3 = {http://www.sciencedirect.com/science/article/B6WSS-4RCWFWX-H/2/33bfd27d762baf5481e049b0f2956ddd}, day = {20}, doi = {10.1016/j.neuron.2007.11.015}, journal = {Neuron}, keywords = {ca1, calcium, dendrite, hcn, hcn1}, month = {December}, number = {6}, pages = {1076--1089}, posted-at = {2008-06-09 09:03:27}, priority = {2}, title = {HCN1 Channels Constrain Synaptically Evoked Ca2+ Spikes in Distal Dendrites of CA1 Pyramidal Neurons}, url = {http://dx.doi.org/10.1016/j.neuron.2007.11.015}, volume = {56}, year = {2007} }

TY - JOUR ID - citeulike:2265584 L3 - citeulike-article-id:2265584 N2 - Summary HCN1 hyperpolarization-activated cation channels act as an inhibitory constraint of both spatial learning and synaptic integration and long-term plasticity in the distal dendrites of hippocampal CA1 pyramidal neurons. However, as HCN1 channels provide an excitatory current, the mechanism of their inhibitory action remains unclear. Here we report that HCN1 channels also constrain CA1 distal dendritic Ca2+ spikes, which have been implicated in the induction of LTP at distal excitatory synapses. Our experimental and computational results indicate that HCN1 channels provide both an active shunt conductance that decreases the temporal integration of distal EPSPs and a tonic depolarizing current that increases resting inactivation of T-type and N-type voltage-gated Ca2+ channels, which contribute to the Ca2+ spikes. This dual mechanism may provide a general means by which HCN channels regulate dendritic excitability. IS - 6 JF - Neuron EP - 1089 TI - HCN1 Channels Constrain Synaptically Evoked Ca2+ Spikes in Distal Dendrites of CA1 Pyramidal Neurons VL - 56 SP - 1076 KW - ca1 KW - calcium KW - dendrite KW - hcn KW - hcn1 AU - Tsay, David AU - Dudman, Joshua AU - Siegelbaum, Steven PY - 2007/12/20/ UR - http://dx.doi.org/10.1016/j.neuron.2007.11.015 ER -