Abstract
Output properties of neurons are greatly shaped by voltage-gated ion channels, whose biophysical properties and localization within axodendritic compartments serve to significantly transform the original input. The hyperpolarization-activated current,Ih, is mediated by hyperpolarization-activated cyclic nucleotide-gated (HCN) channels and plays a fundamental role in influencing neuronal excitability by regulating both membrane potential and input resistance. In neurons such as cortical and hippocampal pyramidal neurons, the subcellular localization of HCN channels plays a critical functional role, yet mechanisms controlling HCN channel trafficking are not fully understood. Because ion channel function and localization are often influenced by interacting proteins, we generated a knock-out mouse lacking the HCN channel auxiliary subunit, tetratricopeptide repeat-containing Rab8b-interacting protein (TRIP8b). Eliminating expression of TRIP8b dramatically reducedIhexpression in hippocampal pyramidal neurons. Loss ofIh-dependent membrane voltage properties was attributable to reduction of HCN channels on the neuronal surface, and there was a striking disruption of the normal expression pattern of HCN channels in pyramidal neuron dendrites. In heterologous cells and neurons, absence of TRIP8b increased HCN subunit targeting to and degradation by lysosomes. Mice lacking TRIP8b demonstrated motor learning deficits and enhanced resistance to multiple tasks of behavioral despair with high predictive validity for antidepressant efficacy. We observed similar resistance to behavioral despair in distinct mutant mice lacking HCN1 or HCN2. These data demonstrate that interaction with the auxiliary subunit TRIP8b is a major mechanism underlying proper expression of HCN channels andIhin vivo, and suggest that targetingIhmay provide a novel approach to treatment of depression.
Bibliography
Lewis, A. S., Vaidya, S. P., Blaiss, C. A., Liu, Z., Stoub, T. R., Brager, D. H., Chen, X., Bender, R. A., Estep, C. M., Popov, A. B., Kang, C. E., Van Veldhoven, P. P., Bayliss, D. A., Nicholson, D. A., Powell, C. M., Johnston, D., & Chetkovich, D. M. (2011). Deletion of the Hyperpolarization-Activated Cyclic Nucleotide-Gated Channel Auxiliary Subunit TRIP8b Impairs HippocampalIhLocalization and Function and Promotes Antidepressant Behavior in Mice. The Journal of Neuroscience, 31(20), 7424â7440.
Authors
17
- Alan S. Lewis (first)
- Sachin P. Vaidya (additional)
- Cory A. Blaiss (additional)
- Zhiqiang Liu (additional)
- Travis R. Stoub (additional)
- Darrin H. Brager (additional)
- Xiangdong Chen (additional)
- Roland A. Bender (additional)
- Chad M. Estep (additional)
- Andrey B. Popov (additional)
- Catherine E. Kang (additional)
- Paul P. Van Veldhoven (additional)
- Douglas A. Bayliss (additional)
- Daniel A. Nicholson (additional)
- Craig M. Powell (additional)
- Daniel Johnston (additional)
- Dane M. Chetkovich (additional)
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Dates
Type | When |
---|---|
Created | 14 years, 3 months ago (May 18, 2011, 12:53 p.m.) |
Deposited | 2 years, 4 months ago (April 13, 2023, 4:31 p.m.) |
Indexed | 2 months, 3 weeks ago (June 14, 2025, 3:26 p.m.) |
Issued | 14 years, 3 months ago (May 18, 2011) |
Published | 14 years, 3 months ago (May 18, 2011) |
Published Online | 14 years, 3 months ago (May 18, 2011) |
Published Print | 14 years, 3 months ago (May 18, 2011) |
@article{Lewis_2011, title={Deletion of the Hyperpolarization-Activated Cyclic Nucleotide-Gated Channel Auxiliary Subunit TRIP8b Impairs HippocampalIhLocalization and Function and Promotes Antidepressant Behavior in Mice}, volume={31}, ISSN={1529-2401}, url={http://dx.doi.org/10.1523/jneurosci.0936-11.2011}, DOI={10.1523/jneurosci.0936-11.2011}, number={20}, journal={The Journal of Neuroscience}, publisher={Society for Neuroscience}, author={Lewis, Alan S. and Vaidya, Sachin P. and Blaiss, Cory A. and Liu, Zhiqiang and Stoub, Travis R. and Brager, Darrin H. and Chen, Xiangdong and Bender, Roland A. and Estep, Chad M. and Popov, Andrey B. and Kang, Catherine E. and Van Veldhoven, Paul P. and Bayliss, Douglas A. and Nicholson, Daniel A. and Powell, Craig M. and Johnston, Daniel and Chetkovich, Dane M.}, year={2011}, month=may, pages={7424–7440} }