Abstract
Voltage-gated ion channels are critical for neuronal integration. Some of these channels, however, are misregulated in several neurological disorders, causing both gain- and loss-of-function channelopathies in neurons. Using several transgenic mouse models of Alzheimer's disease (AD), we find that sub-threshold voltage signals strongly influenced by hyperpolarization-activated, cyclic nucleotide-gated (HCN) channels progressively deteriorate over chronological aging in hippocampal CA1 pyramidal neurons. The degraded signaling via HCN channels in the transgenic mice is accompanied by an age-related global loss of their non-uniform dendritic expression. Both the aberrant signaling via HCN channels and their mislocalization could be restored using a variety of pharmacological agents that target the endoplasmic reticulum (ER). Our rescue of the HCN channelopathy helps provide molecular details into the favorable outcomes of ER-targeting drugs on the pathogenesis and synaptic/cognitive deficits in AD mouse models, and implies that they might have beneficial effects on neurological disorders linked to HCN channelopathies.
Original language | English (US) |
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Pages (from-to) | 141-157 |
Number of pages | 17 |
Journal | Neurobiology of Learning and Memory |
Volume | 154 |
DOIs | |
State | Published - Oct 2018 |
Funding
We thank Dr. Elliott Mufson and Dr. Sylvia Perez for generous provision of 3×Tg mice and help with amyloid staining. This research was funded by National Institute on Aging grants AG031574 , AG047073 , and AG050767 (to D.A.N.) and AG017139 (to D.A.N. and J.F.D.), and the Charles and M.R. Shapiro Foundation (to D.A.N.).
Keywords
- Array tomography
- Carvedilol
- Electron microscopy
- Endoplasmic reticulum
- HCN channel
- Patch-clamp
- TRIP8b
ASJC Scopus subject areas
- Experimental and Cognitive Psychology
- Cognitive Neuroscience
- Behavioral Neuroscience