Document Type
Article
Publication Date
12-31-2024
Abstract
Use-dependent spike broadening (UDSB) results from inactivation of the voltage-gated K+ (Kv) channels that regulate the repolarization of the action potential. However, the specific signaling and molecular processes that modulate UDSB have remained elusive. Here, we applied an adeno-associated viral vector approach and dynamic clamping to conclusively demonstrate how multisite phosphorylation of the N-terminal inactivation domain (NTID) of the Kv3.4 channel modulates UDSB in rat dorsal root ganglion (DRG) neurons. The Kv3.4 phosphonull variant promotes slow recovery from inactivation, cumulative inactivation, and UDSB. In contrast, the Kv3.4 phosphomimic variant promotes fast recovery from inactivation and robust resistance to cumulative inactivation and UDSB. Furthermore, knocking down Kv3.4 maximizes AP width and eliminates UDSB modulation. Together with the evidence from previous work, the results concretely suggest how dynamic UDSB modulation governed by multisite phosphorylation of the NTID of Kv3.4 in DRG neurons may play a significant role in mechanosensory transduction and pain modulation.
Recommended Citation
Alexander, Tyler D.; Tymanskyj, Stephen; Kennedy, Kyle J.; Kaczmarek, Leonard K.; and Covarrubias, Manuel, "Molecular Mechanism Governing the Plasticity of Use-Dependent Spike Broadening in Dorsal Root Ganglion Neurons" (2024). SKMC Student Presentations and Publications. Paper 37.
https://jdc.jefferson.edu/skmcstudentworks/37
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Language
English
Comments
This article is the author's final published version in Proceedings of the National Academy of Sciences of the United States of America, Volume 122, Issue 1, December 2024, Article number e2411033121.
The published version is available at https://doi.org/10.1073/pnas.2411033121.
Copyright © 2024 The Author(s).