TREK-1 and TRAAK Are Principal K⁺ Channels at the Nodes of Ranvier for Rapid Action Potential Conduction on Mammalian Myelinated Afferent Nerves.

ABSTRACT: Rapid conduction of nerve impulses is critical in life and relies on action potential (AP) leaps through the nodes of Ranvier (NRs) along myelinated nerves. While NRs are the only sites where APs can be regenerated during nerve conduction on myelinated nerves, ion channel mechanisms underlying the regeneration and conduction of APs at mammalian NRs remain incompletely understood. Here, we show that TREK-1 and TRAAK, the thermosensitive and mechanosensitive two-pore-domain potassium (K2P) channels, are clustered at NRs of rat trigeminal Aβ-afferent nerves with a density over 3,000-fold higher than that on their somas. These K2P channels, but not voltage-gated K⁺ channels as in other parts of nerves, are required for rapid AP repolarization at the NRs. Furthermore, these channels

SUBMITTER: Kanda H 

PROVIDER: S-EPMC6895425 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature