Details

Autor(en) / Beteiligte

• Kanda, Hirosato
• Ling, Jennifer
• Tonomura, Sotatsu
• Noguchi, Koichi
• Matalon, Sadis
• Gu, Jianguo G.

Titel

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

Ist Teil von

• Neuron (Cambridge, Mass.), 2019-12, Vol.104 (5), p.960-971.e7

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2019

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• 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 permit high-speed and high-frequency AP conduction along the myelinated afferent nerves, and loss of function of these channels at NRs retards nerve conduction and impairs sensory behavioral responses in animals. [Display omitted] •TREK-1 and TRAAK are clustered at nodes of Ranvier of myelinated afferent nerves•They are required for rapid action potential (AP) regeneration at nodes of Ranvier•They permit high-speed and high-frequency AP conduction on afferent nerves•Suppressing these channels retards nerve conduction and impairs sensory functions Kanda et al. studied ion channels at the nodes of Ranvier (NRs) on rat myelinated afferent nerves. They discovered that thermally sensitive K2P channels, including TREK-1 and TRAAK, are clustered at NRs to secure high-speed and high-frequency nerve conduction.