Optical Control of a Delayed Rectifier and a Two-Pore Potassium Channel with a Photoswitchable Bupivacaine

ACS Chem Neurosci. 2018 Dec 19;9(12):2886-2891. doi: 10.1021/acschemneuro.8b00279. Epub 2018 Aug 14.

Abstract

Photoswitchable blockers of potassium channels can be used to optically control neuronal excitability and hold great promise for vision restoration. Here, we report a series of improved photoswitchable blockers that are furnished with a new pharmacophore based on the local anesthetic bupivacaine. These azobupivacaines (ABs) enable optical control over the delayed rectifier channel Kv2.1. and target the two-pore domain potassium channel TREK-1. For the first time, we have identified a compound that blocks conductance in the dark and potentiates it upon illumination. Using light as a trigger, ABs efficiently and reversibly silence action potential firing of hippocampal neurons in acute mouse brain slices.

Keywords: Kv2.1; Photochromic ligand; TREK-1; channel blocker; local anesthetics; photopharmacology.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Action Potentials / drug effects*
  • Animals
  • Azo Compounds / chemical synthesis
  • Azo Compounds / pharmacology*
  • Bupivacaine / analogs & derivatives*
  • HEK293 Cells
  • Hippocampus / cytology
  • Hippocampus / drug effects
  • Hippocampus / metabolism
  • Humans
  • Light*
  • Mice
  • Neurons / drug effects*
  • Neurons / metabolism
  • Optical Phenomena
  • Potassium Channel Blockers / chemical synthesis
  • Potassium Channel Blockers / pharmacology*
  • Potassium Channels, Tandem Pore Domain / antagonists & inhibitors
  • Potassium Channels, Tandem Pore Domain / drug effects*
  • Potassium Channels, Tandem Pore Domain / metabolism
  • Shab Potassium Channels / antagonists & inhibitors
  • Shab Potassium Channels / drug effects*
  • Shab Potassium Channels / metabolism

Substances

  • Azo Compounds
  • Potassium Channel Blockers
  • Potassium Channels, Tandem Pore Domain
  • Shab Potassium Channels
  • potassium channel protein TREK-1
  • Bupivacaine