Membrane lipid modulations remove divalent open channel block from TRP-like and NMDA channels

Moshe Parnas, Ben Katz, Shaya Lev, Vered Tzarfaty, Daniela Dadon, Ariela Gordon-Shaag, Henry Metzner, Rami Yaka, Baruch Minke*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Open channel block is a process in which ions bound to the inside of a channel pore block the flow of ions through that channel. Repulsion of the blocking ions by depolarization is a known mechanism of open channel block removal. For the NMDA channel, this mechanismis necessary for channel activation and is involved in neuronal plasticity. Several types of transient receptor potential (TRP) channels, including the Drosophila TRP and TRP-like (TRPL) channels, also exhibit open channel block. Therefore, removal of open channel block is necessary for the production of the physiological response to light. Because there is no membrane depolarization before the light response develops, it is not clear how the open channel block is removed, an essential step for the production of a robust light response under physiological conditions. Here we present a novel mechanism to alleviate open channel block in the absence of depolarization by membrane lipid modulations. The results of this study show open channel block removal by membrane lipid modulations in both TRPL and NMDA channels of the photoreceptor cells and CA1 hippocampal neurons, respectively. Removal of open channel block is characterized by an increase in the passage-rate of the blocking cations through the channel pore. We propose that the profound effect of membrane lipid modulations on open channel block alleviation, allows the productions of a robust current in response to light in the absence of depolarization.

Original languageAmerican English
Pages (from-to)2371-2383
Number of pages13
JournalJournal of Neuroscience
Volume29
Issue number8
DOIs
StatePublished - 25 Feb 2009

Keywords

  • Drosophila
  • NMDA channel
  • Open channel block
  • Phospholipase C
  • Photoreceptors
  • TRP channels

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