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  Neuronal toxicity in Caenorhabditis elegans from an editing site mutant in glutamate receptor channels.

Aronoff, R., Mellem, J. E., Maricq, A. V., Sprengel, R., & Seeburg, P. H. (2004). Neuronal toxicity in Caenorhabditis elegans from an editing site mutant in glutamate receptor channels. The Journal of Neuroscience, 24(37), 8135-8140. doi:10.1523/JNEUROSCI.2587-04.2004.

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Genre: Journal Article
Alternative Title : Neuronal toxicity in Caenorhabditis elegans from an editing site mutant in glutamate receptor channels.

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JNeurosci_24_2004_8135.pdf (Any fulltext), 374KB
 
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 Creators:
Aronoff, Rachel1, Author              
Mellem, Jerry E., Author
Maricq, Andres Villu, Author
Sprengel, Rolf1, Author              
Seeburg, Peter H.1, Author              
Affiliations:
1Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Max Planck Society, ou_1497704              

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Free keywords: glutamatergic synaptic transmission; necrotic-like cell death; transgenic expression; iGluR; intracellular calcium; phenotypic rescue
 Abstract: Ionotropic glutamate receptors (iGluRs) in Caenorhabditis elegans are predicted to have high permeability for Ca2+ because of glutamine (Q) residues in the pore loop. This contrasts to the low Ca2+ permeability of similar iGluRs in principal neurons of mammals, because of an edited arginine (R) at the critical pore position in at least one channel subunit. Here, we introduced the R residue into the pore loop of a glutamate receptor subunit, GLR-2, in C. elegans. GLR-2(R) participated in channel formation, as revealed by decreased rectification of kainate-evoked currents in electrophysiological recordings when GLR-2(R) and the wild-type GLR-2(Q) were coexpressed in worms. Notably, the transgenic worms exhibited, at low penetrance, strong phenotypic impairments including uncoordination, neuronal degeneration, developmental arrest, and lethality. Penetrance of adverse phenotypes could be enhanced by transgenic expression of an optimal GLR-2(Q)/(R) ratio, implicating channel activity as the cause. In direct support, a mutation in eat-4, which prevents glutamatergic transmission, suppressed adverse phenotypes. Suppression was also achieved by mutation in calreticulin, which is necessary for maintainance of intracellular Ca2+ stores in the endoplasmic reticulum. Thus, synaptically activated GLR-2(R)-containing iGluR channels appear to trigger inappropriate, neurotoxic Ca2+ release from intracellular stores.

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Language(s): eng - English
 Dates: 2004-03-112004-07-132004-09-15
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
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Title: The Journal of Neuroscience
  Other : J. Neurosci.
Source Genre: Journal
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Publ. Info: Baltimore, MD : The Society
Pages: - Volume / Issue: 24 (37) Sequence Number: - Start / End Page: 8135 - 8140 Identifier: ISSN: 0270-6474
CoNE: https://pure.mpg.de/cone/journals/resource/954925502187