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Related Experiment Video

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Functional Evaluation of Biological Neurotoxins in Networked Cultures of Stem Cell-derived Central Nervous System Neurons
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Intersubunit interactions between mutant DEG/ENaCs induce synthetic neurotoxicity.

W Zhang1, L Bianchi, W-H Lee

  • 1Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, NJ 08854, USA.

Cell Death and Differentiation
|August 2, 2008
PubMed
Summary
This summary is machine-generated.

Neuronal death from ion channel hyperactivation can be worsened by specific mutations. A novel mutation, MEC-4(A149V), synergizes with MEC-10(d) to enhance neurotoxicity, highlighting calcium

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Published on: August 18, 2008

Area of Science:

  • Neuroscience
  • Ion Channel Biology
  • Molecular Genetics

Background:

  • Ion channel hyperactivation, particularly of Degenerin/epithelial amiloride-sensitive Na(+) channels (DEG/ENaC), contributes to neuronal loss in conditions like stroke and neurodegenerative diseases.
  • Acidosis-induced hyperactivation of ASIC1a in the mammalian brain and genetic hyperactivation of the C. elegans MEC-4(d) channel exemplify DEG/ENaC-mediated neurotoxicity.
  • Mutant MEC-10(d) subunits show weak neurotoxicity, providing a basis for screening for mutations that enhance neuronal death.

Purpose of the Study:

  • To identify novel extragenic mutations that enhance neuronal necrosis in Caenorhabditis elegans.
  • To characterize the mechanism by which identified mutations contribute to neurotoxicity within the DEG/ENaC channel superfamily.
  • To investigate the role of specific ion currents, particularly Ca(2+), in mediating DEG/ENaC-induced neuronal death.

Main Methods:

  • Genetic screening of Caenorhabditis elegans mec-10(d) mutant lines to identify enhancers of neuronal necrosis.
  • Characterization of the identified enhancer mutation, MEC-4(A149V), for its effects on touch sensation and neurotoxicity.
  • Functional analysis of the MEC-4(A149V) and MEC-10(d) combined channel in Xenopus oocytes to measure ion currents (Na(+) and Ca(2+)) and amiloride binding.

Main Results:

  • A novel variant, MEC-4(A149V), was identified as a potent enhancer of mec-10(d)-induced neuronal necrosis.
  • MEC-4(A149V) alone does not cause necrosis but synergizes with MEC-10(d) to form a strongly neurotoxic channel.
  • The combined MEC-4(A149V)+MEC-10(d) channel exhibits increased Na(+) and Ca(2+) currents, with a disproportionate rise in Ca(2+) permeability, and altered amiloride binding.

Conclusions:

  • This study reports the first instance of synergistically toxic intersubunit interactions within the DEG/ENaC channel class.
  • The findings suggest that elevated Ca(2+) influx through DEG/ENaC channels may be a critical determinant of neuronal survival versus necrosis.
  • MEC-4(A149V) represents a valuable tool for studying the mechanisms underlying DEG/ENaC channel-mediated neurotoxicity and potential therapeutic targets.