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Related Experiment Videos

H(+)-gated cation channels.

R Waldmann1, G Champigny, E Lingueglia

  • 1IPMC-CNRS, Valbonne, France.

Annals of the New York Academy of Sciences
|July 22, 1999
PubMed
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New H(+)-gated cation channels, including ASIC and DRASIC, are crucial for pain perception. These channels, found in the brain and dorsal root ganglion cells, are activated by external pH changes and implicated in pain signaling.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Physiology

Background:

  • H(+)-gated cation channels are a novel class of ion channels.
  • Acid-sensing ion channels (ASICs) and their homologs like DRASIC are expressed in the nervous system.

Purpose of the Study:

  • To investigate the role of H(+)-gated cation channels, specifically ASIC and DRASIC, in pain perception.
  • To explore the function of MDEG1 and MDEG2 in relation to ASIC and DRASIC.

Main Methods:

  • Expression analysis of ASIC and DRASIC in brain and dorsal root ganglion (DRG) cells.
  • Biophysical characterization of ASIC and DRASIC channel activity.
  • Investigating the functional interactions between MDEG1, MDEG2, ASIC, and DRASIC.

Main Results:

Related Experiment Videos

  • ASIC and DRASIC are present in the brain and DRGs, respectively, and are activated by extracellular acidification.
  • ASIC exhibits rapid activation and inactivation, while DRASIC shows both fast and sustained components.
  • MDEG1 and MDEG2 modulate H(+)-gated channel activity; MDEG1 mutations cause neurodegeneration, and MDEG2 co-assembles with DRASIC in DRGs.

Conclusions:

  • H(+)-gated cation channels, particularly ASIC and DRASIC, are key players in pain perception due to their role in sensing external acidification.
  • The interaction between MDEG2 and DRASIC in DRGs suggests a significant contribution to native H(+)-gated channel function and pain signaling.