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Related Experiment Videos

AMPA receptor function is altered in GLUR2-deficient mice.

S C Harvey1, A Köster, H Yu

  • 1Neuroscience Discovery, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285-0510, USA.

Journal of Molecular Neuroscience : MN
|October 23, 2001
PubMed
Summary
This summary is machine-generated.

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Mice lacking the GluR2 subunit of alpha-amino-3-hydroxy-5-methyl-4-isoxazoleproprionic acid (AMPA) receptors survive due to slower recovery from desensitization. This mechanism reduces calcium influx, preventing toxicity in these GluR2 (-/-) mice.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • The GluR2 subunit of AMPA receptors is critical for controlling calcium permeability and receptor biophysics.
  • Genetic manipulation preventing GluR2 editing leads to early mortality from calcium toxicity, while gene disruption is not lethal.

Purpose of the Study:

  • To investigate the mechanisms enabling survival in GluR2 (-/-) mice with highly calcium-permeable AMPA receptors.
  • To understand how these mice tolerate increased calcium influx.

Main Methods:

  • Whole-cell patch-clamp recordings were used to analyze AMPA receptor function in cortical pyramidal cells.
  • Analysis focused on the kinetics of receptor desensitization and recovery.
  • RNA editing and alternative splicing of related subunits were examined.

Related Experiment Videos

Main Results:

  • AMPA receptors in GluR2 (-/-) mice exhibited significantly slower recovery from desensitization (109.8 ms) compared to wild-type mice (54.4 ms).
  • This slower recovery is predicted to decrease calcium influx during neuronal activity.
  • No significant changes in RNA editing or alternative splicing of GluR1, 3, or 4 subunits were observed.

Conclusions:

  • Slower recovery from desensitization is a key factor contributing to the survival of GluR2 (-/-) mice.
  • This adaptation mitigates the potentially toxic effects of enhanced calcium permeability through AMPA receptors.