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Inhibitory glutamate receptor channels
1Biology Department 0357, UCSD, La Jolla 92093-0357, USA.
Molecular Neurobiology
|October 1, 1996
Summary
Inhibitory glutamate receptors (IGluRs) are ion channels found in invertebrates that resemble GABA receptors but are genetically similar to glycine receptors. Their unique properties explain avermectin
Area of Science:
- Neuroscience
- Molecular Biology
- Evolutionary Biology
Background:
- Inhibitory glutamate receptors (IGluRs) are ion channel proteins related to glycine and GABA receptors.
- IGluRs are gated by glutamate and permeable to chloride and potassium ions.
- They exhibit physiological and pharmacological similarities to GABA receptors but sequence similarities to glycine receptors.
Purpose of the Study:
- To investigate the characteristics and functions of IGluRs.
- To explore the potential role of IGluRs in the action of avermectins.
- To examine IGluRs as a model system for studying adaptive molecular evolution.
Main Methods:
- Analysis of amino acid sequences of cloned IGluRs.
- Pharmacological characterization using agonists like ibotenic acid and quisqualate.
- Investigation of avermectin effects on IGluRs at various concentrations.
Main Results:
- Cloned IGluRs show highest sequence similarity to glycine receptors.
- Ibotenic acid activates all IGluRs; quisqualate is a limited agonist.
- Avermectins modulate IGluRs, potentially explaining their selective toxicity.
- IGluRs are found in protostomes and pseudocoelomates, mediating inhibition in neurons and muscles.
Conclusions:
- IGluRs represent a distinct class of receptors with unique pharmacological profiles.
- Their presence and function in invertebrates may explain avermectin efficacy and safety.
- Protostome IGluRs offer a diverse system for studying receptor evolution and adaptation.