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Functional diversity and developmental changes in rat neuronal kainate receptors
1Department of Cell Biology and Physiology, Washington University School of Medicine, St Louis, MO 63110, USA.
The Journal of Physiology
|April 18, 2001
Summary
Kainate receptors in different neurons show distinct physiological properties. ATPA responses varied significantly, highlighting functional differences and diverse roles in synaptic transmission.
Area of Science:
- Neuroscience
- Molecular Biology
Background:
- Kainate receptors are ionotropic glutamate receptors involved in synaptic transmission.
- Neuronal kainate receptors exhibit diverse physiological and pharmacological properties.
Purpose of the Study:
- To compare the physiological properties of kainate receptors in rat hippocampal, spinal cord, and dorsal root ganglia (DRG) neurons.
- To investigate the functional differences in responses to kainate and the GluR5-selective agonist ATPA.
Main Methods:
- Whole-cell patch-clamp electrophysiology was used to record currents.
- Neurons from rat hippocampus, spinal cord, and DRG were stimulated with kainate and ATPA.
- Desensitization and activation kinetics were analyzed.
Main Results:
- Kainate evoked similar desensitizing currents across all cell types.
- ATPA responses varied: significant steady-state currents in hippocampus, rapid decay in DRG, and minimal response in spinal neurons.
- DRG kainate receptors showed slower recovery from ATPA-induced desensitization compared to hippocampal receptors.
- EC50 values for ATPA differed between hippocampal and DRG neurons.
Conclusions:
- Neuronal kainate receptors display significant functional heterogeneity.
- These differences likely stem from distinct subunit compositions.
- This heterogeneity underlies the diverse roles of kainate receptors in synaptic transmission.
