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Glutamate receptor subtypes in human retinal horizontal cells
Wen Shen1, Sarah G Finnegan, Malcolm M Slaughter
1Department of Physiology and Biophysics, University at Buffalo, Buffalo, NY 14214, USA.
Visual Neuroscience
|May 13, 2004
Summary
Human retinal horizontal cells have both AMPA and kainate glutamate receptors, influencing synaptic signaling. These receptors exhibit distinct desensitization properties, suggesting multiplexed synaptic input in the human retina.
Area of Science:
- Neuroscience
- Ophthalmology
- Molecular Biology
Background:
- Horizontal cells are crucial for retinal signal processing.
- Glutamate receptors mediate synaptic transmission in the retina.
- Understanding receptor subtypes in human retina is vital for visual neuroscience.
Purpose of the Study:
- To characterize glutamate receptor currents in human retinal horizontal cells.
- To investigate the properties of AMPA and kainate receptors in this cell type.
- To determine the receptor variants present and their functional implications.
Main Methods:
- Whole-cell recording techniques were employed on cultured human retinal horizontal cells.
- AMPA and kainate receptor activation and desensitization were analyzed.
- Pharmacological agents like cyclothiazide, PEPA, and GYKI-52466 were used to probe receptor function.
Main Results:
- Human horizontal cells express both AMPA and kainate receptors, generating sustained currents.
- Kainate currents showed minimal desensitization, while AMPA currents desensitized significantly.
- AMPA receptors exhibited the 'flip' variant, indicated by cyclothiazide enhancement.
- GYKI-52466 non-selectively blocked both AMPA and kainate responses.
Conclusions:
- Human retinal horizontal cells possess a diverse complement of glutamate receptors.
- Differential desensitization of AMPA and kainate receptors impacts signal processing.
- Synaptic input to human horizontal cells is likely multiplexed via distinct glutamate receptor channels.