Inner and outer retinal mechanisms engaged by epiretinal stimulation in normal and rd mice

Eyal Margalit, Norbert Babai, Jianmin Luo, Wallace B Thoreson

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Retinal prosthetic devices are being developed to bypass degenerated retinal photoreceptors by directly activating retinal neurons with electrical stimulation. However, the retinal circuitry that is activated by epiretinal stimulation is not well characterized. Whole-cell patch clamp recordings were obtained from ganglion cells in normal and rd mice using flat-mount and retinal slice preparations. A stimulating electrode was positioned along the ganglion cell side of the preparation at different distances from the stimulated tissue. Pulses of cathodic current evoked action potentials in ganglion cells and less frequently evoked sustained inward currents that appeared synaptic in origin. Sustained currents reversed around ECl and were inhibited by blockade of α-amino-3-hydroxyl-5-methyl-4-isoxazole-proprionate (AMPA)-type glutamate receptors with 2,3-dihydroxy-6-nitro-sulfamoyl-benzo(f)-quinoxaline-2,3-dione (NBQX), γ aminobutyric acid a/c (GABAa/c) receptors with picrotoxinin, or glycine receptors with strychnine. This suggests that epiretinal stimulation activates glutamate release from bipolar cell terminals, which in turn evokes release of GABA and glycine from amacrine cells. Synaptic current thresholds were lower in ON ganglion cells than OFF cells, but the modest difference did not attain statistical significance. Synaptic currents were rarely observed in rd mice lacking photoreceptors compared to normal retina. In addition, confocal calcium imaging experiments in normal mice retina slices revealed that epiretinal stimulation evoked calcium increases in the outer plexiform layer. These results imply a contribution from photoreceptor inputs to the synaptic currents observed in ganglion cells. The paucity of synaptic responses in rd mice retina slices suggests that it is better to target retinal ganglion cells directly rather than to attempt to engage the inner retinal circuitry.

Original languageEnglish (US)
Pages (from-to)145-154
Number of pages10
JournalVisual Neuroscience
Volume28
Issue number2
DOIs
StatePublished - Mar 1 2011

Fingerprint

Ganglia
Retina
Calcium
Aminobutyrates
Isoxazoles
Retinal Neurons
Glycine Receptors
Amacrine Cells
Strychnine
Vertebrate Photoreceptor Cells
AMPA Receptors
Retinal Ganglion Cells
Glutamate Receptors
Evoked Potentials
Hydroxyl Radical
Glycine
gamma-Aminobutyric Acid
Electric Stimulation
Action Potentials
Glutamic Acid

Keywords

  • Electrical stimulation
  • Ganglion cell
  • Retina
  • Retinal prosthesis
  • rd mouse

ASJC Scopus subject areas

  • Physiology
  • Sensory Systems

Cite this

Inner and outer retinal mechanisms engaged by epiretinal stimulation in normal and rd mice. / Margalit, Eyal; Babai, Norbert; Luo, Jianmin; Thoreson, Wallace B.

In: Visual Neuroscience, Vol. 28, No. 2, 01.03.2011, p. 145-154.

Research output: Contribution to journalArticle

Margalit, Eyal ; Babai, Norbert ; Luo, Jianmin ; Thoreson, Wallace B. / Inner and outer retinal mechanisms engaged by epiretinal stimulation in normal and rd mice. In: Visual Neuroscience. 2011 ; Vol. 28, No. 2. pp. 145-154.
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