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Receptive-field properties of displaced starburst amacrine cells change following axotomy-induced degeneration of ganglion cells

Published online by Cambridge University Press:  02 June 2009

Ralph J. Jensen
Ralph J. Jensen
Affiliation:
Department of Biomedical Sciences, Southern College of Optometry, Memphis
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Abstract

Starburst amacrine cells in the rabbit retina were labeled following an intraocular injection of the fluorescent dye, 4, 6, diamidino-2-phenylindole (DAPI). From each eye a strip of retina was removed, mounted on a platform beneath an epifluorescence microscope, and superfused with a physiological solution. The tip of a tungsten microelectrode (for extracellular recording) was visually positioned near the cell body of a DAPI-labeled starburst amacrine cell that was located in the ganglion cell layer. Light-evoked responses from the displaced starburst amacrine cells were studied in normal retinas and in retinas that had received a small electrolytic lesion near the optic disk 5–9 months beforehand. In normal retinas, a small spot of light centered over the receptive field of a displaced starburst amacrine cell in nearly all cases evoked a brief burst of spikes only at light onset. When stimulated with a large spot or an annulus of light, many cells gave a small burst of spikes at light offset. In lesioned retinas, the light responses of displaced starburst amacrine cells were recorded in areas of the retina where ganglion cells had degenerated. All cells responded with a large burst of spikes at the onset and offset of a small, centered spot of light. Large spots and annuli of light also evoked robust ON/OFF responses from these cells. The results from this study show that the receptive-field properties of displaced starburst amacrine cells change following axotomy-induced degeneration of ganglion cells. This finding indicates that changes in either synaptic transmission or the membrane properties of neurons occur in the retina following degeneration of ganglion cells.

Keywords

Cholinergic amacrine cellsRabbit retinaAxotomyNeuronal plasticity
Type
Research Articles
Information
Visual Neuroscience , Volume 12 , Issue 1 , January 1995 , pp. 177 - 184
Copyright
Copyright © Cambridge University Press 1995

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