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J Neurophysiol 83: 1817-1829, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 83 No. 4 April 2000, pp. 1817-1829
Copyright ©2000 by the American Physiological Society

Light-Evoked Responses of Bipolar Cells in a Mammalian Retina

Thomas Euler and Richard H. Masland

Howard Hughes Medical Institute, Massachusetts General Hospital, Boston, Massachussetts 02114

Euler, Thomas and Richard H. Masland. Light-Evoked Responses of Bipolar Cells in a Mammalian Retina. J. Neurophysiol. 83: 1817-1829, 2000. We recorded light-evoked responses from rod and cone bipolar cells using patch-clamp techniques in a slice preparation of the rat retina. Rod bipolar cells responded to light with a sustained depolarization (ON response) followed at light offset by a slight hyperpolarization. ON and OFF cone bipolar cells were encountered, both with diverse temporal properties. The responses of rod bipolar cells were composed primarily of two components, a nonspecific cation current and a chloride current. The chloride current was reduced greatly in axotomized cells and could be suppressed by coapplication of the GABAA antagonist bicuculline and the GABAC antagonist (1,2,5,6-tetrahydropyridine-4-yl)methylphosphinic acid. This suggests that it largely reflects feedback from GABAergic amacrine cells. The response latency of intact rod bipolar cells was shorter than that of the axotomized cells, and the sensitivity curve covered more than twice the dynamic range. Application of the GABA receptor antagonists partially mimicked the effects of axotomy. These findings suggest that functional properties of the axon terminal system---notably synaptic feedback from amacrine cells---play an important role in defining the response properties of mammalian bipolar cells.




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