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  • Title: An analysis of inputs to ON-OFF amacrine cells in the carp retina with kynurenic acid.
    Author: Fujimoto M, Toyoda J.
    Journal: Neuroreport; 1991 Jun; 2(6):317-20. PubMed ID: 1655105.
    Abstract:
    Amacrine cell inputs were studied in the carp retina. Responses to light of bipolar and amacrine cells in off-pathways were suppressed by 0.5 mM kynurenic acid (Kyn), while those in on-pathways were not. In ON-OFF amacrine cells, the sustained potential level during illumination shifted in the depolarizing direction. The depolarizing response elicited in off-center bipolar cells by transretinal current was also suppressed, but those elicited in amacrine cells were not. The results indicated that off-pathways are selectively suppressed by 0.5 mM Kyn at the level of receptor-bipolar synapses and demonstrated that sustained levels of ON-OFF amacrine responses are determined by a balance of inputs from on- and off-center bipolar cells.
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