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Short-term effects of dopamine on photoreceptors, luminosity- and chromaticity-horizontal cells in the turtle retina

  • Josef Ammermüller (a1), Reto Weiler (a1) and Ido Perlman (a2)
Abstract
Abstract

The effects of dopamine on luminosity-type horizontal cells have been documented in different vertebrate retinas, both in vivo and in vitro. Some of these effects may reflect direct action of dopamine onto these cells, but indirect effects mediated by presynaptic neurons cannot be ruled out. Furthermore, direct effects of dopamine on horizontal cells may affect other, postsynaptic neurons in the outer plexiform layer. To test these possibilities, we studied the effects of dopamine on photoreceptors and all types of horizontal cells in the turtle (Pseudemys scripta elegans) retina. Receptive-field properties, responsiveness to light, and time course of light responses were monitored with intracellular recordings. Dopamine at a concentration of 40 μM exerted effects with two different time courses. “Short-term” effects were fully developed after 3 min of dopamine application and reversed within 30 min of washout of the drug. “Long-term” effects were fully developed after about 7–10 min and could not be washed out during the course of our experiments. Only the “short-term” effects were studied in detail in this paper. These were expressed in a reduction of the receptive-field size of all types of horizontal cells studied; L1 and L2 luminosity types as well as Red/Green and Yellow/Blue chromaticity types. The L1 horizontal cells did not exhibit signs of reduced responsiveness to light under dopamine, while in the L2 cells and the two types of chromaticity cells responsiveness decreased. None of the rods, long-wavelength-sensitive, or medium-wavelength-sensitive cones exhibited any apparent reduction in their receptive-field sizes or responsiveness to light. The present results suggest that the “short-term” effects of dopamine are not mediated by photoreceptors and are probably due to direct action of dopamine on horizontal cells.

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Visual Neuroscience
  • ISSN: 0952-5238
  • EISSN: 1469-8714
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