Retinal dopamine mediates multiple dimensions of light-adapted vision

Academic Article

Abstract

  • Dopamine is a key neuromodulator in the retina and brain that supports motor, cognitive, and visual function. Here, we developed a mouse model on a C57 background in which expression of the rate-limiting enzyme for dopamine synthesis, tyrosine hydroxylase, is specifically disrupted in the retina. This model enabled assessment of the overall role of retinal dopamine in vision using electrophysio-logical (electroretinogram), psychophysical (optokinetic tracking), and pharmacological techniques. Significant disruptions were ob served in high-resolution, light-adapted vision caused by specific deficits in light responses, contrast sensitivity, acuity, and circadian rhythms in this retinal dopamine-depleted mouse model. These global effects of retinal dopamine on vision are driven by the differential actions of dopamine D1 and D4 receptors on specific retinal functions and appear to be due to the ongoing bioavailability of dopamine rather than developmental effects. Together, our data indicate that dopamine is necessary for the circadian nature of light-adapted vision as well as optimal contrast detection and acuity. © 2012 the authors.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Jackson CR; Ruan GX; Aseem F; Abey J; Gamble K; Stanwood G; Palmiter RD; Iuvone PM; Mcmahon DG
  • Start Page

  • 9359
  • End Page

  • 9368
  • Volume

  • 32
  • Issue

  • 27