Circadian perinatal photoperiod has enduring effects on retinal dopamine and visual function

J Neurosci. 2014 Mar 26;34(13):4627-33. doi: 10.1523/JNEUROSCI.4887-13.2014.

Abstract

Visual system development depends on neural activity, driven by intrinsic and light-sensitive mechanisms. Here, we examined the effects on retinal function due to exposure to summer- and winter-like circadian light cycles during development and adulthood. Retinal light responses, visual behaviors, dopamine content, retinal morphology, and gene expression were assessed in mice reared in seasonal photoperiods consisting of light/dark cycles of 8:16, 16:8, and 12:12 h, respectively. Mice exposed to short, winter-like, light cycles showed enduring deficits in photopic retinal light responses and visual contrast sensitivity, but only transient changes were observed for scotopic measures. Dopamine levels were significantly lower in short photoperiod mice, and dopaminergic agonist treatment rescued the photopic light response deficits. Tyrosine hydroxylase and Early Growth Response factor-1 mRNA expression were reduced in short photoperiod retinas. Therefore, seasonal light cycles experienced during retinal development and maturation have lasting influence on retinal and visual function, likely through developmental programming of retinal dopamine.

Keywords: circadian; dopamine; electroretinogram; photoperiod; retina; vision.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / pharmacology
  • Animals
  • Animals, Newborn
  • Benzamides / pharmacology
  • Circadian Rhythm / physiology*
  • Contrast Sensitivity / drug effects
  • Dopamine / metabolism*
  • Dopamine Agonists / pharmacology
  • Embryo, Mammalian
  • Female
  • Gene Expression / drug effects
  • Gene Expression / radiation effects
  • Light
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Nystagmus, Optokinetic / drug effects
  • Nystagmus, Optokinetic / physiology*
  • Photoperiod*
  • Piperazines / pharmacology
  • Pregnancy
  • Retina / drug effects
  • Retina / physiology*
  • Time Factors

Substances

  • Benzamides
  • Dopamine Agonists
  • N-((4-(2-cyanophenyl)-1-piperazinyl)methyl)-3-methylbenzamide
  • Piperazines
  • 2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine
  • Dopamine