cGMP-dependent kinase regulates response sensitivity of the mouse on bipolar cell

Josefin Snellman, Scott Nawy

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


The visual system can adjust its sensitivity over a wide range of light intensities. Photoreceptors account for some of this adjustment, but there is evidence that postreceptoral processes also exist. To investigate the latter, we pharmacologically mimicked the effects of light stimulation on mouse On bipolar cells, thus avoiding confounding effects of receptoral mechanisms. Here, we report that cGMP selectively enhances responses to dim, but not bright, stimuli through a purely postsynaptic mechanism. This action of cGMP was completely blocked by inhibitors of cGMP-dependent kinase. We propose that cGMP-dependent kinase decreases coupling of the On bipolar cell glutamate receptor to the downstream cascade, thus amplifying small decreases in photoreceptor transmitter levels that would otherwise go undetected by the visual system.

Original languageEnglish (US)
Pages (from-to)6621-6628
Number of pages8
JournalJournal of Neuroscience
Issue number29
StatePublished - Jul 21 2004
Externally publishedYes


  • CGK
  • G-protein-coupled receptor
  • MGluR6
  • On bipolar cell
  • PKG
  • Retina

ASJC Scopus subject areas

  • General Neuroscience


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