Journal
JOURNAL OF NEUROSCIENCE
Volume 24, Issue 29, Pages 6621-6628Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1474-04.2004
Keywords
retina; On bipolar cell; G-protein-coupled receptor; cGK; mGluR6; PKG
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Funding
- NEI NIH HHS [R01 EY010254-10, R01 EY010254] Funding Source: Medline
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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.
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