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Role of guanylyl cyclase modulation in mouse cone phototransduction.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sakurai, Keisuke Chen, Jeannie Kefalov, Vladimir J. |
| Copyright Year | 2011 |
| Abstract | A negative phototransduction feedback in rods and cones is critical for the timely termination of their light responses and for extending their function to a wide range of light intensities. The calcium feedback mechanisms that modulate phototransduction in rods have been studied extensively. However, the corresponding modulation mechanisms that enable cones to terminate rapidly their light responses and to adapt in bright light, properties critical for our daytime vision, are still not understood. In cones, calcium feedback to guanylyl cyclase is potentially a key step in phototransduction modulation. The guanylyl cyclase activity is modulated by the calcium-binding guanylyl cyclase activating proteins (GCAP1 and GCAP2). Here, we used single-cell and transretinal recordings from mouse to determine how GCAPs modulate dark-adapted responses as well as light adaptation in mammalian cones. Deletion of GCAPs increased threefold the amplitude and dramatically prolonged the light responses in dark-adapted mouse cones. It also reduced the operating range of mouse cones in background illumination and severely impaired their light adaptation. Thus, GCAPs exert powerful modulation on the mammalian cone phototransduction cascade and play an important role in setting the functional properties of cones in darkness and during light adaptation. Surprisingly, despite their better adaptation capacity and wider calcium dynamic range, mammalian cones were modulated by GCAPs to a lesser extent than mammalian rods. We conclude that a disparity in the strength of GCAP modulation cannot explain the differences in the dark-adapted properties or in the operating ranges of mammalian rods and cones. |
| Starting Page | 7991 |
| Ending Page | 8000 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.jneurosci.org/content/jneuro/31/22/7991.full.pdf |
| PubMed reference number | 21632921v1 |
| Alternate Webpage(s) | https://doi.org/10.1523/JNEUROSCI.6650-10.2011 |
| DOI | 10.1523/jneurosci.6650-10.2011 |
| Journal | The Journal of neuroscience : the official journal of the Society for Neuroscience |
| Volume Number | 31 |
| Issue Number | 22 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | ALPPL2 gene Acclimatization Calcium Cascade Device Component Dynamic Range Guanylate Cyclase-Activating Proteins Immunoglobulin lambda-Chains Light Adaptation Light Signal Transduction Mammals Photoreceptor Cells, Vertebrate Retinal Cone Rod Photoreceptors guanylate cyclase activity physical hard work |
| Content Type | Text |
| Resource Type | Article |
