β-ionone activates and bleaches visual pigment in salamander photoreceptors
نویسندگان
چکیده
منابع مشابه
Bleached pigment activates transduction in salamander cones
We have used suction electrode recording together with rapid steps into 0.5 mM IBMX solution to investigate changes in guanylyl cyclase velocity produced by pigment bleaching in isolated cones of the salamander Ambystoma tigrinum. Both backgrounds and bleaches accelerate the time course of current increase during steps into IBMX. We interpret this as evidence that the velocity of the guanylyl c...
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Rods and cones contain closely related but distinct G protein-coupled receptors, opsins, which have diverged to meet the differing requirements of night and day vision. Here, we provide evidence for an exception to that rule. Results from immunohistochemistry, spectrophotometry, and single-cell RT-PCR demonstrate that, in the tiger salamander, the green rods and blue-sensitive cones contain the...
متن کاملVisual Pigment Bleaching in Isolated Salamander Retinal Cones
A B ST RACT Visual pigment bleaching desensitizes rod photoreceptors greatly in excess of that due to loss of quantum catch. Whether this phenomenon also occurs in cone photoreceptors was investigated for isolated salamander red-sensitive cones. In parallel experiments, (a) visual pigment depletion by steps of bleaching light was measured by microspectrophotometry, and (b) flash sensitivity was...
متن کاملLight adaptation in salamander L-cone photoreceptors.
The responses of individual salamander L-cones to light steps of moderate intensity (bleaching 0.3-3% of the total photopigment) and duration (between 5 and 90 s) were recorded using suction electrodes. Light initially suppressed the circulating current, which partially recovered or "sagged" over several seconds. The sensitivity of the cone to dim flashes decreased rapidly after light onset and...
متن کاملVisual pigment bleaching in isolated salamander retinal cones. Microspectrophotometry and light adaptation
Visual pigment bleaching desensitizes rod photoreceptors greatly in excess of that due to loss of quantum catch. Whether this phenomenon also occurs in cone photoreceptors was investigated for isolated salamander red-sensitive cones. In parallel experiments, (a) visual pigment depletion by steps of bleaching light was measured by microspectrophotometry, and (b) flash sensitivity was measured by...
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ژورنال
عنوان ژورنال: Visual Neuroscience
سال: 2009
ISSN: 0952-5238,1469-8714
DOI: 10.1017/s0952523809090105