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Spatiotemporal cGMP Dynamics in Living Mouse Rods
Gross, Owen P. ; Pugh, Edward N. ; Burns, Marie E.
Biophysical journal, 2012-04, Vol.102 (8), p.1775-1784
[Periódico revisado por pares]
United States: Elsevier Inc
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Título:
Spatiotemporal cGMP Dynamics in Living Mouse Rods
Autor:
Gross, Owen P.
;
Pugh, Edward N.
;
Burns, Marie E.
Assuntos:
3',5'-Cyclic-GMP Phosphodiesterases - metabolism
;
Animals
;
Atoms & subatomic particles
;
Biophysics
;
Biosynthesis
;
calcium
;
Calcium - metabolism
;
Cellular Biophysics and Electrophysiology
;
cyclic GMP
;
Cyclic GMP - metabolism
;
Darkness
;
Diffusion
;
diffusivity
;
electrodes
;
Guanylate Cyclase-Activating Proteins - metabolism
;
hydrolysis
;
Ion Channel Gating - radiation effects
;
Ion Channels - metabolism
;
Kinetics
;
Light Signal Transduction - radiation effects
;
Membranes
;
Mice
;
Models, Biological
;
phototransduction
;
plasma membrane
;
Retinal Rod Photoreceptor Cells - cytology
;
Retinal Rod Photoreceptor Cells - metabolism
;
Retinal Rod Photoreceptor Cells - radiation effects
;
Rodents
;
rods (retina)
;
Signal transduction
;
Time Factors
É parte de:
Biophysical journal, 2012-04, Vol.102 (8), p.1775-1784
Notas:
http://dx.doi.org/10.1016/j.bpj.2012.03.035
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição:
Signaling of single photons in rod photoreceptors decreases the concentration of the second messenger, cyclic GMP (cGMP), causing closure of cGMP-sensitive channels located in the plasma membrane. Whether the spatiotemporal profiles of the fall in cGMP are narrow and deep, or broad and shallow, has important consequences for the amplification and the fidelity of signaling. The factors that determine the cGMP profiles include the diffusion coefficient for cGMP, the spontaneous rate of cGMP hydrolysis, and the rate of cGMP synthesis, which is powerfully regulated by calcium feedback mechanisms. Here, using suction electrodes to record light-dependent changes in cGMP-activated current in living mouse rods lacking calcium feedback, we have determined the rate constant of spontaneous cGMP hydrolysis and the longitudinal cGMP diffusion coefficient. These measurements result in a fully constrained spatiotemporal model of phototransduction, which we used to determine the effect of feedback to cGMP synthesis in spatially constricting the fall of cGMP during the single-photon response of normal rods. We find that the spatiotemporal cGMP profiles during the single-photon response are optimized for maximal amplification and preservation of signal linearity, effectively operating within an axial signaling domain of ∼2 μm.
Editor:
United States: Elsevier Inc
Idioma:
Inglês
Links
View this record in MEDLINE/PubMed
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