April 1984
Volume 25, Issue 4
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Articles  |   April 1984
Effects of diamide on cyclic nucleotide levels in rat retina.
Investigative Ophthalmology & Visual Science April 1984, Vol.25, 461-463. doi:
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      B S Winkler, R T Fletcher, G J Chader; Effects of diamide on cyclic nucleotide levels in rat retina.. Invest. Ophthalmol. Vis. Sci. 1984;25(4):461-463.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

The concentrations of guanosine 3',5' monophosphate (cyclic GMP) and adenosine 3',5' monophosphate (cyclic AMP) were measured in rat retinas incubated under control conditions and in retinas incubated with diamide, a relatively specific glutathione oxidant. Retinas incubated with either glucose or pyruvate as the substrate for 30 min in the dark contained about 50 picomoles cyclic GMP/mg protein and 7 picomoles cyclic AMP/mg protein. Light-exposed control retinas contained about 70% less cyclic GMP (14.4 picomoles/mg protein) and 20% less cyclic AMP (5.4 picomoles/mg protein). Addition of diamide to the incubation medium at concentrations between 0.1 and 1.0 mM produced a concentration-dependent decrease in the dark level of cyclic GMP, but did not affect its concentration in the light or the concentration of cyclic AMP in dark-maintained and light-exposed retinas. The major effect of diamide was to reduce the normal dark-light difference in the concentration of cyclic GMP. Oxidizing conditions thus appear to alter selectively the light-sensitive compartment of retinal cyclic GMP.

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