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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1982 Mar;79(6):2111–2115. doi: 10.1073/pnas.79.6.2111

Fluid transport across retinal pigment epithelium is inhibited by cyclic AMP.

S S Miller, B A Hughes, T E Machen
PMCID: PMC346133  PMID: 6177005

Abstract

Fluid transport across the retinal pigment epithelium (bullfrog) has been measured. These experiments were carried out by using a capacitance probe technique and a water-impermeable chamber that allowed the measurements to be made with an accuracy of 0.5-1.0 nl/min. With identical Ringer's solution on both sides of the epithelium, and in the absence of a hydrostatic driving force, the direction of net fluid movement is from the retina to the choroid (absorption). The net transport rate, approximately 10 nl/min (4.8 microliters/cm2 . hr), is comparable to that observed in other amphibian epithelia. It is reduced to zero by the mitochondrial uncoupler 2,4-dinitrophenol but is relatively unaffected by ouabain, which inhibits the Na+/K+-pump located on the apical membrane of this epithelium. A significant decrease in net fluid absorption was produced by dibutyryl cAMP and 3-isobutyl-1-methylxanthine (a potent phosphodiesterase inhibitor). This cAMP-dependent fluid transport may be an important mechanism for controlling the fluid volume in the subretinal space.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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