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Fischbarg J
,
Kuang KY
,
Vera JC
,
Arant S
,
Silverstein SC
,
Loike J
,
Rosen OM
.
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Water traverses the plasma membranes of some eukaryotic cells faster than can be explained by the water permeability of their lipid bilayers. This has led to a search for a water channel. Our previous work identified glucose transporters as candidates for such a channel. We report here that Xenopus laevis oocytes injected with mRNA encoding the brain/Hep G2, adult skeletal muscle/adipocyte, or liver forms of the glucose transporter exhibit an osmotic water permeability of their plasma membranes larger than that of untreated oocytes. The osmotic water permeability component attributable to glucose transporters increased an average of 4.8-fold in the injected oocytes. These studies provide direct evidence that the facilitative, sodium-independent mammalian glucose transporters serve as membrane water channels.
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