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Endocrinology, Vol 133, 600-607, Copyright © 1993 by Endocrine Society

ARTICLES

Characterization of glucose transporter isoforms in the adult and developing human eye

GJ Mantych, GS Hageman and SU Devaskar
Division of Neonatology, St. Louis University School of Medicine, Missouri.

The expression of glucose transporter isoforms (Glut 1, Glut 3, Glut 4, and Glut 5) in the human eye was investigated at various ages ranging between 8 weeks gestation (first trimester) and adult using Western blot and immunohistochemical analyses. Glut 1 and Glut 3 expression and cellular localization patterns were similar to those of human brain. Glut 1 (50-kilodalton protein) was expressed by epithelial cells (retinal pigmented epithelium, choroidal, iridial, and pars planus), which form the blood-eye barrier, retinal Mueller cells, the lens fiber cells, iridial microvascular endothelial cells, and to a lesser extent by the outer segments of the photoreceptor cells in the adult eye. This pattern was conserved throughout development and was evident as early as 8 weeks gestation. In addition, the endothelial cells of vitreous hyaloid vessels expressed Glut 1 at 8 weeks gestation. Glut 3 (50 to 55- kilodalton protein) immunoreactivity was observed only in the adult inner synaptic layer of the retina. Neither Glut 4 nor Glut 5 was expressed in any occular tissue at any age examined. These results suggest that Glut 1 is the main glucose transporter of the human eye and that it is ontogenically conserved. In contrast, Glut 3 is associated with selective neuronal processes, and its expression is developmentally altered.


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