title: Early distal axonopathy of the visual pathway in experimental diabetes.
abstract: Diabetic retinopathy is a leading cause of acquired blindness. Visual function disorders have been observed in diabetic patients with very early retinopathy or even before the onset of retinopathy. The aim of the present work was to analyze the visual pathway in an early stage of experimental diabetes. Diabetes was induced in Wistar rats by an i.p. injection of streptozotocin. A deficit in anterograde transport from the retina to the superior colliculus was observed 6 weeks after streptozotocin injection. At this time point, morphologic studies did not reveal retinal ganglion cell loss or substantial alterations in the superior colliculus. The optic nerve was morphometrically evaluated at intraorbital (unmyelinated and myelinated) and intracranial sections. In animals that had been diabetic for 6 weeks, a large increase in astrocyte reactivity occurred in the distal (but not the intraorbital) portion, which coincided with significant axon loss. Moreover, profound myelin alterations and altered morphologic features of oligodendrocyte lineage were observed at the distal (but not the proximal) optic nerve portion. The present results suggest that axoglial alterations at the distal portion of the optic nerve could be the first structural change in the diabetic visual pathway.
authors.affiliation: Laboratory of Retinal Neurochemistry and Experimental Ophthalmology, Department of Human Biochemistry, School of Medicine, University of Buenos Aires/CEFyBO, CONICET, Buenos Aires, Argentina.
authors.forename: Diego C
authors.initials: DC
authors.lastname: Fernandez
authors.forename: Laura A
authors.initials: LA
authors.lastname: Pasquini
authors.forename: Damián
authors.initials: D
authors.lastname: Dorfman
authors.forename: Hernán J
authors.initials: HJ
authors.lastname: Aldana Marcos
authors.forename: Ruth E
authors.initials: RE
authors.lastname: Rosenstein
mesh_terms: D000818:Animals; D001369:Axons / Q000502:physiology* / Q000648:ultrastructure; D002452:Cell Count; D002772:Cholera Toxin; D004396:Coloring Agents; D003921:Diabetes Mellitus, Experimental / Q000473:pathology / Q000503:physiopathology*; D003929:Diabetic Neuropathies / Q000473:pathology / Q000503:physiopathology*; D003930:Diabetic Retinopathy / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D008854:Microscopy, Electron; D051381:Rats; D017208:Rats, Wistar; D012165:Retinal Ganglion Cells / Q000502:physiology / Q000648:ultrastructure; D014795:Visual Pathways / Q000502:physiology*
chemical_list: D004396:Coloring Agents; D002772:Cholera Toxin
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