| Fenestrations and preferential flow routes in the prelaminar optic nerve through wet scanning electron microscope and perfusion of tracers. | |
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MedLine Citation:
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PMID: 20497430 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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PURPOSE: We study the vitreous interface of the optic disc to delimit the passages for the flow of fluids through the prelaminar tissue of porcine eyes. METHODS: Wet scanning electron microscope (SEM), conventional SEM and transmission electron microscope (TEM) were used to explore the surface of the optic nerve of the pig. The vitreous cavity was perfused with a fluorescent marker and colloidal gold at controlled pressure. Samples of perfused optic nerve head were cryosectioned and observed with the confocal laser microscope (lectin) or resin embedded and observed under TEM (gold). RESULTS: Fenestrations were present under the SEM in all three regions of the vitreous interface. SEM results were confirmed at the TEM level and under the wet-SEM. Perfusion experiments traced the flow of a fluorescent molecule delineating routes of preferential flow with origin in the fenestrations. Colloidal gold marked the site of entrance in the prelaminar tissue identifying major fenestrations in the basal membrane. CONCLUSIONS: Interchange of fluid between the optic nerve and the vitreous cavity in the pig is facilitated by fenestrations of varied sizes in the basal membrane and preferential flow routes through the prelaminar tissue. Preferential flow routes exist in the extracellular spaces of Elschnig and Kuhn' astrocytes and give a sharply distinct image when compared with flow through zones in which astrocytes envelope axons. Escape routes may be instrumental in preventing oedemas of the optic nerve head, but they could also serve as entrance doors for fluids from the vitreous and aqueous and play a pathogenic role in ageing and glaucoma. |
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Authors:
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F Javier Carreras; David Porcel; Isabel Guerra-Tschuschke; Ignacio Carreras |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-09 |
Journal Detail:
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Title: Clinical & experimental ophthalmology Volume: 38 ISSN: 1442-9071 ISO Abbreviation: Clin. Experiment. Ophthalmol. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-10-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100896531 Medline TA: Clin Experiment Ophthalmol Country: Australia |
Other Details:
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Languages: eng Pagination: 705-17 Citation Subset: IM |
Copyright Information:
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© 2010 The Authors. Journal compilation © 2010 Royal Australian and New Zealand College of Ophthalmologists. |
Affiliation:
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Department of Surgery (Ophthalmology), Faculty of Medicine, University of Granada, Granada, Spain. fjcarreras@telefonica.net |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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