Document Detail

Physiologic properties of Müller cells from human eyes affected with uveal melanoma.
MedLine Citation:
PMID:  22669714     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To study physiologic characteristics of human Müller cells from healthy and pathologically altered eyes.
METHODS: Human tissue was used from organ donors and from patients affected with uveal melanoma. Several melanoma eyes also showed retinal detachment. Incubation of freshly prepared slices with a commercial vital dye preferentially stained Müller cells. The Müller cell response to hypotonic stress was observed by recording the cross-sectional area of cell somata. Electrophysiologic properties were investigated in parallel in whole-cell patch-clamp experiments.
RESULTS: Inward K+ currents mediated by inwardly rectifying Kir channels were significantly decreased in Müller cells from eyes with uveal melanoma compared with healthy controls. This was accompanied by a decrease of the membrane potential. Both effects were stronger in cells from eyes where the melanoma had caused a widespread retinal detachment. Application of a hypotonic solution did not affect Müller cells from healthy organ donors. By contrast, Müller cells from some melanoma eyes increased their soma size in response to hypotonic solution. This effect was aggravated in cells from eyes with widespread retinal detachment. The inflammatory mediator, arachidonic acid, could induce Müller cell swelling, whereas anti-inflammatory substances reduced the swelling.
CONCLUSIONS: The experiments with human tissue confirm earlier data from animal models for retinal pathologies about typical alterations of reactive Müller cells. Hypotonic stress induced Müller cell swelling preferentially in cells from melanoma-affected eyes that displayed decreased inward current amplitudes. Widespread melanoma-associated retinal detachment potentiated the pathologic alterations of Müller cells.
Antje Grosche; Thomas Pannicke; Anett Karl; Ianors Iandiev; Mike Francke; Peter Wiedemann; Andreas Reichenbach; Andreas Bringmann
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-06-28
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  53     ISSN:  1552-5783     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  2012  
Date Detail:
Created Date:  2012-06-29     Completed Date:  2012-09-18     Revised Date:  2013-01-09    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4170-6     Citation Subset:  IM    
Paul-Flechsig-Institut für Hirnforschung, Universität Leipzig, Leipzig, Germany.
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MeSH Terms
Melanoma / pathology,  physiopathology*
Membrane Potentials / physiology
Neuroglia / cytology,  physiology*
Patch-Clamp Techniques
Retinal Ganglion Cells / physiology*
Tumor Cells, Cultured
Uveal Neoplasms / pathology,  physiopathology*

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