| Age-related decrease of potassium currents in glial (Müller) cells of the human retina. | |
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MedLine Citation:
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PMID: 14620033 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Age-dependent alterations have been investigated far less in retinal glial cells than in retinal neurons. We investigated age-dependent alterations of inwardly rectifying potassium (Kir) currents in Müller glial cells of the human retina. METHODS: Müller cells were isolated immediately post mortem from donors without a reported history of eye disease, and the amplitudes of Kir currents and of currents through high-voltage-activated (HVA) calcium channels were measured by whole-cell patch clamping. RESULTS: The amplitude of the Kir currents was lower in the cells from donors older than 50 years than in the cells of younger donors; the decrease was strongly correlated with the donor's age (p < 0.001). The current amplitude in the cells from donors older than 60 years was about 40% lower than the amplitude in the cells from donors younger than 50 years. The amplitude of the HVA currents was greater in the cells from donors older than 55 years than in the cells from younger donors; the increase, up to about 500%, was strongly age-dependent (p < 0.001). INTERPRETATION: The age-related decrease in Kir-current amplitude in Müller cells may reflect the neuron loss in the aged retina. Our findings also indicate that retinal glial cells have enhanced cytoplasmic calcium signals in the course of aging. |
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Authors:
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Andreas Bringmann; Leon Kohen; Sebastian Wolf; Peter Wiedemann; Andreas Reichenbach |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Canadian journal of ophthalmology. Journal canadien d'ophtalmologie Volume: 38 ISSN: 0008-4182 ISO Abbreviation: Can. J. Ophthalmol. Publication Date: 2003 Oct |
Date Detail:
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Created Date: 2003-11-17 Completed Date: 2003-12-29 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0045312 Medline TA: Can J Ophthalmol Country: Canada |
Other Details:
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Languages: eng Pagination: 464-8 Citation Subset: IM |
Affiliation:
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Department of Ophthalmology, Eye Clinic, University of Leipzig, Medical Faculty, Leipzig, Germany. bria@medizin.uni-leipzig.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aged, 80 and over Aging / physiology* Calcium Channels / metabolism Humans Middle Aged Neuroglia / physiology* Patch-Clamp Techniques Potassium / metabolism* Potassium Channels, Inwardly Rectifying / metabolism* Retina / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Calcium Channels; 0/Potassium Channels, Inwardly Rectifying; 7440-09-7/Potassium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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