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Related Experiment Videos

Age-related decrease of potassium currents in glial (Müller) cells of the human retina.

Andreas Bringmann1, Leon Kohen, Sebastian Wolf

  • 1Department of Ophthalmology, Eye Clinic, University of Leipzig, Medical Faculty, Leipzig, Germany. bria@medizin.uni-leipzig.de

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|November 19, 2003
PubMed
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Aging human Müller glial cells show reduced inwardly rectifying potassium (Kir) currents but increased high-voltage-activated (HVA) calcium currents. These changes in retinal glial cells may reflect age-related neuronal loss and altered calcium signaling.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Cell Biology

Background:

  • Retinal glial cells, specifically Müller cells, are less studied for age-related changes compared to retinal neurons.
  • Investigating age-dependent alterations in Müller glial cells is crucial for understanding retinal aging.

Purpose of the Study:

  • To investigate age-dependent alterations of inwardly rectifying potassium (Kir) currents in Müller glial cells of the human retina.
  • To examine changes in high-voltage-activated (HVA) calcium channels in aging Müller cells.

Main Methods:

  • Müller cells were isolated post mortem from human donors without eye disease history.
  • Whole-cell patch clamping was used to measure Kir and HVA calcium channel currents.

Main Results:

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  • Kir current amplitude decreased significantly with age, showing a strong correlation (p < 0.001).
  • Cells from donors >60 years had ~40% lower Kir currents than those <50 years.
  • HVA calcium current amplitude significantly increased with age (p < 0.001), up to ~500% in older donors (>55 years).

Conclusions:

  • The age-related decline in Kir currents in Müller cells may correlate with neuronal loss in the aging retina.
  • Retinal glial cells exhibit enhanced cytoplasmic calcium signaling during aging.