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Related Experiment Videos

Human lens membrane cation permeability increases with age.

G Duncan1, K R Hightower, S A Gandolfi

  • 1School of Biological Sciences, University of East Anglia, Norwich, United Kingdom.

Investigative Ophthalmology & Visual Science
|August 1, 1989
PubMed
Summary
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Human lens aging involves increased sodium (Na+) and calcium (Ca2+) permeability, affecting membrane potential and optical density. This age-related change suggests new ion channels open as the lens ages.

Area of Science:

  • Ophthalmology
  • Biophysics
  • Cell Biology

Background:

  • Human lens aging is associated with changes in ionic balance and membrane properties.
  • Understanding these changes is crucial for addressing age-related visual impairment.

Purpose of the Study:

  • To investigate age-related alterations in ionic balance and membrane permeability of normal human lenses.
  • To correlate changes in ion transport with alterations in lens optical density.

Main Methods:

  • Parallel studies conducted in the USA, England, and Italy.
  • Measurements of lens membrane potential, resistance, and intracellular ion concentrations (Na+, Ca2+).
  • Analysis of transmembrane fluxes for sodium (Na+) and potassium (K+).

Main Results:

Related Experiment Videos

  • Significant age-related decline in lens membrane potential and resistance.
  • Marked increase in intracellular sodium (Na+) and free calcium (Ca2+) with age.
  • Concomitant stimulation of transmembrane fluxes for Na+ and K+.
  • Increased membrane permeability to Na+, K+, and Ca2+ ions correlates with increased lens optical density.

Conclusions:

  • Ageing human lenses exhibit increased permeability to ions like sodium (Na+), potassium (K+), and calcium (Ca2+).
  • This increased ion traffic is likely mediated by newly opened membrane channels.
  • The observed changes in ion permeability coincide with age-related increases in lens optical density.