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Localization of steady currents in the lens
Current Eye Research
|January 1, 1982
Summary
Steady electrical currents in rat lenses were mapped using a vibrating probe. Inward currents occurred at the anterior and posterior poles, while outward currents were at the equator, indicating ion transport vital for lens function.
Area of Science:
- Ophthalmology
- Physiology
- Biophysics
Background:
- The rat lens exhibits electrical currents, suggesting active ion transport mechanisms.
- Understanding these currents is crucial for comprehending lens physiology and potential pathologies.
Purpose of the Study:
- To map the spatial distribution of steady electrical currents around the rat lens.
- To investigate the influence of potassium concentration and ouabain on these currents.
Main Methods:
- Utilized a vibrating probe technique to measure extracellular currents around the rat lens.
- Exposed lenses to varying potassium concentrations and ouabain to assess current modulation.
Main Results:
- Identified inward currents at the anterior and posterior poles and outward currents at the equator.
- High potassium concentrations inhibited and reversed these currents.
- Ouabain blocked currents after 24 hours but not after 6 hours of exposure.
- Currents were observed in various ionic solutions, indicating robustness.
Conclusions:
- The rat lens possesses distinct regional ion fluxes.
- Potassium ions play a significant role in regulating lens electrical currents.
- Na+/K+-ATPase activity, as suggested by ouabain's delayed effect, may contribute to these currents.