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Related Experiment Videos

Bleached pigment produces a maintained decrease in outer segment Ca2+ in salamander rods

A P Sampath1, H R Matthews, M C Cornwall

  • 1Department of Physiological Science, University of California, Los Angeles, Los Angeles, California 90095, USA.

The Journal of General Physiology
|February 14, 1998
PubMed
Summary
This summary is machine-generated.

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Researchers measured cytoplasmic calcium (Ca2+i) in rod cells using a confocal microscope. Bright light significantly reduced Ca2+i, suggesting a role in visual adaptation.

Area of Science:

  • Cellular biology
  • Neuroscience
  • Vision science

Background:

  • Rod photoreceptors are crucial for vision in low light.
  • Calcium ions (Ca2+i) play a vital role in regulating photoreceptor function.
  • Understanding Ca2+i dynamics is key to deciphering visual adaptation mechanisms.

Purpose of the Study:

  • To quantify changes in cytoplasmic calcium concentration (Ca2+i) in isolated rod outer segments.
  • To investigate the relationship between light-induced photopigment bleaching and Ca2+i levels.
  • To explore the role of Ca2+i in bleach-induced adaptation of rod photoresponse.

Main Methods:

  • Utilized a spot confocal microscope with an argon ion laser for measurements.
  • Employed the fluorescent calcium indicator fluo-3 to monitor Ca2+i.

Related Experiment Videos

  • Simultaneously performed suction pipette recording of the rod photoresponse.

    • Main Results:

    • Ca2+i decline in response to saturating illumination followed a double exponential decay (260 ms and 2,200 ms).
    • Dark-adapted rod Ca2+i was estimated at 670 nM, dropping to 30 nM during response saturation.
    • Laser bleaching significantly reduced resting Ca2+i to 56% of the dark-adapted level, reversible with 11-cis-retinal.

    Conclusions:

    • Sustained activation of the phototransduction cascade by bleached pigment leads to a persistent decrease in rod outer segment Ca2+i.
    • This Ca2+i reduction is a likely contributor to the adaptation of photoresponse kinetics and sensitivity following light exposure.
    • The findings provide insights into the molecular mechanisms underlying visual adaptation in rod cells.