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Related Experiment Videos

Free cyclic AMP increases in PC12 cells on depolarization

N Agnihotri1, W S Kisaalita, C H Keith

  • 1Department of Biological and Agricultural Engineering, University of Georgia, Athens 30602, USA.

Journal of Neuroscience Research
|March 1, 1997
PubMed
Summary

High potassium levels temporarily increase cyclic AMP (cAMP) in PC12 cells. This elevation in intracellular cyclic AMP (cAMP) diminishes with repeated stimulation, indicating a desensitization process.

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Area of Science:

  • Cellular signaling
  • Neuroscience
  • Biochemistry

Background:

  • Cyclic AMP (cAMP) is a crucial intracellular second messenger.
  • Understanding cAMP dynamics is vital for cellular function and response to stimuli.

Purpose of the Study:

  • To investigate the temporal dynamics of intracellular cyclic AMP (cAMP) in living PC12 cells.
  • To examine the effect of cellular depolarization on cAMP levels.

Main Methods:

  • Digital fluorescence ratio imaging was employed.
  • The cAMP indicator FlCRh was utilized for real-time monitoring.
  • PC12 cells were subjected to high potassium (K+) induced depolarization.

Main Results:

  • High K+ depolarization caused a transient elevation in free cAMP concentration.

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  • cAMP levels returned to baseline after removal of the depolarizing stimulus.
  • Successive depolarizations led to a progressively reduced cAMP elevation, suggesting desensitization.

    • Conclusions:

    • PC12 cells exhibit dynamic changes in cAMP in response to depolarization.
    • Repeated stimulation leads to a diminished cAMP response, indicating a regulatory mechanism.