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Related Experiment Videos

The frequency encoding of pulsatility.

A Goldbeter1, G Dupont, J Halloy

  • 1Unité de Chronobiologie Théorique, Faculté des Sciences, Université Libre de Bruxelles, Belgium.

Novartis Foundation Symposium
|April 7, 2000
PubMed
Summary
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Biological rhythms use pulsatile signaling for efficient cell communication. Signal frequency encodes information, optimizing responses and preventing desensitization in systems like hormone secretion and calcium oscillations.

Area of Science:

  • Cellular Biology
  • Biophysics
  • Biochemistry

Background:

  • Pulsatile signaling is a widespread phenomenon in intercellular communication, crucial for biological rhythms.
  • Constant stimulation can lead to target cell desensitization, making pulsatile signals more efficient.
  • Frequency encoding within pulsatile signals offers a mechanism to convey information beyond simple presence or absence of a stimulus.

Purpose of the Study:

  • To explore examples of frequency encoding in biological pulsatility beyond neuronal signaling.
  • To investigate how receptor desensitization influences cellular responses to pulsatile stimuli.
  • To elucidate the molecular mechanisms underlying frequency encoding in intracellular calcium oscillations.

Main Methods:

  • Analysis of existing models and data for cAMP oscillations in Dictyostelium discoideum.

Related Experiment Videos

  • Examination of pulsatile hormone secretion patterns (e.g., GnRH, growth hormone).
  • Modeling of intracellular Ca2+ oscillations and associated protein phosphorylation pathways.

    • Main Results:

    • Models demonstrate that receptor desensitization can be optimized for pulsatile cAMP and hormonal stimulation.
    • Optimal signal duration and inter-pulse intervals depend on desensitization/resensitization rates and ligand levels.
    • Intracellular Ca2+ oscillation frequency correlates with stimulation intensity and influences protein phosphorylation levels via Ca(2+)-calmodulin activated kinase.

    Conclusions:

    • Pulsatile signaling, particularly frequency encoding, is a key strategy for biological communication and rhythm generation.
    • Mathematical models reveal how cellular responses can be tuned by signal frequency and receptor dynamics.
    • Distinct molecular mechanisms underpin frequency encoding in different biological systems, such as hormonal regulation and calcium signaling.