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Related Experiment Videos

A diffusion-translocation model for gradient sensing by chemotactic cells.

M Postma1, P J Van Haastert

  • 1Groningen Biomolecular Sciences and Biotechnology Institute, Department of Biochemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.

Biophysical Journal
|August 18, 2001
PubMed
Summary
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Cells like Dictyostelium and neutrophils create localized responses to chemical signals. This localization depends on short-lived second messengers with limited spread, crucial for cell signaling and development.

Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Chemotactic cells, such as Dictyostelium and neutrophils, can amplify shallow chemoattractant gradients into localized intracellular signals.
  • Understanding the biophysical mechanisms behind this signal localization is key to comprehending cellular responses.

Purpose of the Study:

  • To investigate the biophysical parameters governing the establishment and maintenance of localized second messenger signals within cells.
  • To explore how positive feedback mechanisms and component translocation contribute to signal amplification and localization.
  • To model the process of gradient sensing and signal transduction in chemotactic cells.

Main Methods:

  • Mathematical modeling of second messenger dynamics, considering dispersion range (lambda) and degradation rate (k(-1)).

Related Experiment Videos

  • Analysis of models incorporating cytosolic component translocation to the plasma membrane.
  • Simulation of signal transduction cascades with varying numbers of translocating components.

    • Main Results:

    • The dispersion range (lambda) of second messengers, determined by diffusion (D(m)) and degradation (k(-1)), must be small relative to cell length for effective localization.
    • Short-lived second messengers (high k(-1)) with diffusion coefficients between 0-5 microm(2) s(-1) are optimal for signal localization.
    • Models with translocating components demonstrate significant nonlinear amplification, converting shallow receptor activity differences into large second messenger concentration gradients.
    • Cytosolic component depletion mediates communication between cell regions, leading to local activation and global inhibition.

    Conclusions:

    • Signal localization in chemotactic cells relies on second messengers with restricted dispersion ranges and short lifetimes.
    • Translocation of signaling components and positive feedback mechanisms are crucial for amplifying shallow gradients.
    • The proposed biochemical mechanism provides a general explanation for signal localization phenomena in cell signaling, morphogenesis, and differentiation.