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Calcium: outside/inside homeostasis and signalling

R J Williams1

  • 1Inorganic Chemistry Laboratory, Oxford University, UK. susie.compton@chem.ox.ac.uk

Biochimica Et Biophysica Acta
|January 27, 1999
PubMed
Summary

Calcium ions act as an integrating signal in cells, connecting various cellular compartments and functions. This study proposes viewing calcium flow as an electrical circuit, explaining its complex roles in cellular processes.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Increasing data highlight calcium-dependent effects across all cellular compartments.
  • Calcium's involvement intensifies with evolutionary complexity.
  • Calcium's roles span metabolism, nuclear functions, ion transport, and mineralization.

Purpose of the Study:

  • To propose calcium's integrating function within cellular networks.
  • To conceptualize calcium ion flow as analogous to electrical circuits in vivo.
  • To explain calcium's unique properties and signaling capabilities.

Main Methods:

  • Literature review and data synthesis on calcium's cellular roles.
  • Comparative analysis of calcium signaling with electrical circuit principles.
  • Examination of calcium ion's physical and chemical properties.

Main Results:

  • Calcium acts as a central integrating signal, connecting the extracellular environment to intracellular compartments like the cytoplasm, vesicles, organelles, and nucleus.
  • Cellular calcium dynamics exhibit properties analogous to electrical circuits, including pulsing, time delays, and energy transfer.
  • Calcium's unique ionic properties (size, charge, availability) enable its rapid flow and significant binding capacity, distinguishing it from other ions.

Conclusions:

  • Calcium's multifaceted roles suggest an integrating function, akin to electrons in electrical circuits.
  • Viewing calcium signaling through an electrical circuit analogy provides a framework for understanding its complex in vivo functions.
  • The unique characteristics of the calcium ion are crucial for its specialized signaling and integration roles within the cell.

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