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Related Experiment Videos

Generation, control, and processing of cellular calcium signals.

E Carafoli1, L Santella, D Branca

  • 1Department of Biochemistry, University of Padova, Italy. carafoli@civ.bio.unipd.it

Critical Reviews in Biochemistry and Molecular Biology
|May 24, 2001
PubMed
Summary

Calcium ions (Ca2+) are crucial intracellular messengers, acting as signals that control vital cell functions. Specialized sensor proteins and membrane transporters regulate Ca2+ levels, impacting cell life and death.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Physiology

Background:

  • Calcium ions (Ca2+) are essential intracellular messengers.
  • Cellular Ca2+ concentration is tightly regulated by sensor proteins and membrane transporters.
  • Ca2+ plays a dual role in cell signaling, regulating both life and death processes.

Purpose of the Study:

  • To explore the multifaceted roles of Ca2+ as an intracellular messenger.
  • To elucidate the mechanisms by which Ca2+ concentration is controlled within cells.
  • To understand Ca2+ 's involvement in cellular homeostasis and programmed cell death.

Main Methods:

  • Review of existing literature on Ca2+ signaling.
  • Analysis of Ca2+ sensor protein function and conformational changes.

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  • Examination of Ca2+ transport mechanisms across cellular membranes.

    • Main Results:

    • Ca2+ concentration is modulated by specific sensor proteins and membrane transporters.
    • Sensor proteins decode Ca2+ signals through conformational changes.
    • Organelle membranes (ER, mitochondria, nuclear envelope) maintain Ca2+ homeostasis.
    • Ca2+ regulates diverse cellular processes including contraction, secretion, and gene transcription.
    • Dysregulated Ca2+ can trigger programmed cell death or toxic cell death.

    Conclusions:

    • Ca2+ is a versatile signaling molecule critical for cellular function and survival.
    • Precise control of intracellular Ca2+ levels is vital for cell viability.
    • Aberrant Ca2+ signaling contributes to pathological cell death pathways.