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Nuclear calcium signalling.

M D Bootman1, D Thomas, S C Tovey

  • 1Laboratory of Molecular Signalling, The Babraham Institute, Cambridge, United Kingdom. martin.bootman@bbsrc.ac.uk

Cellular and Molecular Life Sciences : CMLS
|May 24, 2000
PubMed
Summary
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Nuclear calcium (Ca2+) signaling shows conflicting results regarding gradients between the nucleus and cytoplasm. Our research indicates cytoplasmic Ca2+ release events can signal the nucleus without increasing bulk cytoplasmic Ca2+ levels.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Nuclear calcium (Ca2+) signaling is crucial for cellular processes, but observations of nuclear/cytoplasmic Ca2+ gradients are inconsistent.
  • The existence and origin of these gradients across the nuclear envelope, despite numerous nuclear pore complexes (NPCs), remain poorly understood.
  • While nuclei possess components for autonomous signaling, Ca2+ release from the inner nuclear envelope during physiological stimulation is debated.

Purpose of the Study:

  • To investigate the mechanisms underlying nuclear calcium (Ca2+) signaling and the discrepancies in observed nuclear/cytoplasmic gradients.
  • To explore how cytoplasmic Ca2+ signals can influence nuclear Ca2+ levels without necessarily elevating bulk cytoplasmic concentrations.

Main Methods:

  • Utilized advanced microscopy and Ca2+ indicators to monitor Ca2+ dynamics in both cytoplasmic and nuclear compartments.

Related Experiment Videos

  • Employed cell models and specific pharmacological agents to perturb and observe Ca2+ signaling pathways.
  • Analyzed Ca2+ flux through nuclear pore complexes (NPCs) and potential Ca2+ release channels.

    • Main Results:

    • Observed that elementary Ca2+ release events originating in the cytoplasm can generate nuclear Ca2+ signals.
    • Demonstrated that these cytoplasmic events can occur without a detectable increase in bulk cytoplasmic Ca2+ concentration.
    • Provided evidence challenging the notion of significant Ca2+ release from the inner nuclear envelope during physiological stimulation.

    Conclusions:

    • Cytoplasmic Ca2+ release events are a plausible mechanism for generating nuclear Ca2+ signals.
    • The observed discrepancies in nuclear/cytoplasmic Ca2+ gradients may stem from the localized nature of cytoplasmic Ca2+ signaling.
    • Further research is needed to fully elucidate the complex interplay of Ca2+ signaling mechanisms impacting nuclear Ca2+.