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Related Experiment Videos

Calcium signalling in exocrine glands

G S Bird1, M C Louzao, C M Ribeiro

  • 1Calcium Regulation Section, Lab. Signal Transduction, Nat. Inst. Environmental Health Sciences, NIH Research Triangle Park, NC 27709, USA. bird@niehs.nih.gov

European Journal of Morphology
|November 24, 1998
PubMed
Summary

Stimulating exocrine gland cells releases intracellular calcium via inositol 1,4,5-trisphosphate (IP3). This depletion triggers capacitative calcium entry, a key process for cell signaling.

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Area of Science:

  • Cellular Biology
  • Physiology
  • Biochemistry

Background:

  • Surface receptor stimulation in exocrine gland cells activates phospholipase C, generating inositol 1,4,5-trisphosphate (IP3).
  • IP3 triggers the release of intracellular calcium (Ca2+), which is followed by Ca2+ entry across the plasma membrane.
  • The precise mechanisms regulating Ca2+ entry, particularly in response to IP3, are not fully elucidated.

Purpose of the Study:

  • To investigate the regulatory processes governing capacitative calcium entry in exocrine gland cells.
  • To understand the role of intracellular Ca2+ store depletion in initiating Ca2+ influx.
  • To elucidate the signaling pathways linking surface receptor activation to Ca2+ homeostasis.

Main Methods:

  • Utilizing exocrine gland cell models.

Related Experiment Videos

  • Employing techniques to measure intracellular Ca2+ concentrations and fluxes.
  • Investigating the effects of IP3 and related signaling molecules on Ca2+ dynamics.

    • Main Results:

    • Demonstrated that IP3-mediated depletion of intracellular Ca2+ stores is a critical trigger for capacitative calcium entry.
    • Identified key signaling events linking receptor activation to Ca2+ influx in exocrine cells.
    • Provided evidence supporting the 'capacitative calcium entry' hypothesis.

    Conclusions:

    • Capacitative calcium entry is a fundamental mechanism for maintaining Ca2+ homeostasis in exocrine gland cells.
    • Understanding these Ca2+ signaling pathways is crucial for comprehending exocrine gland function.
    • Further research into these mechanisms could reveal therapeutic targets for diseases involving dysregulated Ca2+ signaling.