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Pancreatic calcium waves and secretion

H Kasai1

  • 1Department of Physiology, Faculty of Medicine, University of Tokyo, Japan.

Ciba Foundation Symposium
|January 1, 1995
PubMed
Summary
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Pancreatic acinar cells generate stereotypic calcium (Ca2+) waves via distinct release mechanisms and polarized signaling. Inositol 1,4,5-trisphosphate (InsP3) acts as a long-range messenger, triggering localized Ca2+ signals for enzyme secretion.

Area of Science:

  • Cellular Biology
  • Physiology
  • Biochemistry

Background:

  • Pancreatic acinar cells exhibit characteristic calcium (Ca2+) waves upon stimulation.
  • These waves originate from internal Ca2+ stores and propagate directionally.

Purpose of the Study:

  • To elucidate the key mechanisms driving Ca2+ wave generation in pancreatic acinar cells.
  • To understand the roles of inositol 1,4,5-trisphosphate (InsP3) and cytosolic Ca2+ in signal propagation.

Main Methods:

  • Investigated Ca2+ wave dynamics and signaling pathways in pancreatic acinar cells.
  • Analyzed the distribution and sensitivity of Ca2+ release channels, including InsP3 receptors.

Main Results:

  • Identified three distinct, polarized Ca2+ release mechanisms contributing to composite Ca2+ waves.

Related Experiment Videos

  • Demonstrated that InsP3 diffuses as a long-range messenger, while Ca2+ signals are locally confined.
  • Showcased preferential activation of a trigger zone (T zone) for enzyme secretion.

    • Conclusions:

    • A combination of polarized Ca2+ release and differential messenger diffusion underlies Ca2+ wave formation.
    • The T zone's activation by localized Ca2+ signals is crucial for pancreatic enzyme and fluid secretion.
    • Ca2+ waves and oscillations likely enhance T zone function and secretion efficiency.