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Related Experiment Videos

Correlating Ca2+ responses and secretion in individual RBL-2H3 mucosal mast cells

T D Kim1, G T Eddlestone, S F Mahmoud

  • 1Department of Pharmacology, Cornell University, Ithaca, New York 14853, USA.

The Journal of Biological Chemistry
|February 12, 1998
PubMed
Summary

Calcium (Ca2+) signals are crucial for nonexcitable cells. This study shows that Ca2+ influx and signal amplitude, not just oscillations, drive serotonin secretion in mast cells.

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Area of Science:

  • Cellular Biology
  • Immunology
  • Biochemistry

Background:

  • The precise role of intracellular calcium (Ca2+) in stimulus-response coupling within nonexcitable cells remains largely unclear.
  • Individual cell Ca2+ responses are highly variable, featuring oscillations, but the specific signal characteristics essential for cellular function are unknown.

Purpose of the Study:

  • To investigate the temporal relationship between intracellular Ca2+ changes and serotonin secretion in RBL-2H3 mucosal mast cells.
  • To determine the critical features of Ca2+ signals that regulate stimulus-secretion coupling in nonexcitable cells.

Main Methods:

  • Utilized simultaneous indo-1 photometry and constant potential amperometry for single-cell analysis.
  • Employed thapsigargin to investigate the role of Ca2+ stores and influx in secretion.

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Main Results:

  • Serotonin secretion requires elevated intracellular Ca2+ and does not occur during initial Ca2+ oscillations.
  • Exocytosis is associated with Ca2+ oscillation peaks and sustained Ca2+ elevations.
  • Ca2+ influx, independent of store release, can trigger secretion, indicating store-associated microdomains are not essential.

Conclusions:

  • Ca2+ influx is a critical determinant for stimulus-secretion coupling in nonexcitable mast cells.
  • The amplitude of the Ca2+ signal, rather than oscillatory patterns alone, is important for triggering cellular responses.