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Mechanisms and function of intercellular calcium signaling
M J Sanderson1, A C Charles, S Boitano
1Department of Anatomy and Cell Biology, University of California, Los Angeles 90024.
Molecular and Cellular Endocrinology
|January 1, 1994
Summary
Intercellular calcium (Ca2+) waves facilitate cell communication, propagating via gap junctions. Inositol trisphosphate (IP3) acts as the primary messenger, not Ca2+, enabling multicellular coordination.
Area of Science:
- Cell biology
- Biophysics
Background:
- Intercellular calcium (Ca2+) waves are observed in diverse cell types, suggesting a general cell communication mechanism.
- These waves are initiated by mechanical or chemical stimuli and propagate through gap junctions.
Purpose of the Study:
- To investigate the signaling mechanisms underlying intercellular Ca2+ wave propagation.
- To determine the role of Ca2+ versus other messengers in intercellular communication.
Main Methods:
- Analysis of Ca2+ wave propagation dynamics.
- Investigation of gap junctional communication pathways.
- Identification of intracellular messengers involved in wave transmission.
Main Results:
- Intercellular Ca2+ wave propagation does not strictly require Ca2+ movement between cells.
- Inositol trisphosphate (IP3) is identified as the key messenger transmitted through gap junctions.
- A regenerative IP3 mechanism is likely essential for effective multicellular communication.
- Extracellular Ca2+ signaling pathways can supplement or replace gap junctional communication.
Conclusions:
- Intercellular Ca2+ waves utilize IP3 as the primary gap junction-permeant messenger.
- Multicellular communication via Ca2+ waves may be coordinated by regenerative IP3 signaling.
- Extracellular signaling provides an alternative or complementary mechanism for cell-to-cell communication.