Theoretical analysis of calcium wave propagation based on inositol (1,4,5)-trisphosphate (InsP3) receptor functional properties.

Abstract:

:In the presence of inositol (1,4,5)-trisphosphate (InsP3) repetitive waves of elevated cytosolic free Ca2+ (Ca waves) that travel through cellular cytoplasm are observed. Investigation of this phenomenon stimulated the view of cellular cytoplasm as 'an excitable medium composed of Ca release processes (InsP3R), coupled by a common stimulatory signal (Ca) through diffusion' [Lechleiter JD. Clapham DE. (1992) Molecular mechanisms of intracellular calcium excitability in Xenopus laevis oocytes. Cell, 69, 283-294]. Using a kinetic model of InsP3R gating, an analytical expression for the amplitude of Ca wave propagating through this excitable medium has been obtained. The amplitude of the Ca wave is determined by the combination of cell-specific parameters and the functional properties of a single InsP3R. An analytical expression for Ca wave propagation velocity has been also obtained using the Luther equation for diffusion-driven autocatalytic reaction. Both equations provided reasonable estimations for Ca wave amplitude (1.3 microM free Ca) and the velocity of the wave propagation (21 microns/s) for Ca waves in Xenopus oocytes when numerical values of parameters were used. The duration of refractory period has been shown to be determined mainly by the activity of CaATPase. Obtained results provide an insight into the mechanisms underlying the process of Ca wave propagation and define the interrelationship between different factors involved in this process. Some experimentally testable predictions can be done based on the analytical expressions obtained for Ca wave amplitude, the velocity of Ca wave propagation and the duration of refractory period.

journal_name

Cell Calcium

journal_title

Cell calcium

authors

Bezprozvanny I

doi

10.1016/0143-4160(94)90019-1

subject

Has Abstract

pub_date

1994-09-01 00:00:00

pages

151-66

issue

3

eissn

0143-4160

issn

1532-1991

pii

0143-4160(94)90019-1

journal_volume

16

pub_type

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