Interplay of ryanodine receptor distribution and calcium dynamics

Leighton T Izu, Shawn A. Means, John N. Shadid, Ye Chen-Izu, C. William Balke

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Spontaneously generated calcium (Ca2+) waves can trigger arrhythmias in ventricular and atrial myocytes. Yet, Ca2+ waves also serve the physiological function of mediating global Ca2+ increase and muscle contraction in atrial myocytes. We examine the factors that influence Ca2+ wave initiation by mathematical modeling and large-scale computational (supercomputer) simulations. An important finding is the existence of a strong coupling between the ryanodine receptor distribution and Ca 2+ dynamics. Even modest changes in the ryanodine receptor spacing profoundly affect the probability of Ca2+ wave initiation. As a consequence of this finding, we suggest that there is information flow from the contractile system to the Ca2+ control system and this dynamical interplay could contribute to the increased incidence of arrhythmias during heart failure.

Original languageEnglish (US)
Pages (from-to)95-112
Number of pages18
JournalBiophysical Journal
Volume91
Issue number1
DOIs
StatePublished - 2006
Externally publishedYes

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Ryanodine Receptor Calcium Release Channel
Muscle Cells
Cardiac Arrhythmias
Calcium
Calcium Signaling
Muscle Contraction
Heart Failure
Incidence

ASJC Scopus subject areas

  • Biophysics

Cite this

Interplay of ryanodine receptor distribution and calcium dynamics. / Izu, Leighton T; Means, Shawn A.; Shadid, John N.; Chen-Izu, Ye; Balke, C. William.

In: Biophysical Journal, Vol. 91, No. 1, 2006, p. 95-112.

Research output: Contribution to journalArticle

Izu, Leighton T ; Means, Shawn A. ; Shadid, John N. ; Chen-Izu, Ye ; Balke, C. William. / Interplay of ryanodine receptor distribution and calcium dynamics. In: Biophysical Journal. 2006 ; Vol. 91, No. 1. pp. 95-112.
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