Journal of Fluorescence

, Volume 11, Issue 2, pp 89–100

Cytoplasmic Changes in Cardiac Cells During a Contraction Cycle Detected by Fluorescence Polarization

  • Dror Fixler
  • Reuven Tirosh
  • Asher Shainberg
  • Motti Deutsch


Intracellular structural changes, occurring in a cardiac myocyte during a contraction cycle, were investigated by means of intracellular fluorescein fluorescence polarization (IFFP), in comparison to cytoplasmic concentration of Ca2+ [Ca2+]i measured by indo-1. A simple physical model is presented. It assumes a biphase intracellular matrix, differing in its potency to restrict hosting fluorescent probe mobility. The first is a mobile nonrestricting phase, made mostly of aqua (aqua zone), while the second is a mobile-restricting phase, allocated mainly at the proximity of the filament sites. Their physicochemical properties such as [Ca2+], viscosity, and pH, may differ, thereby influencing the hosting probe fluorescence characteristics differently. These possible influences were examined experimentally. Based on experimental data, the model enables the evaluation, to first order of approximation, of the relative number of fluorescent probes populating the two phases and the time variation viscosity (ηr(t)) of the mobile-restricting filament zones taking place throughout the contraction cycle.

Cardiac myocyte ion concentration indo-1 intracellular Ca2+ 


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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Dror Fixler
    • 1
  • Reuven Tirosh
    • 1
  • Asher Shainberg
    • 2
  • Motti Deutsch
    • 1
  1. 1.The Jerome Schottenstein Cellscan Center for Early Detection of Cancer, Physics DepartmentBar-Ilan UniversityRamat-GanIsrael
  2. 2.Faculty of Life SciencesBar-Ilan UniversityRamat-GanIsrael

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