Simplified model of cytosolic Ca2+ dynamics in the presence of one or several clusters of Ca2+ -release channels

Calcium release from intracellular stores plays a key role in the regulation of a variety of cellular activities. In various cell types this release occurs through inositol-triphosphate (IP3) receptors which are Ca2+ channels whose open probability is modulated by the cytosolic Ca2+ concentration it...

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Autor principal: Solovey, G.
Otros Autores: Fraiman, D., Pando, B., Ponce Dawson, Silvina Martha
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2008
Acceso en línea:Registro en Scopus
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Registro en la Biblioteca Digital
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100 1 |a Solovey, G. 
245 1 0 |a Simplified model of cytosolic Ca2+ dynamics in the presence of one or several clusters of Ca2+ -release channels 
260 |c 2008 
270 1 0 |m Solovey, G.; Departamento de Física, FCEN-UBA, Pabellón I, (1428) Buenos Aires, Argentina 
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506 |2 openaire  |e Política editorial 
520 3 |a Calcium release from intracellular stores plays a key role in the regulation of a variety of cellular activities. In various cell types this release occurs through inositol-triphosphate (IP3) receptors which are Ca2+ channels whose open probability is modulated by the cytosolic Ca2+ concentration itself. Thus, the combination of Ca2+ release and Ca2+ diffusion evokes a variety of Ca2+ signals depending on the number and relative location of the channels that participate of them. In fact, a hierarchy of Ca2+ signals has been observed in Xenopus laevis oocytes, ranging from very localized events (puffs and blips) to waves that propagate throughout the cell. In this cell type channels are organized in clusters. The behavior of individual channels within a cluster cannot be resolved with current optical techniques. Therefore, a combination of experiments and mathematical modeling is unavoidable to understand these signals. However, the numerical simulation of a detailed mathematical model of the problem is very hard given the large range of spatial and temporal scales that must be covered. In this paper we present an alternative model in which the cluster region is modeled using a relatively fine grid but where several approximations are made to compute the cytosolic Ca2+ concentration ([Ca2+]) distribution. The inner-cluster [Ca2+] distribution is used to determine the openings and closings of the channels of the cluster. The spatiotemporal [Ca2+] distribution outside the cluster is determined using a coarser grid in which each (active) cluster is represented by a point source whose current is proportional to the number of open channels determined before. A full reaction-diffusion system is solved on this coarser grid. © 2008 The American Physical Society.  |l eng 
593 |a Departamento de Física, FCEN-UBA, Pabellón I, (1428) Buenos Aires, Argentina 
593 |a Departamento de Matemática y Ciencias, Universidad de San Andrés, Buenos Aires, Argentina 
593 |a Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States 
690 1 0 |a CALCIUM 
690 1 0 |a CONCENTRATION (PROCESS) 
690 1 0 |a ENZYME ACTIVITY 
690 1 0 |a SEMICONDUCTOR DOPING 
690 1 0 |a SUGARS 
690 1 0 |a CA2+ RELEASES 
690 1 0 |a CALCIUM RELEASES 
690 1 0 |a CELL TYPES 
690 1 0 |a CELLULAR ACTIVITIES 
690 1 0 |a CLUSTER REGIONS 
690 1 0 |a COARSER GRIDS 
690 1 0 |a CYTOSOLIC 
690 1 0 |a FINE GRIDS 
690 1 0 |a INTRACELLULAR STORES 
690 1 0 |a LARGE RANGES 
690 1 0 |a LOCALIZED EVENTS 
690 1 0 |a MATHEMATICAL MODELING 
690 1 0 |a NUMERICAL SIMULATIONS 
690 1 0 |a OPEN CHANNELS 
690 1 0 |a OPTICAL TECHNIQUES 
690 1 0 |a POINT SOURCES 
690 1 0 |a REACTION-DIFFUSION SYSTEMS 
690 1 0 |a RELATIVE LOCATIONS 
690 1 0 |a SIMPLIFIED MODELS 
690 1 0 |a SPATIO TEMPORALS 
690 1 0 |a TEMPORAL SCALES 
690 1 0 |a TRIPHOSPHATE 
690 1 0 |a XENOPUS LAEVIS OOCYTES 
690 1 0 |a PROBABILITY DISTRIBUTIONS 
700 1 |a Fraiman, D. 
700 1 |a Pando, B. 
700 1 |a Ponce Dawson, Silvina Martha 
773 0 |d 2008  |g v. 78  |k n. 4  |p Phys. Rev. E Stat. Nonlinear Soft Matter Phys.  |x 15393755  |t Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 
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856 4 0 |u https://doi.org/10.1103/PhysRevE.78.041915  |y DOI 
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