Spelling suggestions: "subject:"calcium induced calcium release"" "subject:"alcium induced calcium release""
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A model of mitochonrial calcium induced calcium releaseThomas, Balbir 20 September 2007 (has links)
No description available.
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Calcium and Cancer: Implications for Cardiovascular Function and DiseaseStevens, Sarah CW 20 June 2012 (has links)
No description available.
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Multiphysics model of a cardiac myocyte: A voltage-clamp studyKrishna, Abhilash 24 July 2013 (has links)
We develop a composite multiphysics model of excitation-contraction coupling for a rat ventricular myocyte under voltage clamp (VC) conditions to: (1) probe mechanisms underlying the response to Ca2+-perturbation; (2) investigate the factors influencing its electromechanical response; and (3) examine its rate-dependent behavior (particularly the force-frequency response (FFR)). Motivation for the study was to pinpoint key control variables influencing calcium-induced calcium-release (CICR) and examine its role in the context of a physiological control system regulating cytosolic Ca2+ concentration and hence the cardiac contractile response.
Our cell model consists of an electrical-equivalent model for the cell membrane and a fluid-compartment model describing the flux of ionic species between the extracellular and several intracellular compartments. The model incorporates frequency-dependent calmodulin (CaM) mediated spatially heterogenous interaction of calcineurin (CaN) and Ca2+/calmodulin-dependent protein kinase-II (CaMKII) with their principal targets and accounts for rate-dependent, cyclic adenosine monophosphate (cAMP)-mediated up-regulation. We also incorporate a biophysical model for cardiac contractile mechanics to study the factors influencing force response.
The model reproduces measured VC data published by several laboratories, and generates graded Ca2+-release with high Ca2+ gain by achieving negative feedback control and Ca2+-homeostasis. We examine the dependence of cellular contractile response on: (1) the amount of activator Ca2+ available; (2) the type of mechanical load applied; (3) temperature (22 to 38ºC); and (4) myofilament Ca2+ sensitivity. We demonstrate contraction-relaxation coupling over a wide range of physiological perturbations. Our model reproduces positive peak FFR observed in rat ventricular myocytes and provides quantitative insight into the underlying rate-dependence of CICR.
The role of Ca2+ regulating mechanisms are examined in handling induced Ca2+-perturbations using a rigorous cellular Ca2+ balance. Extensive testing of the composite model elucidates the importance of various direct and indirect modulatory influences on the cellular twitch-response with wide agreement with measured data on all accounts. We identify cAMP-mediated stimulation, and rate-dependent CaMKII-mediated up-regulation of Ca2+-trigger current (ICaL) as the key mechanisms underlying the aforementioned positive FFR. Our model provides biophysically-based explanations of phenomena associated with CICR and provides mechanistic insights into whole-cell responses to a wide variety of testing approaches used in studies of cardiac myofilament contractility.
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Evaluating Non-Canonical Roles of KChIP2 In The HeartNassal, Drew 05 June 2017 (has links)
No description available.
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