Quantifying calcium fluxes underlying calcium puffs in Xenopus laevis oocytes
We determine the calcium fluxes through inositol 1,4,5-trisphosphate receptor/channels underlying calcium puffs of Xenopus laevis oocytes using a simplified version of the algorithm of Ventura et al. [1]. An analysis of 130 puffs obtained with Fluo-4 indicates that Ca2+ release comes from a region o...
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| Otros Autores: | , , , |
| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier Ltd
2010
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| LEADER | 10809caa a22010577a 4500 | ||
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| 001 | PAPER-8067 | ||
| 003 | AR-BaUEN | ||
| 005 | 20241101144106.0 | ||
| 008 | 190411s2010 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-77649271066 | |
| 024 | 7 | |2 cas |a calcium ion, 14127-61-8 | |
| 030 | |a CECAD | ||
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Bruno, Luciana | |
| 245 | 1 | 0 | |a Quantifying calcium fluxes underlying calcium puffs in Xenopus laevis oocytes |
| 260 | |b Elsevier Ltd |c 2010 | ||
| 270 | 1 | 0 | |m Solovey, G.; Departamento de Física, Facultad de Ciencias Exactas y Naturales, UBA, Ciudad Universitaria, Pabellon I, 1428 Buenos Aires, Argentina; email: gsolovey@rockefeller.edu |
| 504 | |a Ventura, A.C., Bruno, L., Demuro, A., Parker, I., Dawson, S.P., A model-independent algorithm to derive Ca2+ fluxes underlying local cytosolic Ca2+ transients (2005) Biophys. J., 88, pp. 2403-2421 | ||
| 504 | |a Rose, H.J., Dargan, S., Shuai, J., Parker, I., 'Trigger' events precede calcium puffs in Xenopus oocytes (2006) Biophys. J., 91, pp. 4024-4032 | ||
| 504 | |a Callamaras, N., Parker, I., Radial localization of inositol 1,4,5-trisphosphate-sensitive Ca2+ release sites in Xenopus oocytes resolved by axial confocal linescan imaging (1999) J. Gen. Physiol., 113, pp. 199-213 | ||
| 504 | |a Shuai, J., Rose, H.J., Parker, I., The number and spatial distribution of IP3 receptors underlying calcium puffs in Xenopus oocytes (2006) Biophys. J., 91, pp. 4033-4044 | ||
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| 504 | |a Sun, X.P., Callamaras, N., Marchant, J.S., Parker, I., A continuum of InsP3-mediated elementary Ca2+ signalling events in Xenopus oocytes (1998) J. Physiol., 509 (PART 1), pp. 67-80 | ||
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| 504 | |a Demuro, A., Parker, I., Optical patch-clamping: single-channel recording by imaging Ca2+ flux through individual muscle acetylcholine receptor channels (2005) J. Gen. Physiol., 126, pp. 179-192 | ||
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| 504 | |a Falcke, M., On the role of stochastic channel behavior in intracellular Ca2+ dynamics (2003) Biophys. J., 84, pp. 42-56 | ||
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| 506 | |2 openaire |e Política editorial | ||
| 520 | 3 | |a We determine the calcium fluxes through inositol 1,4,5-trisphosphate receptor/channels underlying calcium puffs of Xenopus laevis oocytes using a simplified version of the algorithm of Ventura et al. [1]. An analysis of 130 puffs obtained with Fluo-4 indicates that Ca2+ release comes from a region of width ∼450 nm, that the release duration is peaked around 18 ms and that the underlying Ca2+ currents range between 0.12 and 0.95 pA. All these parameters are independent of IP3 concentration. We explore what distributions of channels that open during a puff, Np, and what relations between current and number of open channels, I(Np), are compatible with our findings and with the distribution of puff-to-trigger amplitude ratio reported in Rose et al. [2]. To this end, we use simple "mean field" models in which all channels open and close simultaneously. We find that the variability among clusters plays an important role in shaping the observed puff amplitude distribution and that a model for which I(Np) ∼ Np for small Np and I (Np) ∼ Np 1 / α (α > 1) for large Np, provides the best agreement. Simulations of more detailed models in which channels open and close stochastically show that this nonlinear behavior can be attributed to the limited time resolution of the observations and to the averaging procedure that is implicit in the mean-field models. These conclusions are also compatible with observations of ∼400 puffs obtained using the dye Oregon green. © 2009 Elsevier Ltd. All rights reserved. |l eng | |
| 593 | |a Departamento de Física, Facultad de Ciencias Exactas y Naturales, UBA, Ciudad Universitaria, Pabellon I, 1428 Buenos Aires, Argentina | ||
| 593 | |a Department of Neurobiology and Behavior, University of California, Irvine, CA 92697-4550, United States | ||
| 593 | |a Department of Physiology and Biophysics, University of California, Irvine, CA 92697-4550, United States | ||
| 593 | |a CONICET, Argentina | ||
| 690 | 1 | 0 | |a BACKWARD METHODS |
| 690 | 1 | 0 | |a CALCIUM FLUXES |
| 690 | 1 | 0 | |a CONFOCAL MICROSCOPY |
| 690 | 1 | 0 | |a IP3RS |
| 690 | 1 | 0 | |a PUFFS |
| 690 | 1 | 0 | |a XENOPUS LAEVIS |
| 690 | 1 | 0 | |a CALCIUM ION |
| 690 | 1 | 0 | |a DYE |
| 690 | 1 | 0 | |a INOSITOL 1,4,5 TRISPHOSPHATE RECEPTOR |
| 690 | 1 | 0 | |a ALGORITHM |
| 690 | 1 | 0 | |a ANIMAL CELL |
| 690 | 1 | 0 | |a ARTICLE |
| 690 | 1 | 0 | |a CALCIUM CURRENT |
| 690 | 1 | 0 | |a CALCIUM TRANSPORT |
| 690 | 1 | 0 | |a CONTROLLED STUDY |
| 690 | 1 | 0 | |a NONHUMAN |
| 690 | 1 | 0 | |a OOCYTE |
| 690 | 1 | 0 | |a PRIORITY JOURNAL |
| 690 | 1 | 0 | |a SIMULATION |
| 690 | 1 | 0 | |a STATISTICAL MODEL |
| 690 | 1 | 0 | |a XENOPUS LAEVIS |
| 690 | 1 | 0 | |a NEPTUNIA |
| 690 | 1 | 0 | |a XENOPUS LAEVIS |
| 700 | 1 | |a Solovey, G. | |
| 700 | 1 | |a Ventura, A.C. | |
| 700 | 1 | |a Dargan, S. | |
| 700 | 1 | |a Dawson, S.P. | |
| 773 | 0 | |d Elsevier Ltd, 2010 |g v. 47 |h pp. 273-286 |k n. 3 |p Cell Calcium |x 01434160 |w (AR-BaUEN)CENRE-4124 |t Cell Calcium | |
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