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Title

Intracellular pattern of cytosolic Ca2+ changes during adhesion and multiple phagocytosis in human neutrophils. Dynamics of intracellular Ca2+ stores

Authors
Theler, J. M.
Jaconi, M. E.
Wollheim, C. B.
Published in Blood. 1995, vol. 85, no. 8, p. 2194-2201
Abstract The subcellular pattern of cytosolic free Ca2+ ([Ca2+]i) changes in human polymorphonuclear neutrophils (PMNs) was studied using imaging of fura-2 fluorescence (time resolution 12.5 ratios/s) to determine whether PMNs could obtain directional information from the [Ca2+]i signal. [Ca2+]i changes were observed during initial adherence, the subsequent chemotactic movement, and the phagocytosis of opsonized yeast particles. Initial adherence was followed by a rapid increase in [Ca2+]i (from 90 +/- 10 to 290 +/- 40 nmol/L in 6.5 +/- 2.5 seconds; +/- SEM, n = 10), apparently homogeneously distributed over the entire cytoplasm, which preceded the spreading of the PMNs. [Ca2+]i increases after the contact of the PMNs with yeast particles were of lower mean amplitude; [Ca2+]i increased simultaneously throughout the cytosol. In the absence of extracellular Ca2+, multiple phagocytotic events could proceed normally without a mandatory [Ca2+]i transient. In PMNs polarized on phagocytosis, gradients in [Ca2+]i could be observed. [Ca2+]i was more elevated in the periphagosomal area than in the remaining parts. Taken together, these data show that [Ca2+]i waves do not provide the neutrophil with directional information during chemotaxis and phagocytosis. Sustained small inhomogeneity of [Ca2+]i levels are consistent with a proposed redistribution of releasable Ca2+ stores on phagocytosis.
Keywords AdultCalcium/ metabolismCell AdhesionCell CompartmentationChemotaxis, LeukocyteComplement System ProteinsCytosol/chemistryHumansImage Processing, Computer-AssistedIntracellular Fluid/chemistryNeutrophils/chemistry/ physiology/ultrastructurePhagocytosisSaccharomyces cerevisiaeVideotape Recording
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PMID: 7718891
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THELER, J. M. et al. Intracellular pattern of cytosolic Ca2+ changes during adhesion and multiple phagocytosis in human neutrophils. Dynamics of intracellular Ca2+ stores. In: Blood, 1995, vol. 85, n° 8, p. 2194-2201. https://archive-ouverte.unige.ch/unige:7606

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Deposited on : 2010-06-21

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