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- W2000830053 abstract "Human neutrophils, preloaded with the fluorescent probe, Fura-2, were exposed to Ca2+-releasing agents. The monitored traces of fluorescence were transformed by computer to cytosolic Ca2+ concentration ([ Ca2+]i). Due to quenching of Fura-2, the addition of Mn2+ enabled us to compute the cytosolic concentration of total manganese ([Mn]i). The agents used were the novel Ca2+-mobilizing agent, thapsigargin (Tg), the chemotactic peptide, formyl-methionyl-leucyl-phenylalanine (FMLP), and the divalent cation ionophore, A23187. The agents caused transient rises of [Ca2+]i and monotonous rises of [Mn]i, suggesting influx but no efflux of Mn2+. The rise time of [Ca2+]i and the time constants and magnitude of the apparent Mn2+ influx were strongly dependent on the sequence of addition of the agonist and Ca2+. Contrary to FMLP, Tg needed several minutes to exert its full effect on the rise of [Ca2+]i and on the influx of Mn2+, the latter being dependent on two phases, activation and partial inactivation. Pretreatment with phorbol 12-myristate 13-acetate (PMA) inhibited the responses of Tg, FMLP and A23187. For comparison, human red blood cells were tested. Contrary to A23187, Tg did not induce Ca2+ uptake in ATP-depleted red cells but increased the Ca2+ pump flux in intact red cells by 10%. The experimental data and computer simulations of the granulocyte data suggest that time-dependent changes of both passive Ca2+ flux into the cytosol and Ca2+ flux of the plasma membrane pump are involved in the transient [Ca2+]i response." @default.
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- W2000830053 date "1989-10-01" @default.
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- W2000830053 title "Ca2+ transients and Mn2+ entry in human neutrophils induced by thapsigargin" @default.
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- W2000830053 doi "https://doi.org/10.1016/0143-4160(89)90025-0" @default.
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