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• W2045244934 abstract "The cytosolic free calcium concentration ([Ca2+]i) of the social amoeba Dictyostelium discoideum was analyzed after challenge with the chemoattractant cAMP. [Ca2+]i was measured by digital imaging in single cells loaded with the Ca2+ indicator Fura-2-dextran. Global stimulation with low concentrations of cAMP (0.1-1 microM) led to a global transient [Ca2+]i increase. This increase was abolished when cells were illuminated with high doses of light. However, after a short recovery period of several minutes, the cells again displayed the normal response. Inhibition of the [Ca2+]i elevation depended on the wavelength of illumination light. We compared the required recovery period of cells irradiated with either 340, 380, 405, 450 or 490 nm at defined intensities. Light of 405 nm had a pronounced effect; 340 nm alone or in combination with 380 nm was also effective, but to a lesser extent, whereas neither 450 nm nor 490 nm inhibited the [Ca2+]i increase, even at very high irradiance. The wavelength dependence matched the absorption spectrum of amoebae grown in darkness that contain a photopigment which seems to be responsible for phototaxis of single cells. Cells grown in darkness exhibited an increased sensitivity of the cAMP-induced [Ca2+]i transient towards light compared to light-grown cells. From these data we conclude that phototactic signaling could interfere with chemotactic signaling at the level of [Ca2+]i changes." @default.
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• W2045244934 date "1997-07-01" @default.
• W2045244934 modified "2023-10-13" @default.
• W2045244934 title "cAMP-induced changes in the cytosolic free Ca2+ concentration in Dictyostelium discoideum are light sensitive" @default.
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• W2045244934 doi "https://doi.org/10.1016/s0143-4160(97)90090-7" @default.
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