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- W2090535679 abstract "The eggs of most or all animals are thought to be activated after fertilization by a transient increase in free cytosolic Ca2+ concentration ([Ca2+]i). We have applied Ca2+-selective microelectrodes to detect such an increase in fertilized eggs of the frog, Xenopus laevis. As observed with an electrode in the animal hemisphere, [Ca2+]i increased from 0.4 to 1.2 microM over the course of 2 min after fertilization, and returned to its original value during the next 10 min. No further changes in [Ca2+]i were detected through the first cleavage division. In eggs impaled with two Ca2+ electrodes, the Ca2+ pulse was observed to travel as a wave from the animal to the vegetal hemisphere, propagating at a rate of approximately 10 microns/s across the animal hemisphere. The apparent delay between the start of the fertilization potential and initiation of the Ca2+ wave at the sperm entry site as approximately 1 min. Through these observations describe only the behavior of subcortical [Ca2+]i, we suggest that our data represent the subcortical extension of the cortical Ca2+ wave thought to trigger cortical granule exocytosis, and we present evidence that both the timing and magnitude of the Ca2+ pulse we observed are consistent with this identity. This first quantification of subcortical [Ca2+]i during fertilization indicates that the Ca2+ transient is available to regulate processes (e.g., protein synthesis) in the subcortical cytosol." @default.
- W2090535679 created "2016-06-24" @default.
- W2090535679 creator A5026231993 @default.
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- W2090535679 date "1985-04-01" @default.
- W2090535679 modified "2023-10-15" @default.
- W2090535679 title "An elevated free cytosolic Ca2+ wave follows fertilization in eggs of the frog, Xenopus laevis." @default.
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- W2090535679 doi "https://doi.org/10.1083/jcb.100.4.1325" @default.
- W2090535679 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2113751" @default.
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