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• W1982124619 startingPage "358" @default.
• W1982124619 abstract "The pH-dependent control of the rate of protein synthesis in the fertilized sea urchin egg has suggested that pH may have an important role in cell activation at fertilization. We looked for similar changes of intracellular pH during meiotic maturation of the Xenopus oocyte. The basal pH of the oocyte is in the range 7.4–7.8. The higher values were found mostly in oocytes from animals with recent hormonal stimulation, suggesting a correlation with the elevated metabolism of such oocytes. Regardless of basal pH, progesterone-induced maturing oocytes alkalize an average of 0.18 pH unit. Beginning shortly before germinal vesicle breakdown, intracellular pH then decreases to near the original value. The same program is observed when maturation is induced by an injection of “maturation promoting factor.” Maturation is delayed or inhibited if intracellular pH is driven acidic. It is induced in the absence of progesterone by trimethylamine, a weak base which may act via an imposed alkalization. However, maturation still occurs when net alkalization is prevented. These data suggest that the alkalization during maturation is a form of metabolic “insurance” and that there may be both pH-dependent and pH-independent pathways for maturation. There is some evidence suggesting that pH changes are related to movement of other ions." @default.
• W1982124619 created "2016-06-24" @default.
• W1982124619 creator A5012478354 @default.
• W1982124619 creator A5017435658 @default.
• W1982124619 date "1981-07-01" @default.
• W1982124619 modified "2023-10-16" @default.
• W1982124619 title "pH changes associated with meiotic maturation in oocytes of Xenopus laevis" @default.
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• W1982124619 doi "https://doi.org/10.1016/0012-1606(81)90267-0" @default.
• W1982124619 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7021268" @default.
• W1982124619 hasPublicationYear "1981" @default.
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