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• W2294109597 abstract "Protein kinase C (PKC), an enzyme playing a central role in signal transduction pathways, is activated in fertilized mouse eggs downstream of the fertilization Ca2+ signal, to regulate different aspects of egg activation. Given the presence of Ca2+-independent PKC isoforms within the egg, we investigated whether fertilization triggers PKC stimulation in mouse eggs by activating Ca2+-independent signalling pathways. An increase in PKC activity was detected as early as 10 min after the beginning of insemination, when about 90% of eggs had fused with sperm and the first Ca2+ rise was evident in most of the eggs. A similar level of activity was found 20 min later, when about 60% of eggs had resumed meiosis. When the Ca2+ increase was buffered by an intracellular Ca2+ chelating agent, PKC stimulation was not blocked but only slightly reduced. Confocal microscopy analysis revealed that the increase in PKC activity at fertilization coincided with the translocation of PKCdelta, a Ca2+-independent and diacylglycerol-dependent PKC isoform, to the meiotic spindle. When, in the absence of the Ca2+ signal, metaphase-anaphase transition was inhibited, PKCdelta moved to the meiotic spindle but still maintained a sustained cytoplasmic distribution. In summary, our results indicate that: 1) PKC activation is an early event of egg activation; 2) both Ca2+-dependent and Ca2+-independent pathways contribute to increased PKC activity at fertilization; 3) PKCdelta is one of the isoforms participating in this signalling process." @default.
• W2294109597 created "2016-06-24" @default.
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• W2294109597 date "2003-06-01" @default.
• W2294109597 modified "2023-09-23" @default.
• W2294109597 title "Ca2+-independent protein kinase C signalling in mouse eggs during the early phases of fertilization." @default.
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• W2294109597 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12895027" @default.
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