Fertilization stimulates long-lasting oscillations of CaMKII activity in mouse eggs

Developmental Biology
Styliani MarkoulakiT Ducibella

Abstract

Elucidation of the biochemical mechanisms by which specific proteins transduce the all important intracellular calcium (Ca2+) signal at fertilization into events of egg activation will increase our understanding of the regulation of the onset of development and the extent to which these signals can be experimentally modified. Previously, we reported data supporting the hypothesis that mouse eggs have the capability to generate oscillations of the activity of Ca2+ and calmodulin-dependent kinase II (CaMKII), regulating the cell cycle and secretion. This study directly demonstrates transient increases of enzyme activity in relatively close synchrony with Ca2+ oscillations for the first hour of fertilization in single mouse eggs monitored for both Ca2+ and CaMKII activity. The extent of the enzyme activity increase was correlated with the level of intracellular Ca2+. After a rise in activity, the decrease in activity did not appear to be due to negative feedback from elevated Ca2+ or CaMKII activity over time, since enzyme activity persisted after 8 min of elevated Ca2+ from 7% ethanol activation. The contribution of CaMKII from a single sperm to the rise in CaMKII activity at fertilization appeared to be negligible. Also, long-te...Continue Reading

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