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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Estrogen modulates Ca(2+)-independent lipid-stimulated kinase in the rabbit corpus luteum of pseudopregnancy. Identification of luteal estrogen-modulated lipid-stimulated kinase as protein kinase C delta.

Rabbit corpora lutea were tested for the presence of phosphorylative responses sensitive to estrogen. Luteal Ca(2+)-independent lipid-stimulated kinase activity was detected by phosphorylation of the endogenous substrate, p76. Estrogen treatment, by way of estradiol-17 beta implant, increased levels of the lipid-stimulated phosphoprotein 2-3-fold throughout pseudopregnancy. Midpseudopregnant rabbit luteal extracts were further evaluated to determine the identity of the lipid-stimulated kinase. Results of low pH-activated phosphorylation were consistent with the identification of p76 as an autophosphorylated member of the protein kinase C (PKC) family. Partial purification of the luteal lipid-stimulated kinase was performed using sequential DEAE-cellulose/hydroxylapatite chromatographies and using gel filtration. Western immunoblot with type-specific anti-PKC delta antiserum showed coelution of kinase p76 activity with immunoreactive PKC delta. Immunoblot analysis confirmed that luteal levels of PKC delta were increased by estrogen treatment.[1]


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