Author(s): Zhao FK, Chuang LF, Israel M, Chuang RY
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Abstract Cremophor EL, a castor oil derivative, has been considered a non-toxic solubilizer for lipophilic drugs and vitamins. Protein kinase C, a phospholipid/Ca++-dependent protein kinase, is known to phosphorylate, in response to extracellular stimuli, a variety of proteins for cellular functions. The present study shows that Cremophor EL selectively inhibits the activity of protein kinase C in vitro. The potency of this selective inhibition is greater than that of other protein kinase C-specific inhibitor thus far reported. Cremophor EL acts primarily on the enzyme activator diacylglycerol (or the phorbol ester) and prevents the latter from both interacting with the phospholipid and binding to protein kinase C. This is the first report of a significant biological activity induced by this widely used substituted castor oil solubilizer.
This article was published in Biochem Biophys Res Commun
and referenced in Journal of Analytical & Bioanalytical Techniques