alpha-Tocopherol increases phosphorylation of rat nuclear proteins,catalyzed by protein kinase C

alpha-Tocopherol added in vivo increased protein kinase C--dependent phosphorylation of rat liver nuclei proteins. Such effect of tocopherol was found also after the addition of sphingosine known as natural inhibitor of protein kinase C to incubation medium. The stimulation of phosphorilation was observed also after the addition of alpha-tocopherol to the Triton X-100 solubilized nuclear fraction which contained protein kinase C and tocopherol-binding proteins.