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The treatment of PC12 cells with either nerve growth factor or phorbol 12-myristate 13-acetate caused a decrease in the phosphorylation of a soluble 100-kDa protein (Nsp100). After treatment with nerve growth factor, the activity of Ca2+/phospholipid-dependent protein kinase (protein kinase C) in the cytosol was increased. When the cytosol from untreated PC12 cells was preincubated with purified protein kinase C and its cofactors, the phosphorylation of Nsp100 was decreased. The preincubation of cytosol from nerve growth factor-treated PC12 cells with protein kinase C did not decrease Nsp100 phosphorylation further. Moreover, preincubation of partially purified Nsp100 kinase with protein kinase C decreased its ability to phosphorylate Nsp100. These results suggest that the binding of nerve growth factor to its receptor on PC12 cells causes an increase in the activity of protein kinase C in the cytosol and phosphorylation of Nsp100 kinase, which in turn lowers its ability to phosphorylate Nsp100.

Protein kinase C as a component of a nerve growth factor-sensitive phosphorylation system in PC12 cells.