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. 1986 Dec 20;5(13):3441–3447. doi: 10.1002/j.1460-2075.1986.tb04667.x

Regulation of protein kinase activities in PC12 pheochromocytoma cells.

J Blenis, R L Erikson
PMCID: PMC1167378  PMID: 3030727

Abstract

Stimulation of serine protein kinase activity (referred to as S6 kinase) occurs within minutes of addition of nerve growth factor (NGF) to PC12 rat pheochromocytoma cells. This enzyme activity is not related to the cAMP-dependent protein kinase (protein kinase A) or the Ca2+- and phospholipid-dependent protein kinase (protein kinase C), two other protein kinases potentially involved in signal transduction. Two peaks of NGF-stimulated S6 phosphotransferase activity are observed upon ion exchange chromatography; one that comigrates with the serine kinase previously described in chicken embryo fibroblasts and another with distinct elution properties. Several other factors are also found to regulate S6 phosphotransferase activity in PC12 cells including epidermal growth factor, insulin, and phorbol myristate acetate. Dibutyryl cAMP stimulates S6 phosphotransferase activity; however, this activity is strongly inhibited by the protein kinase A heat stable inhibitor. At least two mechanisms exist through which the NGF-stimulated S6 kinase activity can be regulated, one that apparently can use protein kinase C whereas the other(s) does not. The potential roles of these protein kinase activities in signal transduction and regulation of cell growth and differentiation is discussed.

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