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. 1991 May;10(5):1119–1125. doi: 10.1002/j.1460-2075.1991.tb08052.x

N-myc disrupts protein kinase C-mediated signal transduction in neuroblastoma.

R Bernards 1
PMCID: PMC452765  PMID: 1902412

Abstract

In neuroblastoma, amplification of the N-myc gene is closely correlated with increased metastatic ability. The mechanism by which N-myc acts to increase neuroblastoma malignancy is poorly understood as yet. It is shown here that transfection of N-myc in a neuroblastoma cell line causes suppression of one isoform of protein kinase C, named delta, and induction of an unusual type of protein kinase C, named zeta. N-myc-transfected neuroblastoma cells were found to be blocked in the activation of both c-fos mRNA and the NF-kappa B transcription factor by phorbol ester. Introduction of a protein kinase C expression vector in N-myc transfected neuroblastoma cells restored inducibility of both c-fos and NF-kappa B by phorbol ester. These observations indicate that changes in protein kinase C gene expression significantly alter the response of N-myc-amplified neuroblastomas to a variety of external signals.

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