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. 1995 Jun 20;92(13):5885–5889. doi: 10.1073/pnas.92.13.5885

Sphingosylphosphocholine, a signaling molecule which accumulates in Niemann-Pick disease type A, stimulates DNA-binding activity of the transcription activator protein AP-1.

A Berger 1, D Rosenthal 1, S Spiegel 1
PMCID: PMC41606  PMID: 7597047

Abstract

Sphingosylphosphocholine (SPC) is the deacylated derivative of sphingomyelin known to accumulate in neuropathic Niemann-Pick disease type A. SPC is a potent mitogen that increases intracellular free Ca2+ and free arachidonate through pathways that are only partly protein kinase C-dependent. Here we show that SPC increased specific DNA-binding activity of transcription activator AP-1 in electrophoretic mobility-shift assays. Increased DNA-binding activity of AP-1 was detected after only 1-3 min, was maximal after 6 hr, and remained elevated at 12-24 hr. c-Fos was found to be a component of the AP-1 complex. Northern hybridization revealed an increase in c-fos transcripts after 30 min. Since the increase in AP-1 binding activity preceded the increase in c-fos mRNA, posttranslational modifications may be important in mediating the early SPC-induced increases in AP-1 DNA-binding activity. Western analysis detected increases in nuclear c-Jun and c-Fos proteins following SPC treatment. SPC also transactivated a reporter gene construct through the AP-1 recognition site, indicating that SPC can regulate the expression of target genes. Thus, SPC-induced cell proliferation may result from activation of AP-1, linking signal transduction by SPC to gene expression. Since the expression of many proteins with diverse functions is known to be regulated by AP-1, SPC-induced activation of AP-1 may contribute to the pathophysiology of Niemann-Pick disease.

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