AP-1 binding transcriptionally regulates human neutral ceramidase

Sean M. O'Neill, Kristy L. Houck, Jong K. Yun, Todd E. Fox, Mark Kester

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Many forms of cellular stress cause an elevation of endogenous ceramide levels leading to growth arrest or apoptosis. Ceramidases (CDase) play a critical role in regulating apoptosis by hydrolyzing ceramide into sphingosine, a precursor for promitogenic sphingosine-1-phosphate. Growth factor induction of neutral CDase (nCDase) has been shown to have a cytoprotective effect against cytokine-induced increases in ceramide levels. To further define the physiological regulation of nCDase, we identified a 200 bp promoter region and demonstrated that serum activated this proximal promoter, which correlated with a serum-induced increase in human nCDase mRNA expression. Computational analysis revealed a putative cis-element for AP-1, a transcription factor activated by serum. Electrophoretic mobility shift assays demonstrated that the identified transcriptional response element binds to AP-1 transcription factors. RNA interference-mediated knockdown of the AP-1 subunit, c-Jun, inhibited the activity of the human nCDase proximal promoter, whereas, c-Jun overexpression increased promoter activity, which directly correlated with human nCDase mRNA transcription, decreased ceramide mass, and protection against caspase 3/7-dependent apoptosis. Taken together, our findings suggest that c-Jun/AP-1 signaling may, in part, regulate serum-induced human nCDase gene transcription.

Original languageEnglish (US)
Pages (from-to)31-39
Number of pages9
JournalArchives of Biochemistry and Biophysics
Volume511
Issue number1-2
DOIs
StatePublished - Jul 1 2011

Fingerprint

Ceramides
Transcription Factor AP-1
Transcription
Apoptosis
Serum
Neutral Ceramidase
Ceramidases
Caspase 7
Electrophoretic mobility
Messenger RNA
Sphingosine
Response Elements
Electrophoretic Mobility Shift Assay
RNA Interference
Genetic Promoter Regions
Human Activities
Caspase 3
Assays
Intercellular Signaling Peptides and Proteins
Transcription Factors

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology

Cite this

O'Neill, Sean M. ; Houck, Kristy L. ; Yun, Jong K. ; Fox, Todd E. ; Kester, Mark. / AP-1 binding transcriptionally regulates human neutral ceramidase. In: Archives of Biochemistry and Biophysics. 2011 ; Vol. 511, No. 1-2. pp. 31-39.
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AP-1 binding transcriptionally regulates human neutral ceramidase. / O'Neill, Sean M.; Houck, Kristy L.; Yun, Jong K.; Fox, Todd E.; Kester, Mark.

In: Archives of Biochemistry and Biophysics, Vol. 511, No. 1-2, 01.07.2011, p. 31-39.

Research output: Contribution to journalArticle

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