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rdf:type |
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lifeskim:mentions |
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pubmed:issue |
4
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pubmed:dateCreated |
2010-3-31
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pubmed:abstractText |
Capsaicin, a natural product of the Capsicum species of red peppers, is known to induce apoptosis and suppress growth. Non-steroidal anti-inflammatory drug-activated gene-1 (NAG-1) is a cytokine associated with pro-apoptotic and antitumorigenic property in colorectal and lung cancer. Our data demonstrate that capsaicin leads to induction of apoptosis and up-regulates NAG-1 gene expression at the transcriptional level. Overexpression of CCAAT/enhancer binding protein beta (C/EBPbeta) caused a significant increase of basal and capsaicin-induced NAG-1 promoter activity. We subsequently identified C/EBPbeta binding sites in the NAG-1 promoter responsible for capsaicin-induced NAG-1 transactivation. Electrophoretic mobility shift assay and chromatin immunoprecipitation assay confirmed binding of C/EBPbeta to the NAG-1 promoter. Capsaicin treatment resulted in an increase of phosphorylated serine/threonine residues on C/EBPbeta, and the immunoprecipitation study showed that capsaicin enhanced binding of C/EBPbeta with glycogen synthase kinase 3beta (GSK3beta) and activating transcription factor 3 (ATF3). The phosphorylation and interaction of C/EBPbeta with GSK3beta and ATF3 are decreased by the inhibition of the GSK3beta and Protein Kinase C pathways. Knockdown of C/EBPbeta, GSK3beta or ATF3 ameliorates NAG-1 expression induced by capsaicin treatment. These data indicate that C/EBPbeta phosphorylation through GSK3beta may mediate capsaicin-induced expression of NAG-1 and apoptosis through cooperation with ATF3 in human colorectal cancer cells.
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pubmed:grant |
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pubmed:commentsCorrections |
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/ATF3 protein, human,
http://linkedlifedata.com/resource/pubmed/chemical/Activating Transcription Factor 3,
http://linkedlifedata.com/resource/pubmed/chemical/CCAAT-Enhancer-Binding Protein-beta,
http://linkedlifedata.com/resource/pubmed/chemical/Capsaicin,
http://linkedlifedata.com/resource/pubmed/chemical/GDF15 protein, human,
http://linkedlifedata.com/resource/pubmed/chemical/Glycogen Synthase Kinase 3,
http://linkedlifedata.com/resource/pubmed/chemical/Growth Differentiation Factor 15,
http://linkedlifedata.com/resource/pubmed/chemical/Protein Kinase C,
http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Retinoic Acid,
http://linkedlifedata.com/resource/pubmed/chemical/glycogen synthase kinase 3 beta,
http://linkedlifedata.com/resource/pubmed/chemical/retinoic acid receptor alpha
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pubmed:status |
MEDLINE
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pubmed:month |
Apr
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pubmed:issn |
1460-2180
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pubmed:author |
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pubmed:issnType |
Electronic
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pubmed:volume |
31
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
719-28
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pubmed:dateRevised |
2011-11-2
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pubmed:meshHeading |
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