Transcription and signalling pathways involved in BCR-ABL-mediated misregulation of 24p3 and 24p3R
Document Type
Journal ArticlePublication Date
2009-02-21Keywords
AnimalsCore Binding Factor Alpha 2 Subunit
Down-Regulation
Female
Fusion Proteins, bcr-abl
Humans
Lipocalins
Male
Mice
Mice, Inbred Strains
Mice, SCID
Piperazines
Promoter Regions, Genetic
Proto-Oncogene Proteins p21(ras)
Pyrimidines
Receptors, Cell Surface
*Signal Transduction
*Transcription, Genetic
Genetics and Genomics
Metadata
Show full item recordAbstract
Lipocalin 24p3 is a secreted protein that can induce apoptosis in cells containing the 24p3 cell surface receptor, 24p3R. The oncoprotein BCR-ABL activates 24p3 and represses 24p3R expression. Thus, BCR-ABL(+) cells synthesise and secrete 24p3, which induces apoptosis in normal 24p3R-containing cells but not in BCR-ABL(+) cells. The cell signalling and transcription factor pathways by which BCR-ABL misregulates expression of 24p3 and 24p3R remain to be elucidated. Here we show that BCR-ABL upregulates 24p3 expression through activation of the JAK/STAT pathway, which culminates in binding of Stat5 to the 24p3 promoter. We find that 24p3R expression is regulated by Runx transcription factors, and that BCR-ABL induces a switch in binding from Runx3, an activator of 24p3R expression, to Runx1, a repressor of 24p3R expression, through a Ras signalling pathway. Finally, we show that repression of 24p3R by BCR-ABL is a critical feature of the mechanism by which imatinib kills BCR-ABL(+) cells. Our results reveal diverse signalling/transcription pathways that regulate 24p3 and 24p3R expression in response to BCR-ABL and are directly relevant to the treatment of BCR-ABL(+) disease.Source
EMBO J. 2009 Apr 8;28(7):866-76. Epub 2009 Feb 19. Link to article on publisher's siteDOI
10.1038/emboj.2009.35Permanent Link to this Item
http://hdl.handle.net/20.500.14038/44107PubMed ID
19229297Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1038/emboj.2009.35