Abstract:
:HOX homeobox proteins are key oncogenic drivers in hematopoietic malignancies. Here we demonstrate that HOXA1, HOXA6 and predominantly HOXA9 are able to induce the production of insulin-like growth factor 1 (Igf1). In chromatin immunoprecipitations, HOXA9 bound directly to the putative promoter and a DNase-hypersensitive region in the first intron of the Igf1 gene. Transcription rates of the Igf1 gene paralleled HOXA9 activity. Primary cells transformed by HOXA9 expressed functional Igf1 receptors and activated the protein kinase Akt in response to Igf1 stimulation, suggesting the existence of an autocrine signaling loop. Genomic deletion of the Igf1 gene by Cre-mediated recombination increased sensitivity toward apoptosis after serum starvation. In addition, the leukemogenic potential of Igf1-negative, HOXA9-transformed cells was impaired, leading to a significant delay in disease development on transplantation into recipient animals.
journal_name
Leukemiajournal_title
Leukemiaauthors
Steger J,Füller E,Garcia-Cuellar MP,Hetzner K,Slany RKdoi
10.1038/leu.2014.287subject
Has Abstractpub_date
2015-04-01 00:00:00pages
901-8issue
4eissn
0887-6924issn
1476-5551pii
leu2014287journal_volume
29pub_type
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