Abstract:
:Deregulation of E2F1 activity and resistance to TGFbeta are hallmarks of gastric cancer. MicroRNAs (miRNAs) are small noncoding RNAs frequently misregulated in human malignancies. Here we provide evidence that the miR-106b-25 cluster, upregulated in a subset of human gastric tumors, is activated by E2F1 in parallel with its host gene, Mcm7. In turn, miR-106b and miR-93 regulate E2F1 expression, establishing a miRNA-directed negative feedback loop. Furthermore, upregulation of these miRNAs impairs the TGFbeta tumor suppressor pathway, interfering with the expression of CDKN1A (p21(Waf1/Cip1)) and BCL2L11 (Bim). Together, these results suggest that the miR-106b-25 cluster is involved in E2F1 posttranscriptional regulation and may play a key role in the development of TGFbeta resistance in gastric cancer.
journal_name
Cancer Celljournal_title
Cancer cellauthors
Petrocca F,Visone R,Onelli MR,Shah MH,Nicoloso MS,de Martino I,Iliopoulos D,Pilozzi E,Liu CG,Negrini M,Cavazzini L,Volinia S,Alder H,Ruco LP,Baldassarre G,Croce CM,Vecchione Adoi
10.1016/j.ccr.2008.02.013subject
Has Abstractpub_date
2008-03-01 00:00:00pages
272-86issue
3eissn
1535-6108issn
1878-3686pii
S1535-6108(08)00049-4journal_volume
13pub_type
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