Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz

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Ortega, M; Bhatnagar, H; Lin, AP; Wang, L; Aster, JC; Sill, H; Aguiar, RC.
A microRNA-mediated regulatory loop modulates NOTCH and MYC oncogenic signals in B- and T-cell malignancies.
Leukemia. 2015; 29(4):968-976 [OPEN ACCESS]
Web of Science PubMed PUBMED Central FullText FullText_MUG

 

Autor/innen der Med Uni Graz:
Sill Heinz
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Number of Figures: 5
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Abstract:
Growing evidence suggests that microRNAs (miRNAs) facilitate the cross-talk between transcriptional modules and signal transduction pathways. MYC and NOTCH1 contribute to the pathogenesis of lymphoid malignancies. NOTCH induces MYC, connecting two signaling programs that enhance oncogenicity. Here we show that this relationship is bidirectional and that MYC, via a miRNA intermediary, modulates NOTCH. MicroRNA-30a (miR-30a), a member of a family of miRNAs that are transcriptionally suppressed by MYC, directly binds to and inhibits NOTCH1 and NOTCH2 expression. Using a murine model and genetically modified human cell lines, we confirmed that miR-30a influences NOTCH expression in a MYC-dependent fashion. In turn, through genetic modulation, we demonstrated that intracellular NOTCH1 and NOTCH2, by inducing MYC, suppressed miR-30a. Conversely, pharmacological inhibition of NOTCH decreased MYC expression and ultimately de-repressed miR-30a. Examination of genetic models of gain and loss of miR-30a in diffuse large B-cell lymphoma (DLBCL) and T-acute lymphoblastic leukemia (T-ALL) cells suggested a tumor-suppressive role for this miRNA. Finally, the activity of the miR-30a-NOTCH-MYC loop was validated in primary DLBCL and T-ALL samples. These data define the presence of a miRNA-mediated regulatory circuitry that may modulate the oncogenic signals originating from NOTCH and MYC.
Find related publications in this database (using NLM MeSH Indexing)
Animals -
B-Lymphocytes - metabolism
B-Lymphocytes - pathology
Gene Expression Regulation, Neoplastic -
Genes, Reporter -
Humans -
Luciferases - genetics
Luciferases - metabolism
Lymphoma, Large B-Cell, Diffuse - genetics
Lymphoma, Large B-Cell, Diffuse - metabolism
Lymphoma, Large B-Cell, Diffuse - pathology
Male -
Mice -
Mice, Inbred C57BL -
Mice, Transgenic -
MicroRNAs - genetics
MicroRNAs - metabolism
Precursor Cell Lymphoblastic Leukemia-Lymphoma - genetics
Precursor Cell Lymphoblastic Leukemia-Lymphoma - metabolism
Precursor Cell Lymphoblastic Leukemia-Lymphoma - pathology
Primary Cell Culture -
Proto-Oncogene Proteins c-myc - genetics
Proto-Oncogene Proteins c-myc - metabolism
Receptor, Notch1 - genetics
Receptor, Notch1 - metabolism
Receptor, Notch2 - genetics
Receptor, Notch2 - metabolism
Signal Transduction -
T-Lymphocytes - metabolism
T-Lymphocytes - pathology

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