Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Koller, K; Das, S; Leuschner, I; Korbelius, M; Hoefler, G; Guertl, B.
Identification of the transcription factor HOXB4 as a novel target of miR-23a.
Genes Chromosomes Cancer. 2013; 52(8):709-715
Doi: 10.1002/gcc.22066
Web of Science
PubMed
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- Führende Autor*innen der Med Uni Graz
- Gürtl-Lackner Barbara
- Koller Karin
- Co-Autor*innen der Med Uni Graz
- Das Suman Kumar
- Höfler Gerald
- Korbelius Melanie
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- Abstract:
- The transcription factor HOXB4 not only plays a role during nephrogenesis, but displays also oncogenic characteristics in different malignant neoplasms. An in-silico analysis revealed HOXB4 as a new target of microRNA-23a (miR-23a). Nephroblastomas are malignant embryonal renal neoplasms of childhood resembling developing kidney morphologically and genetically. In our study we verified HOXB4 as a target of miR-23a and furthermore examined the expression of HOXB4 and miR-23a in nephroblastomas. We investigated binding of miR-23a to the 3'UTR of HOXB4 by a luciferase assay. Effects on protein levels of HOXB4 were analysed in Western blot experiments. Expression of HOXB4 in nephroblastomas was assessed by quantitative REALtime PCR (qRT PCR) and immunohistochemistry. The luciferase reporter assay showed a statistically significant downregulation of activity by 72,5% demonstrating direct binding of miR-23a to the 3'UTR of HOXB4. In addition, miR-23a reduced the protein expression of HOXB4 statistically significantly by 65.1%. All 21 nephroblastomas investigated had statistically significantly decreased expression levels of miR-23a. A high level of HOXB4 mRNA was found in five out of 33 nephroblastomas including mixed, blastema-type and stroma-type tumors. Protein expression of HOXB4 was stronger in 15 out of 27 nephroblastomas of all subtypes in a semiquantitative comparison to normal kidney parenchyma. Our study demonstrates for the first time the regulation of HOXB4 by miR-23a. In comparison to mature kidney, nephroblastomas had low levels of miR-23a, and in a majority of them a stronger protein expression in comparison to mature kidney was found.
- Find related publications in this database (using NLM MeSH Indexing)
- 3' Untranslated Regions -
- Apoptosis -
- Gene Expression Regulation, Neoplastic -
- Homeodomain Proteins - genetics
- Humans -
- Kidney Neoplasms - genetics
- MicroRNAs - genetics
- Transcription Factors - genetics
- Wilms Tumor - genetics