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

Logo MUG-Forschungsportal

Gewählte Publikation:

SHR Neuro Krebs Kardio Lipid

Houben, R; Dreher, C; Angermeyer, S; Borst, A; Utikal, J; Haferkamp, S; Peitsch, WK; Schrama, D; Hesbacher, S.
Mechanisms of p53 restriction in Merkel cell carcinoma cells are independent of the Merkel cell polyoma virus T antigens.
J Invest Dermatol. 2013; 133(10):2453-2460 [OPEN ACCESS]
Web of Science PubMed FullText FullText_MUG

 

Autor/innen der Med Uni Graz:
Schrama David
Gendermonitor:
Altmetrics:

Abstract:
Merkel cell carcinoma (MCC) is a rare and very aggressive skin cancer with viral etiology. The tumor-associated Merkel cell polyoma virus (MCV) belongs to a group of viruses encoding T antigens (TAs) that can induce tumorigenesis by interfering with cellular tumor-suppressor proteins like p53. To explore possible modes of p53 inactivation in MCC p53 sequencing, expression analysis and reporter gene assays for functional analyses were performed in a set of MCC lines. In one MCV-negative and one MCV-positive cell line, p53 inactivating mutations were found. In the majority of MCC lines, however, wild-type p53 is expressed and displays some transcriptional activity, which is yet not sufficient to effectively restrict cellular survival or growth in these cell cultures. Interestingly, the MCV TAs are not responsible for this critical lack in p53 activity, as TA knockdown in MCV-positive MCC cells does not induce p53 activity. In contrast, inhibition of the ubiquitin ligase HDM-2 (human double minute 2) by Nutlin-3a leads to p53 activation and p53-dependent apoptosis or cell cycle arrest in five out of seven p53 wild-type MCC lines, highlighting p53 as a potential target for future therapies of this aggressive tumor.
Find related publications in this database (using NLM MeSH Indexing)
Antigens, Viral, Tumor - genetics
Carcinoma, Merkel Cell - genetics
Cell Line, Tumor -
Gene Expression Regulation, Neoplastic -
Gene Expression Regulation, Viral -
Genes, Reporter -
Humans -
Merkel cell polyomavirus - genetics
Polyomavirus Infections - genetics
Proto-Oncogene Proteins c-mdm2 - antagonists & inhibitors
Signal Transduction - genetics
Skin Neoplasms - genetics
Transcriptional Activation - genetics
Tumor Suppressor Protein p53 - genetics
Tumor Virus Infections - genetics

© Meduni Graz Impressum