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Implantation and Monitoring by PET/CT of an Orthotopic Model of Human Pleural Mesothelioma in Athymic Mice
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Implantation and Monitoring by PET/CT of an Orthotopic Model of Human Pleural Mesothelioma in Athymic Mice

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microRNAs are differentially regulated between MDM2-positive and negative malignant pleural mesothelioma

Robert Fred Henry Walter1,2, Claudia Vollbrecht3,4, Robert Werner2

  • 1Ruhrlandklinik, West German Lung Centre, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.

Oncotarget
|February 27, 2016
PubMed
Abstract

Insights

MicroRNA (miRNA) expression is altered in malignant pleural mesothelioma (MPM) tumors, particularly in those expressing MDM2. These changes in miRNA, especially those affecting TP53 signaling, may offer new therapeutic targets for MPM.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Malignant pleural mesothelioma (MPM) is an aggressive cancer treated with cisplatin and pemetrexed.
  • MDM2 and P14/ARF (CDKN2A) regulate TP53, a key tumor suppressor.
  • The role of microRNA (miRNA) expression in these regulatory pathways in MPM is not fully understood.

Purpose of the Study:

  • To investigate the impact of miRNA expression on the MDM2/P14/ARF/TP53 axis in MPM.
  • To identify specific miRNAs that are deregulated in MPM based on MDM2 expression levels.

Main Methods:

  • Analysis of miRNA expression in 24 formalin-fixed paraffin-embedded MPM specimens using the NanoString nCounter technique.
  • Identification of significantly deregulated miRNAs and pathway analysis (KEGG).

Main Results:

  • Significant downregulation of miRNAs targeting TP53, MDM2, and CDKN2A was observed in MDM2-expressing MPM.
  • TP53 was downregulated via specific miRNAs in MDM2-negative tumors, alongside alterations in RB1, MDM2, and CDKN2A expression.

Conclusions:

  • MDM2 expression influences miRNA profiles in MPM, with notable decreases in TP53-signaling miRNAs in MDM2-positive tumors.
  • Understanding these miRNA-mediated regulatory mechanisms could lead to novel therapeutic strategies for MPM patients.
Keywords:
MDM2NanoString nCountermicroRNApleural mesothelioma

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