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TP53-Deficient Angiosarcoma Expression Profiling in Rat Model
Urszula Smyczyńska1, Damian Strzemecki2, Anna M Czarnecka2,3
1Department of Biostatistics and Translational Medicine, Medical University of Lodz, 92-215 Lodz, Poland.
Abstract:
Sarcomas are a heterogeneous group of malignant tumors, that develop from mesenchymal cells. Sarcomas are tumors associated with poor prognosis and expected short overall survival. Efforts to improve treatment efficacy and treatment outcomes of advanced and metastatic sarcoma patients have not led to significant improvements in the last decades. In the Tp53 rat model we therefore aimed to characterize specific gene expression pattern of angiosarcomas with a loss of TP53 function. The presence of metabolically active tumors in several locations including the brain, head and neck, extremities and abdomen was confirmed by magnetic resonance imaging (MRI) and positron emission tomography (PET) examinations. Limb angiosarcoma tumors were selected for microarray expression analysis. The most upregulated pathways in angiosarcoma vs all other tissues were related to cell cycle with mitosis and meiosis, chromosome, nucleosome and telomere maintenance as well as DNA replication and recombination. The downregulated genes were responsible for metabolism, including respiratory chain electron transport, tricarboxylic acid (TCA) cycle, fatty acid metabolism and amino-acid catabolism. Our findings demonstrated that the type of developing sarcoma depends on genetic background, underscoring the importance of developing more malignancy susceptibility models in various strains and species to simulate the study of the diverse genetics of human sarcomas.
Insights
This study in a Tp53 rat model reveals that angiosarcomas with TP53 loss exhibit upregulated cell cycle pathways and downregulated metabolism genes. These findings highlight the influence of genetic background on sarcoma development.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Sarcomas are aggressive cancers originating from mesenchymal cells, often presenting with poor prognosis.
- Advanced and metastatic sarcomas have seen limited treatment improvements over recent decades.
- Understanding sarcoma heterogeneity is crucial for developing targeted therapies.
Purpose of the Study:
- To characterize gene expression patterns in angiosarcomas with TP53 loss using a rat model.
- To identify molecular pathways associated with sarcoma development in a specific genetic context.
- To explore the role of genetic background in sarcoma type determination.
Main Methods:
- Utilized a Tp53 rat model to study angiosarcoma development.
- Employed magnetic resonance imaging (MRI) and positron emission tomography (PET) for tumor detection and characterization.
- Conducted microarray expression analysis on limb angiosarcoma tissues.
Main Results:
- Confirmed metabolically active angiosarcomas in various anatomical locations.
- Identified significant upregulation of cell cycle pathways (mitosis, meiosis) and DNA maintenance in angiosarcomas.
- Observed downregulation of metabolism-related genes, including those involved in the tricarboxylic acid (TCA) cycle and fatty acid metabolism.
Conclusions:
- TP53 loss in angiosarcomas is associated with distinct gene expression profiles favoring cell proliferation over metabolism.
- Genetic background significantly influences sarcoma development and characteristics.
- Further development of diverse malignancy models is essential to study human sarcoma genetics.
