Biermann, Denise
(2025).
Deciphering the role of NEDD9-dependant signaling cascades in the pathophysiology of clear-cell renal cell carcinoma.
PhD thesis, Universität zu Köln.
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Abstract
The number of new cases of renal cell carcinoma (RCC) have increased steadily over the last years. However, to date, the pathogenesis and underlying deregulated pathways in RCC remain to be deciphered. In addition, biomarkers that could dictate treatment regimens and predict response to different available treatments have yet to be discovered. NEDD9 is a scaffolding protein known to interact with a multitude of oncogenic kinases in different cancer entities such as lung adenocarcinoma, breast cancer as well as leukemias among others. In most cancer entities, NEDD9 acts as a tumor driver and has been associated with poor prognosis and response to treatment. Data on the role of NEDD9 in RCC is scarce with only one research group demonstrating increased NEDD9 expression levels in RCC tissue compared to normal renal tissue and another group showing NEDD9 influencing RCC cell behavior. The aim of this work was to further elucidate the role of NEDD9 in RCC. The results show that NEDD9 leads to a more aggressive histologic phenotype in vivo in syngeneic and xenograft mouse models. In a kinome assay, NEDD9 expression is linked to the increased activity of Src family kinases in murine RCC cells and the activation of kinases belonging to the VEGF/FGF pathway in human RCC cells. This relationship has been further illuminated through gene microarray analysis. Notably, the deficiency of NEDD9 has demonstrated a substantial impact on various known oncogenic kinases and pathways. In particular, significant downregulation was observed in crucial pathways such as HIF, EGFR, VEGFR2, PDGFR and the PI3K/AKT pathway. Taken together, these findings suggest that NEDD9 acts as a molecular hub influencing the development of RCC by engaging with a spectrum of well-established oncogenic pathways. Further studies are needed to elucidate the precise interplay of NEDD9 and these signaling pathways in the pathogenesis of renal cell carcinoma, paving the way for new targeted therapies in this disease.
Item Type: | Thesis (PhD thesis) | ||||||||
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URN: | urn:nbn:de:hbz:38-750142 | ||||||||
Date: | 24 January 2025 | ||||||||
Place of Publication: | Köln | ||||||||
Language: | English | ||||||||
Faculty: | Faculty of Medicine | ||||||||
Divisions: | Faculty of Medicine > Innere Medizin > Klinik I für Innere Medizin - Hämatologie und Onkologie | ||||||||
Subjects: | Medical sciences Medicine | ||||||||
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Date of oral exam: | 29 November 2024 | ||||||||
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Refereed: | Yes | ||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/75014 |
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