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Title: Various forms of HIF-1α protein characterize the clear cell renal cell carcinoma cell lines
Authors: Monika Swiatek
Iga Jancewicz
Jakkapong Kluebsoongnoen
Renata Zub
Anna Maassen
Szymon Kubala
Apinunt Udomkit
Janusz A. Siedlecki
Tomasz J. Sarnowski
Elzbieta Sarnowska
Maria Sklodowska-Curie Institute – Oncology Center
Mahidol University
Institute of Biochemistry and Biophysics of the Polish Academy of Sciences
Keywords: Biochemistry, Genetics and Molecular Biology
Issue Date: 1-Jan-2020
Citation: IUBMB Life. (2020)
Abstract: © 2020 International Union of Biochemistry and Molecular Biology Renal cell carcinoma (RCC) represents around 2–3% of all malignancies diagnosed in adult patients. Most frequent (around 70–80% cases) and the most aggressive subtype is clear cell RCC (ccRCC). Mutations in VHL (von Hippel Lindau) gene, characteristic for this cancer type, lead to altered activity of the trimeric VBC (pVHL-elongin B-C) complex and consequently to HIF-1α stabilization. In this study, we present results of exhaustive investigation of HIF-1α alternative transcript variants abundance in A498, CAKI-1, and 786-O ccRCC cell lines. We proved the existence of truncated HIF-1α protein form (HIF1A∆-6) in A498 and HIF1A gene rearrangements in 786-O cell lines. Subsequently, we found that HIF1A∆2-6 was more stable than the full-length HIF-1α. Moreover, the shorter HIF-1α was insensitive for hypoxia and was overaccumulated after proteasome inhibitor treatment indicative of potential diversified roles of full-length and truncated HIF-1α forms in the cell. We also showed that A498, CAKI-1, and 786-O exhibit differential expression of various regulatory genes involved in the control of metabolic processes, that is, glucose and lipid metabolism, and encoding subunits of such machineries like SWI/SNF chromatin remodeling complex. Furthermore, these cell lines exhibited differential responses to axitinib, everolimus, and sunitinib—anticancer drugs—in normoxia and hypoxia as well as various alterations in metabolism-related regulatory processes. Finally, we have shown that overexpression of truncated HIF1A∆2-6 form may affect the protein level of endogenous full-length HIF-1α protein. Thus, our study proves an important role of HIF-1α in the ccRCC development.
ISSN: 15216551
Appears in Collections:Scopus 2020

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