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Aperta - TÜBİTAK Açık Arşivi
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Elevated hepatocyte growth factor expression as an autocrine c‐Met activation mechanism in acquired resistance to sorafenib in hepatocellular carcinoma cells

Authors: Karagonlar, Zeynep Firtina; Koc, Dogukan; Iscan, Evin; Erdal, Esra; Atabey, Nese;

Elevated hepatocyte growth factor expression as an autocrine c‐Met activation mechanism in acquired resistance to sorafenib in hepatocellular carcinoma cells

Abstract

Hepatocellular carcinoma (HCC) is the most common type of primary liver cancer and the third leading cause of cancer‐related deaths worldwide. Limitations in HCC treatment result due to poor prognosis and resistance against traditional radiotherapy and chemotherapies. The multikinase inhibitor sorafenib is the only FDA approved drug available for advanced HCC patients, and development of second‐line treatment options for patients who cannot tolerate or develop resistance to sorafenib is an urgent medical need. In this study, we established sorafenib‐resistant cells from Huh7 and Mahlavu cell lines by long‐term sorafenib exposure. Sorafenib‐resistant HCC cells acquired spindle‐shape morphology, upregulated mesenchymal markers, and showed significant increase in both migration and invasion abilities compared to their parental counterparts. Moreover, after long‐term sorafenib treatment, HCC cells showed induction of hepatocyte growth factor (HGF) synthesis and secretion along with increased levels of c‐Met kinase and its active phosphorylated form, indicating autocrine activation of HGF/c‐Met signaling. Importantly, the combined treatment of the resistant cells with c‐Met kinase inhibitor SU11274 and HGF neutralizing antibody significantly reversed the increased invasion ability of the cells. The combined treatment also significantly augmented sorafenib‐induced apoptosis, suggesting restoration of sorafenib sensitivity. These results describe, for the first time, compensatory upregulation of HGF synthesis leading to autocrine activation of HGF/c‐Met signaling as a novel cellular strategy in the acquisition of sorafenib resistance. Therefore, we suggest that combinatorial therapeutic strategies with HGF and c‐Met inhibitors comprise promising candidates for overcoming sorafenib resistance.

Keywords

Niacinamide, Sulfonamides, Carcinoma, Hepatocellular, Indoles, Hepatocyte Growth Factor, Phenylurea Compounds, Liver Neoplasms, Apoptosis, Original Articles, Proto-Oncogene Proteins c-met, Sorafenib, Antibodies, Neutralizing, Piperazines, Gene Expression Regulation, Neoplastic, Autocrine Communication, Drug Resistance, Neoplasm, Cell Line, Tumor, Humans, Cell Proliferation, Signal Transduction

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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