Abstract
Purpose
Sunitinib is a recommended drug for metastatic renal cell carcinoma (RCC). However, the therapeutic potential of sunitinib is impaired by toxicity and resistance. Therefore, we seek to explore a combinatorial strategy to improve sunitinib efficacy of low-toxicity dose for better clinical application.
Methods
We screen synergistic reagents of sunitinib from a compound library containing 1374 FDA-approved drugs by in vitro cell viability evaluation. The synergistically antiproliferative and proapoptotic effects were demonstrated on in vitro and in vivo models. The molecular mechanism was investigated by phosphoproteomics, co-immunoprecipitation, immunofluorescence and western-blot assays, etc.
Results
From the four-step screening, nilotinib stood out as a potential synergistic killer combined with sunitinib. Subsequent functional evaluation demonstrated that nilotinib and sunitinib synergistically inhibit RCC cell proliferation and promote apoptosis in vitro and in vivo. Mechanistically, nilotinib activates E3-ligase HUWE1 and in combination with sunitinib renders MCL-1 for degradation via proteasome pathway, resulting in the release of Beclin-1 from MCL-1/Beclin-1 complex. Subsequently, Beclin-1 induces complete autophagy flux to promote antitumor effect.
Conclusion
Our findings revealed that a novel mechanism that nilotinib in combination with sunitinib overcomes sunitinib resistance in RCC. Therefore, this novel rational combination regimen provides a promising therapeutic avenue for metastatic RCC and rationale for evaluating this combination clinically.
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Data availability
All data are available within the article, supplementary information, or available from the corresponding author upon reasonable request.
Abbreviations
- AXL:
-
AXL receptor tyrosine kinase
- BCL-2:
-
BCL2 apoptosis regulator
- BCL-XL:
-
Apoptosis regulator Bcl-X
- c-Kit:
-
Stem cell growth factor receptor Kit
- FDA:
-
Food and drug administration
- FLT-3:
-
Fms related receptor tyrosine kinase 3
- HBSS:
-
Hanks’ balance salt solution
- HUWE1:
-
HECT, UBA and WWE domain containing E3 ubiquitin protein ligase 1
- IP:
-
Immunoprecipitation
- IF:
-
Immunofluorescence
- LC3:
-
Microtubule associated protein 1 light chain 3 alpha
- MCL-1:
-
Myeloid cell leukemia 1
- MET:
-
Tyrosine-protein kinase Met
- mTORC1:
-
Mammalian target of rapamycin complex 1
- PDGFR:
-
Platelet-derived growth factor receptor
- PFS:
-
Progression free survival
- RCC:
-
Renal cell carcinoma
- TKI:
-
Tyrosine kinase inhibitor
- USP9X:
-
Ubiquitin specific peptidase 9 X-linked
- VEGFR:
-
Vascular endothelial growth factor receptor
- WB:
-
Western blot
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Funding
This project was supported by the National Natural Science Foundation of China (NSFC) (No. 82172812 to R.L. and No. 82272743 to X.Y.), The Natural Science Foundation of Guangdong Province (No. 2022A1515012321 to H.H. and No. 2021A1515012496 to X.Y.), The Enterprise United Foundation of Guangdong Province (No. 2021A1515220182 to H.H.).
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Study concept and design: X.Y., R.L. and H.H.; Performed in vitro functional studies and analyzed data: T.L., X.C. and X.Y.; Performed animal experiments and analyzed data: T.L., R.Y. and C.W.; Generated critical cellular tools: T.L. and X.C.; Performed mechanistical studies and analyzed data: T.L., X.Y., X.C. and Y.L.; Statistic analysis: T.L. and X.Y.; Supervision of data: X.B.; Analysis and interpretation of data and writing of the manuscript: T.L., X.Y., R.L, and H.H. All authors have read and approved the manuscript.
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Liu, T., Yue, X., Chen, X. et al. Nilotinib in combination with sunitinib renders MCL-1 for degradation and activates autophagy that overcomes sunitinib resistance in renal cell carcinoma. Cell Oncol. (2024). https://doi.org/10.1007/s13402-024-00927-9
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DOI: https://doi.org/10.1007/s13402-024-00927-9