Abstract
While combination BRAF/MEK inhibition has improved survival in BRAFV600 mutant melanoma, targeted therapies for BRAFWT melanoma remain limited. Microphthalmia transcription factor (MITF), a lineage-specific transcription factor that regulates melanocyte proliferation and melanin synthesis, represents a promising melanoma-specific drug target. In this study, we evaluated TT-012, a recently identified MITF dimerization specific inhibitor, and surprisingly found that most BRAFWT melanoma lines were resistant to TT-012 due to low MITF transcriptional activity and reduced dependency on MITF for proliferation. High-throughput drug screen identified tivozanib, an FDA-approved drug targeting VEGFR and other receptor tyrosine kinases (RTKs), which sensitized cells to TT-012. Mechanistically, tivozanib induced cell state transition from MITFlow to MITFhigh state via VEGFR2 inhibition followed by NF-κB pathway activation, restoring MITF transcriptional activity and growth dependency. The combination of tivozanib and TT-012 synergistically inhibited melanoma growth both in vitro and in vivo, underscoring its potential as a novel therapeutic strategy for BRAFWT melanoma.
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Acknowledgements
This research was funded by the the Science and Technology Commission of Shanghai Municipality (No. YDZX20223100003007 to Wei Guo), SHIPM-mu fund (No. JC202001 to Xu-hui Ma) from Shanghai Institute of Precision Medicine, Ninth People’s Hospital Shanghai Jiao Tong University School of Medicine, National Natural Science Foundation of China (No. 82204421 to Han-lin Zeng), the SHIPM-pi fund (XK2020015 to Han-lin Zeng) from the Shanghai Institute of Precision Medicine, the Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine. This work was also supported by the Class IV Peak Disciplines (Shanghai Institute of Precision Medicine), and the Innovative Research Team of High-Level Local Universities (SHSMU-ZLCX20211700) from the Shanghai Municipal Education Commission. We gratefully acknowledge the TT-012 and TYR-luciferase plasmid provided by Dr. Wang Jing from Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences. We thank Hong Lu, Shu-fang He, Jie Huang, and all staff members of the Bioimaging Facility, and Proteomics Platform at the Shanghai Institute of Precision Medicine for providing technical support and assistance in data collection.
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HLZ, YNM, XHM, ML designed research; XHM, YZ, XYC, YJZ, WG, MJ contributed clinical samples; YNM, MLH, XYC, YNC, SNZ performed experiments; RXL, JY, MLH analyzed data; WG, XHM, HLZ acquired funding; YZ, MJ provided resources; HLZ, YNM wrote the paper; HLZ, XHM, WG, MJ supervised the research. All authors reviewed the manuscript.
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Ma, Yn., Ma, Xh., Hao, Ml. et al. Receptor tyrosine kinase inhibitor tivozanib regulates cell state plasticity and restores MITF dependency in BRAF wild-type melanoma. Acta Pharmacol Sin (2025). https://doi.org/10.1038/s41401-025-01599-3
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DOI: https://doi.org/10.1038/s41401-025-01599-3