Jumonji inhibitors overcome radioresistance in cancer through changes in H3K4 methylation at double-strand breaks
We have uncovered a role for Jumonji inhibitors in overcoming radioresistance through KDM5B inhibition. Pharmacological blockade of Jumonji demethylases with JIB-04 leads to specific accumulation of H3K4me3 at sites marked by γH2AX and impaired recruitment of DNA repair factors, preventing resolutio...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
October 23, 2018
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| In: |
Cell reports
Year: 2018, Volume: 25, Issue: 4, Pages: 1040-1050,e1-e5 |
| ISSN: | 2211-1247 |
| DOI: | 10.1016/j.celrep.2018.09.081 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.celrep.2018.09.081 Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S2211124718315419 
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| Author Notes: | Juan Bayo, Tram Anh Tran, Lei Wang, Samuel Peña-Llopis, Amit K. Das, and Elisabeth D. Martinez |
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| 520 | |a We have uncovered a role for Jumonji inhibitors in overcoming radioresistance through KDM5B inhibition. Pharmacological blockade of Jumonji demethylases with JIB-04 leads to specific accumulation of H3K4me3 at sites marked by γH2AX and impaired recruitment of DNA repair factors, preventing resolution of damage and resulting in robust sensitization to radiation therapy. In DNA-repair-proficient cancer cells, knockdown of the H3K4me3 demethylase KDM5B, but not other Jumonji enzymes, mimics pharmacological inhibition, and KDM5B overexpression rescues this phenotype and increases radioresistance. The H3K4me3 demethylase inhibitor PBIT also sensitizes cancer cells to radiation, while an H3K27me3 demethylase inhibitor does not. In vivo co-administration of radiation with JIB-04 significantly prolongs the survival of mice with tumors even long after cessation of treatment. In human patients, lung squamous cell carcinomas highly expressing KDM5B respond poorly to radiation. Thus, we propose the use of Jumonji KDM inhibitors as potent radiosensitizers. | ||
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