Abstract
Radiotherapy resistance is a major obstacle to nasopharyngeal carcinoma (NPC) therapy and contributes to tumour recurrence and metastasis. Lipid metabolism is a key regulatory mechanism in cancer biology; however, its role in NPC radiotherapy resistance remains unclear. In this study, we identified hypoxia-inducible lipid droplet-associated protein (HILPDA) as a newly discovered regulator of radioresistance that induces not only lipid droplet (LD) formation but also intracellular lipid remodelling, notably changing mitochondrial cardiolipin (CL) levels. Additionally, we found that the upregulation of CL promotes mitophagy in response to irradiation exposure. Mechanistically, HILPDA inhibits PINK1-mediated CLS1 ubiquitination and degradation. The combination of a mitophagy inhibitor and irradiation significantly increases the radiosensitivity of NPC cells. Human cancer-derived data confirmed that the HILPDA-CLS1 pathway promotes NPC radioresistance. Collectively, these findings suggest that HILPDA plays a critical role in promoting NPC radioresistance and might be targeted to overcome radiotherapeutic resistance in NPC patients in the clinic.
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Acknowledgements
We gratefully acknowledge Dr. Wei Guo from the College of Pharmacy, Third Military Medical University (Army Medical University) for her kind help in providing EGFP-LC3 and RFP-Mito plasmids.
Funding
This work was supported in part by grants from the National Natural Science Foundation of China, including 81874072 (H.L.) and 81772647 (H.L.); Chongqing Science and Technology Commission 4139Z2395(H.L.).
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JO, GX and HL designed the study and wrote the paper. YZ, CP and CZ performed the experiments. YW, PW, YC, JW, YH and CL analysed the data. JO, GX, YZ and CP revised the manuscript. All authors contributed to this manuscript. All authors had full access to the data and approved the final version of the manuscript.
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The experimental protocol was established according to the ethical guidelines of the 1964 Declaration of Helsinki. The protocol for IHC staining of patient tissues was approved by the Ethics Committee of the First Affiliated Hospital (Southwest Hospital), the Third Military Medical University (Army Medical University), and all patients or family members involved provided written informed consent.
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Zhang, Y., Pang, C., Zhang, C. et al. HILPDA-mediated lipidomic remodelling promotes radiotherapy resistance in nasopharyngeal carcinoma by accelerating mitophagy. Cell. Mol. Life Sci. 80, 242 (2023). https://doi.org/10.1007/s00018-023-04891-9
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DOI: https://doi.org/10.1007/s00018-023-04891-9