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A novel photosensitizer berberine derivative B12 induces apoptosis and suppresses HIF-1α expression in colorectal cancer cells via mitochondria-to-nucleus sequential-targeting

Abstract

Photodynamic therapy (PDT) boasts the advantages of high spatiotemporal selectivity and non-invasiveness, but its clinical application is still limited by the hypoxic tumor microenvironment and inherent drawbacks of traditional photosensitizers such as aggregation-induced quenching (ACQ), insufficient targeting ability, and systemic toxicity. We previously conducted a structure-activity relationship (SAR) study on a plant-derived alkaloid, berberine, and found that its derivative B12 not only significantly enhanced antitumor efficacy but also improved water solubility and bioavailability. In this study, we characterized the photodynamic properties of B12, investigated its anticancer mechanisms, and evaluated the photodynamic therapeutic efficacy and biosafety of B12 in the tumors of xenograft mouse models. We showed that B12 was a novel photosensitizer without ACQ effect, exhibited both type I and type II photodynamic activities, and generated a large amount of reactive oxygen species (ROS) under both normoxic and hypoxic conditions. In addition, B12 (12.5, 25 μM) significantly enhanced its therapeutic effect against RKO and HCT116 cells in the hypoxic microenvironment by inhibiting the AKT/mTOR signaling pathway and downregulating the expression of hypoxia-inducible factor HIF-1α. In RKO cells, B12 (2 μM) exhibited dynamic dual-organelle-targeting properties after photoactivation: it first induced the collapse of mitochondrial membrane potential, then translocated to the nucleus and bound to DNA. It improved the intersystem crossing (ISC) efficiency by narrowing the singlet-triplet energy gap, thereby amplifying the generation of ROS and damaging DNA integrity. In mice xenografted with B16 cells, intratumoral injection of B12 (5 mg/kg) followed by 10 min light irradiation daily for 9 days significantly suppressed tumor growth with good biosafety. In conclusion, the small molecule B12 simultaneously possesses type I and type II photodynamic activities, dynamic organelle-targeting and hypoxia adaptation properties. This study may provide a reference for the research and design of hypoxia-tolerant small-molecule photosensitizers and break through the clinical bottlenecks of photodynamic therapy.

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Fig. 1: Optical properties and ROS generation of B12.
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Fig. 2: Type I photodynamic effects of B12 in RKO cells.
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Fig. 3: Evaluation of the tumor selectivity of B12.
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Fig. 4: B12 targeted mitochondria and migrated to the nucleus after light activation.
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Fig. 5: B12-induced apoptosis by impaired MMP.
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Fig. 6: B12 bound to DNA and induced DNA cleavage by light activation.
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Fig. 7: B12 alleviated intracellular hypoxia.
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Fig. 8: B12 alleviated intracellular hypoxia and induced ICD.
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Fig. 9: B12 restrained tumor growth in vivo.
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Fig. 10: Schematic diagram.
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Acknowledgements

This work was supported by grants from the National Natural Science Foundation of China (82204424, 82472651, 22471227, 22071205), Open Research Project of the Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases (Ministry of Education), Gannan Medical University (XN202005), the Scientific Research Foundation of State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory (2023XAKJ0101005), and Shenzhen Science and Technology Program (JCYJ20210324121802008, JCYJ20220530143406015).

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WBP, ZYL, and FQX performed the experiments and drafted the manuscript. PC, YCS, YSQ, JQL, QWS, MMM, CYG, JCZ, KYZ, YJX, and WQZ performed part of the experiments. WBP, ZYL, FQX, YDZ, THH, and BBX conceived the hypothesis and designed the experiments. WBP, FQX, THH, YDZ, and BBX revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yan-dong Zhang, Tian-hui Hu or Bei-bei Xu.

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Pei, Wb., Lei, Zy., Xie, Fq. et al. A novel photosensitizer berberine derivative B12 induces apoptosis and suppresses HIF-1α expression in colorectal cancer cells via mitochondria-to-nucleus sequential-targeting. Acta Pharmacol Sin 47, 1249–1269 (2026). https://doi.org/10.1038/s41401-025-01728-y

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