Abstract
Bcl-xL is a well-characterized target gene of cancer. DT2216, a selective proteolysis-targeting chimera (PROTAC) has been developed for targeting Bcl-xL without causing pronounced thrombocytopenia. However, like most PROTACs, DT2216 has its intrinsic limitations such as low permeability, poor solubility, low bioavailability, and nonspecific biological distribution. In this study, a novel nanoliposome (NP)-encapsulated DT2216 (DT@NPs) was developed and the anti-cancer effects and safety of DT@NPs in vitro and in vivo were assessed. The DT@NPs had notable cytocompatibility in normal cells and good bioavailability in cancer cells. Compared with DT2216, DT@NPs exhibited an enhanced ability to degrade Bcl-xL in two cervical cancer cell lines (C33A and SiHa) and a triple-negative breast cancer cell line (MDA-MB-231), resulting in notably enhanced cytotoxicity for cancer cells, in particular, for MDA-MB-231. The apoptosis, colony formation, and wound healing assays showed that DT@NPs had a stronger effect on inducing apoptosis, suppressing colony formation, and inhibiting cellular migration than DT2216. Moreover, a notable inhibition of DT@NPs on tumor growth was observed in the tumor-bearing murine model. A high accumulation of Cy5-labeled DT@NPs in the tumor indicated that DT@NPs had a good biodistribution in vivo. DT@NPs showed stronger inhibition of tumor growth than DT2216 by enhancing the Bcl-xL degradation and apoptosis. The comprehensive safety assessments in histology, blood cell count, and the biochemical indicators of peripheral blood suggested that DT@NPs showed no appreciable on-target toxicities and side effects. In conclusion, nanoliposomal Bcl-xL targeted PROTAC enhanced anti-cancer effects on cervical and breast cancer without causing on-target toxicities.
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Funding
This study was supported by the National Natural Science Foundation of China (No. 81974463 and No. 81974409).
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Jiaming Zhang: conceptualization, data curation, formal analysis, visualization, and writing– review & editing; Baofang Zhang: investigation, data curation, software, and writing – original draft; Congli Pu: resources and supervision; Jiarui Cui: visualization; Kexin Huang: resources and supervision; Hongbo Wang: supervision, data curation, and funding acquisition; Yingchao Zhao: conceptualization, project administration, supervision, resources, funding acquisition, data curation, and writing – review & editing. All authors approved the final manuscript.
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42114_2023_649_MOESM1_ESM.tif
Supplementary file1 FigureS1. DT2216 and DT@NPs induce Bcl-xL degradation in time- and dose-dependent manners. (A) Western analyses of the expression of Bcl-xL in C33A, SiHa, and MDA-MB-231 cells treated with various doses of DT2216 for 24, 48, and 72 h. (B)Western analyses of the expression of Bcl-xL in C33A, SiHa, and MDA-MB-231cells treated with DT2216 (3 μM) for 24, 48, and 72 h. (C) Western analyses ofthe expression of Bcl-xL in C33A, SiHa, and MDA-MB-231 cells treated withvarious doses of DT@NPs for 24, 48, and 72 h. NPs indicate the blanknanoliposomal particles. (D) Western analyses of the expression of Bcl-xL inC33A, SiHa, and MDA-MB-231 cells treated with DT@NPs (1 μM) for 24, 48, and 72h. (TIF 1942 KB)
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Supplementary file2 FigureS2. Histological analyses of the effects of DT2216 and DT@NPs on major organs. Hematoxylin–Eosin (HE) staining of the major organs of the SiHa or MDA-MB-231 tumor-bearing BALB/c nude mice treated with PBS, NPs, DT2216 (12.5 mg per kgbody weight, q4d, i.v.) or DT@NPs (12.5 mg per kg body weight, q4d, i.v.). (TIF 49839 KB)
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Supplementary file3 FigureS3. Whole blood cell counts and hemoglobin levels of peripheral blood in SiHa or MDA-MB-231 tumor-bearing BALB/c nude mice treated with PBS, NPs, DT2216, orDT@NPs. WBC, white blood cell; LYM, lymphocyte; HGB, hemoglobin; RBC, red bloodcell (TIF 476 KB)
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Supplementary file4 Figure S4. Biochemical indicators of peripheral blood in SiHa or MDA-MB-231 tumor-bearing BALB/c nude mice treated with PBS, NPs, DT2216, or DT@NPs. ALT, alanine aminotransferase; AST, aspartateaminotransferase; BUN, blood urea nitrogen; CR, serum creatinine (TIF 470 KB)
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Zhang, J., Zhang, B., Pu, C. et al. Nanoliposomal Bcl-xL proteolysis-targeting chimera enhances anti-cancer effects on cervical and breast cancer without on-target toxicities. Adv Compos Hybrid Mater 6, 78 (2023). https://doi.org/10.1007/s42114-023-00649-w
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DOI: https://doi.org/10.1007/s42114-023-00649-w