Covalent Proteins as Targeted Radionuclide Therapies Enhance Antitumor Effects.

Covalent Proteins as Targeted Radionuclide Therapies Enhance Antitumor Effects.
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DOI:
10.1021/acscentsci.3c00288
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发表时间:
2023-06-28
影响因子:
18.2
通讯作者:
Wang, Lei
Wang, Lei
中科院分区:
化学1区
文献类型:
--
作者:
Klauser, Paul C.;Chopra, Shalini;Cao, Li;Bobba, Kondapa Naidu;Yu, Bingchen;Seo, Youngho;Chan, Emily;Flavell, Robert R.;Evans, Michael J.;Wang, Lei

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Molecularly targeted radionuclide therapies (TRTs) struggle with balancing efficacy and safety, as current strategies to increase tumor absorption often alter drug pharmacokinetics to prolong circulation and normal tissue irradiation. Here we report the first covalent protein TRT, which, through reacting with the target irreversibly, increases radioactive dose to the tumor without altering the drug’s pharmacokinetic profile or normal tissue biodistribution. Through genetic code expansion, we engineered a latent bioreactive amino acid into a nanobody, which binds to its target protein and forms a covalent linkage via the proximity-enabled reactivity, cross-linking the target irreversibly in vitro, on cancer cells, and on tumors in vivo. The radiolabeled covalent nanobody markedly increases radioisotope levels in tumors and extends tumor residence time while maintaining rapid systemic clearance. Furthermore, the covalent nanobody conjugated to the α-emitter actinium-225 inhibits tumor growth more effectively than the noncovalent nanobody without causing tissue toxicity. Shifting the protein-based TRT from noncovalent to covalent mode, this chemical strategy improves tumor responses to TRTs and can be readily scaled to diverse protein radiopharmaceuticals engaging broad tumor targets. Through binding to target irreversibly, covalent nanobodies increase radioactive dose to the tumor without impairing normal tissues, inhibiting tumor growth more effectively than conventional nanobodies.
肿瘤相关酶NCEH1与共价PET探针的体内成像。
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