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Selective targeting of metastatic ovarian cancer using an engineered anthrax prodrug activated by membrane-anchored serine proteases.


ABSTRACT: Treatments for advanced and recurrent ovarian cancer remain a challenge due to a lack of potent, selective, and effective therapeutics. Here, we developed the basis for a transformative anticancer strategy based on anthrax toxin that has been engineered to be selectively activated by the catalytic power of zymogen-activating proteases on the surface of malignant tumor cells to induce cell death. Exposure to the engineered toxin is cytotoxic to ovarian tumor cell lines and ovarian tumor spheroids derived from patient ascites. Preclinical studies demonstrate that toxin treatment induces tumor regression in several in vivo ovarian cancer models, including patient-derived xenografts, without adverse side effects, supportive of progression toward clinical evaluation. These data lay the groundwork for developing therapeutics for treating women with late-stage and recurrent ovarian cancers, utilizing a mechanism distinct from current anticancer therapies.

SUBMITTER: Duru N 

PROVIDER: S-EPMC9282395 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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Selective targeting of metastatic ovarian cancer using an engineered anthrax prodrug activated by membrane-anchored serine proteases.

Duru Nadire N   Pawar Nisha R NR   Martin Erik W EW   Buzza Marguerite S MS   Conway Gregory D GD   Lapidus Rena G RG   Liu Shihui S   Reader Jocelyn J   Rao Gautam G GG   Roque Dana M DM   Leppla Stephen H SH   Antalis Toni M TM  

Proceedings of the National Academy of Sciences of the United States of America 20220708 28


Treatments for advanced and recurrent ovarian cancer remain a challenge due to a lack of potent, selective, and effective therapeutics. Here, we developed the basis for a transformative anticancer strategy based on anthrax toxin that has been engineered to be selectively activated by the catalytic power of zymogen-activating proteases on the surface of malignant tumor cells to induce cell death. Exposure to the engineered toxin is cytotoxic to ovarian tumor cell lines and ovarian tumor spheroids  ...[more]

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