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• W2113759297 abstract "Abstract The targeting of solid tumors requires delivery tools that resist intracellular and extracellular inactivation, and that are taken up specifically by tumor cells. We have shown previously that the recombinant nontoxic B-subunit of Shiga toxin (STxB) can serve as a delivery tool to target digestive tumors in animal models. The aim of this study was to expand these experiments to human colorectal cancer. Tissue samples of normal colon, benign adenomas, colorectal carcinomas, and liver metastases from 111 patients were obtained for the quantification of the expression of the cellular STxB receptor, the glycosphingolipid globotriaosyl ceramide (Gb3 or CD77). We found that compared with normal tissue, the expression of Gb3 was strongly increased in colorectal adenocarcinomas and their metastases, but not in benign adenomas. Short-term primary cultures were prepared from samples of 43 patients, and STxB uptake was studied by immunofluorescence microscopy. Of a given tumor sample, on average, 80% of the cells could visibly bind STxB, and upon incubation at 37°C, STxB was transported to the Golgi apparatus, following the retrograde route. This STxB-specific intracellular targeting allows the molecule to avoid recycling and degradation, and STxB could consequently be detected on tumor cells even 5 days after initial uptake. In conclusion, the targeting properties of STxB could be diverted for the delivery of contrast agents to human colorectal tumors and their metastases, whose early detection and specific targeting remains one of the principal challenges in oncology. [Mol Cancer Ther 2008;7(8):2498–508]" @default.
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• W2113759297 date "2008-08-01" @default.
• W2113759297 modified "2023-10-18" @default.
• W2113759297 title "Human colorectal tumors and metastases express Gb3 and can be targeted by an intestinal pathogen-based delivery tool" @default.
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• W2113759297 doi "https://doi.org/10.1158/1535-7163.mct-08-0430" @default.
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