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Efficient in vivo antitumor effect of an immunotoxin based on ribotoxin α-sarcin in nude mice bearing human colorectal cancer xenografts

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Tomé Amat, Jaime and Olombrada Sacristán, Miriam and Ruiz de la Herrán, Javier and Pérez Gómez, Eduardo and Andradas Arias, Clara and Sánchez García, Cristina and Martínez, Leopoldo and Martínez del Pozo, Alvaro and Gavilanes, José G. and Lacadena, Javier (2015) Efficient in vivo antitumor effect of an immunotoxin based on ribotoxin α-sarcin in nude mice bearing human colorectal cancer xenografts. Springerplus, 4 (168). ISSN 2193-1801

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Official URL: http://springerplus.springeropen.com/articles/10.1186/s40064-015-0943-5



Abstract

Tagging of RNases, such as the ribotoxin α-sarcin, with the variable domains of antibodies directed to surface antigens that are selectively expressed on tumor cells endows cellular specificity to their cytotoxic action. A recombinant single-chain immunotoxin based on the ribotoxin α-sarcin (IMTXA33αS), produced in the generally regarded as safe (GRAS) yeast Pichia pastoris, has been recently described as a promising candidate for the treatment of colorectal cancer cells expressing the glycoprotein A33 (GPA33) antigen, due to its high specific and effective cytotoxic effect on in vitro assays against targeted cells. Here we report the in vivo antitumor effectiveness of this immunotoxin on nude mice bearing GPA33-positive human colon cancer xenografts. Two sets of independent assays were performed, including three experimental groups: control (PBS) and treatment with two different doses of immunotoxin (50 or 100 μg/ injection) (n = 8). Intraperitoneal administration of IMTXA33αS resulted in significant dose-dependent tumor growth inhibition. In addition, the remaining tumors excised from immunotoxin-treated mice showed absence of the GPA33 antigen and a clear inhibition of angiogenesis and proliferative capacity. No signs of immunotoxin-induced pathological changes were observed from specimens tissues.Overall these results show efficient and selective cytotoxic action on tumor xenografts, combined with the lack of severe side effects, suggesting that IMTXA33αS is a potential therapeutic agent against colorectal cancer.


Item Type:Article
Uncontrolled Keywords:Immunotoxin; in vivo antitumor effectiveness; Colorectal cancer; GPA33; Ribotoxin α-sarcin
Subjects:Medical sciences > Medicine > Immunology
Medical sciences > Biology > Biochemistry
ID Code:38089
Deposited On:13 Jun 2016 10:29
Last Modified:13 Jun 2016 11:19

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