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α-sarcin and RNase T1 based immunoconjugates: the role of intracellular trafficking in cytotoxic efficiency



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Tomé-Amat, Jaime and Ruiz de la Herrán, Javier and Martínez del Pozo, Álvaro and Gavilanes, José G. and Lacadena, Javier (2015) α-sarcin and RNase T1 based immunoconjugates: the role of intracellular trafficking in cytotoxic efficiency. FEBS journal, 282 (4). pp. 673-684. ISSN 1742-4658 (Online)

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/febs.13169/full


Toxins have been thoroughly studied for their use as therapeutic agents in search of an improvement in toxic efficiency together with a minimization of their undesired side effects. Different studies have shown how toxins can follow different intracellular pathways which are connected with their cytotoxic action inside the cells. The work herein presented describes the different pathways followed by the ribotoxin a-sarcin and the fungal RNase T1,as toxic domains of immunoconjugates with identical binding domain, the single chain variable fragment of a monoclonal antibody raised against the glycoprotein A33. According to the results obtained both immunoconjugates enter the cells via early endosomes and, while a-sarcin can translocate directly into the cytosol to exert its deathly action, RNase T1 follows a pathway that involves lysosomes and the Golgi apparatus. These facts contribute to explaining the different cytotoxicity observed against their targeted cells, and reveal how the innate properties of the toxic domain, apart from its catalytic features, can be a key factor to be considered for immunotoxin optimization.

Item Type:Article
Uncontrolled Keywords:colon cancer; immunotoxin; RNase T1; trafficking; a-sarcin
Subjects:Medical sciences > Biology > Biochemistry
ID Code:38186
Deposited On:21 Jun 2016 08:23
Last Modified:23 Jun 2016 08:08

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