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The main bottleneck in the development of deliverable protein materials is the lysosomal degradation that follows endosome maturation. This is especially disappointing in the case of receptor-targeted protein constructs, which, while being highly promising and in demand in precision medicines, enter cells via endosomal\/lysosomal routes. In the search for suitable protein agents that might promote endosome escape, we have explored the translocation domain (TD) of the diphtheria toxin as a functional domain in CXCR4-targeted oligomeric nanoparticles designed for cancer therapies. The pharmacological interest of such protein materials could be largely enhanced by improving their proteolytic stability. The incorporation of TD into the building blocks enhances the amount of the material detected inside of exposed CXCR4+ cells up to around 25-fold, in absence of cytotoxicity. This rise cannot be accounted for by endosomal escape, since the lysosomal degradation of the new construct decreases only moderately. On the other hand, a significant loss in the specificity of the CXCR4-dependent cellular penetration indicates the unexpected role of the toxin segment as a cell-penetrating peptide in a dose-dependent and receptor-independent fashion. These data reveal that the diphtheria toxin TD displayed on receptor-targeted oligomeric nanoparticles partially abolishes the exquisite receptor specificity of the parental material and it induces nonspecific internalization in mammalian cells.<\/jats:p>","DOI":"10.3390\/pharmaceutics14122644","type":"journal-article","created":{"date-parts":[[2022,11,30]],"date-time":"2022-11-30T04:05:24Z","timestamp":1669781124000},"page":"2644","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["The Diphtheria Toxin Translocation Domain Impairs Receptor Selectivity in Cancer Cell-Targeted Protein Nanoparticles"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0017-8274","authenticated-orcid":false,"given":"Eric","family":"Volt\u00e0-Dur\u00e1n","sequence":"first","affiliation":[{"name":"Institut de Biotecnologia i de Biomedicina, Universitat Aut\u00f2noma de Barcelona, Bellaterra, 08193 Barcelona, Spain"},{"name":"CIBER de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), Instituto de Salud Carlos III, Bellaterra, 08193 Barcelona, Spain"},{"name":"Departament de Gen\u00e8tica i de Microbiologia, Universitat Aut\u00f2noma de Barcelona, Bellaterra, 08193 Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julieta M.","family":"S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Institut de Biotecnologia i de Biomedicina, Universitat Aut\u00f2noma de Barcelona, Bellaterra, 08193 Barcelona, Spain"},{"name":"CIBER de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), Instituto de Salud Carlos III, Bellaterra, 08193 Barcelona, Spain"},{"name":"Departament de Gen\u00e8tica i de Microbiologia, Universitat Aut\u00f2noma de Barcelona, Bellaterra, 08193 Barcelona, Spain"},{"name":"Instituto de Investigaciones Biol\u00f3gicas y Tecnol\u00f3gicas (IIBYT), CONICET-Universidad Nacional de C\u00f3rdoba, Av. 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