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Potent and specific fusion toxins consisting of a HER2-binding, ABD-derived affinity protein, fused to truncated versions of Pseudomonas exotoxin A
KTH Royal Inst Technol, Dept Prot Sci, Roslagstullsbacken 21, S-11417 Stockholm, Sweden.
KTH Royal Inst Technol, Dept Prot Sci, Roslagstullsbacken 21, S-11417 Stockholm, Sweden.
KTH Royal Inst Technol, Dept Prot Sci, Roslagstullsbacken 21, S-11417 Stockholm, Sweden.
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
Vise andre og tillknytning
2019 (engelsk)Inngår i: International Journal of Oncology, ISSN 1019-6439, Vol. 55, nr 1, s. 309-319Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Fusion toxins consisting of an affinity protein fused to toxic polypeptides derived from Pseudomonas exotoxin A (ETA) are promising agents for targeted cancer therapy. In this study, we examined whether fusion toxins consisting of an albumin binding domain-derived affinity protein (ADAPT) interacting with human epidermal growth factor receptor 2 (HER2), coupled to the ETA-derived polypeptides PE38X8 or PE25, with or without an albumin binding domain (ABD) for half-life extension, can be used for specific killing of HER2-expressing cells. The fusion toxins could easily be expressed in a soluble form in Escherichia coli and purified to homogeneity. All constructs had strong affinity for HER2 (K-D 10 to 26 nM) and no tendency for aggregation could be detected. The fusion toxins including the ABD showed strong interaction with human and mouse serum albumin [equilibrium dissociation constant (K-D) 1 to 3 nM and 2 to 10 nM, respectively]. The in vitro investigation of the cytotoxic potential revealed IC50-values in the picomolar range for cells expressing high levels of HER2. The specificity was also demonstrated, by showing that free HER2 receptors on the target cells are required for fusion toxin activity. In mice, the fusion toxins containing the ABD exhibited an appreciably longer time in circulation. The uptake was highest in liver and kidney. Fusion with PE25 was associated with the highest hepatic uptake. Collectively, the results suggest that fusion toxins consisting of ADAPTs and ETA-derivatives are promising agents for targeted cancer therapy.

sted, utgiver, år, opplag, sider
2019. Vol. 55, nr 1, s. 309-319
Emneord [en]
exotoxin A, Pseudomonas, ABD-derived affinity protein, half-life extension, cancer, human epidermal growth factor receptor 2
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-392048DOI: 10.3892/ijo.2019.4814ISI: 000476557600026PubMedID: 31180549OAI: oai:DiVA.org:uu-392048DiVA, id: diva2:1349963
Forskningsfinansiär
Vinnova, 2016-04060Swedish Cancer Society, CAN 2015/746Tilgjengelig fra: 2019-09-10 Laget: 2019-09-10 Sist oppdatert: 2019-09-10bibliografisk kontrollert

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