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Erschienen in: Cancer Immunology, Immunotherapy 9/2017

13.05.2017 | Original Article

Dianthin-30 or gelonin versus monomethyl auristatin E, each configured with an anti-calcitonin receptor antibody, are differentially potent in vitro in high-grade glioma cell lines derived from glioblastoma

verfasst von: Roger Gilabert-Oriol, Sebastian G. B. Furness, Brett W. Stringer, Alexander Weng, Hendrik Fuchs, Bryan W. Day, Angela Kourakis, Andrew W. Boyd, David L. Hare, Mayank Thakur, Terrance G. Johns, Peter J. Wookey

Erschienen in: Cancer Immunology, Immunotherapy | Ausgabe 9/2017

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Abstract

We have reported that calcitonin receptor (CTR) is widely expressed in biopsies from the lethal brain tumour glioblastoma by malignant glioma and brain tumour-initiating cells (glioma stem cells) using anti-human CTR antibodies. A monoclonal antibody against an epitope within the extracellular domain of CTR was raised (mAb2C4) and chemically conjugated to either plant ribosome-inactivating proteins (RIPs) dianthin-30 or gelonin, or the drug monomethyl auristatin E (MMAE), and purified. In the high-grade glioma cell line (HGG, representing glioma stem cells) SB2b, in the presence of the triterpene glycoside SO1861, the EC50 for mAb2C4:dianthin was 10.0 pM and for mAb2C4:MMAE [antibody drug conjugate (ADC)] 2.5 nM, 250-fold less potent. With the cell line U87MG, in the presence of SO1861, the EC50 for mAb2C4:dianthin was 20 pM, mAb2C4:gelonin, 20 pM, compared to the ADC (6.3 nM), which is >300 less potent. Several other HGG cell lines that express CTR were tested and the efficacies of mAb2C4:RIP (dianthin or gelonin) were similar. Co-administration of the enhancer SO1861 purified from plants enhances lysosomal escape. Enhancement with SO1861 increased potency of the immunotoxin (>3 log values) compared to the ADC (1 log). The uptake of antibody was demonstrated with the fluorescent conjugate mAb2C4:Alexa Fluor 568, and the release of dianthin-30:Alexa Fluor488 into the cytosol following addition of SO1861 supports our model. These data demonstrate that the immunotoxins are highly potent and that CTR is an effective target expressed by a large proportion of HGG cell lines representative of glioma stem cells and isolated from individual patients.
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Metadaten
Titel
Dianthin-30 or gelonin versus monomethyl auristatin E, each configured with an anti-calcitonin receptor antibody, are differentially potent in vitro in high-grade glioma cell lines derived from glioblastoma
verfasst von
Roger Gilabert-Oriol
Sebastian G. B. Furness
Brett W. Stringer
Alexander Weng
Hendrik Fuchs
Bryan W. Day
Angela Kourakis
Andrew W. Boyd
David L. Hare
Mayank Thakur
Terrance G. Johns
Peter J. Wookey
Publikationsdatum
13.05.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
Cancer Immunology, Immunotherapy / Ausgabe 9/2017
Print ISSN: 0340-7004
Elektronische ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-017-2013-z

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