EpCAM-Binding DARPins for Targeted Photodynamic Therapy of Ovarian Cancer

Ovarian cancer is the most lethal gynecological malignancy due to late detection associated with dissemination throughout the abdominal cavity. Targeted photodynamic therapy (tPDT) aimed at epithelial cell adhesion molecule (EpCAM), overexpressed in over 90% of ovarian cancer metastatic lesions, is...

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Veröffentlicht in:Cancers 2020-07, Vol.12 (7), p.1762
Hauptverfasser: van den Brand, Dirk, van Lith, Sanne A. M., de Jong, Jelske M., Gorris, Mark A. J., Palacio-Castañeda, Valentina, Couwenbergh, Stijn T., Goldman, Mark R. G., Ebisch, Inge, Massuger, Leon F., Leenders, William P. J., Brock, Roland, Verdurmen, Wouter P. R.
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container_end_page
container_issue 7
container_start_page 1762
container_title Cancers
container_volume 12
creator van den Brand, Dirk
van Lith, Sanne A. M.
de Jong, Jelske M.
Gorris, Mark A. J.
Palacio-Castañeda, Valentina
Couwenbergh, Stijn T.
Goldman, Mark R. G.
Ebisch, Inge
Massuger, Leon F.
Leenders, William P. J.
Brock, Roland
Verdurmen, Wouter P. R.
description Ovarian cancer is the most lethal gynecological malignancy due to late detection associated with dissemination throughout the abdominal cavity. Targeted photodynamic therapy (tPDT) aimed at epithelial cell adhesion molecule (EpCAM), overexpressed in over 90% of ovarian cancer metastatic lesions, is a promising novel therapeutic modality. Here, we tested the specificity and activity of conjugates of EpCAM-directed designed ankyrin repeat proteins (DARPins) with the photosensitizer IRDye 700DX in in vitro and in vivo ovarian cancer models. EpCAM-binding DARPins (Ec1: Kd = 68 pM; Ac2: Kd = 130 nM) and a control DARPin were site-specifically functionalized with fluorophores or IRDye 700DX. Conjugation of anti-EpCAM DARPins with fluorophores maintained EpCAM-specific binding in cell lines and patient-derived ovarian cancer explants. Penetration of DARPin Ec1 into tumor spheroids was slower than that of Ac2, indicative of a binding site barrier effect for Ec1. DARPin-IRDye 700DX conjugates killed EpCAM-expressing cells in a highly specific and illumination-dependent fashion in 2D and 3D cultures. Furthermore, they effectively homed to EpCAM-expressing subcutaneous OV90 xenografts in mice. In conclusion, the high activity and specificity observed in preclinical ovarian cancer models, combined with a high specificity in patient material, warrant a further investigation of EpCAM-targeted PDT for ovarian cancer.
doi_str_mv 10.3390/cancers12071762
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M. ; de Jong, Jelske M. ; Gorris, Mark A. J. ; Palacio-Castañeda, Valentina ; Couwenbergh, Stijn T. ; Goldman, Mark R. G. ; Ebisch, Inge ; Massuger, Leon F. ; Leenders, William P. J. ; Brock, Roland ; Verdurmen, Wouter P. R.</creator><creatorcontrib>van den Brand, Dirk ; van Lith, Sanne A. M. ; de Jong, Jelske M. ; Gorris, Mark A. J. ; Palacio-Castañeda, Valentina ; Couwenbergh, Stijn T. ; Goldman, Mark R. G. ; Ebisch, Inge ; Massuger, Leon F. ; Leenders, William P. J. ; Brock, Roland ; Verdurmen, Wouter P. R.</creatorcontrib><description>Ovarian cancer is the most lethal gynecological malignancy due to late detection associated with dissemination throughout the abdominal cavity. Targeted photodynamic therapy (tPDT) aimed at epithelial cell adhesion molecule (EpCAM), overexpressed in over 90% of ovarian cancer metastatic lesions, is a promising novel therapeutic modality. 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subjects Ankyrins
Apoptosis
Cancer therapies
Cell adhesion & migration
Cell adhesion molecules
Cell culture
Chemotherapy
Epithelial cells
Explants
Flow cytometry
Fluorophores
Light
Malignancy
Metastases
Microscopy
Ovarian cancer
Photodynamic therapy
Spheroids
Tumor cell lines
Tumors
Xenografts
title EpCAM-Binding DARPins for Targeted Photodynamic Therapy of Ovarian Cancer
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