Open Access

Epithelial cell adhesion molecule‑targeting designed ankyrin repeat protein‑toxin fusion Ec1‑LoPE exhibits potent cytotoxic action in prostate cancer cells

  • Authors:
    • Tianqi Xu
    • Yongsheng Liu
    • Alexey Schulga
    • Elena Konovalova
    • Sergey M. Deyev
    • Vladimir Tolmachev
    • Anzhelika Vorobyeva
  • View Affiliations

  • Published online on: March 18, 2022     https://doi.org/10.3892/or.2022.8305
  • Article Number: 94
  • Copyright: © Xu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Targeted anticancer therapeutics offer the advantage of reducing cytotoxic side effects to normal cells by directing the cytotoxic payload selectively to cancer cells. Designed ankyrin repeat proteins (DARPins) are promising non‑immunoglobulin‑based scaffold proteins for payload delivery to cancer‑associated molecular targets. Epithelial cell adhesion molecule (EpCAM) is overexpressed in 40‑60% of prostate cancers (PCs) and is associated with metastasis, increased risk of PC recurrence and resistance to treatment. Here, we investigated the use of DARPin Ec1 for targeted delivery of Pseudomonas exotoxin A variant (LoPE) with low immunogenicity and low non‑specific toxicity to EpCAM‑expressing prostate cancer cells. Ec1‑LoPE fusion protein was radiolabeled with tricarbonyl technetium‑99m and its binding specificity, binding kinetics, cellular processing, internalization and cytotoxicity were evaluated in PC‑3 and DU145 cell lines. Ec1‑LoPE showed EpCAM‑specific binding to EpCAM‑expressing prostate cancer cells. Rapid internalization mediated potent cytotoxic effect with picomolar IC50 values in both studied cell lines. Taken together, these data support further evaluation of Ec1‑LoPE in a therapeutic setting in a prostate cancer model in vivo.
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May-2022
Volume 47 Issue 5

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Xu T, Liu Y, Schulga A, Konovalova E, Deyev SM, Tolmachev V and Vorobyeva A: Epithelial cell adhesion molecule‑targeting designed ankyrin repeat protein‑toxin fusion Ec1‑LoPE exhibits potent cytotoxic action in prostate cancer cells. Oncol Rep 47: 94, 2022.
APA
Xu, T., Liu, Y., Schulga, A., Konovalova, E., Deyev, S.M., Tolmachev, V., & Vorobyeva, A. (2022). Epithelial cell adhesion molecule‑targeting designed ankyrin repeat protein‑toxin fusion Ec1‑LoPE exhibits potent cytotoxic action in prostate cancer cells. Oncology Reports, 47, 94. https://doi.org/10.3892/or.2022.8305
MLA
Xu, T., Liu, Y., Schulga, A., Konovalova, E., Deyev, S. M., Tolmachev, V., Vorobyeva, A."Epithelial cell adhesion molecule‑targeting designed ankyrin repeat protein‑toxin fusion Ec1‑LoPE exhibits potent cytotoxic action in prostate cancer cells". Oncology Reports 47.5 (2022): 94.
Chicago
Xu, T., Liu, Y., Schulga, A., Konovalova, E., Deyev, S. M., Tolmachev, V., Vorobyeva, A."Epithelial cell adhesion molecule‑targeting designed ankyrin repeat protein‑toxin fusion Ec1‑LoPE exhibits potent cytotoxic action in prostate cancer cells". Oncology Reports 47, no. 5 (2022): 94. https://doi.org/10.3892/or.2022.8305