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Related Experiment Video

Updated: Jun 27, 2026

Induction of Invasive Transitional Cell Bladder Carcinoma in Immune Intact Human MUC1 Transgenic Mice: A Model for Immunotherapy Development
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Induction of Invasive Transitional Cell Bladder Carcinoma in Immune Intact Human MUC1 Transgenic Mice: A Model for Immunotherapy Development

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Immunotoxin WPD101a as a Potential Drug Candidate for Targeted Therapy in Muscle Invasive Bladder Cancer Expressing

Aleksandra Klimczak1, Agnieszka Krawczenko1, Sandra Stamnitz1

  • 1Laboratory of Biology of Stem and Neoplastic Cells, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland.

International Journal of Molecular Sciences
|June 26, 2026
PubMed
Summary

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This study shows WPD101a immunotoxin effectively targets interleukin-13 receptor subunit alpha 2 (IL-13Rα2) expressing bladder cancer cells, inducing apoptosis and inhibiting growth. This offers a promising therapeutic strategy for muscle invasive bladder cancer (MIBC).

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Muscle invasive bladder cancer (MIBC) therapy often fails due to tumor heterogeneity and resistance.
  • Interleukin-13 receptor subunit alpha 2 (IL-13Rα2) is a potential therapeutic target as it is expressed on bladder cancer cells but not normal urothelial cells.

Purpose of the Study:

  • To investigate the therapeutic efficacy of WPD101a immunotoxin against IL-13Rα2-expressing bladder cancer (BC) cells.
  • To evaluate the impact of WPD101a on BC cell phenotype, viability, proliferation, and apoptosis in vitro using 2D and 3D models.

Main Methods:

  • Assessed IL-13Rα2 expression using flow cytometry, immunofluorescence, and Western blot.
  • Evaluated WPD101a's biological effects on cell viability, proliferation (MTT, SRB, CellTiter-Glo, Live/Dead assays), and apoptosis (Annexin V/PI staining, qRT-PCR of CASP genes).
Keywords:
IL-13Rα2MIBCbladder cancerimmunotoxininterleukin 13 receptor subunit alpha 2muscle-invasive bladder cancertargeted therapy

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Last Updated: Jun 27, 2026

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  • Utilized both 2-dimensional (2D) and 3-dimensional (3D) cell culture models.
  • Main Results:

    • BC cell lines TCC-SUP, JMSU-1, and UM-UC-3 expressed IL-13Rα2, while RT-4, HCV-29, and 5637 did not.
    • WPD101a demonstrated sensitivity at lower concentrations (0.1 ng/mL) in 2D models versus 3D models (1.0 ng/mL) for IL-13Rα2-expressing cells.
    • IL-13Rα2-negative cells remained resistant; WPD101a induced apoptosis and inhibited growth in IL-13Rα2-positive cells, confirmed by cell cycle analysis and CASP gene expression.

    Conclusions:

    • WPD101a exhibits receptor-dependent cytotoxic effects specifically against IL-13Rα2-expressing bladder cancer cells.
    • The immunotoxin effectively inhibits growth and induces apoptosis in MIBC cells, highlighting its potential as a targeted therapy.
    • WPD101a demonstrates specificity and efficacy, offering a novel therapeutic avenue for bladder cancer treatment.