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Potent Anticancer Activity of CXCR4-Targeted Nanostructured Toxins in Aggressive Endometrial Cancer Models
Esperanza Medina-Gutiérrez1,2, Annabel García-León1,2, Alberto Gallardo1,3
1Oncogenesis and Antitumor Drugs Group, Institut d'Investigació Biomèdica Sant Pau (IIB Sant Pau), 08041 Barcelona, Spain.
Abstract:
Patients with advanced endometrial cancer (EC) show poor outcomes. Thus, the development of new therapeutic approaches to prevent metastasis development in high-risk patients is an unmet need. CXCR4 is overexpressed in EC tumor tissue, epitomizing an unexploited therapeutic target for this malignancy. The in vitro antitumor activity of two CXCR4-targeted nanoparticles, including either the C. diphtheriae (T22-DITOX-H6) or P. aeruginosa (T22-PE24-H6) toxin, was evaluated using viability assays. Apoptotic activation was assessed by DAPI and caspase-3 and PARP cleavage in cell blocks. Both nanotoxins were repeatedly administrated to a subcutaneous EC mouse model, whereas T22-DITOX-H6 was also used in a highly metastatic EC orthotopic model. Tumor burden was assessed through bioluminescence, while metastatic foci and toxicity were studied using histological or immunohistochemical analysis. We found that both nanotoxins exerted a potent antitumor effect both in vitro and in vivo via apoptosis and extended the survival of nanotoxin-treated mice without inducing any off-target toxicity. Repeated T22-DITOX-H6 administration in the metastatic model induced a dramatic reduction in tumor burden while significantly blocking peritoneal, lung and liver metastasis without systemic toxicity. Both nanotoxins, but especially T22-DITOX-H6, represent a promising therapeutic alternative for EC patients that have a dismal prognosis and lack effective therapies.
Insights
Targeting CXCR4 with novel nanotoxins shows promise for advanced endometrial cancer (EC). These CXCR4-targeted nanoparticles effectively reduced tumor burden and metastasis in preclinical models without significant toxicity.
Area of Science:
- Oncology
- Nanotechnology
- Molecular Biology
Background:
- Advanced endometrial cancer (EC) presents poor patient outcomes, highlighting an urgent need for novel therapeutic strategies.
- CXCR4 is frequently overexpressed in EC tissues, representing a potential therapeutic target.
- Current treatment options for high-risk EC patients with metastatic potential are limited.
Purpose of the Study:
- To evaluate the in vitro and in vivo antitumor efficacy of two CXCR4-targeted nanoparticles (T22-DITOX-H6 and T22-PE24-H6) in preclinical models of endometrial cancer.
- To assess the potential of these nanotoxins to prevent or reduce metastasis in advanced EC.
- To investigate the safety and toxicity profile of the nanotoxins.
Main Methods:
- In vitro viability assays and apoptosis assessments (DAPI, caspase-3, PARP cleavage) were performed.
- Nanotoxins were administered to subcutaneous and orthotopic EC mouse models.
- Tumor burden was monitored via bioluminescence; metastasis and toxicity were evaluated using histological and immunohistochemical analyses.
Main Results:
- Both nanotoxins demonstrated significant in vitro and in vivo antitumor activity by inducing apoptosis.
- Repeated administration of T22-DITOX-H6 in a metastatic EC model markedly reduced tumor burden and inhibited peritoneal, lung, and liver metastasis.
- No significant off-target toxicity was observed in any of the treated animal models.
Conclusions:
- CXCR4-targeted nanotoxins, particularly T22-DITOX-H6, show potent therapeutic potential against advanced endometrial cancer.
- These nanotoxins represent a promising alternative therapy for EC patients with poor prognoses and limited treatment options.
- The observed efficacy in reducing metastasis and lack of systemic toxicity warrant further clinical investigation.
