ArticleInternational journal of molecular sciences2026
Differential Effects of Mesenchymal Stem Cell- and Natural Killer Cell-Derived Extracellular Vesicles on Cisplatin Responsiveness in Endometrial Cancer Cells.
Article in International journal of molecular sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Cisplatin (cis-diamminedichloroplatinum(II) [DDP]) is a key chemotherapeutic agent for advanced endometrial cancer; however, chemoresistance substantially limits its clinical benefit. Extracellular vesicles (EVs) mediate intercellular communication and influence tumour cell behaviour and therapeutic response. We investigated whether mesenchymal stem cell-derived extracellular vesicles (MSC-EVs) and natural killer cell-derived extracellular vesicles (NK-EVs) modulate cisplatin responsiveness in endometrial cancer cells (RL95-2 and HEC-1A). MSC-EVs and NK-EVs were isolated and characterised using nanoparticle tracking analysis, scanning electron microscopy, and EV marker profiling. MSC-EVs and NK-EVs reduced RL95-2 and HEC-1A cell viability in a dose-dependent manner, with MSC-EVs exhibiting substantial effects at lower particle concentrations. In a cisplatin-resistant HEC-1A (HEC-1A DDP-R) model, MSC-EVs were associated with greater reductions in cell viability under cisplatin treatment conditions, whereas NK-EVs showed comparatively modest effects. Mechanistic analyses demonstrated altered expression of apoptosis- and cell cycle-related proteins, including increased cleaved poly(ADP-ribose) polymerase and cleaved caspase-3 levels and reduced cyclin A and cyclin D1 expression following MSC-EV treatment. Annexin V-fluorescein isothiocyanate/propidium iodide flow cytometry demonstrated increased apoptotic cell populations after MSC-EV treatment, with MSC-EV + DDP co-treatment resulting in the highest apoptotic fraction in chemoresistant HEC-1A cells. Collectively, these findings indicate that MSC-EVs are associated with altered cellular responses to cisplatin in chemoresistant endometrial cancer cells, accompanied by changes in apoptosis-related protein expression, apoptotic cell populations, and cell-cycle regulators. Further investigation is required to determine their mechanistic role and therapeutic potential in overcoming chemoresistance.
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