Small extracellular vesicles loaded with carboplatin effectively enhance the cytotoxicity of drug-resistant cells from Y79 cells-in vitro - 22/03/24
Abstract |
Drug resistance (DR) is one of the challenges in treating retinoblastoma (Rb) that warrants novel approaches. With the emerging evidence on the role of small extracellular vesicles (sEVs) as a drug-delivery carrier system, in this study, we derived the drug-resistant (DR) clones of Y79 cells and evaluated the efficacy of sEVs-loaded with carboplatin (sEVs-CPT) to reverse the chemoresistance. Drug-resistant clones of Y79 cells (DR-Y79) were systematically developed through sequential exposure to carboplatin (CPT), showcasing a sixfold increase in inhibitory concentration when compared to parental Y79 cells (IC50: 41.4 µg/mL and 6.2 µg/mL) (P<0.0001). These DR-Y79 cells show higher expression of ABCG2 and higher expression of DR genes than parental Y79 cells (P<0.0001). The sEVs were isolated from the conditioned media of Y79 cells using ultracentrifugation (UC) and characterized. Further, the sEVs were loaded with CPT and achieved higher encapsulation efficiency at one hour, and drug release of sEVs-CPT was highest at ∼80% at pH 5.0. The cytotoxicity of sEVs-CPT on Y79 cells and DR-Y79 was higher when compared to the CPT (IC50: 3.5 µg/mL vs 6.2 µg/mL; 23.1 µg/mL vs 41.2 µg/mL) (p<0.0001). This study demonstrates that sequential exposure to CPT generates DR clones of Y79 cells, which could serve as an appropriate model to evaluate the efficacy of drugs. The sEVs-CPT were highly effective in enhancing cytotoxicity in DR-Y79 cells, and appear to hold promise as a novel complimentary drug delivery system.
Le texte complet de cet article est disponible en PDF.Graphical Abstract |
Highlights |
• | Stable DR-Y79 clones were generated through sequential exposure to CPT, shows higher inhibitory concentration. |
• | sEVs were isolated from conditioned media of Y79 cells and loaded with CPT. |
• | The higher encapsulation efficiency was achieved at one hour than prolonged incubations. |
• | The sEVs-CPT has higher cytotoxicity on DR-Y79 cells than CPT. |
Abbreviations : Rb, DR, SEVs, CPT, CSC, ABCC1, and ABCG2, DRI, ETP, FE-SEM, NTA, DLS, HPLC, UV, EE, LC, PBS, DAPI, DOX, µM, µg, µMoL, MTT, DMSO, PTX
Keywords : Retinoblastoma, Small extracellular vesicles, Drug resistance, Carboplatin, Drug delivery
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Vol 173
Article 116403- avril 2024 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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