ArticleMaterials today. Advances2026
Enhanced endosomal escape for nanoparticle-enabled co-delivery of doxorubicin and siRNA to overcome multidrug resistance.
Article in Materials today. Advances, 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
Although co-delivery of small-molecule drugs and siRNAs is a promising platform strategy for combination therapy, current delivery systems fail to achieve efficient endosomal escape, limiting cytosolic siRNA bioavailability and therapeutic efficacy. Conventional lipid nanoparticles (LNPs) can co-encapsulate chemotherapeutics and siRNA, but their poor endosomal escape results in suboptimal siRNA bioavailability. Here, we report a novel type of sphere-like nanoparticle (SNP) platform for co-delivery of siRNA and small-molecule drugs that overcomes these limitations. In this system, doxorubicin (DOX) is intercalated within a Janus base nanotube (JBNt) structure, while siRNA is encapsulated through electrostatic interactions, enabling stable co-packaging. Notably, SNPs exhibit significantly enhanced endosomal escape compared with lipid nanoparticles, leveraging JBNt's endosomal escape, attributable to its distinct proton-sponge-mediated buffer capacity, consequently promoting efficient, coordinated cytosolic delivery of both cargos. In a proof-of-concept study, SNP-mediated co-delivery of Multidrug Resistance 1 gene (MDR1/ABCB1)-targeting siRNA and DOX was associated with effective gene silencing and enhanced apoptosis in cancer cells, tumor spheroids, and murine ovarian tumor xenograft models. Collectively, these findings deliver proof-of-concept evidence for SNPs as a promising co-delivery platform for RNA and chemotherapeutics to overcome chemoresistance and improve anticancer efficacy.
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