Engineering hybrid nanoparticles for targeted codelivery of triptolide and <i>CYP3A4</i>-siRNA against pulmonary metastatic melanoma.

Abstract

Pulmonary metastatic melanoma (PMM) is an aggressive malignancy with limited response and rapid resistance to clinical chemotherapy, radiotherapy, immunotherapy, and biological therapies. Here, we developed a targeted biomimetic drug delivery system, TP-siRC@tHyNPs, by fusing exosomes derived from engineered cells overexpressing DR5 single-chain variable fragments (DR5-Exo) with liposomes coencapsulating triptolide (TP) and CYP3A4-siRNA (TP-siRC@Lip). DR5-Exo facilitated the targeted delivery of drug to tumor cells through DR5 receptor recognition and simultaneously activated apoptotic pathways. Moreover, CYP3A4-siRNA effectively prolonged the half-life of TP, thereby enhancing its antiproliferative and pro-apoptotic effects. Mechanistic studies revealed that TP-siRC@tHyNPs induced immunogenic cell death, reprogrammed macrophage polarization, arrested cell cycle progression, and triggered apoptotic pathways. In vivo experiments demonstrated that TP-siRC@tHyNPs specifically accumulated in lung tissue, notably inhibiting the growth of PMM while exhibiting negligible toxicity in tumor-bearing mice. Overall, this study provides a promising strategy for targeting PMM treatment, improving therapeutic efficacy while reducing off-target toxicity.