Colonization of engineered bacteria enhanced lipid nanomedicine accumulation in tumors for sonodynamic immunotherapy

作者：Ying Xu, Xiaojun Cai, Jianrong Wu, Yuanyi Zheng, Yaotai Wang · 发表于：Materials Today Bio · 年份：2025 · DOI：10.1016/j.mtbio.2025.101943 · 被引用次数：2 · 研究领域：Cancer Research and Treatments、Nanoplatforms for cancer theranostics、3D Printing in Biomedical Research

Lipid nanoparticles (LNPs) possess liver-targeting properties that increase drug accumulation in liver cancer cells, thereby mitigating drug resistance and systemic toxicity. However, critical limitations such as off-target effects, rapid clearance, and poor specificity hinder their clinical translation. Inspired by the tumor-targeting ability of bacteria, we constructed a multifunctional engineered bacteria system combining LNPs with probiotics by electrostatic adsorption. Specifically, the surface of Bifidobacterium longum (BL) was modified with sorafenib-loaded LNPs (designated PSI LNPs), enabling precise delivery of lipid nanomedicines to tumor sites. Meanwhile, ultrasound irradiation facilitated drug release within the tumor and improved efficacy. On the one hand, we used fluorescence imaging to observe and monitor live-engineered bacteria. Compared to the single PSI LNPs group, the tumor accumulation of lipid nanomedicines loaded with engineered bacteria exhibited a 66% increase. The results demonstrated that the engineered bacteria not only augmented the accumulation of nanomedicines within the tumor but also prolonged the retention time for a sustained effect on the tumor. On the other hand, we further explored synergistic immune system activation by Bifidobacterium and sonodynamic therapy, which stimulated dendritic cell maturation, T cell infiltration, and CD8 + T cell activation. In conclusion, this delivery strategy of engineered bacteria targeting the tumor micro...