Tailor-Made Cell-Based Biomimetic Nanoprobes for Fluorescence Imaging Guided Colorectal Cancer Chemo-immunotherapy.

Colorectal cancer has become one of the malignant tumors with a high rate of morbidity and mortality. Therefore, how to effectively treat colorectal cancer is crucial. Although nanodelivery system has been applied to the therapy of colorectal cancer, the majority of existing nanodelivery systems still have drawbacks such as low biocompatibility and poor targeting ability. In this work, tailor-made cell-based biomimetic nanoplatform was prepared to enhance the targeting and therapeutic effect for colorectal cancer chemo-immunotherapy. First, hollow long persistence luminescence nanomaterials were synthesized with superior background-free bioimaging effect and high drug-loading content. After loaded with cisplatin, the nanoplatform was camouflaged with tailor-made erythrocyte and programmed cell death receptor 1 (PD-1) expressed hybrid cell membrane. In vivo animal imaging experiment showed that the nanoplatform camouflaged with hybrid cell membrane not only had excellent immune escapability but also had excellent tumor active targeting ability. In vivo anticancer experiments showed that combined chemotherapy and immunotherapy of the nanoplatform could significantly inhibit tumor growth in tumor-bearing mice. In summary, the tailor-made cell-based membrane camouflage produced excellent immune escapability and cancer active targeting ability, providing a modality for biomimetic nanodelivery systems.