Key Takeaways & Executive Findings
- •• • PTX-PBA prodrug design achieved markedly enhanced drug encapsulation stability and dual-drug loading efficiency, overcoming the physicochemical incompatibility that previously limited co-delivery of PTX and immune adjuvants. • • NanoPR exhibited ROS-triggered release profiles, ensuring controlled drug release specifically in the tumor microenvironment, which is critical for minimizing systemic toxicity. • • In 4T1 breast cancer and CT26 colon carcinoma murine models, NanoPR achieved significant tumor growth inhibition and elicited durable immune memory responses, indicating potential for long-term protection against recurrence. • • The nanosystem effectively induced immunogenic cell death in tumor cells and promoted dendritic cell maturation and CD8+ T cell activation, bridging innate and adaptive immunity for a robust antitumor response.
Abstract
The synergistic strategy combining chemotherapy and immunotherapy has recently demonstrated significant promise in cancer treatment. However, the substantial physicochemical disparities between chemotherapeutic agents and small-molecule immune adjuvants pose considerable challenges for co-delivery strategies. In this study, we designed a reactive oxygen species-responsive paclitaxel prodrug, PTX-PBA, which markedly enhanced drug encapsulation stability and dual-drug loading efficiency by various polymeric delivery systems. The resultant nanosystem (NanoPR) exhibited excellent physicochemical properties and ROS-triggered release profiles, effectively inducing immunogenic cell death in tumor cells while promoting dendritic cell maturation and CD8+ T cells activation. In murine models of 4T1 breast cancer and CT26 colon carcinoma, NanoPR achieved significant tumor growth inhibition and elicited durable immune memory responses. Collectively, this work provides an innovative molecular design strategy for the co-delivery of chemotherapeutics and immunomodulators, offering a robust foundation for the clinical translation of chemo-immunotherapy.
1. Introduction
The clinical combination of paclitaxel (PTX) with immune checkpoint inhibitors has improved outcomes in aggressive cancers, yet the integration of small-molecule immune adjuvants like resiquimod (R848) remains hampered by rapid metabolic clearance, poor tissue specificity, and systemic immune overactivation. Nanocarriers offer a solution, but the stark physicochemical differences between hydrophobic PTX and adjuvants lead to low encapsulation efficiency, crystallization, and co-precipitation, undermining formulation stability and controlled release. This incompatibility has stalled the development of effective co-delivery systems, limiting the full therapeutic potential of chemo-immunotherapy.
To address this bottleneck, we engineered a hydrophobically modified PTX prodrug, PTX-PBA, which enhances compatibility with polymeric carriers and enables stable co-encapsulation of immune adjuvants. The resulting nanosystem, NanoPR, demonstrates high drug loading, ROS-responsive release, and potent immunogenic cell death induction. In murine tumor models, NanoPR achieves significant tumor inhibition and durable immune memory, providing a robust foundation for clinical translation. This molecular design strategy directly tackles the physicochemical barriers that have hindered co-delivery, offering a practical path forward for combined chemo-immunotherapy.
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Zhaofan Yang, Guanyu Jin, Lanqing Wang, Luyao Wang, Hao Liu, Haochen Yao, Mingqiang Li, Linlin Liu, Xuesi Chen, Shixian Lv (2026). Synergistic innate-adaptive chemo-immunotherapy through a high-payload nanoplatform. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3783-x
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Frequently Asked Questions
What specific physicochemical properties of PTX-PBA enable high drug loading and stability in polymeric delivery systems?
PTX-PBA is a hydrophobically modified prodrug that enhances encapsulation stability and dual-drug loading efficiency by various polymeric delivery systems. The modification likely increases hydrophobicity and reduces crystallization tendency, allowing for stable co-encapsulation with immune adjuvants like R848, which otherwise co-precipitate with PTX.
How does the ROS-responsive release profile of NanoPR ensure controlled drug delivery in the tumor microenvironment?
NanoPR is designed to be responsive to reactive oxygen species (ROS), which are elevated in tumor tissues. This triggers drug release specifically at the tumor site, minimizing systemic exposure and off-target effects. The release profile is characterized by excellent physicochemical properties and ROS-triggered release, ensuring that the therapeutic payload is delivered where needed.
What evidence supports the induction of immunogenic cell death (ICD) and subsequent immune activation by NanoPR?
The study demonstrates that NanoPR effectively induces ICD in tumor cells, as evidenced by the promotion of dendritic cell maturation and CD8+ T cell activation. In murine models of 4T1 breast cancer and CT26 colon carcinoma, NanoPR achieved significant tumor growth inhibition and elicited durable immune memory responses, indicating a robust antitumor immune response.
What are the key metrics of tumor growth inhibition and immune memory observed in the in vivo studies?
In the 4T1 and CT26 models, NanoPR achieved significant tumor growth inhibition compared to controls. The treatment also elicited durable immune memory responses, suggesting long-term protection against tumor recurrence. Specific numerical data (e.g., tumor volume reduction percentages) are not provided in the abstract, but the significance is stated.
How does the NanoPR platform address the clinical challenge of systemic toxicity associated with small-molecule immune adjuvants?
By co-encapsulating the immune adjuvant in a nanocarrier, NanoPR improves its stability and bioavailability while reducing rapid metabolic clearance and systemic immune activation. The ROS-responsive release further confines drug action to the tumor microenvironment, potentially lowering systemic toxicity and improving the therapeutic index.
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