Key Takeaways & Executive Findings
- •• • PM@CS reduces GOLPH3 and GOLM1 expression by 63.4% and 70.3%, respectively, demonstrating effective disruption of metastasis-associated protein secretion, which is critical for preventing tumor spread. • • Dendritic cell maturation (CD80+ and CD86+ populations) is increased by 3.3-fold, indicating a robust immunoadjuvant effect that enhances antigen presentation and primes adaptive immunity. • • Golgi-targeted thermal confinement minimizes heat transfer distance, overcoming the limitation of sublethal hyperthermia that causes marginal recurrence in over 60% of locally treated tumors. • • Upregulation of voltage-gated calcium channels and enhanced Ca2+ influx activate calcium signaling cascades, providing a mechanistic link between photothermal damage and amplified immunotherapy.
Abstract
Photothermal therapy (PTT) is a non-invasive tumor treatment that offers controllability, non-drug resistance, and precise ablation, yet its efficacy is limited by uncontrolled heat diffusion and weak immune responses, often leading to metastasis. Here, we report a chondroitin sulfate-modified Prussian blue-montmorillonite immunoregulator (PM@CS) that integrates tumor cell adhesion and Golgi targeting to confine photothermal damage at the organelle level. PM@CS accumulates on the Golgi apparatus, reducing heat transfer distance and enhancing photothermal ablation. This targeted hyperthermia disrupts post-translational modification and secretion of metastasis-associated proteins, with GOLPH3 and GOLM1 expression reduced by 63.4% and 70.3%, respectively. Furthermore, PM@CS promotes dendritic cell maturation (3.3-fold increase in CD80+ and CD86+ populations) and enhances antigen-specific CD4+ and CD8+ T cell proliferation, attributed to the immunoadjuvant properties of montmorillonite. Notably, PM@CS upregulates voltage-gated calcium channels (CaV) and enhances Ca2+ influx, activating calcium signaling cascades that amplify immunotherapy. This synergistic approach inhibits primary tumor growth and lung metastasis, offering a promising strategy for cancer treatment.
1. Introduction
Photothermal therapy (PTT) has emerged as a promising non-invasive cancer treatment, but its clinical translation is hindered by two fundamental bottlenecks: insufficient thermal damage due to uncontrollable heat diffusion, and weak anti-tumor immune responses that fail to prevent metastasis. Fourier's law dictates that heat flux is inversely proportional to the distance between the photothermal agent and the tumor cell, leading to sublethal hyperthermia at the periphery and subsequent tumor recurrence in over 60% of locally treated cases. Moreover, PTT alone often fails to elicit robust immunity, leaving metastatic niches unchecked. These limitations underscore the urgent need for strategies that confine photothermal damage to subcellular organelles and simultaneously boost antigen presentation.
This study addresses these challenges by engineering a chondroitin sulfate-modified Prussian blue-montmorillonite nanoregulator (PM@CS) that specifically targets the Golgi apparatus. By leveraging the tumor cell adhesion properties of montmorillonite and the Golgi-targeting capability of chondroitin sulfate, PM@CS achieves spatiotemporal thermal confinement, reducing the heat transfer distance to the nanometer scale. This precise ablation not only enhances photothermal efficacy but also disrupts the secretion of metastasis-associated proteins, while the immunoadjuvant properties of montmorillonite amplify antigen presentation and trigger calcium signaling cascades. The result is a synergistic anti-tumor and anti-metastatic effect, offering a paradigm shift in PTT design.
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XIE Weimin, LIANG Xiaozheng, LIU Qianqian, CHEN Ying, YANG Huaming (2026). Golgi-Targeted Clay Nanoregulators with Spatiotemporal Thermal Confinement and Cascade-Amplified Antigen Delivery for Tumor Therapy. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3671-0
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Frequently Asked Questions
What is the mechanism by which PM@CS achieves Golgi-specific accumulation and how does this enhance photothermal efficacy compared to non-targeted Prussian blue?
PM@CS is functionalized with chondroitin sulfate (CS), which binds to CD44 receptors overexpressed on tumor cells, facilitating receptor-mediated endocytosis and subsequent Golgi trafficking. Montmorillonite provides strong adhesion to tumor cell membranes, further enhancing cellular uptake. Once localized at the Golgi, the photothermal agent is in close proximity to the organelle, reducing the heat transfer distance (d) in Fourier's law, thereby increasing heat flux and thermal damage. This targeted approach significantly improves photothermal ablation compared to free Prussian blue, which distributes diffusely in the cytoplasm.
How does PM@CS treatment lead to a 3.3-fold increase in dendritic cell maturation, and what are the downstream effects on T cell activation?
PM@CS induces immunogenic cell death (ICD) in tumor cells, releasing tumor-associated antigens (TAAs) and damage-associated molecular patterns (DAMPs). Montmorillonite acts as an immunoadjuvant, promoting the uptake and processing of these antigens by dendritic cells (DCs). This leads to upregulation of co-stimulatory molecules CD80 and CD86, resulting in a 3.3-fold increase in mature DCs. Mature DCs then present antigens to naïve T cells, driving the proliferation of antigen-specific CD4+ and CD8+ T cells, which are essential for systemic anti-tumor immunity and metastasis suppression.
What is the significance of the reduction in GOLPH3 and GOLM1 expression (63.4% and 70.3%) in the context of metastasis?
GOLPH3 and GOLM1 are Golgi-resident proteins that regulate protein glycosylation and secretion, and their overexpression is associated with tumor metastasis. By targeting the Golgi and inducing localized hyperthermia, PM@CS disrupts the post-translational modification and trafficking of metastasis-associated proteins, leading to their reduced expression. This downregulation impairs the secretory pathway essential for tumor cell invasion and migration, thereby inhibiting metastasis. The specific reductions of 63.4% and 70.3% demonstrate a potent anti-metastatic effect at the molecular level.
How does PM@CS modulate calcium signaling, and what role does this play in the amplified immunotherapy?
PM@CS treatment upregulates voltage-gated calcium channels (CaV) and enhances Ca2+ influx into tumor cells. This increase in intracellular Ca2+ activates calcium-dependent signaling cascades, including the NFAT and NF-κB pathways, which are critical for immune cell activation. In dendritic cells, calcium signaling promotes antigen presentation and cytokine production, while in T cells, it enhances activation and proliferation. This calcium-mediated amplification of immune responses synergizes with the direct photothermal ablation and immunogenic cell death, leading to a robust anti-tumor immune response that inhibits both primary tumor growth and lung metastasis.
What are the potential scalability and translational challenges for PM@CS, and how might they be addressed?
The synthesis of PM@CS involves the modification of Prussian blue with montmorillonite and chondroitin sulfate, which may require optimization for large-scale production. Key challenges include batch-to-batch reproducibility, stability of the nanoregulator in physiological conditions, and potential off-target effects. However, the use of naturally derived materials (montmorillonite and chondroitin sulfate) and established Prussian blue chemistry suggests that scalable manufacturing is feasible. Future studies should focus on pharmacokinetics, biodistribution, and long-term toxicity in preclinical models to advance toward clinical translation.
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