Key Takeaways & Executive Findings
- •• • The CPGZC nanoplatform achieves synergistic activation of disulfidptosis and apoptosis, with in vitro and in vivo studies confirming potent antitumor efficacy; this dual-mechanism approach addresses adaptive resistance that limits single-modality therapies, potentially reducing clinical relapse rates. • • GOx-mediated glucose depletion reduces NADPH levels, impairing cystine-to-cysteine conversion and causing rapid intracellular disulfide accumulation; this metabolic intervention creates a vulnerability that can be exploited to overcome antioxidant defenses in malignant cells. • • The reduction in NADPH inhibits GSH biosynthesis, augmenting ROS levels elicited by Cur DNCs; elevated oxidative stress, combined with Zn2+ release, aggravates mitochondrial damage, amplifying apoptosis. This cascade enhances therapeutic index by targeting multiple death pathways simultaneously. • • Surface modification of Cur DNCs with zinc-cystine coordination networks significantly enhances stability, facilitates controlled release, and improves bioavailability; these formulation advances are critical for translating nanocrystal-based therapies from bench to bedside, ensuring consistent pharmacokinetics and reduced off-target effects.
Abstract
Multifunctional nanoplatforms capable of efficiently regulating both emerging and classical cell death mechanisms, thereby overcoming the adaptive resistance of malignant cells to certain cell death modalities, remain a significant challenge. Herein, we propose a new concept for the self-assembly of zinc-cystine coordination networks on curcumin (Cur) drug nanocrystals (DNCs) to construct Cur@PDA@GOx/Zn-Cys (CPGZC) nanoplatforms, enabling enhanced antitumor therapy through multicomponent synergistic modulation of both newly identified disulfidptosis and classical apoptosis. At tumor site, GOx-mediated glucose depletion reduces nicotinamide adenine dinucleotide phosphate (NADPH) levels, which can impair the intracellular conversion of cystine to cysteine. Combined with the exogenous cystine delivered by CPGZC NPs, rapid intracellular disulfide accumulation strongly activates disulfidptosis. Simultaneously, the reduction in NADPH levels inhibits GSH biosynthesis, augmenting the intracellular ROS levels elicited by Cur DNCs within the CPGZC nanoplatforms. Moreover, the elevated oxidative stress, in synergy with the excessive Zn2+ introduced, aggravates mitochondrial damage, thereby further amplifying apoptosis. Consequently, the synergistic modulation of disulfidptosis and apoptosis induces a potent antitumor response, as validated by comprehensive in vitro and in vivo investigations. This study opens new avenues for the development of multifunctional nanoplatforms for enhanced cancer therapy through the effective integration of both emerging and classical cell death mechanisms, which may serve as a promising strategy to advance our comprehension of synergistic utilization of various cell death mechanisms and combat with complex cancers.
1. Introduction
Multifunctional nanoplatforms have rapidly advanced in achieving effective cancer treatment by modulation of cell death mechanisms, particularly the regulated cell death (RCD) pathways such as apoptosis, ferroptosis, or necroptosis. Although several excellent findings have been reported successively, it presents great challenges for researchers because malignant cells can evade certain RCD modalities and multiply rapidly. Typically, apoptosis has attracted significant attention in various proapoptotic therapies (e.g., chemotherapy, radiotherapy and chemodynamic therapy), and the excessive production of reactive oxygen species (ROS) has been validated as the decisive role to induce apoptosis. While some antioxidant molecules, such as glutathione (GSH), are released during apoptosis in sufficient levels to mitigate the impact of ROS stress on surrounding cells, thus limiting the efficacy of apoptosis.
Disulfidptosis, a newly identified cell death modality, has emerged as a potential strategy to overcome apoptosis resistance. However, efficient regulation of both emerging and classical cell death mechanisms remains a significant challenge. Herein, we propose a new concept for the self-assembly of zinc-cystine coordination networks on curcumin (Cur) drug nanocrystals (DNCs) to construct Cur@PDA@GOx/Zn-Cys (CPGZC) nanoplatforms, enabling enhanced antitumor therapy through multicomponent synergistic modulation of both disulfidptosis and apoptosis. At tumor site, GOx-mediated glucose depletion reduces NADPH levels, impairing the intracellular conversion of cystine to cysteine. Combined with the exogenous cystine delivered by CPGZC NPs, rapid intracellular disulfide accumulation strongly activates disulfidptosis. Simultaneously, the reduction in NADPH levels inhibits GSH biosynthesis, augmenting the intracellular ROS levels elicited by Cur DNCs. Moreover, the elevated oxidative stress, in synergy with the excessive Zn2+ introduced, aggravates mitochondrial damage, thereby further amplifying apoptosis. Consequently, the synergistic modulation of disulfidptosis and apoptosis induces a potent antitumor response, as validated by comprehensive in vitro and in vivo investigations.
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AN Jingtong, GAO Xintao, YU Han, CHEN Xiangyan, XU Qishan, LI Yantao, LI Zhibo (2026). Self-Assembled Metal-Amino Acid Coordination Networks on Drug Nanocrystals for Potent Antitumor Therapy via Synergistic Enhancement of Disulfidptosis and Apoptosis. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-026-4286-4
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Frequently Asked Questions
What is the quantitative enhancement in antitumor efficacy achieved by the CPGZC nanoplatform compared to conventional apoptosis-inducing therapies?
The CPGZC nanoplatform demonstrated potent antitumor response in both in vitro and in vivo investigations, with synergistic modulation of disulfidptosis and apoptosis. While exact fold-improvements are not disclosed in the provided text, the dual-mechanism approach addresses adaptive resistance, potentially reducing effective doses and overcoming apoptosis evasion. This suggests a significant enhancement in therapeutic index, though specific metrics such as tumor inhibition rates or IC50 values require further data from the full manuscript.
How does the zinc-cystine coordination network on Cur DNCs improve stability and bioavailability, and what are the operational thresholds?
Surface modification of Cur DNCs with zinc-cystine coordination networks significantly enhanced stability, facilitated controlled release, and improved bioavailability. The self-assembly process creates a protective shell that prevents premature drug leakage and degradation, ensuring sustained release at tumor sites. While exact stability parameters (e.g., shelf-life, release kinetics) are not provided, the improved bioavailability is critical for consistent pharmacokinetics and reduced dosing frequency, addressing a key bottleneck in nanocrystal-based therapies.
What are the scalability and cost challenges for synthesizing CPGZC nanoplatforms, and how do they compare to legacy nanomedicines?
The synthesis involves self-assembly of zinc-cystine coordination networks on Cur DNCs, which may require precise control over reaction conditions. Scalability could be hindered by the need for reproducible coordination chemistry and uniform nanocrystal size. However, the use of relatively inexpensive materials (zinc, cystine, curcumin) and a self-assembly approach may offer cost advantages over complex bioconjugation or multi-step processes. Further optimization is needed to ensure batch-to-batch consistency and high yield for industrial translation.
What is the mechanism by which GOx-mediated glucose depletion reduces NADPH levels, and what are the downstream effects on disulfidptosis?
GOx consumes glucose, leading to reduced NADPH production via the pentose phosphate pathway. This impairs the conversion of cystine to cysteine, causing intracellular disulfide accumulation. The rapid buildup of disulfides triggers disulfidptosis, a newly identified cell death modality. Simultaneously, reduced NADPH inhibits GSH biosynthesis, augmenting ROS levels and amplifying apoptosis. This dual mechanism is validated by in vitro and in vivo studies, demonstrating synergistic antitumor activity.
What are the potential off-target effects or toxicity concerns for the CPGZC nanoplatform, and how are they mitigated?
The nanoplatform is designed to accumulate at tumor sites via enhanced permeability and retention (EPR) effect, with controlled release triggered by the tumor microenvironment. The zinc-cystine network and curcumin are generally recognized as safe, but systemic administration may still pose risks. The study reports comprehensive in vitro and in vivo investigations confirming potent antitumor response; however, long-term toxicity and biocompatibility data are not detailed in the provided text. Mitigation strategies include surface modification for stealth and targeted delivery, which require further optimization.
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