Key Takeaways & Executive Findings
- •• • Calcium-free nanomaterials avoid off-target Ca2+ release, mitigating hypercalcemia and cardiac/renal toxicity associated with exogenous calcium salts (e.g., CaCO3, CaO2). • • These platforms precisely regulate endogenous Ca2+ channels (e.g., TRPV1) and pumps (e.g., PMCA, SERCA) to induce calcium overload, achieving targeted tumor therapy. • • The strategy triggers mitochondrial dysfunction, ER stress, and immunogenic cell death, enhancing antitumor immunity and inhibiting metastasis. • • Design principles include activation of calcium channels (e.g., via capsaicin) or inhibition of efflux pumps, with demonstrated efficacy in combination therapies (e.g., photodynamic therapy).
Abstract
Disrupting calcium ions (Ca2+) homeostasis to induce calcium overloading has emerged as a promising strategy for cancer therapy. However, calcium overloading based on exogenous calcium salts (such as calcium carbonate and calcium peroxide) can easily lead to off-target Ca2+ release, causing severe side effects such as hypercalcemia and cardiac or renal dysfunction. This review explores the calcium-free nanomaterials for mediating targeted calcium dysregulation in tumors. These nanomaterials function not by carrying Ca2+ but by precisely regulating endogenous calcium signaling pathways. They promote massive Ca2+ influx through targeted activation of calcium channels and/or inhibit Ca2+ efflux by suppressing pumps, effectively triggering intracellular calcium accumulation. Such a strategy efficiently induces mitochondrial dysfunction, endoplasmic reticulum stress, and immunogenic cell death, thereby inhibiting tumor growth and metastasis while potentiating antitumor immunity. We systematically summarize the design principles, mechanisms of action, and therapeutic applications of these calcium-free nanoplatforms, highlighting their potential to overcome the limitations of traditional therapies and boost ion-interference-based cancer treatment.
1. Introduction
Conventional cancer therapies, such as chemotherapy and radiotherapy, are often limited by drug resistance and systemic toxicity. Ion-interference therapy (IIT), which disrupts intrinsic ion homeostasis, has emerged as a novel approach. Among these, calcium overloading—artificially elevating intracellular Ca2+ to toxic levels—has shown promise. However, traditional calcium-based nanomaterials (e.g., calcium carbonate, calcium peroxide) suffer from off-target Ca2+ release, causing severe side effects like hypercalcemia and organ dysfunction. This bottleneck has hindered clinical translation.
Calcium-free nanomaterials offer a paradigm shift: they do not carry Ca2+ but instead precisely modulate endogenous calcium signaling pathways. By activating calcium channels (e.g., TRPV1) or inhibiting efflux pumps (e.g., PMCA, SERCA), they induce targeted calcium accumulation within tumors. This approach minimizes systemic toxicity and enhances therapeutic efficacy, as demonstrated in recent studies. This review systematically analyzes the design principles, mechanisms, and applications of these nanoplatforms, highlighting their potential to overcome the limitations of traditional calcium-based strategies and advance ion-interference cancer therapy.
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Jingbo Dong, Lutong Wen, Cheng Zhang, Zaifeng Chen, Qiufang Gong, Guosheng Song, Chao Liang (2026). Calcium-free nanomaterials-mediated calcium overloading for cancer therapy. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3904-6
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Frequently Asked Questions
What are the specific mechanisms by which calcium-free nanomaterials induce calcium overload without exogenous calcium?
They activate calcium channels (e.g., TRPV1) to promote Ca2+ influx or inhibit efflux pumps (e.g., PMCA, SERCA) to prevent Ca2+ extrusion, leading to intracellular accumulation. For example, capsaicin-decorated nanoparticles activate TRPV1 channels, while certain designs suppress SERCA activity.
How do calcium-free nanomaterials avoid the systemic toxicity associated with traditional calcium salts?
By not releasing exogenous Ca2+ into the bloodstream, they prevent off-target hypercalcemia and subsequent cardiac or renal dysfunction. Their action is confined to the tumor microenvironment through targeted delivery and specific activation of calcium-regulating proteins.
What downstream effects does calcium overload trigger in cancer cells?
It induces mitochondrial dysfunction, ER stress, and ROS generation, leading to apoptosis or pyroptosis. Additionally, it can trigger immunogenic cell death, releasing damage-associated molecular patterns that potentiate antitumor immunity.
Are there any clinical data or in vivo studies demonstrating the efficacy of calcium-free nanomaterials?
The review references studies such as those using capsaicin-decorated nanoparticles (Small, 2022) and dual-enzyme-instructed peptide self-assembly (ACS Nano, 2025) that show enhanced tumor inhibition and immune activation in preclinical models.
What are the scalability and manufacturing challenges for these calcium-free nanomaterials?
Challenges include reproducible synthesis of nanoplatforms with precise surface modifications, ensuring batch-to-batch consistency, and scaling up production while maintaining functionality. The review does not provide specific metrics, but these are typical hurdles in nanomedicine translation.
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