4.8 Article

Metal-polyphenol-network coated CaCO3as pH-responsive nanocarriers to enable effective intratumoral penetration and reversal of multidrug resistance for augmented cancer treatments

Journal

NANO RESEARCH
Volume 13, Issue 11, Pages 3057-3067

Publisher

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2972-9

Keywords

self-templated synthesis; gallic acid (GA)-Fe@calcium carbonate (CaCO3) hollow nanoparticles; reactive oxygen species (ROS) generation and chemodynamic therapy; improved intratumoral penetration; reversal of multi-drug resistance

Funding

  1. National Natural Science Foundation of China [51802209]
  2. National Research Programs from Ministry of Science and Technology (MOST) of China [2016YFA0201200]
  3. Natural Science Foundation of Jiangsu Province [BK20180848]
  4. China Postdoctoral Science Foundation [2018T110545]
  5. Collaborative Innovation Center of Suzhou Nano Science and Technology
  6. 111 Program from the Ministry of Education of China

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Construction of multifunctional stimuli-responsive nanotherapeutics enabling improved intratumoral penetration of therapeutics and reversal of multiple-drug resistance (MDR) is potent to achieve effective cancer treatment. Herein, we report a general method to synthesize pH-dissociable calcium carbonate (CaCO3) hollow nanoparticles with amorphous CaCO(3)as the template, gallic acid (GA) as the organic ligand, and ferrous ions as the metallic center via a one-pot coordination reaction. The obtained GA-Fe@CaCO(3)exhibits high loading efficiencies to both oxidized cisplatin prodrug and doxorubicin, yielding drug loaded GA-Fe@CaCO(3)nanotherapeutics featured in pH-responsive size shrinkage, drug release, and Fenton catalytic activity. Compared to nonresponsive GA-Fe@silica nanoparticles prepared with silica nanoparticles as the template, such GA-Fe@CaCO(3)confers significantly improved intratumoral penetration capacity. Moreover, both types of drug-loaded GA-Fe@CaCO(3)nanotherapeutics exhibit synergistic therapeutic efficacies to corresponding MDR cancer cells because of the GA-Fe mediated intracellular oxidative stress amplification that could reduce the efflux of engulfed drugs by impairing the mitochondrial-mediated production of adenosine triphosphate (ATP). As a result, it is found that the doxorubicin loaded GA-Fe@CaCO(3)exhibits superior therapeutic effect towards doxorubicin-resistant 4T1 breast tumors via combined chemodynamic and chemo-therapies. This work highlights the preparation of pH-dissociable CaCO3-based nanotherapeutics to enable effective tumor penetration for enhanced treatment of drug-resistant tumors.

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