Dual-Responsive Nanoparticles for Prodrug Activation and Copper-Dependent Cell Death
- 1School of Medical Technology and Engineering, Fujian Health College, Fuzhou 350101, China
- 2College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China
- 3Department of Pathology, Guangzhou Medical University, Guangzhou 510182, China
Abstract
Cuproptosis represents a promising strategy for cancer therapy. Generating copper diethyldithiocarbamate (Cu(DTC)2) directly at tumor sites may enhance copper-dependent antitumor activity; however, inefficient precursor loading and premature release may limit local Cu(DTC)2 formation and increase off-target toxicity. To overcome these challenges, a reactive oxygen species (ROS)-responsive, thioketal-linked dopamine dimer (DTD) and an H2O2-responsive DTC prodrug (DQ) were co-assembled and subsequently coated with a copper–tannic acid (Cu@TA) network to form CDD nanoparticles (CDD NPs). The DQ-loading capacity and stimulus responsiveness of CDD NPs were characterized, and their in vitro anticancer activity was evaluated in 4T1 cells. DTD promoted DQ loading and linked the core to the copper network through catechol coordination. DTD-free CD NPs contained only 57.3% of the DQ in CDD NPs and had a lower Cu(I) fraction. Copper release from the Cu@TA network was limited under physiological conditions but increased in an acidic environment, whereas H2O2 triggered DQ cleavage, supporting the proposed in situ formation of Cu(DTC)2. In 4T1 cells, CDD NPs induced oxidative stress, glutathione depletion, and apoptosis. Intracellular copper accumulation, partial rescue by tetrathiomolybdate, and changes in ferredoxin 1 (FDX1) and dihydrolipoamide S-acetyltransferase (DLAT) suggested possible cuproptosis involvement. CDD NPs improved prodrug loading and controlled precursor release, inhibiting tumor cells in vitro.
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BibTeX
@article{you2026dualresponsive,
title = {{Dual-Responsive Nanoparticles for Prodrug Activation and Copper-Dependent Cell Death}},
author = {Changwen You and Yongming Wang and Qihong Zhang and Liyin Ye and Xinhong Wang and Zhenfei Peng},
journal = {Nanomaterials},
year = {2026},
month = oct,
doi = {10.3390/nano16201301},
url = {https://www.mdpi.com/2079-4991/16/20/1301},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Dual-Responsive Nanoparticles for Prodrug Activation and Copper-Dependent Cell Death
AU - Changwen You
AU - Yongming Wang
AU - Qihong Zhang
AU - Liyin Ye
AU - Xinhong Wang
AU - Zhenfei Peng
PY - 2026
DA - 2026/10/14
JO - Nanomaterials
DO - 10.3390/nano16201301
UR - https://www.mdpi.com/2079-4991/16/20/1301
AB - Cuproptosis represents a promising strategy for cancer therapy. Generating copper diethyldithiocarbamate (Cu(DTC)2) directly at tumor sites may enhance copper-dependent antitumor activity; however, inefficient precursor loading and premature release may limit local Cu(DTC)2 formation and increase off-target toxicity. To overcome these challenges, a reactive oxygen species (ROS)-responsive, thioketal-linked dopamine dimer (DTD) and an H2O2-responsive DTC prodrug (DQ) were co-assembled and subsequently coated with a copper–tannic acid (Cu@TA) network to form CDD nanoparticles (CDD NPs). The DQ-loading capacity and stimulus responsiveness of CDD NPs were characterized, and their in vitro anticancer activity was evaluated in 4T1 cells. DTD promoted DQ loading and linked the core to the copper network through catechol coordination. DTD-free CD NPs contained only 57.3% of the DQ in CDD NPs and had a lower Cu(I) fraction. Copper release from the Cu@TA network was limited under physiological conditions but increased in an acidic environment, whereas H2O2 triggered DQ cleavage, supporting the proposed in situ formation of Cu(DTC)2. In 4T1 cells, CDD NPs induced oxidative stress, glutathione depletion, and apoptosis. Intracellular copper accumulation, partial rescue by tetrathiomolybdate, and changes in ferredoxin 1 (FDX1) and dihydrolipoamide S-acetyltransferase (DLAT) suggested possible cuproptosis involvement. CDD NPs improved prodrug loading and controlled precursor release, inhibiting tumor cells in vitro.
SN - 2079-4991
ER -