Title:DPP-Cu2+ Complexes Gated Mesoporous Silica Nanoparticles For pH
and Redox Dual Stimuli-Responsive Drug Delivery
Volume: 30
Issue: 28
Author(s): Wei Chen, Mingyang Ma, Qingteng Lai, Yanke Zhang and Zhengchun Liu*
Affiliation:
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process, School of Physics and Electronics,
Central South University, Changsha 410083, China
- Department of Microbiology, School of Basic Medical
Science, Central South University, Changsha 410013, China
Keywords:
Mesoporous silica nanoparticles, diketopyrrolopyrrole, pH-responsive, redox-responsive, drug delivery, controlled release, gating.
Abstract:
Objective: A simple pH and redox dual stimuli-responsive diketopyrrolopyrrole
(DPP)-Cu2+ complexes gated mesoporous silica nanoparticles (MSN) were prepared
for precise drug delivery and controlled drug release.
Method: MSN was prepared by sol-gel method and then laminated. Carboxylic acid
(CA)-Pyrrolo[3,4-c] pyrrole-1,4-dione, 2,5-dihydro-3,6-di-2-pyridinyl (PyDPP) was grafted
onto the surface of amino-functionalized MSN (MSN-NH2) through a simple amide reaction
and then complexed with Cu2+ to form gated molecules after doxorubicin (DOX)
loading.
Results: Scanning electron microscopy (SEM), transmission electron microscopy
(TEM), and Low-angle X-ray diffraction (XRD) showed that MSN with uniform particle
size (100 nm) and porous structure was successfully prepared. The prepared MSN, MSN-
NH2, and MSN-DPP were fully characterized by Zeta potential, Fourier transforms infrared
spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption-
desorption. High DOX-loading capacity (18.22%) and encapsulation efficiency
(89.16%) were achieved by optimizing the mass ratio of MSN to DOX. Release studies
showed that the gated molecules of our designed DPP-Cu2+ complexes had a good blocking
effect under physiological conditions (the cumulative release rate of drugs within 24
hours was only 4.18%) and responded well to the pH and redox glutathione (GSH) dual
stimuli. In vitro cytotoxicity assay showed that MSN-DPP-Cu2+ had good biocompatibility
in both Hep G2 cells and L02 cells (the relative cell viability of both cells within 48
hours was above 97%), and the MSN-DPP-Cu2+@DOX could be triggered for efficient
drug release in Hep G2 cells.
Conclusion: The MSN-DPP-Cu2+ described in this research may be a good delivery system
for the controlled release of antitumor drugs and can provide a potential possibility
for clinical application in the future.