iRGD-reinforced, photo-transformable nanoclusters toward cooperative enhancement of intratumoral penetration and antitumor efficacy
intratumoral penetration, light-responsiveness, singlet oxygen-degradable polymer, size shrinkage, charge conversion, iRGD
Insufficient intratumoral penetration greatly hurdles the anticancer performance of nanomedicine. To realize highly efficient tumor penetration in a precisely and spatiotemporally controlled manner, far-red light-responsive nanoclusters (NCs) capable of size shrinkage and charge conversion were developed and co-administered with iRGD to synergistically improve the intratumoral penetration and the anticancer efficacy. The NCs were constructed using the singlet oxygen-sensitive (SOS) polyethylene glycolpolyurethane-polyethylene glycol (PEG-(1O2)PU-PEG) triblock copolymer to encapsulate the doxorubicin (DOX)-loaded, chlorin e6 (Ce6)-conjugated polyamindoamine (PAMAM) dendrimer (DCD) via the double-emulsion method. Co-administration of iRGD notably increased the permeability of NCs within tumor vasculature and tumor tissues. In addition, upon far-red light irradiation (660 nm) of tumors at low optical density (10 mW/cm2), the generated 1O2 could disintegrate the NCs and release the DCD with positive surface charge and ultra-small size (~ 5 nm), which synergized with iRGD to enable deep intratumoral penetration. Consequently, the local 1O2 at lethal concentrations along with the released DOX efficiently and cooperatively eradicated tumor cells. This study provides a convenient approach to spatiotemporally promote the intratumoral penetration of nanomedicine and mediate programmed anticancer therapy.
Tsinghua University Press
Jing Yan,Rongying Zhu,Fan Wu,Ziyin Zhao,Huan Ye,Mengying Hou,Yong Liu,Lichen Yin, iRGD-reinforced, photo-transformable nanoclusters toward cooperative enhancement of intratumoral penetration and antitumor efficacy. NanoRes.2020, 13(10): 2706–2715