Reactive Oxygen Species Responsive Cleavable Hierarchical Metallic Supra-Nanostructure

Hyunjun Choi, Bongseo Choi, Jun Hyeok Han, Ha Eun Shin, Wooram Park, Dong Hyun Kim*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A reactive oxygen species (ROS) responsive cleavable hierarchical metallic supra-nanostructure (HMSN) is reported. HMSN structured with thin branches composed of primary gold (Au) nanocrystals and silver (Ag) nano-linkers is synthesized by a one-pot aqueous synthesis with a selected ratio of Au/Ag/cholate. ROS responsive degradability of HMSN is tested in the presence of endogenous and exogeneous ROS. Significant ROS-responsive structural deformation of HMSN is observed in the ROS exposure with hydrogen peroxide (H2O2) solution. The ROS responsiveness of HMSN is significantly comparable with negligible structural changes of conventional spherical gold nanoparticles. The demonstrated ROS responsive degradation of HMSN is further confirmed in various in vitro ROS conditions of each cellular endogenous ROS and exogeneous ROS generated by photodynamic therapy (PDT) or X-ray radiation. Then, in vivo ROS responsive degradability of HMSN is further evaluated with intratumoral injection of HMSN and exogeneous ROS generation via PDT in a mouse tumor model. Additional in vivo biodistribution and toxicity of intravenously administrated HMSN at 30-day post-injection are investigated for potential in vivo applications. The observed ROS responsive degradability of HMSN will provide a promising option for a type of ROS responsive-multifunctional nanocarriers in cancer treatment and various biomedical applications.

Original languageEnglish (US)
StateAccepted/In press - 2022


  • cancer therapy
  • degradable metal nanoparticles
  • degradable nanostructures
  • gold nanoparticles
  • reactive oxygen species

ASJC Scopus subject areas

  • Biotechnology
  • Chemistry(all)
  • Biomaterials
  • Materials Science(all)


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