Controlled-temperature photothermal and oxidative bacteria killing and acceleration of wound healing by polydopamine-assisted Au-hydroxyapatite nanorods

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xiaomo Xu
  • Xiangmei Liu
  • Lei Tan
  • Zhenduo Cui
  • Xianjin Yang
  • Shengli Zhu
  • Zhaoyang Li
  • Xubo Yuan
  • Yufeng Zheng
  • Kelvin Wai Kwok Yeung
  • Shuilin Wu

Detail(s)

Original languageEnglish
Pages (from-to)352-364
Journal / PublicationActa Biomaterialia
Volume77
Online published17 Jul 2018
Publication statusPublished - 1 Sep 2018

Abstract

Since skin wounds are subject to bacterial infection and tissue regeneration may be impeded, there is demand for biomaterials that possess rapid bactericidal and tissue repair capability. Herein we report in situ promotion of wound healing by a photothermal therapy (PTT) assisted nanocatalytic antibacterial system utilizing a polydopamine (PDA) coating on hydroxyapatite (HAp) incorporated with gold nanoparticles (Au-HAp). The PDA@Au-HAp NPs produce hydroxyl radicals (.OH) via catalysis of a small concentration of H2O2 to render bacteria more vulnerable to the temperature change. The antibacterial efficacy against Escherichia coli and Staphylococcus aureus is 96.8% and 95.2%, respectively, at a controlled photo-induced temperature of 45 °C that causes no damage to normal tissues. By combining catalysis with near-infrared (NIR) photothermal therapy, the PDA@Au-HAp NPs provide safe, rapid, and effective antibacterial activity compared to .OH or PTT alone. In addition, this system stimulates the tissue repairing-related gene expression to facilitate the formation of granulation tissues and collagen synthesis and thus accelerate wound healing. After the 10-day treatment of skin wounds in vivo, PDA@Au-HAp group exhibits quicker recovery than the control group and both sterilization and healing are completed after the 10-day treatment. Statement of significance: This study presents in situ promotion of wound healing by a low-temperature photothermal therapy (PTT) assisted nanocatalytic antibacterial system utilizing a polydopamine (PDA) coating on hydroxyapatite (HAp) incorporated with gold nanoparticles (Au-HAp). The PDA@Au-HAp NPs produce hydroxyl radicals ([rad]OH) via catalysis of a small concentration of H2O2 to render bacteria more vulnerable to temperature change. After irradiation by 808 nm laser, the antibacterial efficacy against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) is 96.8% and 95.2%, respectively, at a low photo-induced temperature of 45 °C which causes no damage to normal tissues. In addition, this system stimulates the tissue repairing-related gene expression to facilitate the formation of granulation tissues and collagen synthesis and accelerate wound healing.

Research Area(s)

  • Antibacterial, Au, Controlled temperature photothermal therapy, Hydroxyapatite, Wound healing

Citation Format(s)

Controlled-temperature photothermal and oxidative bacteria killing and acceleration of wound healing by polydopamine-assisted Au-hydroxyapatite nanorods. / Xu, Xiaomo; Liu, Xiangmei; Tan, Lei; Cui, Zhenduo; Yang, Xianjin; Zhu, Shengli; Li, Zhaoyang; Yuan, Xubo; Zheng, Yufeng; Yeung, Kelvin Wai Kwok; Chu, Paul K.; Wu, Shuilin.

In: Acta Biomaterialia, Vol. 77, 01.09.2018, p. 352-364.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review