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Bacteria-Driven Hypoxia Targeting for Combined Biotherapy and Photothermal Therapy

Wenfei Chen1, Ying Wang1, Ming Qin1

  • 1Key Laboratory of Drug Targeting and Drug Delivery Systems, Ministry of Education, West China School of Pharmacy , Sichuan University , Chengdu 610041 , P.R. China.

ACS Nano
|May 23, 2018
PubMed

Insights

This study combined Salmonella VNP20009 bacteria with polydopamine for enhanced photothermal therapy. The novel approach effectively eliminated malignant melanoma tumors in mice without relapse, showcasing synergistic anticancer effects.

Area of Science:

  • Biomedical Engineering
  • Oncology
  • Materials Science

Background:

  • Salmonella VNP20009 selectively targets hypoxic tumor cores, but its clinical application is limited by weak efficacy and toxicity.
  • Polydopamine (pDA) offers photothermal properties for cancer therapy.
  • Combining VNP20009 biotherapy with pDA-mediated photothermal therapy (PTT) presents a novel strategy to enhance antitumor effects.

Purpose of the Study:

  • To investigate the synergistic antitumor efficacy of VNP20009 combined with polydopamine-mediated photothermal therapy against malignant melanoma.
  • To evaluate the safety and effectiveness of this combined therapeutic approach in a preclinical mouse model.

Main Methods:

  • Salmonella VNP20009 was coated with polydopamine (pDA) via oxidation and self-polymerization.
  • The pDA-coated VNP20009 was administered intravenously to tumor-bearing mice.
  • Near-infrared (NIR) laser irradiation was applied to induce photothermal effects in the tumors.

Main Results:

  • The pDA-coated VNP20009 effectively targeted hypoxic tumor regions.
  • Combined VNP20009 biotherapy and pDA-mediated PTT resulted in complete tumor elimination without relapse or metastasis in a single treatment.
  • A synergistic effect was observed, where VNP20009 and pDA enhanced each other's therapeutic capabilities.

Conclusions:

  • The combination of Salmonella VNP20009 biotherapy and polydopamine-mediated photothermal therapy is a highly effective strategy for treating malignant melanoma.
  • This approach overcomes the limitations of VNP20009 monotherapy, offering enhanced antitumor efficacy and reduced toxicity.
  • The synergistic interaction between VNP20009 and pDA provides a promising platform for developing novel cancer treatments.
Keywords:
hypoxia targetingmalignant melanomaphotothermal therapypolydopaminesalmonella

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