2. Academic Validation
  3. Dual drugs decorated bacteria irradiate deep hypoxic tumor and arouse strong immune responses

Dual drugs decorated bacteria irradiate deep hypoxic tumor and arouse strong immune responses

  • Biomaterials. 2022 Jul;286:121582. doi: 10.1016/j.biomaterials.2022.121582.
Wenfei Chen 1,  Chunting He 2,  Nan Qiao 2,  Zhaofei Guo 2,  Shilong Hu 3,  Yuanshuai Song 2,  Hairui Wang 2,  Zhirong Zhang 2,  Bowen Ke 4,  Xun Sun 5
Affiliations

Affiliations

  • 1 Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, PR China; Department of Pharmacy, Laboratory of Clinical Pharmacy and Adverse Drug Reaction, West China Hospital, Sichuan University, Chengdu, 610041, PR China.
  • 2 Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, PR China.
  • 3 Department of Anesthesiology, Laboratory of Anesthesiology and Critical Care Medicine, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, 610041, PR China.
  • 4 Department of Anesthesiology, Laboratory of Anesthesiology and Critical Care Medicine, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, 610041, PR China. Electronic address: [email protected].
  • 5 Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, PR China. Electronic address: [email protected].
PMID: 35609407 DOI: 10.1016/j.biomaterials.2022.121582
Abstract

Intratumoral environment as a hypoxic, non-inflamed "cold" state is difficult for many agents to accumulate and activate the immune system. Intrinsically, facultative anaerobic Salmonella VNP20009 target the tumor hypoxic areas, invade into tumor cells and exhibit an immune effect. Here we engineer the bacteria by decorating their surface with newly synthesized heptamethine cyanine dyes NHS-N782 and JQ-1 derivatives to obtain the biohybrid agent N-V-J, leading to the deep tumor targeted photothermal therapy and magnified immunotherapy. Due to the mitochondrial targeting capacity of NHS-N782, N-V-J becomes susceptive to the temperature rise when reaching tumors. This synergistic strategy promotes the systemic immunity by creating an inflamed "hot" tumor state from three different dimensions, which include the inherent immunogenicity of bacteria, the near-infrared laser triggered tumor antigens and the downregulation of PD-L1 expression. All these approaches result in effective and long-lasting T cell immune responses to prevent local and distant tumors for extended time. Leveraging the attenuated bacteria to transport dual drugs to the tumor tissues for self-synthetic vaccines provides a novel paradigm to enhance the bacteria-mediated Cancer Immunotherapy.

Keywords

Bacteria-mediated drug delivery; Cancer immunotherapy; Deep tumor tissues; Mitochondrial targeting; Photothermal drugs.

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