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Engineering polymeric RNA scaffolds as programmable combinatorial innate immune agonists.

Yinying Yang1,2, Andrew K Alvarez2,3, Wenxuan Wang2,3

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Researchers developed polymeric RNAs (polyRNAs) to activate innate immune responses for cancer immunotherapy. These novel scaffolds mimic pathogen structures, enabling combination therapies and showing promise in preclinical models.

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Area of Science:

  • Immunology
  • Biotechnology
  • Oncology

Background:

  • Innate immune cells sense pathogen patterns to guide immune responses, crucial for vaccine adjuvants and cancer immunotherapies.
  • Current adjuvants face limitations in potency and toxicity, hindering clinical translation due to reliance on single agonists and poor understanding of synergistic effects.
  • Scalable platforms for assembling diverse innate immune agonists are lacking, impeding the development of effective combination immunotherapies.

Purpose of the Study:

  • To develop a novel platform for combinatorial innate immune activation using modular scaffolds.
  • To overcome limitations in current adjuvant design by mimicking pathogen structures and presenting multiple agonists.
  • To evaluate the therapeutic potential of these scaffolds in a preclinical cancer model.

Main Methods:

  • Development of polymeric RNAs (polyRNAs) synthesized via rolling circle transcription.
  • Functionalization of polyRNAs to present multiple agonists, including CpG-DNA, for engagement of Toll-like receptor (TLR) 3, 7, 9, and RIG-I.
  • Delivery of polyRNA scaffolds using lipid nanoparticles and evaluation in a syngeneic mouse model of colorectal cancer.

Main Results:

  • PolyRNAs demonstrated strong activation of TLR3, TLR7, and RIG-I pathways.
  • Multivalent patterning of CpG-DNA on polyRNAs enabled further TLR9 signalling.
  • Lipid nanoparticle-delivered polyRNAs effectively eliminated tumors in a colorectal cancer mouse model, showing comparable efficacy to clinical benchmarks.

Conclusions:

  • Polymeric RNAs serve as a programmable platform for combinatorial innate immune activation.
  • This platform mimics pathogen structures and enables synergistic immune responses.
  • PolyRNAs exhibit strong translational potential for enhancing cancer immunotherapy strategies.