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DNA Origami-Platelet Adducts: Nanoconstruct Binding without Platelet Activation.

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Researchers developed a novel method to attach DNA origami nanotiles to platelets without causing activation. This technique allows for efficient, high-density labeling of platelets for advanced mechanosensing and drug delivery applications.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Hematology

Background:

  • Platelets are crucial mechanosensitive blood cells involved in vascular integrity, bleeding, and thrombosis.
  • The platelet membrane acts as a primary interface for sensing mechanical and chemical stimuli.
  • Existing methods for attaching sensors to platelets often trigger unwanted activation, limiting research and therapeutic applications.

Purpose of the Study:

  • To develop and optimize a non-activating method for instrumenting human platelets with DNA origami constructs.
  • To investigate the efficacy of DNA origami nanotile hybridization to platelet membranes.
  • To assess the impact of DNA origami attachment on platelet morphology and function.

Main Methods:

  • Design and fabrication of multivalent DNA origami nanotile constructs.
  • Development and validation of two DNA hybridization protocols for attaching nanotiles to membrane-embedded linkers on platelets.
  • Quantitative flow cytometry and transmission electron microscopy to assess binding efficacy, platelet morphology, activation, aggregation, and microparticle generation.

Main Results:

  • Optimized DNA origami binding efficacy by increasing binding overhangs from two to six, with no further benefit at 12 overhangs.
  • Demonstrated high-density binding of DNA origami nanotiles to human platelets using low quantities of DNA material.
  • Verified that DNA origami attachment did not alter platelet morphology, activation, aggregation, or microparticle formation.

Conclusions:

  • Successfully instrumented platelets with DNA origami constructs without compromising their morphology or function.
  • Developed an efficient, non-activating protocol for high-density platelet labeling.
  • This method provides a foundation for DNA origami-based platelet mechanosensing and targeted therapeutic delivery.