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Light-Responsive Elastin-Like Peptide-Based Targeted Nanoparticles for Enhanced Spheroid Penetration.

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Researchers developed smart nanoparticles that shrink when exposed to light, improving cancer cell targeting and penetration for better drug delivery. This breakthrough enhances nanomedicine for cancer therapy.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Drug Delivery Systems

Background:

  • Targeted nanoparticles (NPs) are crucial for effective drug delivery, but their size can limit tissue penetration.
  • Elastin-like peptides (ELPs) offer tunable properties for nanomedicine design.
  • Controlling nanoparticle size and function in response to external stimuli is a key challenge in nanomedicine.

Purpose of the Study:

  • To develop a near-infrared light-responsive nanoparticle system based on elastin-like peptides (ELPs).
  • To investigate the size-switching capability of these nanoparticles and its effect on targeting and cargo delivery.
  • To evaluate the efficacy of these stimuli-responsive nanoparticles in penetrating tumor spheroids and killing cancer cells.

Main Methods:

  • Assembly of diblock ELP micelles encapsulating photosensitizer TT1-monoblock ELP conjugates.
  • Induction of nanoparticle size transformation from 120 nm to 25 nm using near-infrared light irradiation.
  • Assessment of nanoparticle targeting efficiency and cargo delivery post-transformation.
  • Evaluation of nanoparticle penetration depth and cancer cell killing efficacy in 3D tumor spheroids.

Main Results:

  • Near-infrared light irradiation triggered rapid NP size reduction from 120 nm to 25 nm.
  • The targeting function of the NPs was maintained after light-induced size transformation.
  • Smaller NPs exhibited enhanced penetration into tumor spheroids compared to larger NPs.
  • The size-switching NPs demonstrated more efficient cancer cell killing.

Conclusions:

  • Developed a novel light-responsive ELP-based nanoparticle system capable of size modulation.
  • Demonstrated that size reduction enhances NP penetration and therapeutic efficacy in a 3D cancer model.
  • This technology holds promise for designing advanced nanomedicines with improved tumor penetration for cancer therapy.