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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Drug Delivery Systems

Background:

  • Biomimetic cell membrane-derived particles offer biocompatibility and long circulation for drug delivery.
  • Red blood cell membranes (RBCM) are a promising source for creating these biomimetic systems.

Purpose of the Study:

  • To develop and evaluate acoustically-responsive drug delivery particles derived from RBCM.
  • To investigate the potential of these particles for theranostic applications, combining therapy and diagnostics.

Main Methods:

  • Development of drug-loaded RBCM droplets (RBCMDs) capable of transitioning from liquid to gas upon ultrasound exposure.
  • Loading of camptothecin (CPT) into RBCMDs and assessment of loading and encapsulation efficiencies.
  • Evaluation of drug release and cancer cell death induction upon high-intensity focused ultrasound (HIFU) irradiation.
  • Assessment of ultrasound imaging enhancement capabilities of acoustically vaporized RBCMDs both in vitro and in vivo.

Main Results:

  • Synthesized RBCMDs showed uniform size, good dispersity, and preserved RBCM proteins, evading macrophage uptake.
  • CPT loading efficiency was 2-3% with 62-97% encapsulation efficiency.
  • HIFU triggered on-demand CPT release and droplet explosion, causing significant cancer cell death.
  • Acoustically vaporized RBCMDs enhanced ultrasound echo signals by 30 dB and improved in vivo imaging.

Conclusions:

  • A novel class of naturally derived, acoustically-responsive RBCMDs has been successfully developed.
  • RBCMDs demonstrate significant potential for remotely triggered drug delivery and enhanced ultrasound imaging.
  • These theranostic particles offer a promising platform for future biomedical applications.