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"Eat me" imaging and therapy.

Vaishali Bagalkot1, Jeffrey A Deiuliis1, Sanjay Rajagopalan1

  • 1Division of Cardiovascular Medicine, Department of Medicine, University of Maryland, Baltimore, MD, 21201, United States.

Advanced Drug Delivery Reviews
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Phosphatidylserine (PtdSer) nanoparticles act as "eat-me" signals for immune cells, enhancing drug delivery and imaging for various diseases. This approach leverages natural apoptotic clearance mechanisms for therapeutic benefits.

Keywords:
Drug deliveryImagingImmune responseLeukocytesLiposomesPhagocytesPhosphatidylserine

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Area of Science:

  • Immunology
  • Biomedical Engineering
  • Nanotechnology

Background:

  • The innate immune system clears apoptotic debris, a process crucial for maintaining tissue homeostasis.
  • Engineered drug delivery vehicles can leverage apoptotic clearance principles for enhanced therapeutic efficacy.
  • Phosphatidylserine (PtdSer) is a key "eat-me" signal recognized by phagocytic immune cells.

Purpose of the Study:

  • To explore the application of PtdSer in nanoparticle-based therapeutics.
  • To investigate PtdSer-functionalized nanoparticles as targeted delivery vehicles for immune cells.
  • To understand the potential of PtdSer in facilitating nanoparticle engulfment, imaging, and therapy.

Main Methods:

  • Engineering nanoparticles with phosphatidylserine (PtdSer) as an "eat-me" signal.
  • Investigating the interaction of PtdSer-nanoparticles with phagocytic immune cells, particularly macrophages.
  • Evaluating the potential for imaging and therapeutic applications in disease models.

Main Results:

  • PtdSer-functionalized nanoparticles are readily engulfed by phagocytic immune cells.
  • This targeted uptake facilitates nanoparticle accumulation at sites of inflammation.
  • PtdSer-bearing nanoparticles show potential for both diagnostic imaging and therapeutic interventions, with possible immunomodulatory effects.

Conclusions:

  • Leveraging PtdSer as an "eat-me" signal on nanoparticles enhances their clearance by immune cells.
  • This strategy offers a promising approach for targeted drug delivery, imaging, and immunomodulation in various pathologies.
  • Further understanding of "eat-me" signal immunobiology is essential for advancing PtdSer-based biomedical applications.