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Multivalent nanoparticles bind the retinal and choroidal vasculature.

Robert Hennig1, Andreas Ohlmann2, Janina Staffel3

  • 1Department of Pharmaceutical Technology, University of Regensburg, Regensburg, Germany.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|October 24, 2015
PubMed
Summary

This study introduces a novel nanoparticle system for targeting angiotensin II receptor type 1 (AT1R) in the eye. This approach enhances therapeutic delivery for severe ocular diseases like diabetic retinopathy and macular degeneration.

Keywords:
Age-related macular degenerationAngiotensin IIAngiotensin II (PubChem CID: 172198)Diabetic retinopathyEXP3174EXP3174 (PubChem CID: 108185)MultivalencyQuantum dots

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Area of Science:

  • Ophthalmology
  • Nanotechnology
  • Pharmacology

Background:

  • Angiotensin II receptor type 1 (AT1R) is crucial in ocular diseases like diabetic retinopathy and age-related macular degeneration.
  • Current small molecule angiotensin receptor blockers (ARBs) have limited therapeutic success in treating these conditions.

Purpose of the Study:

  • To develop and evaluate a nanoparticle system for targeted delivery of ARBs to AT1R-expressing cells in the posterior eye.
  • To investigate the efficacy of multivalent ARB presentation on quantum dots (Qdots) for enhanced AT1R blockade.

Main Methods:

  • Engineered nanoparticles with ARB molecules displayed multivalently on quantum dots (Qdots).
  • Assessed nanoparticle targeting and inhibition of angiotensin receptor signaling in vitro (IC50 = 3.8 nM).
  • Evaluated nanoparticle accumulation in retinal and choroidal blood vessels after intravenous injection in mice.

Main Results:

  • Multivalent nanoparticles selectively targeted and inhibited AT1R signaling in high-expression cells.
  • Accumulation in ocular blood vessels was enhanced compared to non-targeted Qdots.
  • Minimal off-target accumulation in kidneys was observed, indicating high specificity.

Conclusions:

  • Multivalent ARB-displaying nanoparticles offer a promising strategy for amplifying AT1R blockade in the eye.
  • This approach facilitates targeted delivery of therapeutic payloads to ocular lesions.
  • The system shows potential for treating severe ocular diseases with improved efficacy and reduced side effects.