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Development of Low-Density Lipoprotein Receptor-Targeted Liposomes for Enhanced Accumulation in Ischemia/Reperfusion

Shintaro Yoneda1,2,3, Kentaro Kogure2,3

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Researchers developed targeted nanoparticles for cerebral ischemia/reperfusion (I/R) injury. These nanoparticles exploit upregulated Low-Density Lipoprotein Receptors (LDLR) on injured cells, improving drug delivery across the blood-brain barrier.

Keywords:
cerebral ischemia/reperfusion injuryendothelial cellliposomelow-density lipoprotein receptoroxygen-glucose deprivation/reoxygenationtargeting peptide

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Area of Science:

  • Neuroscience
  • Biomaterials Science
  • Vascular Biology

Background:

  • Cerebral ischemia/reperfusion (I/R) injury presents significant challenges due to limited treatment options and the blood-brain barrier (BBB) hindering drug delivery.
  • While BBB disruption after I/R offers a temporary window for drug delivery, BBB repair limits therapeutic efficacy over time.

Purpose of the Study:

  • To develop novel nanoparticles that specifically target the I/R environment, overcoming limitations of conventional drug delivery methods.
  • To investigate the potential of targeting the Low-Density Lipoprotein Receptor (LDLR) for enhanced nanoparticle accumulation in I/R-injured brain regions.

Main Methods:

  • An in vitro model of cerebral I/R injury using oxygen-glucose deprivation/reoxygenation (OGD/R) on human umbilical vein endothelial cells (HUVECs).
  • Upregulation of LDLR mRNA and protein expression was assessed in OGD/R-treated cells.
  • Liposomes were modified with a peptide mimicking the LDLR binding site of LDL to create targeted nanoparticles.

Main Results:

  • OGD/R treatment led to early upregulation of LDLR mRNA and increased LDLR expression on HUVECs.
  • Peptide-modified liposomes demonstrated specific binding and enhanced accumulation in OGD/R-treated cells, mediated by LDLR.
  • Blocking LDLR with an antibody significantly reduced the uptake of peptide-modified liposomes, confirming LDLR-dependent targeting.

Conclusions:

  • Low-Density Lipoprotein Receptor (LDLR) is upregulated in endothelial cells under I/R stress.
  • Peptide-modified liposomes targeting LDLR represent a promising strategy for drug delivery to I/R-injured brain tissue.
  • These targeted nanoparticles offer a potential therapeutic approach to improve outcomes for patients with cerebral I/R injury.