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Targeted nanocarriers effectively remove cholesterol from macrophages.

Jin Chen1, Qing Miao1, Xinrong Xiao1

  • 1School of Chemistry and Chemical Engineering, University of South China, Hengyang, People's Republic of China.

Bio-Medical Materials and Engineering
|September 12, 2025
PubMed
Summary

Researchers developed a novel nanocarrier, CD-G5-PEG-Man, to target macrophages involved in atherosclerosis. This nanocarrier effectively reduces cholesterol buildup in macrophages, offering a promising strategy for treating atherosclerotic plaque development.

Keywords:
PAMAMcholesterol effluxcyclodextrinsmacrophagestargeted nanoparticles

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Cardiovascular Research

Background:

  • Macrophages accumulate cholesterol, forming foam cells that exacerbate inflammation and drive atherosclerotic plaque progression.
  • Targeting macrophages is crucial for developing effective atherosclerosis therapies.
  • Novel nanocarriers are needed to specifically deliver therapeutic agents to atherosclerosis-associated macrophages.

Purpose of the Study:

  • To engineer and characterize a novel mannose-functionalized nanocarrier (CD-G5-PEG-Man) for targeting atherosclerosis-associated macrophages.
  • To evaluate the in vitro safety and cellular uptake of the developed nanocarrier.
  • To assess the nanocarrier's efficacy in promoting cholesterol efflux from macrophages.

Main Methods:

  • Synthesis of CD-G5-PEG-Man by modifying beta-cyclodextrin (β-CD) onto polyamidoamine G5.0 (PAMAM G5.0) and subsequently functionalizing with mannose via a PEG linker.
  • Structural characterization and assessment of particle size and morphology.
  • In vitro evaluation of cytotoxicity, cellular uptake in macrophages using fluorescently labeled nanoparticles, and cholesterol efflux assays.

Main Results:

  • CD-G5-PEG-Man exhibited a spherical morphology with an average particle size of 110 nm.
  • The nanocarrier demonstrated no significant toxicity to macrophages across tested concentrations.
  • Enhanced cellular uptake of CD-G5-PEG-Man-FITC by macrophages was observed, specifically mediated by mannose receptors, and it effectively reduced intracellular cholesterol levels.

Conclusions:

  • A safe and effective nanocarrier, CD-G5-PEG-Man, was successfully developed for targeting macrophages.
  • The mannose moiety ensures specific targeting of macrophages via mannose receptors.
  • The β-CD component synergistically facilitates cholesterol efflux, presenting a dual-action therapeutic strategy for atherosclerosis.