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Related Experiment Video

Updated: May 23, 2026

Depletion and Reconstitution of Macrophages in Mice
08:50

Depletion and Reconstitution of Macrophages in Mice

Published on: August 1, 2012

Nanoparticle-based clodronate delivery mitigates murine experimental colitis.

Wiebke Niebel1, Katharina Walkenbach, Arnaud Béduneau

  • 1Laboratory of Pharmaceutical Technology and Biopharmaceutics, University of Bonn, Germany.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|March 27, 2012
PubMed
Summary

Clodronate nanoparticles effectively reduced inflammation in experimental colitis models by targeting macrophages. Intracellular delivery of clodronate was key for its anti-inflammatory effect, unlike free clodronate.

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Area of Science:

  • Nanomedicine
  • Gastroenterology
  • Immunology

Background:

  • Inflammatory bowel disease (IBD) involves disrupted intestinal barrier function and immune cell infiltration.
  • Macrophages in inflamed tissues can selectively accumulate particulate delivery systems.
  • Targeted delivery of anti-inflammatory agents to the colon is a therapeutic challenge.

Purpose of the Study:

  • To develop and evaluate clodronate-loaded nanoparticles (ClNP) for targeted delivery in inflammatory bowel disease.
  • To assess the in vivo efficacy of ClNP in murine models of colitis.
  • To investigate the mechanism of action of ClNP in reducing inflammation.

Main Methods:

  • Clodronate-loaded nanoparticles (ClNP) were prepared using a cationic polymethacrylate (Eudragit RL) via solvent displacement.

Related Experiment Videos

Last Updated: May 23, 2026

Depletion and Reconstitution of Macrophages in Mice
08:50

Depletion and Reconstitution of Macrophages in Mice

Published on: August 1, 2012

  • Particle size and drug release characteristics were analyzed.
  • In vivo efficacy was tested in TNBS- and oxazolone-induced murine colitis models, measuring myeloperoxidase and alkaline phosphatase activity.
  • In vitro studies used RAW 264.7 macrophages to assess cytokine secretion (TNF-α, IL-6).

    • Main Results:

    • ClNP demonstrated a particle diameter of approximately 120nm.
    • In vivo, ClNP significantly reduced myeloperoxidase and alkaline phosphatase activity in colitis models, while free clodronate had no significant effect.
    • In vitro, ClNP, but not free clodronate, decreased TNF-α and IL-6 secretion from activated macrophages.
    • Intracellular delivery of clodronate was identified as crucial for the anti-inflammatory effect.

    Conclusions:

    • Clodronate-loaded nanoparticles show therapeutic potential in experimental colitis by targeting macrophages.
    • The anti-inflammatory effect of clodronate in IBD models is dependent on its intracellular delivery.
    • ClNP offer a promising strategy for targeted drug delivery in inflammatory bowel disease, although therapeutic benefits require further optimization.