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Tunable physiologic interactions of adhesion molecules for inflamed cell-selective drug delivery

Sungkwon Kang1, Taehyun Park, Xiaoyue Chen

  • 1Department of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA.

Biomaterials
|February 11, 2011
PubMed

Insights

Targeted delivery of celastrol using liposomes targeting ICAM-1/LFA-1 interactions effectively reduced inflammation. This approach enhances drug efficacy and minimizes side effects for treating inflammatory diseases.

Area of Science:

  • Immunology
  • Nanotechnology
  • Pharmacology

Background:

  • Dysregulated inflammation drives disease pathogenesis, but current anti-inflammatory treatments are limited by efficacy and side effects.
  • Site-directed drug delivery offers a promising strategy to improve therapeutic outcomes by increasing local drug concentration and reducing systemic toxicity.
  • Targeting inflammatory sites is challenging due to complex immune cell interactions and low basal expression of endogenous targets.

Purpose of the Study:

  • To develop a targeted drug delivery system for the anti-inflammatory drug celastrol using a physiological interaction between intercellular adhesion molecule-1 (ICAM-1) and lymphocyte function-associated antigen-1 (LFA-1).
  • To enhance the specificity and comprehensive delivery of celastrol to inflamed cells, thereby improving therapeutic efficacy and safety.

Main Methods:

  • Liposomes functionalized with an affinity and avidity-tuned inserted (I) domain of LFA-1 were designed to target ICAM-1 overexpressed on inflamed endothelial cells (HMEC-1) and monocytes (THP-1).
  • The targeting specificity was evaluated on lipopolysaccharides (LPS)-treated cells, and the therapeutic effects of celastrol-loaded liposomes were assessed in cellular models of inflammation.

Main Results:

  • Liposomes demonstrated enhanced specificity for inflamed HMEC-1 and THP-1 cells via ICAM-1/LFA-1 interaction, mimicking physiological binding dynamics.
  • Targeted delivery of celastrol protected cells from LPS-induced inflammation, suppressed pro-inflammatory responses, and inhibited inflammation-driven cell proliferation.
  • The system effectively blocked monocyte adhesion to inflamed endothelial cells, mitigating immune cell accumulation and inflammatory signaling.

Conclusions:

  • Affinity and avidity modulation of targeting moieties on nanoparticles are critical design parameters for achieving specific and safe drug delivery.
  • Tunable physiological interactions represent a viable strategy for designing effective nanoparticle-based drug carriers for treating immune and inflammatory diseases in vivo.

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