Journal
BIOCONJUGATE CHEMISTRY
Volume 19, Issue 1, Pages 145-152Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bc700227z
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Funding
- NATIONAL CENTER FOR RESEARCH RESOURCES [P20RR015563, P20RR016443] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ARTHRITIS AND MUSCULOSKELETAL AND SKIN DISEASES [R03AR054035] Funding Source: NIH RePORTER
- NCRR NIH HHS [P20 RR015563, P20 RR015563-076485, P20 RR016443, P20 RR015563-086731, P20 RR016443-086923, P20 RR015563-060017] Funding Source: Medline
- NIAMS NIH HHS [R03 AR054035, R03 AR054035-01A1, R03 AR054035-02, 1R03 AR054035-01A1] Funding Source: Medline
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Targeted delivery of therapeutics possesses the potential to localize therapeutic agents to a specific tissue as a mechanism to enhance treatment efficacy and abrogate side effects. Antibodies have been used clinically as therapeutic agents and are currently being explored for targeting drug-loaded nanoparticles. Peptides such as RGD peptides are also being developed as an inexpensive and stable alternative to antibodies. In this study, cyclo(1,12)PenlTDGEATDSGC (cLABL) peptide was used to target nanoparticles to human umbilical cord vascular endothelial cell (HUVEC) monolayers that have upregulated intercellular cell-adhesion molecule-1 (ICAM-1) expression. The cLABL peptide has been previously demonstrated to possess high avidity for ICAM-1 receptors on the cell surface. Poly(DL-lactic-coglycolic acid) nanoparticles conjugated with polyethylene glycol and cLABL demonstrated rapid binding to HUVEC with upregulated ICAM-1, which was induced by treating cells with the proinflammatory cytokine, interferon-gamma. Binding of the nanoparticles could be efficiently blocked by preincubating cells with free peptide suggesting that the binding of the nanoparticles is specifically mediated by surface peptide binding to ICAM-1 on HUVEC. The targeted nanoparticles were rapidly endocytosed and trafficked to lysosomes to a greater extent than the untargeted PLGA-PEG nanoparticles. Verification of peptide-mediated nanoparticle targeting to ICAM-1 may ultimately lead to targeting therapeutic agents to inflammatory sites expressing upregulated ICAM-1.
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