Homing markers for atherosclerosis: applications for drug delivery, gene delivery and vascular imaging

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Biotechnology

Background:

• Endothelial dysfunction is a key factor in atherosclerosis development.
• Pro-inflammatory cytokines (e.g., interleukin-1 beta, tumor necrosis factor alpha) promote endothelial cell activation, leading to a pro-atherogenic state.
• Atherosclerosis involves changes in endothelial cell phenotype, increasing adhesion, thrombosis, and atherogenesis.

Purpose of the Study:

• To identify peptide sequences that specifically target diseased vascular regions.
• To explore the potential applications of these identified peptides in therapeutic and diagnostic contexts.
• To investigate organ-specific targeting in the context of atherosclerosis using phage display.

Main Methods:

• Utilized in vivo phage display biopanning in low density lipoprotein receptor (LDLr) knockout mice.
• Administered phage libraries to mice to allow peptides to bind to specific sites within the vasculature.
• Isolated and characterized peptide sequences that demonstrated preferential homing to diseased vessel walls.

Main Results:

• Successfully identified peptide sequences that exhibit organ specificity within the vasculature of LDLr knockout mice.
• Demonstrated that these peptides can home to diseased regions of the vessel wall.
• The identified peptide sequences represent novel targeting moieties.

Conclusions:

• Phage display in vivo biopanning is an effective method for discovering vascular-homing peptides.
• The identified peptide sequences have significant potential applications in gene and drug delivery systems.
• These peptides can be utilized to improve contrast agents for vascular imaging in atherosclerosis.
• Targeted delivery of therapeutics and diagnostics to atherosclerotic lesions is feasible using these peptides.