E-selectin targeting to visualize tumors in vivo

Area of Science:

• Biomedical Imaging
• Nanotechnology
• Oncology

Background:

• Angiogenic factors commonly upregulate E-selectin expression on tumor vascular endothelial cells.
• E-selectin serves as a potential biomarker for identifying angiogenic tumors.

Purpose of the Study:

• To develop and evaluate an optical imaging reagent for in vivo tumor visualization using E-selectin targeting.
• To assess the efficacy of anti-E-selectin antibody-conjugated liposomes for tumor imaging.

Main Methods:

• Conjugation of anti-E-selectin monoclonal antibody to liposomes encapsulating near-infrared fluorescent dyes (Cy3 or Cy5.5).
• In vitro evaluation of liposome recognition of E-selectin-expressing endothelial cells induced by TNF-alpha.
• In vivo imaging of tumors in mice using Cy5.5-encapsulated, antibody-conjugated liposomes.

Main Results:

• Liposomes demonstrated specific recognition of E-selectin-induced endothelial cells in vitro.
• Successful visualization of transplanted Ehrlich ascites tumors in mice using the targeted liposomes and Cy5.5 dye.
• The E-selectin targeting strategy proved effective for in vivo tumor visualization.

Conclusions:

• Liposome-based E-selectin targeting with near-infrared dyes is a viable strategy for in vivo tumor imaging.
• This method holds promise for identifying angiogenic tumors and sentinel lymph nodes.
• The approach may also be applicable for targeted drug delivery to tumor cells.