Bacteriophage biopanning in human tumour biopsies to identify cancer-specific targeting ligands

Area of Science:

• Oncology
• Biotechnology
• Molecular Biology

Background:

• Intravenous delivery of anticancer agents requires precise targeting to enhance efficacy and therapeutic index.
• Rational drug design is challenged by complex tumor tissue architecture that can impede bloodstream access to target receptors.
• Bacteriophage biopanning offers a functional selection method for identifying targeting sequences, but its application in polarized human tumors requires novel approaches.

Purpose of the Study:

• To develop and validate an ex vivo, intra-arterial biopanning method for identifying intravascularly-targeting oligopeptide sequences in human colorectal tumors.
• To establish a novel strategy for the rational design of targeted anticancer therapies and diagnostic agents.

Main Methods:

• An ex vivo, intra-arterial biopanning technique was employed using freshly resected human colorectal tumors.
• Reiterative panning was performed to select for oligopeptide sequences with high affinity for tumor vasculature.
• Consensus sequences were identified and validated for their targeting capabilities in tumor samples from different patients.

Main Results:

• Significant consensus was achieved for specific oligopeptide sequences after two rounds of biopanning.
• Identified lead sequences demonstrated successful intravascular targeting to human colorectal tumors.
• The method proved effective in identifying tumor-specific targeting sequences across samples from unrelated patients.

Conclusions:

• A novel ex vivo biopanning method enables the selection of oligopeptide sequences for intravascular targeting of human colorectal tumors.
• This approach facilitates the development of consensus targeting sequences for improved tumor imaging and selective delivery of anticancer agents.
• The methodology holds potential for broad applicability in developing targeted therapies for various cancers.