Cell-based screening: a high throughput flow cytometry platform for identification of cell-specific targeting...

Area of Science:

• Biotechnology
• Drug Discovery
• Molecular Biology

Background:

• Targeted drug and gene delivery to specific cell types is crucial for treating various medical conditions.
• Peptide-based targeting molecules face rapid inactivation in vivo, necessitating new approaches.
• Existing screening methods for novel targeting molecules are often limited in throughput or compatibility.

Purpose of the Study:

• To develop a high-throughput, cell-based screening method for evaluating large libraries of targeting molecules.
• To assess the biological functionality and stability of synthesized targeting molecules.
• To overcome limitations of current screening techniques for combinatorial libraries.

Main Methods:

• Utilized flow cytometry for a cell-based screening assay.
• Attached each library molecule to microspheres with unique optical properties ('fingerprints').
• Investigated multiplexing capability and microsphere binding to target cells.

Main Results:

• Developed a method capable of screening at least 75 unique compounds per well, scalable to 1875 compounds per well.
• Demonstrated a 12-fold increase in binding affinity for targeted microspheres compared to controls.
• Confirmed specificity of microsphere binding through competitive inhibition assays.

Conclusions:

• The described flow cytometry method enables rapid and effective screening of large targeting molecule libraries.
• This approach utilizes readily available instrumentation, making it accessible to the research community.
• The methodology supports the development of novel, stable, and effective targeted therapies.