Microselection--affinity selecting antibodies against a single rare cell in a heterogeneous population

Area of Science:

• Biotechnology
• Cell Biology
• Immunology

Background:

• Rare cells, such as circulating tumor cells (CTCs), are valuable for non-invasive diagnostics and monitoring.
• Effective isolation of rare cells from heterogeneous populations requires highly specific cell-type markers, typically antibodies.

Purpose of the Study:

• To develop a microselection method for antibody selection against single cells within a heterogeneous population.
• To enable the identification and isolation of rare cells for potential diagnostic applications.

Main Methods:

• A microselection technique utilizing phage display was developed for antibody selection.
• A single K562 cell (XX, female) was isolated among millions of lymphocytes (XY, male) on a glass slide.
• Phage bound to the target cell were protected, while unbound phages were inactivated by UV irradiation.

Main Results:

• The microselection method allowed for antibody selection targeting individual cells.
• Up to eight antibodies were retrieved per single cell selection.
• Three highly K562 cell type-specific antibodies were identified.

Conclusions:

• The developed microselection method is effective for isolating antibodies against specific single cells in complex mixtures.
• This technique holds promise for advancing non-invasive diagnostics through the capture of rare cells like CTCs.