Raising antibodies against circulating foetal cells from maternal peripheral blood

ABSTRACT Objective Cells of foetal origin circulating in the maternal peripheral bloodstream present a unique source for non‐invasive prenatal diagnostics. The aims of this study were to raise antibodies against identified circulating foetal cells from the maternal blood, test the properties of these antibodies and to determine the foetal cell type recognised by the antibodies. Method Cells from a male foetus were identified in a maternal blood sample by FISH analysis of the X‐ and Y‐ chromosomes. The identified cells were subjected to phage display selection using a novel single cell selection strategy. Selected antibodies were tested by immunocytochemistry on foetal and adult tissue arrays, an endothelial cell line, and peripheral blood mononuclear cells. Results Three identified foetal cells subjected to antibody selection, yielded a total of 12 antibodies. Three antibodies gave distinct staining patterns on tissue arrays, and endothelial cells. One antibody, SF1.3, shows specific staining of a subpopulation of peripheral blood mononuclear cells, including a fraction of CD34 positive cells. Conclusion These findings indicate that the identified foetal cells could have been progenitor cells of haematopoietic origin. The antibody SF1.3 could be a potential tool toward non‐invasive prenatal diagnostics. © 2013 John Wiley & Sons, Ltd. What's already known about this topic? It is known that different cell types are involved in foetal microchimerism. There is a lack of marker/antibodies for obtaining foetal cell from maternal blood for non‐invasive diagnostics What does this study add? This is the first reported antibody selection against foetal cell from maternal blood Adds knowledge about the cells involved in foetal microchimerism Have raised an antibody with potential application in non‐invasive prenatal diagnostics