Use of flow cytometry for characterization and fractionation of cell populations based on their expression of heparan sulfate epitopes.

The ability to characterize alterations in heparan sulfate (HS) structure during development or as a result of loss or mutation of one or more components of the HS biosynthetic pathway is essential for broad understanding of the effects these changes may have on cell/tissue function. The use of anti-HS antibodies provides an opportunity to study HS chain composition in situ, with a multitude of different antibodies having been generated that recognize subtle differences in HS patterning, with the number and positioning of sulfate groups influencing antibody binding affinity. Flow cytometry is a valuable technique to enable the rapid characterization of the changes in HS-specific antibody binding in situ, allowing multiple cell types to be directly compared. Additionally fluorescent-activated cell sorting (FACS) allows fractionation of cells based on their HS-epitope expression.