Enrichment of epidermal Langerhans cells: Studies with a monolayer technique and flow cytometry sorting

Abstract

Langerhans cells were enriched from epidermal cell suspensions by a monolayer technique based on the association of Langerhans cells with solid matrix-boung anti-Ia antibodies or by flow cytometry sorting of fluorescein-isothiocyanate labeled anti-Ia reactive cells. The monolayer technique gave a moderate enrichment (15-37%) whereas considerably higher purity (73-87%) was obtained by flow cytometry sorting. The identity of the enriched anti-Ia reactive cells as Langerhans cells was established by histochemical techniques or electron microscopy. The monolyer-enriched Langerhans cells could function as stimulating cells in the mixed leukocyte culture reaction and as antigen-presenting cells.