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IDENTIFICATION OF A NOVEL DENDRITIC CELL SURFACE ANTIGEN DEFINED BY CARBOHYDRATE SPECIFIC CD24 ANTIBODY CROSS-REACTIVITY

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Dendritic cells (DC) are characterized as leucocytes that lack mature lineage specific markers and stimulate naive T-lymphocyte proliferation in vitro and in vivo. The mouse heat stable antigen (HSA) participates in T lymphocyte co-stimulation and is expressed by DC isolated from thymus, skin and spleen. The human HSA homologue, CD24, is predominantly expressed by B lymphocytes and granulocytes, but its expression on DC has not been studied in detail. CD24 clearly participates in B-lymphocyte signalling but co-stimulatory activity for T lymphocytes has not yet been described. We have examined the expression of CD24 on human peripheral blood DC populations isolated directly or following in vitro culture. The CD24 antigen was absent from blood DC; however, cross-reactive, sialylated carbohydrate epitopes were detected on DC with some CD24 monoclonal antibodies (mAb). These CD24 mAb define a protein surface antigen, which is expressed by an immature or resting subpopulation of peripheral blood DC and is down-regulated following activation/differentiation in vitro.
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Document Type: Research Article

Affiliations: Haematology/Immunology Research Group, Christchurch School of Medicine and Christchurch Hospital, Christchurch, New Zealand

Publication date: September 1, 1996

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