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Characterization of human adenoid cells using surface and functional markers for lymphocyte subpopulations.

Adenoid lymphocytes from children undergoing adenoidectomy were compared with blood cells from the same children using techniques for identifying T cells and B cells. A high proportion of adenoid lymphocytes were immunoglobulin positive cells. Of these only a minor fraction carried receptors for the Fc part of IgG. Adenoid B lymphocytes respond poorly if at all to polyclonal B-cell activators, such as LPS or PPD, which show a different reactivity compared to human splenic cells. The response to anti B2-microglobulin was also different; blood cells responded better than adenoid cells. Thus distinct subpopulations of B lymphocytes reside in different lymphoid organs. The adenoid lymphocyte reactivity might reflect their function in the defence mechanism against infections.