IgE plasma cells in human jejunum demonstrated by immune electron microscopy.
An immune electron microscopy technique has been employed to detect IgE plasma cells in histologically normal human jejunal biopsies. Anti-IgE-labelled plasma cells have been found in the lamina propria of three out of eight biopsies studied. Thus this report ends speculation regarding the presence of IgE plasma cells in human jejunum and supports other data indicating local IgE production in mucosal tissues.