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Oral lupus erythematosus: markers of immunologic injury

Tissue speciments were taken from three regions in a patient with oral progressive lupus erythematosus (LE): the tongue, the buccal mucosa and clinically uninvolved cutaneous (issue. They were subjected to immunocytochemical studies by use of markers. HLA‐DR antigen expression on mucosal epithelial cells was found in association with a predominance of activated helper T‐Cells in the lesional tissue. Langerhans cells (OKT‐6) and B‐cells (Leu‐IO, B1 and B2) were nearly absent in the mucosal lesions. The presence of populations of macrophages (MY‐4) in the lesional epithelium might suggest an important role for these cells, rather than for Langerhans cells, in the afferent limb of cellular immunity in this case of LE.