Quantitation of cutaneous Langerhans cells of sarcoidosis patients.

Langerhans cells play a role in cell-mediated immune reactions which are often depressed in sarcoidosis. We examined the epidermis of 17 anergic patients with sarcoidosis (Kveim-reactive and/or biopsy-proved) for the number of Langerhans cells in noninvolved skin and in any cutaneous sarcoidal lesions. Skin biopsies of 10 healthy volunteers served as controls. In comparison to controls, the epidermis overlying noninvolved (p less than 0.05), sarcoidal (p less than 0.0005), and Kveim-reactive (p less than 0.005) skin contained significantly fewer detectable Ia and T6 antigen-bearing Langerhans cells. The reductions within noninvolved skin were most pronounced in patients with multisystem disease. Lower epidermal Langerhans cell densities, in comparison to controls, were detected in both prednisone-treated and untreated patients. Epidermis overlying sarcoidal skin of untreated patients contained significantly fewer Ia and T6 antigen-bearing Langerhans cells (p less than 0.05, p less than 0.0025, respectively) than epidermis from noninvolved skin. Whether reduced numbers of cutaneous Langerhans cells are due to either a local and/or systemic effect of sarcoidosis, or reflect the anergic state of these patients is unknown.