Phenotypic analysis of guinea pig Langerhans cells with antibodies directed against leucocyte surface antigens

The epidermis was stained with a panel of recently produced anti-guinea pig leucocyte antibodies. Guinea pig Langerhans cells were not detectable with antibodies directed against B lymphocytes (MSgp9), T lymphocytes (CT7 and MSgp7), T-helper/inducer (MSgp12) and putative T-suppressor/cytotoxic (CT6 and MSgp6) subsets. Langerhans cell expressed both major histocompatibility complex (MHC) class-I and II antigens and also an epitope (CT4) associated with lymphocyte migration, thus suggesting the migratory potential of this cell. Although the Langerhans cell did not express macrophage specific antigens, MSgp5, which detects lymphoid dendritic cells, was weakly expressed on the Langerhans cell. The Langerhans cell expressed a leucocyte-common antigen detected by H201. Double-labelling studies with anti-MHC class-II antibodies indicated that only 0.4 +/- 0.3% of the pan leucocyte-positive epidermal cells were Ia-negative, indicating that it is unlikely that a guinea pig analogue of the murine Thy-1 + dendritic epidermal cell (Thy-1 + dEC) exists.