Abstract
Langerhans cells (LC) are considered to play an important role in the initiation of the immune response in the skin. This study was performed to analyse the kinetics of LC in normal human epidermis. Using flow cytometry (FCM), we have applied three methods to estimate LC DNA distribution: FCM DNA measurement in LC-enriched suspensions (70-90% purity), FCM-correlated analysis of DNA and OKT6-positive cells in original epidermal cell suspensions, and staining of LC-enriched suspensions by the Feulgen technique on microscopic slides and counter labelling of contaminating keratinocytes with anti-keratin antiserum to eliminate them from the LC DNA estimation. All three methods clearly showed that human LC are a cycling cell population, and it was suggested that LC may represent a stable, self-reproducing cell population in normal epidermis.
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