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Epidermal Langerhans cells--a cycling cell population
The Journal of Investigative Dermatology
|May 1, 1985
Summary
Human Langerhans cells (LC) are a cycling cell population in the epidermis. These findings suggest LC are a stable, self-reproducing cell type in normal skin.
Area of Science:
- Dermatology
- Cell Biology
- Immunology
Background:
- Langerhans cells (LC) are crucial immune cells in the epidermis.
- Limited numbers and technical challenges have hindered the study of LC kinetics.
Purpose of the Study:
- To investigate the cell cycle kinetics of human epidermal Langerhans cells (LC).
- To determine if LC are a cycling or static cell population in normal epidermis.
Main Methods:
- Employed three distinct flow cytometry (FCM) methods to analyze LC-DNA distribution.
- Utilized fluorescence-activated cell sorting (FACS) and Feulgen staining for precise DNA measurement.
- Developed techniques to isolate and analyze LC from epidermal cell suspensions, minimizing keratinocyte contamination.
Main Results:
- All three in vitro methods demonstrated that human LC are actively cycling cells.
- LC were found in S and G2/M phases at percentages (1.3-3.3% and 1.0-2.5%) comparable to keratinocytes.
- This indicates a proliferative capacity within the epidermal LC population.
Conclusions:
- Human epidermal Langerhans cells (LC) are a cycling cell population.
- LC kinetics suggest they are a stable, self-reproducing cell population within the normal epidermis.
- These findings contribute to understanding epidermal homeostasis and immune surveillance.