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Published on: April 20, 2016
The steady-state turnover of murine epidermal Langerhans cells
M Ghaznawie1, J M Papadimitriou, P J Heenan
1Department of Pathology, Medical Faculty, University of Hasanuddin, Jalan Kandea 2A, Ujung Pandang, Indonesia. mahmud@unhas.ac.id
Insights
Murine epidermal Langerhans cells (LCs) continuously migrate out of the skin and are replaced by bone marrow precursors. This study estimates the LC half-life in the epidermis to be approximately 9 days.
Area of Science:
- Immunology
- Dermatology
- Cell Biology
Background:
- Langerhans cells (LCs) are critical immune cells in the epidermis.
- Understanding epidermal LC turnover is essential for immune regulation and skin health.
Purpose of the Study:
- To investigate the steady-state turnover dynamics of murine epidermal Langerhans cells (LCs).
- To determine the contribution of local proliferation versus precursor cell replacement in maintaining the LC population.
Main Methods:
- X-irradiation model to assess LC density changes.
- 3H-thymidine autoradiography to evaluate cell proliferation.
- Cultured epidermal sheet explants to study LC behavior ex vivo.
Main Results:
- Epidermal LC density decreased linearly after irradiation, independent of skin shielding.
- Local mitosis contributed minimally (0.013% labeling index) to LC maintenance.
- LCs continuously leave the epidermis and are replaced by circulating precursors.
- Local X-irradiation caused temporary density reduction but not significant cell destruction.
Conclusions:
- Murine epidermal LCs are maintained by a continuous influx of circulating precursor cells.
- The estimated half-life of epidermal LCs is approximately 9 days.
- Local proliferation plays a minor role in epidermal LC population homeostasis.
Abstract:
We have investigated the steady-state turnover of murine epidermal Langerhans cells (LCs) using an X-irradiation model, 3H-thymidine autoradiography and cultured epidermal sheet explants, and by assessing the LC population in normal mice. The LC density after whole-body irradiation without any cutaneous shielding was not significantly different from that in skin shielded during whole-body irradiation (P > 0.05), indicating that the additional irradiation to the skin did not contribute to a decrease in LC density. In both instances, the LC number gradually decreased in a linear fashion. The results indicate that epidermal LCs continuously leave the epidermis and are continually replaced by circulating precursor cells from the bone marrow at a steady rate. Autoradiographic studies after a pulse injection of 3H-thymidine showed a labelling index of 0.013%, indicating that local mitosis is not an important contributor to the maintenance of the epidermal LC population. Although local X-irradiation resulted in temporary reduction of LC density, epidermal sheet explant culture obtained immediately after local X-irradiation showed no difference in LC density as compared with control unirradiated skin, indicating that the decrease in LC density was not due to significant LC destruction. From these data, we calculated that the half-life of murine LCs in the epidermis is approximately 9 days.
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