Journal
EXPERIMENTAL DERMATOLOGY
Volume 20, Issue 2, Pages 145-146Publisher
WILEY
DOI: 10.1111/j.1600-0625.2010.01146.x
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Epidermal Langerhans cells (LC) are dendritic, antigen-presenting cells residing within mammalian epidermis and mucosal epithelia. When massively depleted, they are replaced by cells of bone-marrow origin. However, their renewal within normal skin under steady-state conditions is not precisely known. We observed that epidermal LC within a human hand allograft remain stable in the long term (10 years) and are not replaced by cells of recipient's origin; furthermore, we observed a Langerhans cell in mitosis within the epidermis 8 years postgraft. These results show that under almost physiological conditions, human LC renew in the epidermis by local mitoses of preexisting cells.
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