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J. Exp. Med.,
Volume 187, Number 6, March 16, 1998 961-966
1, in the Presence of
Granulocyte/Macrophage Colony-stimulating Factor and
Interleukin 4, Induces Differentiation of Human Peripheral
Blood Monocytes into Dendritic Langerhans Cells
By




From the * Service d'Anatomie Pathologique, Langerhans cells (LCs) are dendritic cells (DCs) that are present in the epidermis, bronchi, and
mucosae. Although LCs originate in bone marrow, little is known about their lineage of origin. In this study, we demonstrate that in vitro LCs may originate from monocytes. Adult peripheral blood CD14+ monocytes differentiate into LCs (CD1a+, E-cadherin+, cutaneous lymphocyte-associated antigen+, Birbeck granules+, Lag+) in the presence of granulocyte/macrophage
colony-stimulating factor, interleukin 4, and transforming growth factor
URA CNRS 1461, Hôpital Necker-Enfants
Malades, § Service de Dermatologie, Hôpital Saint-Louis, and
Service d'Hématologie Clinique,
Hôpital Necker-Enfants Malades, Université René Descartes-Paris V, Paris, France
1 (TGF-
1). This
process occurs with virtually no cell proliferation and is not impaired by 30 Gy irradiation.
Selection of monocyte subpopulations is ruled out since monocyte-derived DCs can further
differentiate into LCs. Our data suggest that in vivo LC differentiation may be induced peripherally, from a nonproliferating myeloid precursor, i.e., the monocyte, in response to a TGF-
1-rich microenvironment, as found in the skin and epithelia. Therefore, the monocyte may represent a circulating precursor critical to the immune response in vivo.
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