title: Use of interleukin 7 receptor-alpha knockout donor cells demonstrates the lymphoid independence of dendritic cells.
abstract: The precise lineage of dendritic cells (DCs), including skin Langerhans cells (LCs), is unclear. Interleukin 7 (IL-7) and its receptor (IL-7R alpha) are known to mediate lymphopoiesis, and IL-7 is also known to be essential for the generation of DCs from lymphoid-committed precursors in vitro. Thus, to determine the developmental lymphoid (or IL-7R alpha) dependency of various DCs and to examine the importance of IL-7/IL-7R alpha for DC development in vivo, we used IL-7R alpha knockout (KO) donor cells to reconstitute DCs/LCs in sublethally irradiated recipients and compared the results to those obtained using wild-type (WT) donor cells. We found that lymphoid lineage cells (except natural killer [NK] cells), including thymocytes, were less efficiently reconstituted by IL-7R alpha KO donor cells, whereas myeloid lineage cells and DCs/LCs were equally well reconstituted by both the IL-7R alpha KO and WT donor cells. Overall, we conclude that IL-7R alpha is not required for the development of DCs/LC in vivo.
authors.affiliation: Dermatology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Takeuchi
authors.forename: Stephen I
authors.initials: SI
authors.lastname: Katz
mesh_terms: D000818:Animals; D019070:Cell Lineage; D003713:Dendritic Cells / Q000166:cytology*; D007801:Langerhans Cells / Q000166:cytology; D008214:Lymphocytes / Q000166:cytology*; D038041:Lymphopoiesis; D051379:Mice; D018345:Mice, Knockout; D038042:Myelopoiesis; D020395:Receptors, Interleukin-7 / Q000172:deficiency / Q000502:physiology*
chemical_list: D020395:Receptors, Interleukin-7; C415350:interleukin-7 receptor, alpha chain