A CD1a+/CD11c+ subset of human blood dendritic cells is a direct precursor of Langerhans cells - PubMed (original) (raw)
Comparative Study
. 1999 Aug 1;163(3):1409-19.
M Inaba, K Inaba, J Toki, S Sogo, T Iguchi, Y Adachi, K Yamaguchi, R Amakawa, J Valladeau, S Saeland, S Fukuhara, S Ikehara
Affiliations
- PMID: 10415041
Comparative Study
A CD1a+/CD11c+ subset of human blood dendritic cells is a direct precursor of Langerhans cells
T Ito et al. J Immunol. 1999.
Abstract
Based on the relative expression of CD11c and CD1a, we have identified three fractions of dendritic cells (DCs) in human peripheral blood, including a direct precursor of Langerhans cells (LCs). The first two fractions were CD11c+ DCs, comprised of a major CD1a+/CD11c+ population (fraction 1), and a minor CD1a-/CD11c+ component (fraction 2). Both CD11c+ fractions displayed a monocyte-like morphology, endocytosed FITC-dextran, expressed CD45RO and myeloid markers such as CD13 and CD33, and possessed the receptor for GM-CSF. The third fraction was comprised of CD1a-/CD11c- DCs (fraction 3) and resembled plasmacytoid T cells. These did not uptake FITC-dextran, were negative for myeloid markers (CD13/CD33), and expressed CD45RA and a high level of IL-3Ralpha, but not GM-CSF receptors. After culture with IL-3, fraction 3 acquired the characteristics of mature DCs; however, the expression of CD62L (lymph node-homing molecules) remained unchanged, indicating that fraction 3 can be a precursor pool for previously described plasmacytoid T cells in lymphoid organs. Strikingly, the CD1a+/CD11c+ DCs (fraction 1) quickly acquired LC characteristics when cultured in the presence of GM-CSF + IL-4 + TGF-beta1. Thus, E-cadherin, Langerin, and Lag Ag were expressed within 1 day of culture, and typical Birbeck granules were observed. In contrast, neither CD1a-/CD11c+ (fraction 2) nor CD1a-/CD11c- (fraction 3) cells had the capacity to differentiate into LCs. Furthermore, CD14+ monocytes only expressed E-cadherin, but lacked the other LC markers after culture in these cytokines. Therefore, CD1a+/CD11c+ DCs are the direct precursors of LCs in peripheral blood.
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