Abstract:
:Fetal liver is the main site of haematopoiesis during mid-gestation. The adult liver still provides a favourable environment for extramedullary haematopoiesis. Nevertheless, regulation of liver haematopoiesis by cell-cell contacts or by cytokines remains poorly understood. Recently, we have shown that rat liver epithelial cells (RLECs) support long-term survival and multilineage differentiation of adult human CD34(+)and CD34(+)/CD38(-)haematopoietic cells obtained from granulocyte-colony stimulating factor mobilized peripheral blood and from bone marrow respectively. In addition, the importance of physical proximity between haematopoietic cells and RLECs was clearly demonstrated. Here, our findings give evidence that RLECs belonging to the epithelial but non-parenchymal liver compartment also sustain the long-term production of progenitors from human CD34(+)umbilical cord blood cells. Moreover, to better analyse the regulation of haematopoiesis in this RLEC coculture model, we have investigated the cytokine expression by RLECs alone and by RLECs coming from coculture with CD34(+)cells from umbilical cord blood. We demonstrated that a broad spectrum of cytokines acting at different stages of haematopoiesis is produced by RLECs. Interestingly, an upregulation of leukemia inhibitory factor expression by RLECs in presence of CD34(+)haematopoietic cells was observed. These data suggest an important role of cell-cell interactions in the regulation of haematopoiesis.
journal_name
Cytokinejournal_title
Cytokineauthors
Rialland M,Corlu A,Ilyin G,Cabillic F,Lamy I,Guguen-Guillouzo Cdoi
10.1006/cyto.1999.0639keywords:
subject
Has Abstractpub_date
2000-07-01 00:00:00pages
951-9issue
7eissn
1043-4666issn
1096-0023pii
S1043-4666(99)90639-7journal_volume
12pub_type
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