Hepatic stellate cells mediate differentiation of dendritic cells from monocytes.

BACKGROUND We have previously reported that human umbilical cord blood (UCB)-nucleated cells differentiate into hepatocyte-like cells when cultured in a 5-cytokine cocktail medium. We further found that UCB cells rather differentiated into dendritic-shaped cells by coculture with a human stellate cell (HSC) line, LI90. METHODS Monocytes from UCB and adult peripheral blood were cocultured with LI90 or rat primary HSCs in a cell-culture insert. Monocytes were also cultured with LI90-conditioned medium containing secreted factors, which were analyzed by a cytokine array. RESULTS In the coculture with LI90, resulting dendritic-shaped cells from monocytes expressed dendritic cell (DC) markers and activated allogeneic T cells, indicating that the dendritic-shaped cells were DCs. LI90 in the cytokine cocktail medium secreted various inflammatory factors, such as granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-4. Fibroblast growth factor-2 in the cytokine cocktail was responsible for GM-CSF production from LI90 cells and for differentiation of monocytes into DCs in the LI90 coculture. Moreover, the coculture of monocytes with activated HSCs derived from damaged rat liver induced the differentiation of DCs, whereas quiescent HSCs derived from normal liver scarcely induced such a change. CONCLUSION These results suggest that activated HSCs are involved in differentiation of monocytes into DCs in the liver.

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