Impaired responses of leukemic dendritic cells derived from a human myeloid cell line to LPS stimulation

• Published in: Experimental & molecular medicine 2006, 38(1), , pp.72-84
• Main Authors: 김광동, 최승철, 노영욱, 김종완, 박상기, 양영, 김근일, 임종석
• Format: Article
• Language: Korean
• Subjects: 생화학
• ISSN: 1226-3613; 2092-6413

Several myeloid leukemia-derived cells have been reported to possess the ability to differentiate into dendritic cells (DC). MUTZ-3, a myeloid leukemia cell line, responds to GM-CSF, IL-4 and TNF-α, and acquires a phenotype similar to immature mono-cyte-derived DC (MoDC). In the present study, MUTZ-3-derived DC (MuDC) showed high level expression of HLA class II molecules, CD80 and CD86, and were able to function as potent antigen presenting cells as previously reported. Interes-tingly, MuDC maturation was induced by CD40- by LPS stimulation. We analyzed CCR1, CCR7 and Toll-like receptor (TLR) expressions in MuDC, and measured IL-10 and IL-12 production after maturation stimuli. Although MuDC expressed the mRNA for TLR4, a major component of the LPS receptor system, they did not show an enhanced level of CCR7 or cytokine production after LPS stimulation. In contrast, they responded to CD40 stimulation, which resulted in increased levels of CD83, CD86 and CCR7. Moreover, while LPS- stimulated MoDC could potently stimulate NK cells in a DC-NK cell co-culture, LPS-stimulated MuDC failed to stimulate primary NK cells. Taken together, our findings suggest that, although MuDC express TLR4, unlike TNF-α and IL-1βMuDC to acquire mature phenotypes, and they may have impaired activity to initiate innate immune response. KCI Citation Count: 23