Abstract
The Ets family transcription factor PU.1 is required for the development of various lymphoid and myeloid cell lineages, and regulates the expression of several genes in a cell type-specific manner. Recently we found that overproduction of PU.1 in mouse bone marrow-derived mast cell progenitors induced the expression of monocyte-specific genes. This prompted us to analyze the functions of each domain of PU.1 in monocyte-specific gene expression, using transfection of mast cell progenitors with a series of retrovirus vectors for overexpression of various truncation mutants. Both the acidic region and the Ets domain of PU.1 were required for expression of monocyte-specific genes, and for enhanced interleukin-6 production in response to lipopolysaccharide. The Gln-rich region was suggested to be involved in expression of both MHC class II and F4/80. On the other hand, when PU.1 protein lacking the PEST domain was produced in the progenitor cells, expression of monocyte-specific genes was substantially enhanced, suggesting that the PEST domain plays a negative role in monocyte-specific gene expression.
Original language | English |
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Pages (from-to) | 63-68 |
Number of pages | 6 |
Journal | FEBS Letters |
Volume | 561 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 12 Mar 2004 |
Keywords
- CD11b
- CD11c
- DC, dendritic cell
- F4/80
- IRF, interferon regulatory factor
- LPS, lipopolysaccharide
- MHC class II
- PEST
- PU.1
- TLR, Toll-like receptor