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Murine Macrophage Mannose Receptor Promoter Is Regulated by the Transcription Factors PU.1 and SP1
Quentin Eichbaum,
David Heney,
David Raveh,
Michael Chung,
Mark Davidson,
Judith Epstein, and
R. Alan B. Ezekowitz
From the Division of Infectious Diseases and Hematology/Oncology, Children's Hospital, Boston, MA; and the Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
The mannose receptor (MR) is a transmembrane protein that functions primarily as a phagocytic receptor for a wide range of microorganisms. Its expression appears to be restricted to tissue macrophages and Langerhans cells. To gain an understanding of the regulation of the gene, we have isolated the 5' flanking sequence of the murine MR gene and have analyzed a 536-bp sequence upstream of the ATG start site for transcriptional activity. This sequence lacks a TATA box but contains an initiator (Inr) consensus element overlapping the single transcriptional start site. Transcription factor binding sites contained within this sequence include PU.1, Sp1, ETS, GATA, and MYB motifs. Serial 100-bp deletions of this promoter fragment fused to a luciferase reporter gene showed various patterns of activity when transfected into different cell types. In myeloid cells, sequence elements upstream of bp -300 appeared to have a silencing effect on promoter activity. Of the four potential PU.1 binding sites contained within the fragment, one site (at -164) bound the PU.1 factor most strongly, whereas the adjacent PU.1 site (at -177 bp) bound PU.1 to a lesser degree. Mutations of these sites decreased transcriptional activity but did not abolish it. However, promoter activity was abrogated when both the -164 bp PU.1 site and the adjacent -177 bp PU.1 site were mutated. In addition, mutation of the Sp1 site also significantly reduced promoter activity. Cotransfection studies in Drosophila Schneider cells indicated that PU.1 and Sp1 may function synergistically in transactivating the murine MR. This study indicates that MR gene expression is regulated in part by the interaction between the ubiquitously expressed factor Sp1 and the lymphoid/myeloid factor PU.1 and provides a basis for studying the regulation of this gene.
Blood, Vol. 90 No. 10 (November 15), 1997:
pp. 4135-4143
© 1997 by The American Society of Hematology.
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