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J Biol Chem, Vol. 273, Issue 9, 5389-5399, February 27, 1998

The Macrosialin Promoter Directs High Levels of Transcriptional Activity in Macrophages Dependent on Combinatorial Interactions between PU.1 and c-Jun

Andrew C. Li, Fabien R. B. Guidez^¶, Jana G. Collier^¶, and Christopher K. Glass^¶**

From the Divisions of ^** Endocrinology and Metabolism, ^¶ Cellular and Molecular Medicine, and  Cardiology, Department of Medicine, University of California, San Diego, La Jolla, California 92093-0651

Macrosialin is a transmembrane glycoprotein that is highly expressed in macrophages. In the present studies, macrosialin mRNA levels are shown to be markedly up-regulated during macrophage differentiation of bone marrow progenitor cells in response to macrophage colony-stimulating factor and granulocyte-macrophage colony-stimulating factor. To investigate the mechanisms responsible for regulation of macrosialin expression, we have isolated the macrosialin gene and performed an initial analysis of its transcriptional regulatory elements. The macrosialin promoter and 7.0 kilobase pairs of 5'-flanking information direct high levels of reporter gene activity in monocyte/macrophage-like cells, but little or no expression in nonmyeloid cells. This pattern of expression is dependent on regulatory elements located between 7.0 and 2.5 kilobase pairs from the transcriptional start site that exhibit strong enhancer activity in macrophages and repressor activity in nonmyeloid cells. Analysis of the proximal macrosialin promoter indicates that combinatorial interactions between at least four classes of transcriptional activators, including PU.1/Spi-1 and members of the AP-1 family are required for basal promoter function. PU.1/Spi-1 and c-Jun act synergistically to activate the macrosialin promoter in a nonmyeloid cell line, suggesting that combinatorial interactions between these proteins are involved in regulating macrosialin expression during macrophage differentiation.

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