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. 1997 May;91(1):121–129. doi: 10.1046/j.1365-2567.1997.00235.x

Enhancement of B-cell translocation gene-1 expression by prostaglandin E2 in macrophages and the relationship to proliferation.

K Suk 1, D G Sipes 1, K L Erickson 1
PMCID: PMC1364044  PMID: 9203975

Abstract

Although prostaglandin (PG) E2 is known to suppress various macrophage functions, the molecular mechanisms by which that occurs are largely unknown. To understand better those mechanisms, differential screening of a cDNA library from PGE2-treated macrophages was performed. Subsequently, the DNA sequence of a differentially expressed cDNA clone was determined and the cDNA was identified as B-cell translocation gene-1 (BTG1), a recently cloned antiproliferative gene. A two-to threefold increase in macrophage BTG1 expression was observed after PGE2 treatment. PGE1 and platelet-activating factor, but not leukotrienes B4, and C4, or lipopolysaccharide, also enhanced BTG1 expression. Furthermore, this effect ws mimicked by dibutyryl cAMP which indicated the involvement of elevated cAMP in the PGE2-mediated enhancement of BTG1. Moreover, there was an inverse correlation between BTG1 mRNA expression and macrophage proliferation; however, BTG1 alteration was not associated with macrophage tumoricidal activation. Thus, BTG1 may play a role in PGE2-mediated inhibition of macrophage proliferation and not activation.

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