PMID: 2508093Oct 1, 1989Paper

Interleukin 1 regulates synthesis of amyloid beta-protein precursor mRNA in human endothelial cells

Proceedings of the National Academy of Sciences of the United States of America
D GoldgaberD C Gajdusek

Abstract

We have analyzed the modulation of amyloid beta-protein precursor (APP) gene expression in human umbilical vein endothelial cells (HUVEC). The level of the APP mRNA transcripts increased as HUVEC reached confluency. In confluent culture the half-life of the APP mRNA was 4 hr. Treatment of the cells with human-recombinant interleukin 1 (IL-1), phorbol 12-myristate 13-acetate, or heparin-binding growth factor 1 enhanced the expression of APP gene in these cells, but calcium ionophore A23187 and dexamethasone did not. The protein kinase C inhibitor 1-(isoquinolinsulfonyl)-2-methylpiperazine (H7) inhibited IL-1-mediated increase of the level of APP transcripts. To map IL-1-responsive elements of the APP promoter, truncated portions of the APP promoter were fused to the human growth hormone reporter gene. The recombinant plasmids were transfected into mouse neuroblastoma cells, and the cell medium was assayed for the human growth hormone. A 180-base-pair region of the APP promoter located between position -485 and -305 upstream from the transcription start site was necessary for IL-1-mediated induction of the reporter gene. This region contains the upstream transcription factor AP-1 binding site. These results suggest that IL-1 upre...Continue Reading

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