title: Transcriptional regulation of endothelial constitutive PGHS-1 expression by phorbol ester.
abstract: Human endothelial cells contain two isoforms of prostaglandin H synthase (PGHS). PGHS-1 is constitutively expressed, whereas PGHS-2 is inducible. To determine whether expression of PGHS-1 is regulated, we treated cultured human umbilical vein endothelial cells (HUVEC) with phorbol 12-myristate 13-acetate (PMA) or its inactive analogue and measured PGHS-1 mRNA levels by Northern analysis and competitive polymerase chain reaction. PMA increased PGHS-1 mRNA levels determined by both techniques in a time- and concentration-dependent manner. The mRNA level was increased about twofold over the basal level after 4-6 h of PMA (10-50 nM) treatment. The level of PGHS-1 protein was similarly increased by PMA. Stimulation of PGHS-1 mRNA levels was abrogated by cycloheximide, actinomycin D, staurosporine, or calphostin C. The 5'-promoter activity of human PGHS-1 gene was increased twofold over the basal level by PMA in NS-20 cells. These results indicate that the constitutive PGHS-1 in HUVEC is transcriptionally stimulated by PMA in a protein kinase C-dependent manner.
authors.affiliation: Department of Internal Medicine, University of Texas Houston Health Science Center, Houston 77030, USA.
authors.forename: X M
authors.initials: XM
authors.lastname: Xu
authors.forename: J L
authors.initials: JL
authors.lastname: Tang
authors.forename: A
authors.initials: A
authors.lastname: Hajibeigi
authors.forename: D S
authors.initials: DS
authors.lastname: Loose-Mitchell
authors.forename: K K
authors.initials: KK
authors.lastname: Wu
mesh_terms: D001483:Base Sequence; D015152:Blotting, Northern; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism*; D006801:Humans; D015335:Molecular Probes / Q000235:genetics; D008969:Molecular Sequence Data; D009994:Osmolar Concentration; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D011451:Prostaglandin-Endoperoxide Synthases / Q000235:genetics* / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects*
chemical_list: D015335:Molecular Probes; D012333:RNA, Messenger; D011451:Prostaglandin-Endoperoxide Synthases; D013755:Tetradecanoylphorbol Acetate