title: Transcriptional regulation of intercellular adhesion molecule-1: PMA-induction is mediated by NF kappa B.
abstract: The surface glycoprotein intercellular adhesion molecule-1 (ICAM-1) mediates important immunologic cell interactions during cutaneous inflammatory processes by binding to the leukocyte integrin lymphocyte function-associated antigen-1. The expression of ICAM-1 is induced in epidermal keratinocytes by certain pro-inflammatory stimuli, and this modulation is transcriptionally regulated. To identify the molecular mechanisms involved in the regulation of ICAM-1 gene expression, we have previously cloned the transcriptional regulatory region of the human ICAM-1-gene and have characterized a functional promoter. Here we have used the phorbol ester phorbol-12-myristate-13-acetate (PMA) to further evaluate the transcriptional mechanisms of ICAM-1 gene induction in A431 cells. Exposure to PMA induced ICAM-1 both at the mRNA and cell surface level. Promoter activity and PMA-enhanced effects were assessed by transiently transfecting A431 cells with chloramphenicol acetyl transferase reporter gene constructs containing a series of sequential ICAM-1 5' deletions. Constructs containing ICAM-1 5' fragments from -1162/+1 (relative to the transcription start site) to -277/+1 displayed a threefold increase in promoter activity when cells were stimulated with PMA. Inducibility dropped below 1.5-fold in chloramphenicol acetyl transferase construct -182/+1. Using electrophoretic mobility shift assays, a PMA-inducible binding site was identified for an NF kappa B-like complex within positions -186/-177. A -199/-170 fragment containing this NF kappa B-like element conferred PMA responsiveness when cloned into a thymidine kinase-driven chloramphenicol acetyl transferase vector, indicating that the region containing this NF kappa B-like element is not only necessary but also sufficient for PMA induction of ICAM-1.
authors.affiliation: Department of Dermatology, Ludwig-Maximilians University, München, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Müller
authors.forename: C
authors.initials: C
authors.lastname: Kammerbauer
authors.forename: U
authors.initials: U
authors.lastname: Simons
authors.forename: N
authors.initials: N
authors.lastname: Shibagaki
authors.forename: L J
authors.initials: LJ
authors.lastname: Li
authors.forename: S W
authors.initials: SW
authors.lastname: Caughman
authors.forename: K
authors.initials: K
authors.lastname: Degitz
mesh_terms: D001483:Base Sequence; D005786:Gene Expression Regulation; D005809:Genes, Regulator / Q000235:genetics; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics*; D008969:Molecular Sequence Data; D016328:NF-kappa B / Q000494:pharmacology*; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000032:analysis; D017421:Sequence Analysis; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014158:Transcription, Genetic / Q000187:drug effects; D015533:Transcriptional Activation; D014407:Tumor Cells, Cultured / Q000737:chemistry
chemical_list: D016328:NF-kappa B; D012333:RNA, Messenger; D018799:Intercellular Adhesion Molecule-1; D013755:Tetradecanoylphorbol Acetate