title: Transcription of the caveolin-1 gene is differentially regulated in lung type I epithelial and endothelial cell lines. A role for ETS proteins in epithelial cell expression.
abstract: In the lung, caveolin-1 is expressed in both type I alveolar epithelial and endothelial cells where it is hypothesized to modulate molecular signaling activities and progression of tumorigenesis. Developmentally, caveolin-1alpha is expressed in fetal lung endothelial, but not epithelial, cells; in adult lung, both cell types express caveolin-1alpha. To test the hypothesis that caveolin-1 transcription is differentially regulated in type I and endothelial cells, we characterized the proximal promoter of the mouse caveolin-1 gene in lung cell lines to identify factors that control its cell-specific expression. We show that caveolin-1 expression is regulated by an Ets cis-element in a lung epithelial cell line, but not a lung endothelial cell line, and that three ETS family members, ETS-1, PEA3, and ERM, recognize and bind the Ets site in the epithelial cell line. Based on these findings, we have identified the Ets cis-element as a region that accounts for differential transcriptional regulation of caveolin-1 in lung epithelial and endothelial cells.
authors.affiliation: Pulmonary Center, Department of Medicine, Boston University School of Medicine, Massachusetts 02118, USA. hasmeena.kathuria@bmc.org
authors.forename: Hasmeena
authors.initials: H
authors.lastname: Kathuria
authors.forename: Yuxia X
authors.initials: YX
authors.lastname: Cao
authors.forename: Maria I
authors.initials: MI
authors.lastname: Ramirez
authors.forename: Mary C
authors.initials: MC
authors.lastname: Williams
mesh_terms: D020816:Amino Acid Motifs; D000818:Animals; D001665:Binding Sites; D015153:Blotting, Western; D051242:Caveolin 1; D022461:Caveolins / Q000096:biosynthesis* / Q000235:genetics*; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D004247:DNA / Q000737:chemistry; D004252:DNA Mutational Analysis; D017931:DNA Primers / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000378:metabolism; D042783:Endothelial Cells / Q000378:metabolism*; D004742:Enhancer Elements, Genetic; D017353:Gene Deletion; D008168:Lung / Q000166:cytology; D051379:Mice; D009154:Mutation; D009841:Oligonucleotides / Q000737:chemistry; D016133:Polymerase Chain Reaction; D011233:Precipitin Tests; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D020033:Protein Isoforms; D050784:Proto-Oncogene Protein c-ets-1; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D050783:Proto-Oncogene Proteins c-ets; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic; D014162:Transfection
chemical_list: C495541:Cav1 protein, mouse; D051242:Caveolin 1; D022461:Caveolins; D017931:DNA Primers; D004268:DNA-Binding Proteins; C494042:Ets1 protein, mouse; C513242:Etv5 protein, mouse; D009841:Oligonucleotides; D020033:Protein Isoforms; D050784:Proto-Oncogene Protein c-ets-1; D011518:Proto-Oncogene Proteins; D050783:Proto-Oncogene Proteins c-ets; D012333:RNA, Messenger; D014157:Transcription Factors; C065788:transcription factor PEA3; D004247:DNA