title: Identification of a novel retinoic acid-responsive element within the lamin A/C promoter.
abstract: A-type lamins are not present in either early embryos or the embryonal carcinoma (EC) cell line. P19 cells, which are EC cell line, are able to express A-type lamins upon retinoic acid (RA) treatment. Here we report that a novel RA-responsive element, termed lamin A/C-RA-responsive element (L-RARE), is located within the lamin A/C promoter. RA activated the luciferase activity of the reporter which had four tandem repeats of the wild-type L-RARE, while a loss of function mutant, which altered CACCCCC to CACtatC within L-RARE, did not respond. Four specific binding complexes of L-RARE, Complexes-A, -B, -C, and -D, were detected in protein extracts obtained from P19 cells treated with and without RA. Specific antibodies revealed that Sp1 and Sp3 were included in Complex-A and Complexes-B and -C, respectively. Thus, L-RARE was important in the RA-mediated activation of the lamin A/C promoter and was recognized by DNA binding proteins.
authors.affiliation: Biomolecular Engineering Research Institute, 6-2-3 Furuedai, Suita, Osaka, 565-0874, Japan. koichi@beri.co.jp
authors.forename: K
authors.initials: K
authors.lastname: Okumura
authors.forename: K
authors.initials: K
authors.lastname: Nakamachi
authors.forename: Y
authors.initials: Y
authors.lastname: Hosoe
authors.forename: N
authors.initials: N
authors.lastname: Nakajima
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D004247:DNA / Q000235:genetics / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism; D017930:Genes, Reporter / Q000187:drug effects; D034904:Lamin Type A; D034882:Lamins; D008156:Luciferases / Q000235:genetics; D051379:Mice; D009687:Nuclear Proteins / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000187:drug effects*; D011485:Protein Binding; D016329:Sp1 Transcription Factor / Q000378:metabolism; D051705:Sp3 Transcription Factor; D014157:Transcription Factors / Q000378:metabolism; D014212:Tretinoin / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D004268:DNA-Binding Proteins; D034904:Lamin Type A; D034882:Lamins; D009687:Nuclear Proteins; D016329:Sp1 Transcription Factor; C497122:Sp3 protein, mouse; D014157:Transcription Factors; D051705:Sp3 Transcription Factor; D014212:Tretinoin; D004247:DNA; D008156:Luciferases