title: Induction of fibulin-5 gene is regulated by tropoelastin gene, and correlated with tropoelastin accumulation in vitro.
abstract: Fibulin-5 (also known as DANCE) is an elastin-binding protein that is thought to play a role in elastogenesis. We examined the relationship between the gene expression of fibulin-5 and the gene expression and accumulation of tropoelastin by comparing elastin-producing cells (human gingival fibroblasts) with non-elastin-producing cells (human periodontal ligament fibroblasts) by Northern blot analysis. Fibulin-5 gene induction was found only in elastin-producing cells. Induction of the fibulin-5 gene in elastin-producing cells occurred after induction of the tropoelastin gene, and the fibulin-5 level was reduced upon RNA interference-mediated down-regulation of tropoelastin. Fibulin-5 gene induction was also correlated with a rapid increase of tropoelastin accumulation within the cell layer. These results may suggest that the fibulin-5 gene induction is directly or indirectly regulated by tropoelastin gene expression and plays a role in the accumulation of elastic fibers within matrices.
authors.affiliation: Department of Oral Anatomy, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan. tsuru@hoku-iryo.ac.jp
authors.forename: Eichi
authors.initials: E
authors.lastname: Tsuruga
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Yajima
authors.forename: Kazuharu
authors.initials: K
authors.lastname: Irie
mesh_terms: D015152:Blotting, Northern; D002478:Cells, Cultured; D004549:Elastin / Q000378:metabolism; D016326:Extracellular Matrix Proteins / Q000096:biosynthesis / Q000235:genetics*; D005347:Fibroblasts / Q000378:metabolism; D015870:Gene Expression; D006801:Humans; D015347:RNA Probes; D012333:RNA, Messenger / Q000032:analysis; D034741:RNA, Small Interfering; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014333:Tropoelastin / Q000235:genetics* / Q000378:metabolism
chemical_list: D016326:Extracellular Matrix Proteins; C492373:FBLN5 protein, human; D015347:RNA Probes; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D011994:Recombinant Proteins; D014333:Tropoelastin; D004549:Elastin