title: Expression of profilin, an actin-binding protein, in rat experimental glomerulonephritis and its upregulation by basic fibroblast growth factor in cultured rat mesangial cells.
abstract: Profilin binds to actin monomer to regulate actin polymerization, and to phosphatidylinositol 4,5-bisphosphate to inhibit hydrolysis by phospholipase Cgamma1. This study investigated the expression of profilin in rat anti-Thy-1.1 mesangial proliferative glomerulonephritis (GN) and examined the effect of growth factors on its expression in cultured rat mesangial cells. Profilin mRNA was constitutively expressed in isolated glomeruli of untreated rats. However, in glomeruli of anti-Thy-1.1 GN rats, its expression was upregulated beginning on day 1, reaching a peak level on day 4 (3.9-fold versus control glomeruli), and decreased on day 14, as determined by competitive reverse transcription-PCR. Increased expression of profilin protein was confirmed using immunoblotting and immunohistochemistry. Immunoelectron microscopy revealed the presence of profilin in plasma membrane and the rough endoplasmic reticulum of mesangial cells, indicating that profilin was produced in mesangial cells. In cultured rat mesangial cells, expression of profilin mRNA and protein was upregulated by basic fibroblast growth factor but not by platelet-derived growth factor or transforming growth factor-beta. Suppression of profilin expression using an antisense oligonucleotide against profilin inhibited [3H]thymidine uptake. These findings indicated the involvement of profilin in anti-Thy-1.1 GN and suggest that the upregulation of profilin might be involved in the progression of anti-Thy-1.1 GN possibly by affecting cell growth.
authors.affiliation: Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.|Department of Biochemistry, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Masahito
authors.initials: M
authors.lastname: Tamura
authors.affiliation: Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tanaka
authors.affiliation: Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Yashiro
authors.affiliation: Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Osajima
authors.affiliation: Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Okazaki
authors.affiliation: Department of Anatomy, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kudo
authors.affiliation: Department of Anatomy, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Doi
authors.affiliation: Department of Anatomy, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Sunao
authors.initials: S
authors.lastname: Fujimoto
authors.affiliation: Department of Biochemistry, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Higashi
authors.affiliation: Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Nakashima
authors.affiliation: Department of Biochemistry, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
authors.forename: Hideyasu
authors.initials: H
authors.lastname: Hirano
mesh_terms: D000199:Actins / Q000378:metabolism; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D003285:Contractile Proteins; D016326:Extracellular Matrix Proteins / Q000378:metabolism; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology*; D005920:Glomerular Mesangium / Q000378:metabolism* / Q000473:pathology; D005921:Glomerulonephritis / Q000276:immunology / Q000378:metabolism*; D066298:In Vitro Techniques; D007678:Kidney Glomerulus / Q000378:metabolism; D008297:Male; D008840:Microfilament Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D051304:Profilins; D012333:RNA, Messenger / Q000037:antagonists & inhibitors / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D012016:Reference Values; D018800:Thy-1 Antigens / Q000276:immunology; D015854:Up-Regulation
chemical_list: D000199:Actins; D000911:Antibodies, Monoclonal; D003285:Contractile Proteins; D016326:Extracellular Matrix Proteins; D008840:Microfilament Proteins; D016376:Oligonucleotides, Antisense; C495740:Pfn1 protein, rat; D051304:Profilins; D012333:RNA, Messenger; D018800:Thy-1 Antigens; D016222:Fibroblast Growth Factor 2