title: S1P modulator FTY720 limits matrix expansion in acute anti-thy1 mesangioproliferative glomerulonephritis.
abstract: FTY720 is a novel immune modulator whose primary action is blood lymphocyte depletion through interaction with sphingosine-1-phosphate (S1P) receptors. The present study analyzes the effect of FTY720 on both the early mesangial cell injury and the subsequent matrix expansion phase of experimental mesangioproliferative glomerulonephritis. Disease was induced by injection of OX-7 anti-thy1 antibody into male Wistar rats. In both protocols, FTY720 administration (0.3 mg/kg body wt) resulted in a selective and very marked reduction in blood lymphocyte count. In the injury experiment, the S1P receptor modulator was given starting 5 days before and continued until 1 day after antibody injection. FTY720 did not significantly affect the degree of anti-thy1-induced mesangial cell lysis and glomerular-inducible nitric oxide production. In the matrix expansion experiment, FTY720 treatment was started 1 day after antibody injection and continued until day 7. In this protocol, the S1P modulator reduced proteinuria, histological matrix expansion, and glomerular protein expression of TGF-beta(1), fibronectin, and PAI-1. Glomerular collagen III staining intensity was decreased. FTY720 reduced markedly glomerular lymphocyte number per cross section and to a lesser degree macrophage infiltration. In conclusion, FTY720 significantly limits TGF-beta(1) overexpression and matrix protein expression following induction of acute anti-thy glomerulonephritis, involving reductions in blood and glomerular lymphocyte numbers. The results suggest that lymphocytes actively contribute to matrix expansion in experimental mesangioproliferative glomerulonephritis. Our study expands on findings on FTY720's beneficial effects on tubulointerstitial and functional disease progression previously reported in anti-thy1-induced chronic glomerulosclerosis.
authors.affiliation: Department of Nephrology, Charité Universitätsmedizin Berlin, Charité Campus Mitte, Humboldt University, Berlin, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Martini
authors.forename: Stephanie
authors.initials: S
authors.lastname: Krämer
authors.forename: Tanja
authors.initials: T
authors.lastname: Loof
authors.forename: Yingrui
authors.initials: Y
authors.lastname: Wang-Rosenke
authors.forename: Ute
authors.initials: U
authors.lastname: Daig
authors.forename: Klemens
authors.initials: K
authors.lastname: Budde
authors.forename: Hans-H
authors.initials: HH
authors.lastname: Neumayer
authors.forename: Harm
authors.initials: H
authors.lastname: Peters
mesh_terms: D000818:Animals; D019138:Antibodies, Blocking / Q000633:toxicity*; D001794:Blood Pressure / Q000502:physiology; D001835:Body Weight / Q000187:drug effects; D024061:Collagen Type III / Q000096:biosynthesis; D005109:Extracellular Matrix / Q000201:enzymology / Q000473:pathology*; D005353:Fibronectins / Q000096:biosynthesis; D000068876:Fingolimod Hydrochloride; D015432:Glomerulonephritis, Membranoproliferative / Q000188:drug therapy* / Q000201:enzymology / Q000473:pathology*; D006339:Heart Rate / Q000502:physiology; D007150:Immunohistochemistry; D007678:Kidney Glomerulus / Q000473:pathology; D007958:Leukocyte Count; D008070:Lipopolysaccharides / Q000494:pharmacology; D008297:Male; D052247:Nitric Oxide Synthase Type II / Q000096:biosynthesis; D017395:Plasminogen Activator Inhibitor 1 / Q000096:biosynthesis; D011409:Propylene Glycols / Q000494:pharmacology*; D011507:Proteinuria / Q000517:prevention & control; D051381:Rats; D017208:Rats, Wistar; D049349:Receptors, Lysosphingolipid / Q000187:drug effects*; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D018800:Thy-1 Antigens / Q000276:immunology*; D016212:Transforming Growth Factor beta / Q000096:biosynthesis
chemical_list: D019138:Antibodies, Blocking; D024061:Collagen Type III; D005353:Fibronectins; D008070:Lipopolysaccharides; D017395:Plasminogen Activator Inhibitor 1; D011409:Propylene Glycols; D049349:Receptors, Lysosphingolipid; D018800:Thy-1 Antigens; D016212:Transforming Growth Factor beta; D052247:Nitric Oxide Synthase Type II; D000068876:Fingolimod Hydrochloride; D013110:Sphingosine