title: Expression of human nephrin mRNA in diabetic nephropathy.
abstract: BACKGROUND
  Diabetic nephropathy (DN) is associated with functional changes in the filtration barrier, and microalbuminuria is a strong predictor of the development of overt DN. Nephrin is a novel podocyte-specific protein which localizes at the slit diaphragm. This study examines the expression of nephrin mRNA in the kidneys of type 2 diabetics with DN.
  
  
  METHODS
  Renal tissues were obtained from 13 type 2 diabetics with DN. We also examined samples from five patients with minimal change nephrotic syndrome (MCNS) and five normal kidneys (normals) as control. The severity of DN was classified into two grades based on histopathological findings. DN grade 1 (DN1 = seven patients) presented mild mesangial expansion, and DN grade 2 (DN2 = six patients) moderate mesangial expansion. Nephrin mRNA was quantitated and localized by in situ hybridization.
  
  
  RESULTS
  Cells positive for nephrin mRNA were detected exclusively in glomerular epithelial cells. The percentage of cells positive for nephrin mRNA in DN2 was significantly lower than in MCNS and normal kidneys. Furthermore, there was an inverse correlation between the percentage of cells positive for nephrin mRNA and extent of proteinuria.
  
  
  CONCLUSIONS
  The low expression of nephrin mRNA may be closely linked to development and/or progression of proteinuria in human diabetic nephropathy.
authors.affiliation: Division of Nephrology and Metabolism, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Toyoda
authors.forename: Daisuke
authors.initials: D
authors.lastname: Suzuki
authors.forename: Tomoya
authors.initials: T
authors.lastname: Umezono
authors.forename: Goro
authors.initials: G
authors.lastname: Uehara
authors.forename: Mayumi
authors.initials: M
authors.lastname: Maruyama
authors.forename: Masashi
authors.initials: M
authors.lastname: Honma
authors.forename: Takako
authors.initials: T
authors.lastname: Sakai
authors.forename: Hideto
authors.initials: H
authors.lastname: Sakai
mesh_terms: D000328:Adult; D001707:Biopsy, Needle; D016022:Case-Control Studies; D015331:Cohort Studies; D003924:Diabetes Mellitus, Type 2 / Q000150:complications / Q000473:pathology; D003928:Diabetic Nephropathies / Q000235:genetics* / Q000473:pathology*; D018450:Disease Progression; D005260:Female; D005786:Gene Expression Regulation; D005819:Genetic Markers / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007677:Kidney Function Tests; D008297:Male; D008565:Membrane Proteins; D008875:Middle Aged; D011336:Probability; D011379:Prognosis; D011506:Proteins / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis*; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric
chemical_list: D005819:Genetic Markers; D008565:Membrane Proteins; D011506:Proteins; D012333:RNA, Messenger; C113267:nephrin