Korean J Intern Med.  1999 Jan;14(1):77-84.

Changes of glomerular basement membrane components in Vacor-induced diabetic nephropathy

Affiliations
  • 1Department of Internal Medicine, Chonnam National University Medical School, Kwangju, Korea.
  • 2Department of Pathology, Chonnam National University Medical School, Kwangju, Korea.

Abstract


OBJECTIVES
The thickening of the glomerular basement membrane in rats after Vacor ingestion was examined by electron microscopy. This study was performed to elucidate which biochemical components changed in the glomerular basement membrane after Vacor-induced diabetic glomerulopathy. METHODS: Immunohistochemical analyses of type IV collagen, laminin, fibronectin and chondroitin sulfate proteoglycan were performed. A single dose of Vacor (molecular weight 272), 80 mg/kg, was administered to adult male Wistar rats by orogastric canule, and the animals were sacrificed at 0.5, 1, 3, 7, 14, 28 and 56 days after administration. RESULTS: Mild thickening of the glomerular basement membrane was evident 7 days after Vacor administration, and the width of the glomerular basement membrane was more than twice that of normal controls at 28 and 56 days. Significantly increased expressions of type IV collagen, laminin, fibronectin and neutral polysaccharide in the thickened glomerular basement membrane were noted 14 to 56 days after administration, and a mildly increased expression of chondroitin sulfate proteoglycan appeared between 3 to 7 days. CONCLUSION: These abnormally increased glomerular basement membrane components might be part of what causes diabetic nephropathy after Vacor administration.

Keyword

Vacor; Diabetic nephropathy; Glomerular basement membrane

MeSH Terms

Animal
Basement Membrane/pathology
Basement Membrane/metabolism
Basement Membrane/drug effects
Diabetic Nephropathies/pathology
Diabetic Nephropathies/metabolism
Diabetic Nephropathies/chemically induced*
Extracellular Matrix Proteins/metabolism
Kidney Glomerulus/pathology
Kidney Glomerulus/metabolism
Kidney Glomerulus/drug effects
Male
Phenylurea Compounds/toxicity*
Proteochondroitin Sulfates/metabolism
Rats
Rats, Wistar
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