Assessment of 72-kilodalton gelatinase and TIMP-1 gene Expression in normal and sclerotic murine glomeruli

Michael A. Carome, Liliane J. Striker, Emmanuel P. Peten, Sharon J. Elliot, Chih Wei Yang, William G. Stetler-Stevenson, Paula Reponen, Karl Tryggvason, Gary E. Striker

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Abstract

Mice transgenic for bovine growth hormone (bGH) develop progressive diffuse glomerulosclerosis. Because murine mesangial cells in vitro were found to express the genes for 72-kd gelatinase and the metalloproteinase inhibitor TIMP-1, the expression of these genes in vivo in isolated whole glomeruli from bGH mice and normal control littermates was examined. Intact glomeruli were isolated by microdissection and subjected to reverse transcription. TIMP-1 cDNA was not detected by standard polymerase chain reaction (PCR) in glomeruli from bGH or control mice. In contrast, cDNA for 72-kd gelatinase was detected by standard PCR in both bGH and control mice, and the level was subsequently measured by quantitative competitive PCR. The gelatinase cDNA level was 14.7 ± 2.8 × 10-4 attomoles/glomerulus in 2-to 3-month-old control mice and was unchanged in 6-month-old controls. The bGH mice had 3.5-fold and 4.5-fold higher cDNA levels at 2 to 3 months and 6 months of age, respectively. Finally, zymography of glomerular extracts revealed increased levels of 72-kd and 96- to 100-kd gelatinase activity in bGH glomeruli in comparison to that in controls. In summary, whereas the genes for both TIMP-1 and 72-kd gelatinase are expressed in vitro in cultured mesangial cells, only the gelatinase gene appeared to be expressed In vivo in intact glomeruli. In addition, there was an up-regulation in the glomerular expression of the 72-kd gelatinase in bGH mice, a murine model of glomerulosclerosis.

Original languageEnglish (US)
Pages (from-to)1391-1399
Number of pages9
JournalJournal of the American Society of Nephrology
Volume5
Issue number6
StatePublished - Dec 1 1994

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Keywords

  • Competitive polymerase chain reaction
  • Extracellular matrix
  • Inhibitor
  • Kidney
  • Metalloproteinase

ASJC Scopus subject areas

  • Nephrology

Cite this

Carome, M. A., Striker, L. J., Peten, E. P., Elliot, S. J., Yang, C. W., Stetler-Stevenson, W. G., Reponen, P., Tryggvason, K., & Striker, G. E. (1994). Assessment of 72-kilodalton gelatinase and TIMP-1 gene Expression in normal and sclerotic murine glomeruli. Journal of the American Society of Nephrology, 5(6), 1391-1399.