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Hyperglycemia and renin-dependent hypertension synergize to model diabetic nephropathy

Bryan R Conway1, Jillian Rennie, Matthew A Bailey

  • 1MRC Centre for Inflammation Research, University of Edinburgh, Edinburgh, Scotland, UK. bryan.conway@ed.ac.uk

Journal of the American Society of Nephrology : JASN
|December 24, 2011
PubMed

Insights

Rodent models poorly mimic human diabetic nephropathy. Combining induced hypertension with diabetes in rats successfully recapitulated key human disease features, offering a better model for studying diabetic kidney disease therapies.

Area of Science:

  • Nephrology
  • Endocrinology
  • Translational Medicine

Background:

  • Rodent models of diabetic nephropathy (DN) display limited human disease features, hindering therapeutic development.
  • Hypertension is crucial for advanced human DN but rare in standard rodent models, contributing to their resistance.
  • The Cyp1a1mRen2 rat, a transgenic model, allows for induced hypertension via dietary indole-3-carbinol.

Purpose of the Study:

  • To develop a more accurate rodent model for human diabetic nephropathy.
  • To investigate the synergistic effects of hyperglycemia and renin-dependent hypertension on kidney damage.
  • To evaluate the utility of the Cyp1a1mRen2 rat for modeling human DN.

Main Methods:

  • Induction of diabetes using streptozotocin in Cyp1a1mRen2 rats.
  • Induction of moderate hypertension using dietary indole-3-carbinol.
  • Assessment of albuminuria, renal histology, and gene expression in diabetic rats with and without induced hypertension.

Main Results:

  • Diabetes alone in rats caused mild kidney changes despite hyperglycemia and increased albuminuria.
  • Concomitant diabetes and induced hypertension led to a significant increase in albuminuria (500-fold).
  • Hypertension and hyperglycemia synergistically induced glomerulosclerosis, tubulointerstitial fibrosis, and gene expression patterns mirroring human DN.

Conclusions:

  • Rodent models of diabetes alone are insufficient for modeling advanced human diabetic nephropathy.
  • The combination of renin-dependent hypertension and hyperglycemia in the Cyp1a1mRen2 rat effectively recapitulates key aspects of human DN.
  • This enhanced rodent model provides a valuable platform for investigating novel therapeutic strategies for diabetic kidney disease.

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