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Angiotensin-dependent gene expression in the developing rat kidney

K F Hilgers1, E S Pentz, R A Gomez

  • 1Department of Pediatrics, University of Virginia Health Sciences Center, Charlottesville, USA. mfm435@rzmail.uni-erlangen.de

Kidney International. Supplement
|September 15, 1998
PubMed
Summary

Researchers investigated genes affecting kidney development and angiotensin II (Ang II) growth effects. Ang II receptor blocker losartan did not alter key growth factor gene expression, but a novel gene, AD.5, showed developmental regulation.

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Developmental Biology

Background:

  • Angiotensin II (Ang II) plays a role in kidney development and growth.
  • Understanding the molecular mechanisms of Ang II's effects is crucial for kidney health.

Purpose of the Study:

  • To identify genes influenced by Ang II during rat kidney development.
  • To investigate the impact of Ang II type-1 receptor blockade on specific growth factor gene expression.

Main Methods:

  • Rats were treated from birth with the Ang II type-1 receptor blocker, losartan.
  • Gene expression of TGF-beta1, PDGF-B, VEGF, and EGF was analyzed using Northern blot.
  • Differential display methods were employed to identify Ang II-dependent genes.

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Main Results:

  • Losartan treatment did not significantly alter the expression of TGF-beta1, PDGF-B, VEGF, or EGF.
  • Differential display yielded numerous false positives, highlighting the challenges in identifying specific gene targets.
  • A novel rat cDNA, AD.5, was identified, showing developmental regulation and potential links to Ang II.

Conclusions:

  • The growth effects of Ang II in kidney development may not be mediated by the examined growth factors.
  • The novel gene AD.5 warrants further investigation for its role in kidney development and Ang II signaling.