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Renin expression in renal ablation.

R Correa-Rotter1, T H Hostetter, J C Manivel

  • 1Division of Renal Diseases and Hypertension, University of Minnesota, Minneapolis 55455.

Hypertension (Dallas, Tex. : 1979)
|October 1, 1992
PubMed
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Renal ablation influences renin-angiotensin system (RAS) expression. Scar-adjacent kidney tissue shows increased renin, suggesting a role in renal disease progression.

Area of Science:

  • Nephrology
  • Renal Physiology
  • Molecular Biology

Background:

  • The renin-angiotensin system (RAS) plays a crucial role in regulating blood pressure and fluid balance.
  • Understanding how renal injury affects RAS component expression is vital for comprehending renal disease progression.

Purpose of the Study:

  • To investigate the impact of varying degrees of renal ablation on the expression of renin-angiotensin system components.
  • To examine the intrarenal distribution and localization of renin and its messenger RNA (mRNA) following partial nephrectomy.

Main Methods:

  • Male Sprague-Dawley rats underwent uninephrectomy, 1 1/3 nephrectomy, or sham operation.
  • Renin and angiotensinogen mRNA levels were quantified using RT-PCR at different time points post-surgery.
  • Tissue renin content, renin mRNA, and immunostainable renin were analyzed in scar-adjacent versus non-scar kidney tissues.

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Main Results:

  • Overall renin and angiotensinogen mRNA levels did not differ significantly between groups at 2 weeks post-surgery.
  • A decrease in renin mRNA was observed at 6 weeks after 1 1/3 nephrectomy compared to controls.
  • Tissue renin content, renin mRNA, and immunostainable renin were significantly elevated in the scar-adjacent kidney tissue compared to distant non-scar tissue.

Conclusions:

  • Partial nephrectomy leads to a localized increase in renin expression within the scar-adjacent renal tissue.
  • Immunoreactive renin was detected in juxtaglomerular apparatuses, vascular elements, and mesangial cells in the affected tissue.
  • This scar-associated redistribution of renin may contribute to the pathophysiology of progressive renal disease.