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Related Experiment Videos

Urotensin II and renal function in the rat.

W Song1, A E S Abdel-Razik, W Lu

  • 1Faculty of Life Sciences, University of Manchester, Manchester, UK.

Kidney International
|March 15, 2006
PubMed
Summary

Urotensin II (UII) regulates kidney function in rats, impacting glomerular filtration rate and sodium excretion. Increased UII and its receptor (UT) in spontaneously hypertensive rats suggest a role in cardiovascular disease.

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Area of Science:

  • Nephrology
  • Endocrinology
  • Cardiovascular Physiology

Background:

  • Urotensin II (UII) is a vasoactive hormone with known effects on fish kidney function, but its role in mammalian kidneys is largely unknown.
  • Understanding UII's renal actions is crucial for elucidating its physiological and pathophysiological roles in mammals.

Purpose of the Study:

  • To investigate the effects of Urotensin II (UII) on renal function in rats.
  • To determine the localization and expression of UII and its receptor (UT) in the rat kidney.

Main Methods:

  • Standard clearance methods were used to assess renal function following UII or urantide administration.
  • Radioimmunoassay measured UII levels in plasma and urine.
  • Immunohistochemistry and mRNA quantification localized UII and UT expression in kidney tissues.

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Main Results:

  • Rat urine UII levels were significantly higher than plasma levels.
  • UII and UT were localized to specific kidney structures, including proximal tubules and collecting ducts.
  • UII injection reduced GFR, urine flow, and sodium excretion, while urantide increased these parameters.
  • UII and UT expression were elevated in spontaneously hypertensive rats (SHRs) with higher plasma UII.

Conclusions:

  • Endogenous UII contributes to the regulation of GFR and renal sodium/water handling in rats.
  • Hemodynamic effects likely mediate UII's renal actions, but direct tubular effects cannot be excluded.
  • Elevated UII and UT in SHRs suggest UII's involvement in cardiovascular disease pathophysiology.