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Related Experiment Videos

Endothelin: an important factor in acute renal failure?

J D Firth1, P J Ratcliffe, A E Raine

  • 1Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Oxford.

Lancet (London, England)
|November 19, 1988
PubMed
Summary

Endothelin, a potent vasoconstrictor, causes significant renal vasoconstriction and reduces glomerular filtration rate (GFR) at very low concentrations. This peptide may play a key role in acute renal failure.

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Area of Science:

  • Nephrology
  • Cardiovascular Physiology
  • Endocrinology

Background:

  • Endothelin is a potent vasoconstrictor peptide.
  • Its role in renal function and potential involvement in acute renal failure are not fully understood.

Purpose of the Study:

  • To investigate the effects of endothelin on renal hemodynamics and glomerular filtration rate (GFR) in an isolated perfused rat kidney model.
  • To compare the potency of endothelin with angiotensin II as a renal vasoconstrictor.

Main Methods:

  • Utilized an isolated perfused rat kidney model.
  • Administered varying concentrations of endothelin and angiotensin II.
  • Measured renal blood flow and GFR.

Main Results:

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  • Endothelin caused intense, long-lasting renal vasoconstriction at very low concentrations (200 pmol/l for 50% blood flow reduction).
  • Endothelin was significantly more potent than angiotensin II (1000 pmol/l for 50% blood flow reduction).
  • A dose-dependent reduction in GFR was observed with endothelin, decreasing GFR by 90% from 100 to 800 pmol/l, whereas angiotensin II had minimal effect on GFR.

Conclusions:

  • Endothelin is a highly potent renal vasoconstrictor, exceeding the potency of angiotensin II.
  • Endothelin significantly reduces GFR.
  • Elevated circulating endothelin levels, potentially occurring during acute renal failure, suggest it may be a key mediator in the pathogenesis of this condition.