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Related Experiment Videos

Nitric oxide-endothelin-1 interaction in humans

G Ahlborg1, J M Lundberg

  • 1Department of Clinical Physiology, Huddinge University Hospital, Sweden.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 1, 1997
PubMed
Summary

Nitric oxide synthase blockade with NG-monomethyl-L-arginine (L-NMMA) in healthy men reduced cardiovascular function and suppressed glucose output. L-NMMA also increased endothelin-1 (ET-1) levels and blocked responses to ET-1 infusion.

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Area of Science:

  • Cardiovascular Physiology
  • Metabolic Regulation
  • Endocrinology

Background:

  • Nitric oxide (NO) plays a crucial role in regulating vascular tone and metabolic processes.
  • Endothelin-1 (ET-1) is a potent vasoconstrictor involved in cardiovascular homeostasis.
  • The interaction between NO and ET-1 in humans is not fully understood.

Purpose of the Study:

  • To investigate the cardiovascular and metabolic effects of blocking nitric oxide synthase (NOS) using NG-monomethyl-L-arginine (L-NMMA).
  • To determine if NOS blockade alters the human cardiovascular and metabolic response to endothelin-1 (ET-1) infusion.
  • To elucidate the interplay between NO and ET-1 in regulating vascular tone and splanchnic glucose output.

Main Methods:

  • Healthy male volunteers received intravenous L-NMMA infusion.
  • Cardiovascular parameters (heart rate, cardiac output, blood pressure, vascular resistance) were monitored.
  • Splanchnic glucose output (SGO) and arterial levels of ET-1, insulin, and glucagon were measured.
  • Subsequent ET-1 infusion was administered to assess responses after NOS blockade.

Main Results:

  • L-NMMA administration led to significant reductions in heart rate, cardiac output, and splanchnic/renal blood flow.
  • Mean arterial pressure, systemic, and pulmonary vascular resistance increased following L-NMMA.
  • Arterial ET-1 levels rose due to pulmonary net ET-1 release, and SGO decreased.
  • Subsequent ET-1 infusion elicited no significant cardiovascular or metabolic changes, indicating a blocked response.

Conclusions:

  • L-NMMA induces cardiovascular effects similar to ET-1 and suppresses SGO in humans.
  • L-NMMA stimulates pulmonary ET-1 release and inhibits the body's response to exogenous ET-1.
  • These findings suggest that nitric oxide normally inhibits ET-1 production, interacting with ET-1 to modulate vascular tone and SGO.

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