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Related Experiment Videos

Catecholamines decrease nitric oxide production by cytokine-stimulated hepatocytes.

J L Collins1, Y Vodovotz, T Yoneyama

  • 1Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA.

Surgery
|August 8, 2001
PubMed
Summary
This summary is machine-generated.

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Catecholamines, like epinephrine and norepinephrine, reduce nitric oxide (NO) production in liver cells during inflammation. This effect is mediated by post-translational changes, not changes in iNOS gene expression.

Area of Science:

  • Hepatocyte biology
  • Inflammatory response
  • Sepsis pathophysiology

Background:

  • Catecholamines are elevated during inflammation and sepsis.
  • Nitric oxide (NO) is a key inflammatory mediator in sepsis, produced by inducible nitric oxide synthase (iNOS) in hepatocytes.
  • The role of catecholamines in regulating NO production by hepatocytes is not fully understood.

Purpose of the Study:

  • To investigate the hypothesis that catecholamines regulate nitric oxide (NO) production in hepatocytes.

Main Methods:

  • Primary rat hepatocytes were stimulated with cytomix and treated with catecholamines (epinephrine, norepinephrine).
  • iNOS mRNA and protein levels were analyzed using Northern blotting and Western immunoblotting.
  • Nitrite (NO(2)(-)) levels in cell culture supernatants were measured.

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Main Results:

  • Epinephrine and norepinephrine significantly reduced NO(2)(-) levels in stimulated hepatocytes.
  • Catecholamines did not affect iNOS mRNA or protein levels.
  • The reduction in NO(2)(-) was mimicked by forskolin and reversed by a protein kinase A inhibitor, suggesting a role for cyclic AMP.

Conclusions:

  • Catecholamines decrease NO production in cytokine-stimulated hepatocytes.
  • This effect appears to be post-translational and partly mediated by cyclic adenosine monophosphate (cAMP).