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Angiotensinogen: an acute-phase protein?

M Soden1, C Klett, T Hasmann

  • 1Department of Pharmacology, University of Heidelberg, Germany.

Hypertension (Dallas, Tex. : 1979)
|January 1, 1994
PubMed
Summary

Angiotensinogen

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Area of Science:

  • Biochemistry
  • Immunology
  • Physiology

Background:

  • Angiotensinogen's role as an acute-phase protein is debated.
  • Previous studies suggested inflammation increases angiotensinogen synthesis.
  • Nephrectomy-induced stimulation was also considered an acute-phase response.

Purpose of the Study:

  • To evaluate whether angiotensinogen behaves as a typical acute-phase protein.
  • To investigate angiotensinogen secretion changes under various inflammatory stimuli.
  • To compare angiotensinogen's response with known acute-phase and negative acute-phase proteins.

Main Methods:

  • Isolated perfused rat liver model.
  • Systemic administration of lipopolysaccharide, turpentine, nephrectomy, and sham nephrectomy.
  • Analysis of angiotensinogen, alpha 1-acid glycoprotein, alpha 2-macroglobulin, and albumin secretion.
  • Hepatocyte culture experiments with interleukin-1 and interleukin-6.

Main Results:

  • Experimental surgeries variably affected angiotensinogen secretion.
  • Lipopolysaccharide and nephrectomy moderately increased angiotensinogen.
  • Turpentine decreased angiotensinogen, while sham surgery had no effect.
  • Interleukin-6 increased, but interleukin-1 decreased angiotensinogen secretion in hepatocytes.
  • Both cytokines elevated typical acute-phase proteins.

Conclusions:

  • Angiotensinogen exhibits non-uniform behavior inconsistent with a standard acute-phase protein.
  • Further research is needed to define angiotensinogen's specific function in inflammation.
  • Classifying angiotensinogen as an acute-phase protein is premature without this functional understanding.

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