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Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
09:17

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Published on: August 2, 2018

Hypoxia regulates the natriuretic peptide system.

Olli Arjamaa1, Mikko Nikinmaa

  • 1Center of Excellence in Evolutionary Genetics and Physiology, Department of Biology, University of Turku Finland.

International Journal of Physiology, Pathophysiology and Pharmacology
|September 24, 2011
PubMed
Summary

Natriuretic peptides, like BNP, are not just for cardiac disease diagnosis. New findings suggest oxygen gradients, not just wall stress, stimulate their release, impacting blood oxygen levels.

Keywords:
Hypoxiahemoconcentrationnatriuretic peptides

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Natriuretic peptides are crucial in cardiovascular homeostasis.
  • Current understanding links their release to cardiac wall stress from intravascular overload.
  • Limitations exist in using natriuretic peptides, like BNP, as simple diagnostic tools in cardiology due to confounding factors.

Purpose of the Study:

  • To re-evaluate the primary stimulus for natriuretic peptide synthesis and release.
  • To explore the role of oxygen gradients in regulating natriuretic peptides.
  • To understand the implications for cardiovascular diagnostics and physiology.

Main Methods:

  • Review of extensive published literature on natriuretic peptides, hypoxia, and physiological rhythms.
  • Analysis of gene promoter sequences for hypoxia-response elements in ANP and BNP.
  • Examination of physiological data from species with altered blood oxygen tension.

Main Results:

  • Hypoxia is a direct stimulus for Atrial Natriuretic Peptide (ANP) and Brain Natriuretic Peptide (BNP) synthesis and release.
  • Hypoxia-response elements are present in ANP and BNP gene promoters.
  • Physiological oxygen level changes regulate ANP plasma levels in species like seal pups.

Conclusions:

  • The oxygen gradient, present in all human tissues, is proposed as the primary stimulus for natriuretic peptide release.
  • Natriuretic peptides induce plasma volume contraction, leading to hemoconcentration and increased oxygen-carrying capacity.
  • This suggests a broader physiological role for natriuretic peptides beyond cardiac wall stress, impacting oxygen transport.