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Endothelin-1 induces a strong pressor effect in ball pythons (Python regius).

Maja Fuhlendorff Jensen1, Signe Nedergaard1, Hang Nguyen Nielsen2

  • 1Zoophysiology, Department of Bioscience, Aarhus University, 8000 Aarhus, Denmark; Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark.

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|November 27, 2019
PubMed
Summary
This summary is machine-generated.

Endothelin-1 (ET-1) causes vasoconstriction in pythons, increasing systemic blood pressure. This study reveals ET-1

Keywords:
Blood pressureET(A) receptorET(B) receptorMyographyReptile

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Area of Science:

  • Comparative physiology
  • Cardiovascular research
  • Reptile biology

Background:

  • Endothelin-1 (ET-1) is a potent vasoactive peptide regulating blood pressure in mammals via ETA and ETB receptors.
  • ET-1's cardiovascular effects and receptor mechanisms in reptiles are less understood.
  • Mammalian ET-1 signaling differs, with ETA causing vasoconstriction and ETB having dual roles.

Purpose of the Study:

  • To investigate the cardiovascular effects of Endothelin-1 (ET-1) in pythons.
  • To determine the presence and function of ET-1 receptors in python vasculature.
  • To compare ET-1 signaling in pythons with that in other vertebrates.

Main Methods:

  • Immunoblotting to detect ETA and ETB receptors in python vasculature.
  • Myography on isolated mesenteric and pulmonary arteries to assess ET-1's vasoactive effects.
  • Systemic blood pressure measurements in recovered pythons following ET-1 administration.

Main Results:

  • ETA and ETB receptors were confirmed in the vasculature of pythons.
  • ET-1 induced a dose-dependent vasoconstriction in both mesenteric and pulmonary arteries.
  • In vivo studies showed an ET-1-induced increase in systemic blood pressure.

Conclusions:

  • Endothelin-1 (ET-1) exerts a significant pressor effect on the systemic circulation of pythons.
  • The findings suggest a conserved role for ET-1 in regulating blood pressure across different vertebrate classes.
  • This study highlights distinct ET-1 cardiovascular actions in reptiles compared to some mammalian responses.