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The natriuretic peptide system in eels: a key endocrine system for euryhalinity?

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The Japanese eel uses atrial natriuretic peptide (ANP) for saltwater adaptation by controlling sodium levels, while C-type natriuretic peptide (CNP) aids freshwater adaptation. This natriuretic peptide system is key for eels adapting to different environments.

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Area of Science:

  • Endocrinology
  • Comparative Physiology
  • Osmoregulation

Background:

  • The Japanese eel (Anguilla japonica) possesses a complex natriuretic peptide system with multiple hormones and receptors.
  • While atrial natriuretic peptide (ANP) regulates volume and sodium/water excretion in mammals, its role in eels is primarily sodium extrusion.
  • Euryhaline fish face significant osmotic challenges when transitioning between freshwater and saltwater environments.

Purpose of the Study:

  • To elucidate the distinct roles of natriuretic peptides in the salinity adaptation of the Japanese eel.
  • To investigate the specific functions of ANP and C-type natriuretic peptide (CNP) in seawater and freshwater adaptation, respectively.
  • To understand the contribution of the natriuretic peptide system to the overall osmoregulatory capacity of euryhaline teleosts.

Main Methods:

  • Analysis of the natriuretic peptide system components, including hormones (ANP, VNP, CNP) and receptors (NPR-A, -B, -C, -D).
  • Observation of ANP secretion in response to hypernatremia and transfer to seawater.
  • Measurement of CNP and its receptor (NPR-B) gene expression in freshwater-acclimated eels.
  • Infusion studies of CNP in freshwater eels to assess its effect on sodium uptake.

Main Results:

  • ANP is secreted upon transfer to seawater, inhibiting sodium uptake and promoting seawater adaptation by reducing plasma sodium concentration.
  • ANP stimulates cortisol secretion, a long-term adaptation hormone, while ANP itself is rapidly cleared.
  • CNP and its receptor NPR-B expression are significantly upregulated in freshwater eels, and CNP infusion enhances sodium uptake in freshwater.

Conclusions:

  • ANP and CNP exhibit opposing roles in eel salinity adaptation, with ANP facilitating seawater adaptation and CNP promoting freshwater adaptation.
  • The differential effects are mediated by their specific receptors: ANP acting via NPR-A and CNP via NPR-B.
  • The natriuretic peptide system is crucial for enabling euryhaline fish to adapt to diverse osmotic conditions, particularly during initial environmental transitions.