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Temperature and pressure dependency of oxygen consumption during long-term sustained swimming of European eels.

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The rete mirabile: a possible control site for swimbladder function.

Bernd Pelster1,2

  • 1Institute for Zoology, Leopold-Franzens-Universität Innsbruck, Technikerstr. 25, 6020, Innsbruck, Austria. bernd.pelster@uibk.ac.at.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
|April 15, 2023
PubMed
Summary
This summary is machine-generated.

European eels possess a rete mirabile capable of regulating swimbladder function. This involves controlling blood flow and modifying countercurrent multiplication through identified receptor and signaling pathways.

Keywords:
Blood flow controlEuropean eelIntracellular signalingReceptorRete mirabileSwimbladder

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Area of Science:

  • Physiology
  • Molecular Biology
  • Fish Biology

Background:

  • The European eel's rete mirabile is known to express numerous transport proteins.
  • Previous studies identified a significant number of transport proteins in eel rete mirabile tissue.

Purpose of the Study:

  • To reanalyze existing data for receptor proteins and intracellular signaling pathways in the European eel's rete mirabile.
  • To investigate the molecular mechanisms underlying rete mirabile function, particularly in relation to blood flow and transport protein trafficking.

Main Methods:

  • Bioinformatic reanalysis of transcriptome and proteome data from saline-perfused rete mirabile tissue.
  • Identification and enrichment analysis of receptor proteins and proteins involved in intracellular signal transduction pathways.

Main Results:

  • A substantial number of expressed receptor proteins and intracellular signaling proteins were detected.
  • G-protein-coupled receptor signaling pathways, particularly those regulating blood flow, were significantly enriched.
  • Enriched pathways included those involved in trafficking key transport proteins such as monocarboxylate transporters, V-ATPase, and aquaporins.

Conclusions:

  • The rete mirabile in European eels has the molecular machinery to control swimbladder function.
  • This control is exerted through the regulation of blood flow and modification of countercurrent multiplication processes.
  • The identified signaling pathways are crucial for managing transport protein trafficking and overall rete mirabile function.