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Related Experiment Videos

Eel ventricular natriuretic peptide: cDNA cloning and mRNA expression

Y Takei1, M Ueki, T Nishizawa

  • 1Laboratory of Physiology, University of Tokyo, Japan.

Journal of Molecular Endocrinology
|December 1, 1994
PubMed
Summary

A new cardiac hormone, ventricular natriuretic peptide (VNP), was identified in eels. VNP is synthesized and stored in the ventricle, distinguishing it from other natriuretic peptides.

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Area of Science:

  • Comparative endocrinology
  • Molecular biology
  • Cardiovascular research

Background:

  • Natriuretic peptides (NPs) are crucial regulators of cardiovascular homeostasis.
  • Cardiac NPs, including atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP), are well-characterized.
  • The existence and function of ventricular-specific NPs in non-mammalian vertebrates remain largely unexplored.

Purpose of the Study:

  • To characterize a novel cardiac natriuretic peptide, ventricular natriuretic peptide (VNP), from eel ventricles.
  • To determine the sequence and evolutionary relationship of VNP to other NPs.
  • To investigate the tissue-specific expression of VNP in eels.

Main Methods:

  • Cloning of eel VNP precursor cDNA from a ventricular cDNA library.

Related Experiment Videos

  • DNA and amino acid sequence analysis of the VNP precursor.
  • Comparative sequence analysis with mammalian ANP and BNP.
  • Tissue-specific mRNA expression analysis using Northern blot (implied).
  • Southern blot analysis to detect VNP in other species.

    • Main Results:

    • The eel VNP precursor consists of 150 amino acids, including a signal sequence and mature VNP(1-36).
    • VNP shares greater sequence identity with ANP than BNP at both cDNA and amino acid levels.
    • Eel VNP cDNA lacks the 3' ATTTA sequence characteristic of BNP cDNAs.
    • VNP mRNA is more abundant in eel ventricles than atria, unlike eel ANP mRNA.
    • VNP is also present in quail, a species known to have BNP.

    Conclusions:

    • VNP represents the first identified ventricular hormone based on synthesis and storage.
    • VNP exhibits distinct characteristics from BNP, suggesting a unique evolutionary path.
    • The presence of VNP in both eels and quails highlights its conserved role in vertebrates.
    • This discovery expands our understanding of natriuretic peptide diversity and function in cardiovascular regulation.