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Related Experiment Videos

Isolation and partial sequence of elasmobranch VIP.

R Dimaline, M C Thorndyke, J Young

    Regulatory Peptides
    |March 1, 1986
    PubMed
    Summary

    Researchers isolated a vasoactive intestinal peptide (VIP) from elasmobranchs, finding it similar to porcine VIP at the N-terminus but different at the C-terminus, affecting its function and metabolism.

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    Area of Science:

    • Comparative endocrinology
    • Peptide hormone research
    • Elasmobranch physiology

    Background:

    • Vasoactive intestinal peptide (VIP) is a crucial regulatory peptide found in various vertebrates.
    • Understanding VIP's evolution and structural variations across species provides insights into its biological roles.
    • Elasmobranchs, as ancient cartilaginous fishes, offer a unique perspective for comparative studies of conserved peptides.

    Purpose of the Study:

    • To isolate and characterize a VIP-related peptide from the gut of the elasmobranch Scyliorhinus canicula.
    • To compare the structure and biological activity of elasmobranch VIP with porcine VIP.
    • To investigate potential functional and metabolic differences arising from structural variations.

    Main Methods:

    • Peptide isolation and characterization using gel filtration, ion exchange chromatography, and reversed-phase HPLC.
    • N-terminal sequencing to determine amino acid identity.
    • Immunochemical analysis using antisera specific to porcine VIP.
    • Biological assays measuring exocrine pancreatic secretion in turkeys.

    Main Results:

    • A VIP-related peptide was successfully isolated and characterized from Scyliorhinus canicula.
    • The N-terminal decapeptide of elasmobranch VIP was identical to porcine VIP.
    • Elasmobranch VIP did not cross-react with antisera specific for the C-terminus of porcine VIP, indicating structural divergence.
    • Both porcine and elasmobranch VIP stimulated turkey pancreatic secretion, but the effect of elasmobranch VIP was shorter-lived.
    • Partially purified VIP from Squalus acanthius exhibited similar properties to Scyliorhinus VIP.

    Conclusions:

    • Elasmobranch VIP shares N-terminal identity with porcine VIP but differs significantly at the C-terminus.
    • These structural differences in elasmobranch VIP may lead to altered metabolic rates and functional durations.
    • The findings highlight evolutionary conservation and divergence of VIP structure and function across vertebrate classes.

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