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Related Experiment Videos

Extrapancreatic glucagons.

J J Holst

    Digestion
    |January 1, 1978
    PubMed
    Summary

    Gastrointestinal tract mucosa contains glucagon-like peptides. While true glucagon exists in extrapancreatic tissues, its role and that of other gut-derived glucagon-like peptides remain unclear, necessitating further research.

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    Area of Science:

    • Endocrinology
    • Gastroenterology
    • Biochemistry

    Background:

    • The gastrointestinal (GI) tract mucosa produces peptides with glucagon-like properties.
    • These peptides react similarly to antibodies against pancreatic glucagon.
    • Previous research has advanced understanding but left many questions unanswered.

    Purpose of the Study:

    • To critically review the biochemistry and physiology of GI tract-derived glucagon-like peptides.
    • To establish the presence and characteristics of these peptides in various species.
    • To highlight the current understanding and future research directions.

    Main Methods:

    • Review of existing literature on extractive and analytical techniques.
    • Immunological characterization using antisera against pancreatic glucagon.
    • Biochemical analysis of peptide molecular weight and biological activity.

    Main Results:

    • A peptide indistinguishable from pancreatic glucagon (MW 3,485) is present in extrapancreatic GI tissues across species.
    • This peptide is abundant in canine gastric mucosa but less so in human and porcine tissues.
    • Human and porcine guts contain other glucagon-like peptides (gut-type glucagon, enteroglucagon, gut GLI), one with similar biological activity to true glucagon.

    Conclusions:

    • Findings in dogs may not be universally applicable due to species-specific variations in peptide abundance.
    • The precise physiological role of human and porcine gut-derived glucagon-like peptides is not yet established.
    • Recent isolation and purification of a specific gut peptide will aid future investigations.

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