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Mixed Primary Cultures of Murine Small Intestine Intended for the Study of Gut Hormone Secretion and Live Cell Imaging of Enteroendocrine Cells
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Ontogeny of glucagon-like immunoreactive peptides in rat intestine

P L Brubaker

    Regulatory Peptides
    |June 1, 1987
    PubMed

    Insights

    The fetal rat intestine develops glucagon-like peptides (GLP) between 17 and 19 days of gestation. This study tracked GLP levels, finding significant increases and maturation during this critical developmental window.

    Area of Science:

    • Developmental Biology
    • Endocrinology
    • Gastroenterology

    Background:

    • Intestinal glucagon-like peptides (GLP) play crucial roles in metabolic regulation.
    • Understanding the ontogeny of these peptides is essential for comprehending fetal development and potential metabolic programming.

    Purpose of the Study:

    • To investigate the developmental timeline of intestinal glucagon-like peptides (GLP) in fetal rats.
    • To characterize the molecular forms of GLP present during gestation and early postnatal life.

    Main Methods:

    • Rats were studied from 16 days of gestation to 4 days postnatally.
    • Intestinal peptide content was quantified using radioimmunoassay.
    • Gel filtration chromatography was employed to determine the molecular weights of GLP peptides.

    Main Results:

    • Intestinal glucagon-like immunoreactive (GLI) peptide content significantly increased from 0.09 pmol/nmol protein at 16-17 days gestation to 2.8 pmol/nmol protein by 20 days gestation.
    • Two main GLI peptides (11-12 kDa and 5-6 kDa) were detected in fetal rat intestines from 18 days gestation onwards.
    • No significant developmental trends in immunoreactive glucagon (IRGa) were observed, and IRGa peaks were not detected at any age.

    Conclusions:

    • The fetal rat intestine exhibits significant maturational development between 17 and 19 days of gestation, leading to the production of GLP peptides.
    • These findings highlight a critical window for GLP development in the fetal gut.
    • The study provides insights into the ontogeny of gut peptides and their potential roles in early development.

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