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An experimental model for measuring intestinal permeability.

R Ecknauer, B Buck, D Breitig

    Digestion
    |January 1, 1983
    PubMed
    Summary
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    This study measured jejunal permeability in rats using four molecules. Permeability decreased with molecular weight, but was altered by EDTA and deoxycholate, impacting drug delivery research.

    Area of Science:

    • Gastroenterology
    • Pharmacokinetics
    • Physiology

    Background:

    • Jejunal permeability is crucial for nutrient absorption and drug delivery.
    • Understanding factors influencing jejunal permeability is essential for therapeutic development.

    Purpose of the Study:

    • To quantify jejunal permeability to different molecules in non-anesthetized rats.
    • To investigate the effects of specific agents (EDTA, deoxycholate, hydroxyurea) on jejunal permeability.

    Main Methods:

    • Simultaneous administration of mannitol, phenol red, inulin, and polyvinylpyrrolidone (PVP) in rats.
    • Analysis of blood, serum, urine, and duodenal fluid for compound recovery.
    • Assessment of jejunal permeability changes following administration of EDTA, deoxycholate, and hydroxyurea.

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    Main Results:

    • Jejunal permeation rate decreased with increasing molecular weight of the tested substances.
    • Approximately 50% of absorbed molecules were excreted in urine, 50% in extracellular space, and 1% in duodenal juice.
    • EDTA and deoxycholate enhanced permeability for most molecules, while hydroxyurea initially had no effect but later decreased permeability for larger molecules (inulin, PVP).

    Conclusions:

    • Jejunal permeability is inversely related to molecular size.
    • EDTA and deoxycholate can modulate jejunal permeability, suggesting potential therapeutic applications.
    • Hydroxyurea affects jejunal permeability to larger molecules over time, indicating an impact on mucosal integrity.