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Related Experiment Videos

Taurocholate transport by brush-border membrane vesicles from the developing rabbit ileum: structure/function

S M Schwarz1, J B Watkins, S C Ling

  • 1Department of Pediatrics, New York Medical College, Valhalla 10595.

Journal of Pediatric Gastroenterology and Nutrition
|May 1, 1990
PubMed
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Bile acid transport in rabbit ileum matures during weaning, showing increased Na(+)-dependent taurocholate uptake linked to membrane fluidity changes. This active transport system develops as the rabbit

Area of Science:

  • Gastroenterology
  • Cell Biology
  • Biochemistry

Background:

  • Bile acid transport is crucial for nutrient absorption and homeostasis.
  • Ontogenesis of intestinal transport systems is vital for understanding physiological development.
  • The rabbit ileum's role in bile acid reabsorption is well-established.

Purpose of the Study:

  • To investigate the developmental timeline of bile acid transport in the rabbit ileum.
  • To characterize the maturation of taurocholate uptake during postnatal development.
  • To explore the relationship between membrane properties and bile acid transport maturation.

Main Methods:

  • Preparation of purified brush-border membrane vesicles from rabbits of different ages (14-49 days).
  • Measurement of taurocholate uptake using radiolabeled compounds and varying incubation times.

Related Experiment Videos

  • Analysis of transport mechanisms (Na(+)-dependent, carrier-mediated) and membrane properties (fluidity, lipid dynamics).

    • Main Results:

    • Secondary active, Na(+)-dependent taurocholate transport emerged at weaning (21 days).
    • Taurocholate uptake increased significantly between 21 and 35 days, plateauing at maturity.
    • Uptake correlated with age-related decreases in ileal brush-border membrane fluidity and lipid dynamics.

    Conclusions:

    • Bile acid secondary active transport maturation in the rabbit ileum is linked to developmental changes in brush-border membrane lipid dynamics.
    • Membrane fluidity plays a role in regulating the efficiency of taurocholate transport.
    • These findings provide insights into the ontogenesis of intestinal transport systems.