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Developmental changes in the regional Na+/glucose transporter mRNA along the small intestine of suckling rats

T Kojima1, M Nishimura, T Yajima

  • 1United Graduate School of Veterinary Science, Yamaguchi University, Japan. kojima@mx7.mesh.ne.jp

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
|May 18, 1999
PubMed

Insights

This study tracked the development of the sodium-glucose transporter (SGLT1) gene expression in young rats. Glucose absorption in the rat small intestine changes with age and location due to transporter activity.

Area of Science:

  • Physiology
  • Molecular Biology
  • Developmental Biology

Background:

  • The sodium-dependent glucose transporter 1 (SGLT1) plays a crucial role in intestinal glucose absorption.
  • Understanding its developmental regulation is key to comprehending nutrient assimilation in neonates.

Purpose of the Study:

  • To investigate the postnatal developmental changes in Na(+)-dependent glucose transporter (SGLT1) gene expression in rat pups.
  • To analyze the regional distribution and age-related variations of SGLT1 mRNA in the developing rat intestine.

Main Methods:

  • Northern blot analysis was employed to quantify SGLT1 mRNA levels.
  • Intestinal tissues from different regions (duodenum, jejunum, ileocecal junction, colon) of rat pups at various postnatal ages were analyzed.

Main Results:

  • A distinct regional gradient of SGLT1 mRNA was observed, with highest levels in the duodenum, decreasing towards the ileocecal junction.
  • SGLT1 mRNA levels in the jejunum showed a significant increase with advancing postnatal age.
  • SGLT1 mRNA was notably absent in the colon.

Conclusions:

  • Intestinal glucose uptake in developing rats is dynamically regulated by regional and age-dependent variations in SGLT1 transporter activity.
  • These findings highlight the developmental plasticity of glucose transport mechanisms in the neonatal rat small intestine.

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