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An Ex vivo Culture System to Study Thyroid Development
08:33

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

The critical period for thyroid hormone responsiveness through thyroid hormone receptor isoform alpha in the

Kazuki Mochizuki1, Eriko Yagi, Naomi Sakaguchi

  • 1Graduate School of Nutritional and Environmental Sciences, COE Program in the 21st Century, The University of Shizuoka, Shizuoka 422-8526, Japan.

Biochimica Et Biophysica Acta
|February 13, 2007
PubMed

Insights

Thyroid hormone receptor alpha (TRalpha) expression in rat jejunum changes during development. This shift correlates with the critical period for thyroid hormone regulation of hexose transporters, impacting nutrient absorption.

Area of Science:

  • Developmental biology
  • Endocrinology
  • Gastroenterology

Background:

  • Serum thyroid hormone levels are elevated in rats during the second and third weeks post-birth.
  • Thyroid hormone receptors play a crucial role in regulating gene expression and development.

Purpose of the Study:

  • To investigate the expression of thyroid hormone receptor (TR) alpha in the developing rat jejunum.
  • To understand the relationship between TRalpha expression and hexose transporter development.

Main Methods:

  • Quantification of TRalpha-1 and TRalpha-2 mRNA levels in rat jejunum at various developmental stages.
  • Analysis of hexose transporter mRNA levels following thyroid hormone (T3) administration.
  • Assessment of the TRalpha-1/TRalpha-2 mRNA ratio during postnatal development.

Main Results:

  • TRalpha-1 mRNA and the TRalpha-1/TRalpha-2 mRNA ratio increased significantly from 5 to 13 days post-birth, remaining elevated until day 20.
  • TRalpha-2 mRNA levels remained constant throughout the study period.
  • Increased TRalpha-1/TRalpha-2 ratio correlated with enhanced hexose transporter mRNA levels, particularly after T3 administration during specific developmental windows.

Conclusions:

  • A transient change in the TRalpha-1/TRalpha-2 mRNA ratio in the developing rat jejunum is linked to thyroid hormone sensitivity.
  • This dynamic receptor expression is critical for the thyroid hormone-mediated regulation of hexose transporters during a key period of intestinal development.

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