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Thyroid hormone signaling is highly heterogeneous during pre- and postnatal brain development
L Quignodon1, C Legrand, N Allioli
1Laboratoire de Biologie Moléculaire et Cellulaire de l'Ecole Normale Supérieure de Lyon, UMR CNRS 5665 LA INRA 913, IFR128 Lyon Gerland, 46 allée d'Italie, 69364 Lyon 07 France.
Journal of Molecular Endocrinology
|November 5, 2004
Summary
Thyroid hormone signaling in the developing mouse brain begins early in the midbrain and shows varied distribution. This heterogeneity may guide neural cell development.
Area of Science:
- Neuroscience
- Developmental Biology
- Endocrinology
Background:
- Thyroid hormones are crucial for brain development.
- The precise timing and location of thyroid hormone signaling during development are not fully understood.
Purpose of the Study:
- To investigate the spatio-temporal dynamics of thyroid hormone signaling in the developing mouse brain.
- To establish a reporter system for visualizing thyroid hormone activity.
Main Methods:
- Generation of transgenic reporter mice using a Gal4-thyroid hormone receptor fusion protein driving lacZ expression.
- Analysis of lacZ expression patterns to map thyroid hormone signaling activity.
Main Results:
- Thyroid hormone signaling initiates in the midbrain roof before the thyroid gland is functional.
- Signaling distribution is highly heterogeneous across the central nervous system during prenatal and postnatal development.
Conclusions:
- Thyroid hormone signaling is active in the brain earlier than previously thought.
- The observed heterogeneity in signaling may play a role in providing positional information to developing neural cells.