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Influence of thyroid hormone on brain gene expression
J Bernal1, A Rodriguez-Pena, M A Iniguez
1Instituto de Investigaciones Biomedicas, CSIC, Madrid, Spain.
Acta Medica Austriaca
|January 1, 1992
Summary
Thyroid hormone is crucial for mammalian brain development, impacting oligodendrocyte gene timing and expression. It also influences the expression of the brain-specific RC3 gene in neonatal and adult animals.
Area of Science:
- Neuroscience
- Endocrinology
- Developmental Biology
Background:
- Thyroid hormone is essential for mammalian brain development.
- Thyroid hormone receptors (T3 receptors) and their mRNA isoforms are present early in rat fetal development.
- Receptor expression increases during critical neurodevelopmental periods like neuroblast proliferation and oligodendrocyte differentiation.
Purpose of the Study:
- To investigate the role of thyroid hormone in gene expression during neonatal rat brain development.
- To determine the impact of thyroid hormone deficiency on oligodendrocyte and neuronal gene expression.
- To elucidate the specific effects of thyroid hormone on myelin and RC3 gene expression timing and levels.
Main Methods:
- In situ hybridization to demonstrate mRNA distribution of thyroid hormone receptor isoforms (alpha and beta).
- Studying gene expression in hypothyroid rat models during the neonatal period.
- Analyzing the expression patterns of oligodendrocyte-specific genes and neuronal genes, including RC3.
Main Results:
- Lack of thyroid hormone significantly affects oligodendrocyte gene expression in a time- and region-dependent manner.
- Thyroid hormone primarily regulates the timing of expression for myelin-related genes.
- Thyroid hormone is necessary for the full expression of the neuronal gene RC3, but not for its timing, in both neonatal and adult rats.
Conclusions:
- Thyroid hormone plays a critical role in regulating gene expression during mammalian brain development, particularly for oligodendrocyte differentiation and myelination.
- The influence of thyroid hormone on gene expression is specific, affecting the timing of myelin genes and the overall level of neuronal genes like RC3.
- These findings highlight the complex and essential role of thyroid hormone in establishing normal brain structure and function throughout development and into adulthood.