Related Experiment Video
Updated: Jul 29, 2026
08:33
An Ex vivo Culture System to Study Thyroid Development
Published on: June 6, 2014
[Thyroglobulin gene expression in cultured thyroid cells: regulation by thyrotropin]
Reproduction, Nutrition, Developpement
|January 1, 1981
Summary
Thyrotropin (TSH) significantly boosts thyroglobulin (Tgb) production in thyroid cells by increasing Tgb mRNA translation and cytoplasmic levels. TSH also enhances Tgb gene expression at the nuclear level, controlling Tgb biosynthesis.
Area of Science:
- Endocrinology
- Molecular Biology
- Cell Biology
Context:
- Thyrotropin (TSH) is a key regulator of thyroid function.
- Thyroglobulin (Tgb) is essential for thyroid hormone synthesis.
- Understanding TSH's influence on Tgb biosynthesis is crucial for thyroid research.
Purpose:
- To investigate the molecular mechanisms by which TSH influences thyroglobulin (Tgb) biosynthesis in porcine thyroid cells.
- To determine the specific levels at which TSH exerts its regulatory effects on Tgb production.
Summary:
- TSH treatment of porcine thyroid cells in culture resulted in a 10-fold increase in Tgb specific radioactivity.
- TSH enhances Tgb biosynthesis by increasing Tgb mRNA translation initiation, elevating cytoplasmic Tgb mRNA levels, and upregulating Tgb gene expression at the nuclear level (transcription or stabilization).
- TSH specifically regulates cytoplasmic Tgb mRNA content, leading to increased Tgb biosynthesis relative to total protein synthesis.
Impact:
- This study elucidates the multi-level regulatory role of TSH in controlling Tgb biosynthesis.
- Findings provide insights into the molecular basis of thyroid hormone production regulation.
- Highlights TSH's specific control over Tgb gene expression and protein synthesis.
Related Concept Videos
01:42What is Gene Expression?
Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
02:24Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
01:30General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
01:23Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...