Related Experiment Videos
An alpha-subunit-secreting cell line derived from a mouse thyrotrope tumor
I E Akerblom1, E C Ridgway, P L Mellon
1Regulatory Biology Laboratory, Salk Institute, La Jolla, California 92037.
Molecular Endocrinology (Baltimore, Md.)
|April 1, 1990
Summary
Researchers developed a stable cell line to study thyroid-stimulating hormone (TSH) alpha-subunit gene expression. This model reveals how cAMP, phorbol esters, and glucocorticoids regulate TSH alpha-subunit mRNA levels.
Area of Science:
- Endocrinology
- Molecular Biology
- Cell Biology
Background:
- The anterior pituitary gland has diverse endocrine cells secreting specific hormones.
- Studying individual hormone regulation requires pure cell populations, free from other cell types and hormones.
Purpose of the Study:
- To establish a clonal, continuous cell line from the MGH101A thyrotrope tumor for studying thyroid-stimulating hormone (TSH) alpha-subunit regulation.
- To investigate the effects of second messengers and glucocorticoids on TSH alpha-subunit mRNA expression in an isolated system.
Main Methods:
- Development of a clonal continuous cell line from the MGH101A thyrotrope tumor.
- Analysis of alpha-subunit mRNA and protein expression and secretion.
- Treatment of the cell line with cAMP, phorbol esters, and glucocorticoids to assess gene expression changes.
Main Results:
- The MGH101A-derived cell line stably expresses alpha-subunit mRNA and secretes alpha-subunit protein.
- Phorbol esters significantly increased alpha-subunit mRNA levels (3.5-fold).
- cAMP increased alpha-subunit mRNA levels (1.8-fold), while glucocorticoids decreased them (2-fold) from basal or cAMP-induced levels.
Conclusions:
- The established cell line provides a valuable tool for studying TSH alpha-subunit gene expression in a renewable, clonal system.
- This model system allows for the investigation of regulatory mechanisms affecting TSH alpha-subunit production independently of other pituitary hormones.