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Updated: Aug 8, 2026
10:47
Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells (NPCs)
Published on: March 2, 2018
Glucocorticoid hormones decrease proliferation of embryonic neural stem cells through ubiquitin-mediated degradation
Maria Sundberg1, Suvi Savola, Anni Hienola
1Minerva Medical Research Institute, Biomedicum Helsinki, FIN-00290 Helsinki, Finland.
Summary
Glucocorticoids, like dexamethasone, inhibit embryonic neural stem cell proliferation by affecting the cell cycle. This highlights the critical role of glucocorticoid receptors in early brain development.
Area of Science:
- Neuroscience
- Developmental Biology
- Endocrinology
Background:
- Corticosteroids influence brain function via glucocorticoid receptors (GRs).
- GRs and mineralocorticoid receptors (MRs) are present in brain tissue.
- Embryonic neural stem cells (NSCs) are crucial for brain development.
Purpose of the Study:
- To investigate the expression of GR and MR in embryonic rat NSCs.
- To determine the effect of glucocorticoids on NSC proliferation and cell cycle.
- To elucidate the mechanism underlying glucocorticoid-induced inhibition of NSC proliferation.
Main Methods:
- Immunohistochemistry to detect GR expression in vivo.
- Culture of embryonic rat NSCs for in vitro experiments.
- 5'-bromo-2-deoxy-uridine (BrdU) labeling to assess cell proliferation.
- Western blotting to analyze cyclin D1 levels and ubiquitination.
- Treatment with receptor ligands (dexamethasone, corticosterone) and blockers (mifepristone, spironolactone).
Main Results:
- GR and MR were expressed in embryonic rat NSCs.
- Dexamethasone and corticosterone significantly reduced NSC proliferation in a dose-dependent manner.
- The GR blocker mifepristone inhibited the hormone effect, while the MR blocker spironolactone did not.
- Dexamethasone decreased cyclin D1 levels, an effect dependent on the ubiquitin proteasome system.
- Dexamethasone increased cyclin D1 ubiquitination, confirming the involvement of this pathway.
Conclusions:
- Embryonic neural stem cells express functional GRs and MRs.
- Glucocorticoids, acting via GRs, inhibit embryonic NSC proliferation and cell cycle progression.
- The ubiquitin proteasome system is involved in mediating the effects of glucocorticoids on cyclin D1.
- These findings demonstrate a critical influence of glucocorticoids on early brain development with potential long-term implications.
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