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PTEN-mediated Akt activation in human neocortex during prenatal development.
Gamze Tanriover1, Necdet Demir, Elif Pestereli
1Department of Histology and Embryology, Akdeniz University, Antalya, 07070, Turkey.
Histochemistry and Cell Biology
|May 13, 2005
Summary
Phosphatase and tensin (PTEN) expression decreases while active Akt levels increase during human neocortex development. This suggests PTEN regulates Akt signaling, impacting brain development and modeling.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Signaling
Background:
- Akt signaling is vital for cell survival and migration.
- PTEN negatively regulates cell growth by inhibiting PI3K-dependent signaling and Akt phosphorylation.
- Limited data exists on PTEN expression and Akt phosphorylation in the developing human neocortex.
Purpose of the Study:
- To investigate the expression patterns of PTEN and phospho-Akt in the developing human neocortex.
- To understand the role of PTEN in modulating human brain cortical development through Akt activation.
Main Methods:
- Immunohistochemistry and Western blot were used to analyze PTEN and phospho-Akt levels.
- Semiquantitative analysis was performed on samples from 13 fetuses across three trimesters.
- Double immunohistochemistry identified cell types associated with Akt activity.
Main Results:
- PTEN expression decreased with fetal development, while active Akt levels increased.
- Strong nuclear PTEN immunoreactivity was observed in some developing neocortical cells.
- Proliferating cell nuclear antigen (PCNA)-positive cells, primarily glial (GFAP), correlated with active Akt.
Conclusions:
- Akt-mediated signaling is crucial for cell migration, survival, and cerebral cortical modeling during prenatal development.
- PTEN is likely a key regulator of Akt signaling in the developing human brain.