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Modulation of p36 gene expression in human neuronal cells
S M de la Monte1, K Bhavani, Y Y Xu
1Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Charlestown 02129, USA.
Journal of the Neurological Sciences
|February 1, 1995
Summary
p36 protein levels increase in the adult brain after injury and are elevated in primitive neuroectodermal tumors (PNETs). Its expression in neurons is primarily regulated post-transcriptionally.
Area of Science:
- Neuroscience
- Cell Biology
- Oncology
Background:
- p36 is a calcium/lipid-binding phosphoprotein found in proliferating cells.
- It is expressed at low levels in differentiated cells like CNS neurons.
- p36's properties suggest a role in signal transduction.
Purpose of the Study:
- To investigate p36 gene expression in the mature central nervous system (CNS).
- To examine p36 expression in primary primitive neuroectodermal tumors (PNETs) and PNET cell lines.
- To understand the regulatory mechanisms of p36 expression in neuronal cells.
Main Methods:
- Western blot analysis to detect p36 protein levels.
- Immunohistochemistry to visualize p36 immunoreactivity.
- Analysis of p36 mRNA levels in relation to protein expression.
Main Results:
- p36 protein was detected at low levels in normal adult brain, but significantly increased after anoxic injury.
- Injured neurons showed elevated p36 immunoreactivity, likely due to post-transcriptional regulation.
- p36 was frequently detected in primary PNETs and PNET cell lines, with levels 5-fold higher than in adult brain.
- p36 expression in PNET cells was modulated by insulin, ethanol, and retinoic acid, independent of DNA synthesis.
Conclusions:
- p36 protein expression is upregulated in the adult CNS following injury.
- p36 is a potential marker for primitive neuroectodermal tumors.
- Post-transcriptional mechanisms play a significant role in regulating steady-state p36 protein levels in neuronal cells.