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Regulation of acetylcholinesterase expression during neuronal differentiation
1Department of Pharmacology, University of California, San Diego, La Jolla, California 92093-0636, USA.
The Journal of Biological Chemistry
|February 23, 1996
Summary
Acetylcholinesterase (AChE) expression in differentiating stem cells is regulated by mRNA stabilization, not transcription. This process involves a shift from secreted to membrane-bound AChE during neuronal development.
Area of Science:
- Neuroscience
- Developmental Biology
- Biochemistry
Background:
- P19 embryonic carcinoma cells serve as a model for studying neuronal differentiation.
- Acetylcholinesterase (AChE) is a key enzyme in cholinergic neurotransmission, but its developmental regulation is not fully understood.
Purpose of the Study:
- To investigate the developmental expression and regulation of acetylcholinesterase (AChE) during neuronal differentiation from pluripotent stem cells.
- To elucidate the molecular mechanisms controlling AChE production and localization during neuron development.
Main Methods:
- Induction of neuronal differentiation in P19 cells using retinoic acid.
- Analysis of AChE activity and mRNA levels.
- Characterization of the secreted and cell-surface bound forms of AChE.
Main Results:
- Undifferentiated P19 cells lack AChE activity and mRNA.
- Neuronal commitment leads to increased AChE mRNA, tetrameric enzyme production, and secretion.
- Neurite outgrowth correlates with reduced secretion and membrane tethering of AChE.
- AChE gene transcription remains constant, suggesting post-transcriptional regulation via mRNA stabilization.
Conclusions:
- Neuronal differentiation involves early mRNA stabilization of AChE, leading to enzyme secretion.
- Subsequent neurite outgrowth triggers a transition to cell membrane-bound AChE localization.
- Regulation of AChE expression during neuronal development is primarily post-transcriptional.
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