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Rapid increases in peptide processing enzyme expression in hippocampal neurons
R V Bhat1, F A Tausk, J M Baraban
1Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
Journal of Neurochemistry
|October 1, 1993
Summary
Electroconvulsive treatment (ECT) rapidly increases peptide-processing enzymes, including peptidylglycine alpha-amidating monooxygenase (PAM), in the rat hippocampus. This study models the coordinate regulation of these enzymes following seizure activity.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Seizure activity elevates neuropeptide expression in the hippocampus.
- Posttranslational processing enzymes are crucial for bioactive peptide production.
Purpose of the Study:
- To investigate the effect of electroconvulsive treatment (ECT) on key peptide-processing enzymes in the rat hippocampus.
- To examine the expression of peptidylglycine alpha-amidating monooxygenase (PAM), prohormone convertase 1 (PC1), and prohormone convertase 2 (PC2) following ECT.
Main Methods:
- In situ hybridization to detect mRNA levels of PAM, PC1, and PC2.
- Northern blot analysis to confirm PAM mRNA changes.
- Immunohistochemistry to assess PAM protein levels.
Main Results:
- A single ECT rapidly increased PAM mRNA in dentate granule cells, peaking at 1-4 hours.
- Repeated ECT showed similar rapid PAM mRNA regulation.
- PAM protein increased in the dentate gyrus molecular layer 4-8 hours post-ECT.
- Single ECT also increased PC1 and PC2 mRNA levels in dentate granule cells, with PC2 showing a slower response.
Conclusions:
- Hippocampal dentate granule cells provide a model for studying rapid, coordinated regulation of peptide-processing enzymes.
- ECT induces swift changes in enzymes critical for bioactive peptide synthesis in the hippocampus.