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Modulation of proenkephalin A gene expression by cyclic AMP
R Folkesson1, H J Monstein, T Geijer
1Department of Pharmacology, Uppsala University, Sweden.
Brain Research. Molecular Brain Research
|May 1, 1989
Summary
Norepinephrine (NE) and dibutyryl-3
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Proenkephalin A is a precursor to opioid peptides like met-enkephalin.
- Understanding its regulation is crucial for neurobiology and pain research.
Purpose of the Study:
- To investigate the regulation of proenkephalin A expression in human neuroblastoma cells.
- To examine the effects of norepinephrine, dexamethasone, and cyclic AMP on gene expression, processing, and secretion.
Main Methods:
- Human neuroblastoma SK-N-MC cells were treated with various agents (NE, DEX, dbcAMP).
- Proenkephalin A mRNA levels were quantified using molecular biology techniques.
- Intracellular and secreted immunoreactivity were measured.
Main Results:
- Norepinephrine (NE) and dibutyryl-3',5'-cyclic AMP (dbcAMP) transiently increased proenkephalin A mRNA levels.
- NE's effect involved beta-adrenoceptors and was antagonized by dexamethasone (DEX).
- DEX did not affect mRNA levels but inhibited NE-induced secretion.
Conclusions:
- Gene expression, prohormone processing, and secretion of enkephalins are coordinated by a cAMP-dependent mechanism.
- Beta-adrenoceptor signaling and glucocorticoids play distinct roles in regulating proenkephalin A expression.