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Developmental expression of proenkephalin mRNA and peptides in rat striatum
L H Tecott1, J L Rubenstein, G Paxinos
1Stanford University Medical Center, Department of Psychiatry and Behavioral Neurosciences, Nancy Pritzker Laboratory, CA 94305.
Abstract:
The development of proenkephalin (PE) gene expression in the rat striatum was examined at the mRNA and peptide levels. Immunocytochemistry was performed with antisera generated to the PE-specific peptide product Met-enkephalin-Arg-Gly-Leu (MERGL). The distribution of immunostaining was compared with the distribution of PE mRNA, determined by in situ hybridization with an oligonucleotide probe. PE mRNA first appeared at E16 in the caudal ventrolateral striatum, followed at E17-18 by the appearance of MERGL immunoreactivity in a similar distribution. The anatomical gradients of PE gene expression were similar to the pattern of histogenesis of striatal neurons, suggesting that the timing of PE gene expression is related to the time of neuronal withdrawal from the mitotic cycle. The relation of the development of PE gene expression to the known patterns of striatal histogenesis, neurochemical compartmentalization and dopaminergic innervation is discussed.
Insights
Proenkephalin (PE) gene expression in rat striatum develops alongside neuronal maturation. This study maps PE mRNA and peptide (MERGL) distribution, linking expression timing to neuronal development.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Proenkephalin (PE) is a precursor to enkephalins, crucial neuropeptides in the brain.
- Understanding PE gene expression patterns is key to deciphering striatal development and function.
Purpose of the Study:
- To investigate the developmental timeline of proenkephalin (PE) gene expression in the rat striatum.
- To correlate PE gene expression with striatal neuronal development and histogenesis.
Main Methods:
- In situ hybridization to detect PE mRNA distribution.
- Immunocytochemistry using antisera against Met-enkephalin-Arg-Gly-Leu (MERGL) to identify peptide localization.
- Comparison of mRNA and peptide distributions with striatal histogenesis patterns.
Main Results:
- PE mRNA was first detected at embryonic day 16 (E16) in the caudal ventrolateral striatum.
- MERGL immunoreactivity appeared at E17-18, mirroring the PE mRNA distribution.
- The developmental gradients of PE gene expression align with striatal neuronal histogenesis.
Conclusions:
- PE gene expression timing in the striatum appears linked to neuronal differentiation and withdrawal from the cell cycle.
- Findings provide insights into the neurodevelopmental processes shaping striatal circuitry.