Distribution of prodynorphin mRNA and its interaction with the NPY system in the mouse brain
Shu Lin1, Dana Boey, Nicola Lee
1Neurobiology Program, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW 2010, Australia.
Abstract:
Using radioactive in situ hybridisation, the distribution of prodynorphin mRNA in the brains of C57Bl/6 mice was systemically investigated, and double-labelling in situ hybridisation was used to determine the extent to which neuropeptide Y (NPY) and prodynorphin mRNAs were co-expressed. Our results demonstrate that prodynorphin mRNA expression in the mouse brain is localised at specific subregions of the olfactory bulb, cortex, hippocampus, amygdala, basal ganglia, thalamus, hypothalamus, mesencephalon and myelencephalon. Among the regions displaying the most intense labelling were the olfactory tubercle, lateral septum (LS), caudate putamen (Cpu), central amygdaloid nucleus (Ce), paraventricular hypothalamic nucleus (PVN), supraoptic nucleus (SO), lateral hypothalamic area (LHA), ventromedial hypothalamic nucleus (VMH), lateral reticular nucleus (LRt) and solitary tract nucleus (NTS). In the arcuate nucleus of the hypothalamus (Arc), double-labelling in situ hybridisation revealed that prodynorphin expressing neurons also contained NPY mRNA, with a co-localisation rate of approximately 88% in the lateral part of the Arc, and 79% in the dorsal part of the Arc, respectively, suggesting potential overlapping functions of these two neurotransmitters in feeding type behaviour.
Insights
Prodynorphin mRNA is widely distributed in mouse brain regions, including the hypothalamus. In the arcuate nucleus, prodynorphin mRNA co-expresses with neuropeptide Y mRNA, suggesting shared roles in feeding behaviors.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Prodynorphin is a precursor to dynorphins, opioid peptides involved in various physiological processes.
- Neuropeptide Y (NPY) is a neurotransmitter implicated in appetite regulation and stress responses.
- Understanding the co-expression patterns of these neuropeptides can elucidate their functional relationships.
Purpose of the Study:
- To map the distribution of prodynorphin mRNA in the C57Bl/6 mouse brain.
- To investigate the co-expression of prodynorphin mRNA and neuropeptide Y (NPY) mRNA in specific brain regions.
Main Methods:
- Radioactive in situ hybridization was used to detect prodynorphin mRNA.
- Double-labeling in situ hybridization was employed to assess co-expression with NPY mRNA.
Main Results:
- Prodynorphin mRNA expression was observed in numerous brain subregions, including the olfactory bulb, cortex, hippocampus, amygdala, basal ganglia, thalamus, hypothalamus, mesencephalon, and myelencephalon.
- High levels of prodynorphin mRNA were found in the olfactory tubercle, lateral septum, caudate putamen, central amygdaloid nucleus, and several hypothalamic nuclei.
- In the arcuate nucleus, approximately 88% of prodynorphin-expressing neurons in the lateral part and 79% in the dorsal part also contained NPY mRNA.
Conclusions:
- Prodynorphin mRNA exhibits a broad distribution across the mouse brain.
- Significant co-expression of prodynorphin and NPY mRNAs in the arcuate nucleus suggests a potential shared role in regulating feeding behaviors.
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