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Distribution of the neuropeptide Y Y2 receptor mRNA in rat central nervous system
E L Gustafson1, K E Smith, M M Durkin
1Synaptic Pharmaceutical Corporation, Paramus, NJ 07652, USA.
Abstract:
Our group has recently reported the expression cloning of the human neuropeptide Y Y2 receptor DNA and subsequently the cloning of the rat homologue. These studies have made it possible to localize the mRNA encoding this NPY receptor subtype in rat tissues. We have, thus, carried out in situ hybridization studies, using radiolabeled oligonucleotide probes to the rat Y2 receptor mRNA, to determine the distribution of Y2 mRNA in rat brain and limited peripheral ganglia. Probe specificity was confirmed by testing antisense and sense probes in transfected cells. In rat brain, hybridization signals obtained with the antisense probes were discrete and were restricted to neuronal profiles in specific subregions of the cortex, hippocampus, amygdala, thalamus, hypothalamus, mesencephalon and pons. Among the regions exhibiting the most intense labeling were the CA3 region of the hippocampus, the arcuate nucleus of the hypothalamus and layer 3 of the piriform cortex. Other regions containing labeled neurons included the medial amygdala, the centromedial thalamic nucleus, the dorsal raphe, the dorsal motor nucleus of the vagus and the trigeminal ganglion. The present results indicate that the mRNA encoding the Y2 receptor is discretely localized in the rat brain and that the distribution is generally consistent with previous radioligand-binding studies. This study should help clarify the relationship between the Y2 receptor distribution and functional studies of NPY receptor subtype classification and provides further evidence for the involvement of the Y2 receptor in multiple physiological processes.
Insights
Researchers mapped the Y2 receptor mRNA distribution in rat brains using in situ hybridization. This neuropeptide Y receptor subtype is localized in specific brain regions, aiding functional studies.
Area of Science:
- Neuroscience
- Molecular Biology
- Receptor Research
Background:
- The neuropeptide Y (NPY) Y2 receptor is a key G protein-coupled receptor involved in various physiological processes.
- Previous studies have cloned human and rat Y2 receptor DNA, enabling investigation into its tissue distribution.
Purpose of the Study:
- To determine the precise distribution of Y2 receptor mRNA in the rat brain and peripheral ganglia.
- To correlate Y2 receptor mRNA localization with known functions and NPY receptor subtype classification.
Main Methods:
- Expression cloning of human and rat Y2 receptor DNA.
- In situ hybridization using radiolabeled antisense and sense oligonucleotide probes to detect Y2 receptor mRNA.
- Probe specificity confirmed via transfected cell assays.
Main Results:
- Y2 receptor mRNA was discretely localized in specific neuronal populations across various rat brain regions, including the cortex, hippocampus (CA3 region), amygdala, thalamus, hypothalamus (arcuate nucleus), mesencephalon, and pons.
- Intense labeling observed in the hippocampus CA3, hypothalamic arcuate nucleus, and piriform cortex layer 3.
- Labeled neurons also found in the medial amygdala, centromedial thalamic nucleus, dorsal raphe, dorsal motor nucleus of the vagus, and trigeminal ganglion.
Conclusions:
- The mRNA encoding the Y2 receptor exhibits a distinct localization pattern in the rat brain, consistent with radioligand-binding studies.
- This detailed mapping provides a foundation for understanding Y2 receptor function in diverse physiological processes.
- The findings support the Y2 receptor's involvement in multiple biological functions and aid in NPY receptor subtype classification.