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Somatostatin, cholecystokinin and neuropeptide Y mRNAs in normal and weaver mouse brain
K Zavitsanou1, L C Triarhou, E D Kouvelas
1Department of Physiology, Faculty of Medicine, University of Patras, Patras, Greece.
Abstract:
The distribution of mRNAs encoding for somatostatin, cholecystokinin and neuropeptide Y was determined by in situ hybridization histochemistry in the weaver (wv/wv) mouse, a model of dopamine deficiency as well as in normal (+/+) controls. Weaver mutants did not show any appreciable departure from the normal pattern of expression for mRNA encoding for neuropeptide Y. In contrast, an 82% increase in mRNA encoding for somatostatin was observed in the reticular thalamic nucleus, whereas increases in the order of 20-87% were observed in different hypothalamic nuclei of the weaver brain. In addition, a 47-103% increase of the hybridization signal encoding for cholecystokinin was observed in the cerebral cortex, hippocampus and thalamus of the weaver brain. It can be assumed that the elevated and region-specific somatostatin and cholecystokinin levels observed in the weaver brain may be due to a secondary or compensatory response under conditions of altered neurotransmitter levels.
Insights
The weaver mouse model shows altered brain neuropeptide levels. Somatostatin and cholecystokinin mRNA increased in specific brain regions, suggesting a compensatory response to dopamine deficiency.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- The weaver (wv/wv) mouse is a genetic model characterized by dopamine deficiency.
- Understanding neurotransmitter system alterations is crucial for neurological research.
Purpose of the Study:
- To investigate the distribution and levels of somatostatin, cholecystokinin, and neuropeptide Y mRNAs in the weaver mouse brain.
- To compare gene expression patterns between weaver mutants and normal controls.
Main Methods:
- In situ hybridization histochemistry was employed to quantify mRNA levels.
- The study focused on specific brain regions including the reticular thalamic nucleus, hypothalamus, cerebral cortex, and hippocampus.
Main Results:
- Neuropeptide Y mRNA expression remained unchanged in weaver mice compared to controls.
- Significant increases in somatostatin mRNA were observed in the reticular thalamic nucleus (82%) and hypothalamic nuclei (20-87%).
- Cholecystokinin mRNA showed marked increases (47-103%) in the cerebral cortex, hippocampus, and thalamus of weaver mice.
Conclusions:
- The weaver mouse brain exhibits region-specific elevations in somatostatin and cholecystokinin mRNA.
- These changes are likely a secondary or compensatory response to the underlying dopamine deficiency.
- Findings contribute to understanding neurochemical adaptations in dopamine-related neurological conditions.
