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Distribution of alarin immunoreactivity in the mouse brain
Nicole Eberhard1, Christian Mayer, Radmila Santic
1Department of Pediatrics, Laura Bassi Centre of Expertise THERAPEP, Research Program for Receptor Biochemistry and Tumormetabolism, Paracelsus Medical University, Salzburg, 5020, Austria.
Journal of Molecular Neuroscience : MN
|June 8, 2011
Summary
Alarin, a peptide from the galanin family, is newly found in adult mouse brains. Its distribution suggests roles in reproduction and metabolism.
Area of Science:
- Neuroscience
- Endocrinology
- Molecular Biology
Background:
- Alarin is a peptide belonging to the galanin family, derived from the galanin-like peptide gene.
- It was initially identified in neuroblastic tumors and later found to possess vasoactive properties.
- Recent studies suggest alarin influences food intake and the hypothalamic-pituitary-gonadal axis in rodents.
Purpose of the Study:
- To identify the specific neurons expressing alarin in the adult murine brain.
- To map the distribution of alarin-like immunoreactivity (alarin-LI) throughout the central nervous system.
Main Methods:
- Immunohistochemistry was employed to detect alarin-LI in adult mouse brain sections.
- Antibody specificity was confirmed using pre-absorption with synthetic alarin and in GALP gene-deficient mice.
Main Results:
- Alarin-LI was detected in various brain regions, including the accessory olfactory bulb, medial preoptic area, amygdala, and hypothalamus.
- High concentrations of alarin-LI were observed in the arcuate nucleus, ventromedial hypothalamic nucleus, trigeminal complex, locus coeruleus, ventral cochlear nucleus, and facial nucleus.
- Alarin-LI was also found in the epithelial layer of the choroid plexus.
Conclusions:
- The distinct expression pattern of alarin in the adult mouse brain indicates potential neuromodulatory functions.
- These findings suggest that alarin may play significant roles in regulating reproduction and metabolism.
