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Published on: May 12, 2018
Urotensin-II expression in the mouse spinal cord
Johann-Günther Egginger1, Alain Camus, André Calas
1CNRS UMR 7101, Université Pierre et Marie Curie, Case Courrier 002, 7 quai Saint-Bernard, 75252 Cedex 05, Paris, France. johann.egginger@snv.jussieu.fr
Journal of Chemical Neuroanatomy
|December 20, 2005
Summary
Urotensin-II (UII), a peptide hormone, is expressed in mouse spinal cord motoneurons. This finding suggests UII may have roles beyond its endocrine function in fish, potentially within mammalian neuronal systems.
Area of Science:
- Neuroscience
- Molecular Biology
- Endocrinology
Background:
- Urotensin-II (UII) is a 12 amino acid peptide initially discovered in fish spinal cord neurosecretory cells.
- UII and its precursor mRNA have been identified in mammalian species, including rats, suggesting conserved roles.
Purpose of the Study:
- To investigate the distribution and expression of mouse UII and its precursor mRNA in the mouse spinal cord.
- To determine if UII is expressed in specific neuronal populations within the mammalian spinal cord.
Main Methods:
- In situ hybridization histochemistry to detect pro-UII mRNA.
- Immunohistochemistry to identify UII immunoreactivity.
- Double labeling and electron microscopy to characterize neuronal cell types.
Main Results:
- UII-like immunoreactive cell bodies were found in the ventral horn of the mouse spinal cord.
- These cells exhibited characteristics of motoneurons, co-expressing UII and vesicular acetylcholine transporter.
- Pro-UII mRNA was localized to neuronal perikarya in the ventral horn, confirming gene expression in motoneurons.
Conclusions:
- The gene for mouse UII is expressed in a subpopulation of spinal cord motoneurons.
- This study supports the hypothesis that UII, while endocrine in fish, is also expressed within mammalian motoneurons.
- UII may play a role in mammalian neuronal function beyond its known endocrine actions.
