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Summary
Surgical lesions in the rat brain altered peptidase activity in the striatonigral system. Specific enzyme changes suggest distinct neuronal pathways and glial involvement in brain function.
Area of Science:
- Neuroscience
- Neurochemistry
Background:
- The striatonigral system is crucial for motor control and reward processing.
- Peptidases play vital roles in neurotransmission and neuropeptide metabolism within the brain.
Purpose of the Study:
- To investigate the impact of surgical lesions on peptidase activity in the rat striatonigral system.
- To elucidate the projection pathways of neurons expressing specific peptidases.
Main Methods:
- Induction of surgical lesions separating the caudate putamen from the globus pallidus in rat brains.
- Assay of various peptidase activities (e.g., angiotensin-converting enzyme, aminopeptidases, endopeptidases) in distinct brain regions (globus pallidus, substantia nigra, caudate putamen).
Main Results:
- Lesions decreased angiotensin-converting enzyme and alanyl aminopeptidase activity in the globus pallidus and substantia nigra.
- Prolyl endopeptidase and leucyl aminopeptidase activity decreased in the substantia nigra.
- Dipeptidyl aminopeptidase and arginyl endopeptidase activity increased in the caudate putamen and globus pallidus.
Conclusions:
- Striatal neurons expressing angiotensin-converting enzyme or alanyl aminopeptidase project to both the globus pallidus and substantia nigra.
- Neurons with prolyl endopeptidase and/or leucyl aminopeptidase project to the substantia nigra.
- Dipeptidyl aminopeptidase and arginyl endopeptidase activities are likely linked to glial cells in the striatonigral system.