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Dendritic alterations in cortical pyramidal cells in the sparse fur mouse
K J Hopkins1, J McKean, R F Mervis
1Department of Environmental Toxicology, University of California, Riverside, CA 92521, USA.
Brain Research
|June 19, 1998
Summary
Ornithine carbamoyltransferase deficiency causes toxic hyperammonemia in sparse fur mice. This neurological condition significantly reduces dendritic complexity and spine density in brain cells, potentially explaining behavioral issues.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- Ornithine carbamoyltransferase deficiency is an X-linked metabolic disorder.
- It results in toxic hyperammonemia, a condition of elevated ammonia levels in the blood.
- Sparse fur (spf/Y) mice are a model organism exhibiting this deficiency.
Purpose of the Study:
- To investigate the neuroanatomical consequences of ornithine carbamoyltransferase deficiency in spf/Y mice.
- To quantitatively analyze the dendritic structure of layer V pyramidal neurons in the frontoparietal cortex.
Main Methods:
- Utilized the Golgi Kopsch staining method for detailed visualization of neuronal morphology.
- Performed quantitative analysis of the basilar dendritic tree complexity.
- Assessed dendritic terminal spine density in affected mice and controls.
Main Results:
- Sparse fur (spf/Y) mice showed a significant reduction in dendritic arbor complexity compared to control mice.
- A marked decrease (60%) in dendritic terminal spine density was observed in spf/Y mice.
- These structural changes were localized to layer V pyramidal cells in the frontoparietal cortex.
Conclusions:
- Ornithine carbamoyltransferase deficiency leads to significant structural alterations in neuronal dendritic trees.
- Reduced dendritic complexity and spine density may underlie the observed behavioral dysfunctions in spf/Y mice.
- These findings highlight the impact of hyperammonemia on neuronal development and function.