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Region-specific consequences of PCD gene expression in the olfactory system
1Laboratory of Molecular Neurobiology, Cornell University Medical College, White Plains, New York 10605.
The Journal of Comparative Neurology
|March 1, 1990
Summary
The Purkinje cell degeneration (PCD) gene does not affect dopamine neuron activity in the olfactory bulb despite mitral cell loss. However, PCD mice show structural changes in the olfactory system, indicating broader gene effects.
Area of Science:
- Neuroscience
- Neurobiology
- Olfactory System Research
Background:
- Juxtaglomerular dopamine neurons in the olfactory bulb receive input from mitral cells.
- Peripheral denervation in mice reduces tyrosine hydroxylase (TH) activity in these neurons.
- Purkinje cell degeneration (PCD) is a genetic mutation affecting neuronal development.
Purpose of the Study:
- Investigate the impact of mitral cell loss on olfactory bulb dopamine neurons in PCD mice.
- Determine if the PCD gene influences TH expression in these neurons.
- Examine other structural alterations in the olfactory system of PCD mice.
Main Methods:
- Comparative analysis of TH activity and immunoreactivity in olfactory bulbs of PCD mice and littermates.
- Assessment of TH activity in the substantia nigra.
- Histological examination for structural abnormalities, including the anterior commissure.
Main Results:
- Mitral cell degeneration in PCD mice did not alter TH activity or immunoreactivity in juxtaglomerular dopamine neurons.
- TH activity in the substantia nigra remained unchanged.
- Homozygous PCD mice exhibited absence of the anterior commissure, suggesting broader olfactory system effects.
Conclusions:
- The dopamine phenotype in olfactory bulb juxtaglomerular neurons is resistant to PCD-related mitral cell loss.
- The PCD gene has wider effects on olfactory system structure than previously recognized.
- Despite structural changes, the PCD mutation shows neuronal specificity regarding TH expression.