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Accumulating autofluorescent material as a marker for early changes in the spinal cord of the Mnd mouse
1Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany 12201-0509.
Abstract:
The mouse mutant Motor neuron degeneration (Mnd) displays an adult-onset progressive degeneration of upper and lower motor neurons, with mild symptoms recognizable at 6 months, leading to spastic paralysis and premature death at 10-12 months on the C57B1/6 background. Despite this late onset, abnormally-accumulating autofluorescent material can be seen in both the spinal cord and other regions as early as the first month. This pigmented material is present in both increasing numbers of cells, and in increasing amounts within individual cells, as the animals age. Motor neurons then go on to degenerate, while most other cell types stabilize. The level of pathological involvement, well before the onset of clear clinical symptoms, suggests that the full degenerative process is an extremely gradual and protracted one with some selectivity for motor neurons.
Insights
Motor neuron degeneration (Mnd) mice show progressive motor neuron loss starting in adulthood. Early accumulation of autofluorescent material precedes clinical symptoms, indicating a gradual, motor neuron-selective disease process.
Area of Science:
- Neuroscience
- Genetics
- Pathology
Background:
- The Motor neuron degeneration (Mnd) mouse model exhibits progressive motor neuron degeneration.
- This degeneration has a late onset, with symptoms appearing around 6 months of age.
Purpose of the Study:
- To investigate the early pathological changes in Motor neuron degeneration (Mnd) mice.
- To understand the temporal relationship between early molecular events and motor neuron loss.
Main Methods:
- Longitudinal observation of Mnd mice on a C57B1/6 background.
- Histological and fluorescence microscopy analysis of spinal cord and other tissues.
- Age-dependent assessment of autofluorescent material accumulation.
Main Results:
- Abnormally accumulating autofluorescent material is detectable as early as one month of age in Mnd mice.
- The amount and cellular distribution of this material increase with age.
- Motor neurons show degeneration while most other cell types remain stable.
- Pathological changes precede the onset of clinical symptoms.
Conclusions:
- The Motor neuron degeneration (Mnd) phenotype involves a protracted and gradual degenerative process.
- Early accumulation of autofluorescent material is a key pathological hallmark preceding motor neuron death.
- The disease exhibits selectivity for motor neurons, despite early widespread cellular involvement.