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THE FINE STRUCTURE OF LIPOFUSCIN AGE PIGMENT IN THE NERVOUS SYSTEM OF AGED MICE
T Samorajski1, J M Ordy, J R Keefe
1Laboratory of Neurochemistry, Cleveland Psychiatric Institute, and Western Reserve University School of Medicine, Cleveland, Ohio.
The Journal of Cell Biology
|October 30, 2009
Summary
Lipofuscin pigment granules in aged mouse neurons present in dispersed or clustered configurations. Their size and distribution depend on granule quantity, with smaller granules being more numerous and dispersed.
Area of Science:
- Neuroscience
- Cell Biology
- Gerontology
Background:
- Lipofuscin pigment granules accumulate in neurons with age.
- Understanding lipofuscin's topographic distribution is crucial for aging research.
Purpose of the Study:
- To examine the topographic distribution of lipofuscin pigment granules in neurons.
- To compare pigment configurations in dorsal ganglia and ventral spinal cord neurons.
Main Methods:
- Light and electron microscopy were used.
- Qualitative comparisons of pigment bodies in motor and sensory neurons were performed.
Main Results:
- Two configurations of lipofuscin were observed: smaller, dispersed granules and larger, clustered granules.
- Granule size, complexity, and distribution varied with quantity; numerous granules were smaller and dispersed, while fewer granules were larger and clustered.
- Internal structure analysis revealed repeating patterns and potential phospholipid composition.
Conclusions:
- Lipofuscin pigment granule morphology and distribution in neurons are influenced by their quantity.
- The findings provide insights into the aging process at the cellular level in the nervous system.
