Related Experiment Videos
Ultrastructural identification of light microscopic giant mitochondria in alcoholic liver disease
T Inagaki1, S Kobayashi, N Ozeki
1First Department of Internal Medicine, Aichi Medical University, Japan.
Abstract:
Ultrastructural identification of light microscopic giant mitochondria was performed on the same specimens for light and electron microscopic observations. The liver tissue specimens were fixed in OsO4, embedded in epoxy resin, cut 4 microns thick and stained with polychrome. At the beginning of the study a light microscopic observation was made, and a microphotograph was taken. The identification of light microscopic giant mitochondria by conventional microscopy was identified by the occupation rate in liver cells, the negative findings of stainability and the morphological consistency (round, cigar-shaped and granular). The specimens were subsequently embedded again in epoxy resin and cut into ultrathin sections of 400 A. A transillumination electron microscope was used for the observation, and ultrastructural images of light microscopic giant mitochondria revealed that they were crystalloid bodies with a crystalline latticelike structure. The occupation rates within liver cells and the morphological shapes of the crystalloid bodies corresponded with those of light microscopic giant mitochondria. The light microscopic giant mitochondria obviously had different features from those of electron microscopic giant mitochondria and Mallory bodies (Yokoo's type II), although Mallory bodies showed the same staining properties as light microscopic giant mitochondria.
Insights
Light microscopic giant mitochondria, identified by morphology and location in liver cells, were ultrastructurally revealed as crystalloid bodies. This study differentiates them from electron microscopic giant mitochondria and Mallory bodies.
Area of Science:
- Hepatopathology
- Cell Biology
- Microscopy
Background:
- Giant mitochondria can be observed using light microscopy, but their ultrastructural nature requires further investigation.
- Distinguishing between different types of mitochondrial abnormalities and cellular inclusions is crucial for accurate diagnosis.
Purpose of the Study:
- To ultrastructurally identify light microscopic giant mitochondria.
- To compare the ultrastructure of light microscopic giant mitochondria with electron microscopic giant mitochondria and Mallory bodies.
Main Methods:
- Liver tissue specimens were processed for both light and electron microscopy.
- Light microscopy was used for initial observation and identification of giant mitochondria based on morphology and staining.
- Ultrathin sections were examined using a transillumination electron microscope for ultrastructural analysis.
Main Results:
- Light microscopic giant mitochondria were identified as crystalloid bodies with a crystalline latticelike structure at the ultrastructural level.
- The size, shape, and cellular occupation rate of these crystalloid bodies corresponded to the light microscopic observations.
- Distinct ultrastructural differences were noted between light microscopic giant mitochondria, electron microscopic giant mitochondria, and Mallory bodies.
Conclusions:
- Light microscopic giant mitochondria represent a distinct ultrastructural entity, characterized by a crystalline latticelike structure.
- Ultrastructural examination is essential for differentiating various forms of mitochondrial abnormalities and cellular inclusions in liver pathology.