Summary
After seven days of feeding fructose the liver of Wistar rats showed enormous accumulations of glycogen, which completely altered the original pattern of distribution of organelles. A quantitative morphological method was used to analyze these changes.
The cytoplasm was mapped into arbitrary “distance classes” corresponding to concentric rings beginning at the outer nuclear membrane. This allowed the density of organelles in a given zone to be estimated.
In cells filled with glycogen as a result of the fructose feeding, the following rearrangements were found: in the intermediate zone of both cellular poles (i.e., bile canalicular pole and sinusoidal pole) the mitochondria disappeared, being replaced by glycogen.
The endoplasmic reticulum was accumulated in the perinuclear zone of both cellular poles, as in control animals, but was reduced throughout the rest of cytoplasm. It showed a peripheral density maximum at the biliary canalicular pole, in contrast to the cells of control animals.
These changes in the distribution of the organelles and cellular “compartments” correspond to histochemical findings and demonstrate an adaptive reaction in the liver parenchyma to fructose ingestion, the organelles arranging themselves in cytoplasmic regions which still show a metabolic activity.
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Supported by a grant from the Deutsche Forschungsgemeinschaft Az Ri 271/6-5
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Riede, U.N., Sasse, D. Quantitative topography of organelles in the liver. Cell Tissue Res. 221, 209–220 (1981). https://doi.org/10.1007/BF00216583
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DOI: https://doi.org/10.1007/BF00216583