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ULTRASTRUCTURAL STUDY ON THE EFFECT OF RADIATION IN THE RAT FETUS TONGUE.

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Abstract

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The author observed the effects of 60Co irradiation on the development
and subcellular structure of tongue tissue of the fetal rats. The lower left abdomen of
mothers were exposed to radiation on 15¨öth day of gestation with 300R.
The fetuses were removed on the 6hr, 14hr, 24hr, 48hr and 72hr after irradiation and
the light microscopic and electron microscopic observations of the lingual epithelium,
lamina propria and muscle layer were carried out.
The results were as follows :
1. The irradiated fetuses showed the retardation of filiform papillae formation.
2. Epithelial cells revealed fusion and myelination of mitochondria, large autolysosomes,
increased lipid droplets, retardation of tonofilaments and desmosome formation.
3. In the lamina propria, undifferentiated cells showed blob formation of nuclear
membrane, pyknosis and fragmentation of nucleus, edema of cytoplasm and nucleus,
increased auto-lysosomes, dilatation of cell membrane and cell necrosis. Also,
collagenous fibril formation was inhibited by irradiation.
4. In the Muscle layer, growth of myotubes was inhibited. Myotubes showed swelling
of mito-chondila, loss of mitochondrial cristae, autolysosomes, retardation of myofibril
formation, and large vacuoles. Undifferentiated cells adjacent myotube contained pyknotic
nucleus and autolysosomes.
5. Among the various tissues of tongue, it seems that mesenchymal cells were most
radiosensitive.

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