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AN ELECTRON MICROSCOPIC STUDY ON THE EFFECTS OF IRRADIATION ON THE BUCCAL MUCOSA OF RAT

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Abstract

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¹æ»ç¼±Á¶»ç´Â Co-60½ÉºÎÄ¡·á±â¸¦ »ç¿ëÇÏ¿´À¸¸ç ¹é¼­µÎ°æºÎ¿¡ 15Gy, 16.5Gy, 18Gy¸¦ °¢°¢
´ÜȸÁ¶»çÇÏ¿´°í 9Gy, 9,75Gy, 10.5Cy¸¦ 4½Ã°£ °£°ÝÀ¸·Î 2ȸ Á¶»ç ÇÏ¿´´Ù.
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3. ¼¼Æ÷ÀÇ º¯È­´Â 18Gy¸¦ Á¶»çÇÑ ´ÜȸÁ¶»ç±º¿¡¼­ °¡Àå ½ÉÇÏ¿´°í 9Gy¸¦ 2ȸ Á¶»çÇÑ ºÐÇÒ
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#ÃÊ·Ï#
The author studied the acute reaction of cobalt-60 irradiation to buccal mucosa in rats
and difference of the effects of single versus fractionated exposure. 195 Sprague Dowley
strain rats, weighing about 120gm, were used in this experiment. 3 rats served as
controls and the remaining 192 rats were divided into six groups of 32 rats each.
Experimental group I, ¥±, ¥² were received a single dose of 15Gy, 16.5Gy, 18Gy and
group ¥³, ¥´, ¥µ were received two equal sized fractionated dose of 9Gy,9.75Gy,10.5Gy at
4 hour intervals, respectively.
The experimental groups were irradiated with cobalt-60 teletherapy unit, Picker model
4M 60 (Field size,12 5 §¯, SSD,50 §¯, Dose rate, 222cGy/min, Depth,1 §¯).
The animals were sacrificed at 1, 2, 3, 6, 12 hours, 1, 3, 7 days after irradiation and
the changes of the irradiated buccal mucosa were observed by electron and light
microscopy.
The results were as follows:
1. 4 single exposure was more damaging than fractionated exposure, and as the
radiation dose increased, the changes of cell organelles became faster, but the healing of
radiation-induced damage in fractionated exposure was faster than in single exposure.
2. The radiation-induced changes of the basal cells were the most prominent in
18Gy-single exposure group, and the least in 18Gy-fractionated exposure group.
3. Electron-microscopically, there appeared nuclear changes, swelling of mitochondria
and rough endoplasmic reticulum, decrease of free ribosome, presence of vesicles,
widening of intercellular space, and loss of basal lamina. The early remarkable changes
were partly loss of nuclear membrane and swelling of mitochondria.
4. Light-microscopically, derangement and pyknosis of basal cells, hydropic changes of
spinous cells, enlargement of granular cells, indistinctness of basement membrane, and
proliferation of epithelium were observed.

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