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AN ELECTRON MICROSCOPIC STUDY OF THE IRRADIATION EFFECTS ON THE RAT PAROTID INTERCALATED DUCT CELLS

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Abstract

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#ÃÊ·Ï#
This study was designed to investigate the effects of irradiation on the salivary ductal
cells, especially on the intercalated ductal cells of the rat parotid glands. For this study,
36 Sprague-Dawley strain rats were irradiated on the head and neck region with
absorbed dose of 15Gy by Co-60 teletherapy unit, Picker's model 4M60. The conditions
irradiated were that field size, SSD, dose rate and depth were 12¡¿5 §¯,50 §¯, 222
Gy/min. and 1 §¯. respectively.
The experimental animals were sacrificed 1,2,3,6,12 hours and 1,3,7 days after the
irradiation and the changes of the irradiated intercalated duct cells of the parotid glands
were examined under the light and electron microscope.
The results were as follows:
1. Under the light and electron microscope, the nucleus, mitochondria and secretory
granules showed severe changes in the early stage after irradiation and the most severe
cellular degenerations were observed 2 hours after irradiation, but the repair processes
began from 6 hours after irradiation.
2. Under the electron microscope, loss of the nuclear membranes, derrangement of the
chromosomes, swelling and destruction of the secretory granules, and widening of the
intercellular spaces were observed after irradiation.
3. Under the light microscope, atrophy and irregular proliferation of the ductal cells,
cuboidal metaplasia, hyperchromatism, and the construction or obstruction of the lumen
were observed after irradiation.

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