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ELECTRON MICROSCOPIC STUDY OF THE SPILT IRRADIATION EFFECTS ON THE RAT PAROTID DUCTAL CELLS

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Abstract

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#ÃÊ·Ï#
This study was designed to investigate the effects of split irradiation on the salivary
ductal cells, especially on the intercalated cells of the rat parotid glands. For this study,
24 Sprague-Dawley strain rats were irradiated on the head and neck region with two
equal split doses of 9Gy for a 4 hours interval by Co-60 teletherapy unit, Picker's
model 4M 60. The conditions of irradiation were that field size, dose rate, SSD and
depth were 12¡¿5cm, 222cGy/min, 50§¯ 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 irrdiated intercalated cells of the parotid glands were examined under
light and electron microscope.
The results were as follows:
1. By the split irradiation, the degenerative changes of intercalated cells of the parotid
glands appeared at 3 hours after irradiation and the most severe cellular degeneration
observed at 6 hours after irradiation.
The repair processes began from 12 hours after irradiation and have matured
progressively.
2. Under electron microscope, loss of nuclear menbrane, microvilli and secretory
granules, derrangement of chromosomes, degenerartion of cytoplasm, atrophy or
reduction of intracytoplasmic organelles were observed in the intercalated ductal cells
after split irradiation.
3. Under light microscope, derrangement of ductal cells, widening of cytoplams and
nuclei, hyperchromatism and proliferation of ductal cells were observed in intercalated
ducts after split irradiation

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