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AN ELECTRON MICROOSCOPIC STUDY ON THE EFFECTS OF IRRADIARION ON THE ACINAR CELLS OF RAT PAROTID GLAND

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Abstract

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#ÃÊ·Ï#
The author studied the histopathologic changes according to a single or a split dose
and the time after irradiation on the acinar cells of rat parotid gland. 99 Sprague
Dawley rats, weighing about 120gm, were divided into control and 3 experimental
groups.
In experimental groups, Group I and ¥± were delivered a single dose of 15Gy, 18Gy
and Group ¥² and ¥³ were delivered two equal split doses of 9Gy, 10.5Gy for a 4 hours
interval, respectively.
The experimental groups were delivered by a cobalt-60 teletherapy unit with a dose
rate of 222cGy/min, source-skin distance of 50§¯, depth of 1cm and a field size of 12¡¿5
§¯.
The animals were sacrificed at 1, 2, 3, 6, 12 hours, 1, 3, 7 days after irradiation and
examined by light and electron microscopy.
The results were as follows:
1. As the radiation dose increased and the acinar cells delivered a single dose
exposure were more damaged, and the change of acinar cells appeared faster than those
of a split dose exposure
2. The histopathologic change of acinar cells appeared at 1 hour after irradiation. The
recovery from damaged acinar cells appeared at 1 day after irradiation and there was a
tendency that the recovery from damage of a split dose exposure was somewhat later
than that of a single dose exposure.
3. Light microscope showed atrophic change of acinar cells and nucleus, degeneration
and vesicle formation of cytoplasm, widening of intercellular space and interlobular
space.
4. Electron microscope showed loss of nuclear membrane, degeneration of nucleus and
nucleoli, clumping of cytoplasm, widening and degeneration of rough endoplasinic
reticulum, loss of cristae of mitochondria, lysosome, autophagosome and lipid droplet,
5. Electron microscopically, the change of rough endoplasmic reticulum was the most
prominent and this appeared at 1 hour after irradiation as early changes of acinar cells.
The nuclear change appeared at 2 hours after irradiation and the loss of cristae of
mitochondria was observed at 2 hours after irradiation in all experimental groups.

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