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esub : AN ELECTION MICROSCOPIC STUDY THE IRRADIATION EFFECTS ON THE STRIATED DUCT CELLS OF THE SUBMANDIBULAR GLAND IN RATS
eauth : Gyu-Chan Lee, Sang Rae Lee
esosock : Department of Oral Radiology, College of Dentistry, Kyung Hee University
-Abstract-
The purpose of this study was to investigate the effects of irradiation on the striated
duct cells of the rat submandibular gland ductal tissues which control the characteristics
of saliva.
For this study, the experimental group was composed of 36 irradiated Sprague Dawley
strain rats divided into 8 subgroups- 1 hour, 2 hours, 3 hours, 6 hours, 12 hours, 24
hours, 48 hours, 72 hours after irradiation.
4 non-irradiated rats were used as the control group.
The experimental animals were singly irradiated with a dose of 18 Gy gamma ray to
their head and neck region by the Co-6- teletherapy unit and sacrificed after each
experimental duration.
The specimens were examined with a light microscope with an H-I stain and with a
trans-mission electron microscope.
The results of this study were as follows.
1. In the light micrograph, a severe atrophic change occurred in the striated duct cells
at 2 hours after irradiation and gradual recovery occurred from 6 hours after irradiation.
2. The nuclear chromosomes of the striated duct cells were changed granular at 2
hours after irradiation. Recovery was observed at 6 hours after irradiation. Nuclear
bodies were also observed from 3 hours after irradiation.
3. The mitochondria of the striated duct cells had indistinct cristae at 2 hours after
irradiation, and were degenerated or swollen at 3 hours after irradiation. They recovered,
however, from 6 hours, with an increasing number at 48 hours and a regular
arrangement was observed at 72 hours after irradiation.
4. The microvilli showed atrophic changes at 2 hours after irradiation and were almost
lost at 3 hours after irradiation. They were observed again from 48 hours after
irradiation.
5. The rough endoplasmic reticulum and golgi body were not apparent at 1 hour after
irradiation and were dilated with degeneration 2 hours after, but intact rough
endoplasmic reticulum were observed from 3 hours after Irradiation and developed well
at 24 hours after irradiation.
By the result of this study, showing a mild change in the functional morphology of
the salivary striated duct cells immediately following irradiation, it is considered that the
many complications which occur after radiation therapy, will disappear in time with the
histological and the functional recovery of the glandular tissues.

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