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We histochemically investigated the radioprotection of organelle in acinus on the submandibular gland using amifostine. Mice were divided into those without amifostine administration or irradiation (group A), with amifostine administration and without irradiation (group B), without amifostine and with 5 Gy of irradiation (group C), and with amifostine and 5 Gy of irradiation (group D). In groups B and D were given 100 mg/kg of amifostine at 30 minutes prior to irradiation to the area equivalent to the submandibular gland. HE staining revealed that group D showed atrophy of the acinar cells, though the change was milder than that seen in group C. In AZAN-Mallory staining, fibrogenesis were found more often in group C as compared to the other groups. In Light Microscopic Autoradiography findings, the ratio of reduced silver particles in the acinar cells was lower in group C than in the other groups at 30 minutes after RI administration. Microstructure findings showed the findings were very similar to those of group A. In Electron microscopic Autoradiography, the ratio among the secretory granules was lower in group C at 120 minutes after RI administration. Our results indicate that amifostine can alleviate xerostomia caused by late effect from radiation.

Effects of Amifostine Administration Prior to Irradiation to the Submandibular Gland in Mice: Autoradiographic Study using 3H-leucine