title: The radioprotective effect of misonidazole (Ro-07-0582) on normal canine rectum.
abstract: A single 1500 rad (=15 Gy) dose of 10-MeV X-rays was administered to the pelvis of 20 mongrel dogs. Ten received misonidazole (Ro-07-0582), 100 mg/kg p.o., 4 hours pre-irradiation. Serum misonidazole levels immediately pre-irradiation were 43 +/- 10 microgram/ml (mean +/- SD). The dogs were euthanized within 3 months post-irradiation. Each rectal specimen was studied for anatomic and histologic pathology and was assigned a Pathologic Alteration Score (PAS) of 1.2, or 3 in order of increasing severity. The PAS of the rectal specimens from the drug group was 1.6 +/- 0.7, and that of the controls 2.3 +/- 0.8. The PAS of the drug group was significantly lower than the control group (P = 0.008). The data suggest that misonidazole is a radioprotector for normal tissue.
mesh_terms: D000818:Animals; D004285:Dogs; D005260:Female; D008297:Male; D008920:Misonidazole / Q000097:blood / Q000494:pharmacology*; D009593:Nitroimidazoles / Q000494:pharmacology*; D011829:Radiation Dosage; D011837:Radiation-Protective Agents / Q000494:pharmacology*; D012007:Rectum / Q000528:radiation effects*; D013997:Time Factors
chemical_list: D009593:Nitroimidazoles; D011837:Radiation-Protective Agents; D008920:Misonidazole