Abstract：
:Drugs that affect blood flow have been shown to be whole body radiation protectors. Using NG-nitro-L-arginine, a specific inhibitor of nitric oxide synthase, and the NO-releasing agent (C2H5)2N[N(O)NO-]Na+ (DEA/NO), we have studied the ability of NO to modulate whole body radiation toxicity in C3H mice. NG-Nitro-L-arginine given to mice between 15 and 60 min prior to radiation afforded significant protection from whole body irradiation, e.g., the estimated whole body irradiation dose required to kill 50% of mice by 30 days after radiation (LD50/30) in mice treated with NG-nitro-L-arginine 60 min before irradiation was 1051 cGy compared with a whole body radiation LD50/30 of 822 cGy in control mice (P < 0.00001). Treatment of mice with DEA/NO prior to whole body irradiation also significantly reduced toxicity; the estimated whole body radiation LD50/30 was 1063 and 945 cGy in mice treated with DEA/NO 10 or 30 min before irradiation, respectively (P < 0.00001 for radiation LD50/30 of either DEA/NO-treated group compared with control). Measurement of [14C]etanidazole binding to bone marrow demonstrated that DEA/NO and NG-nitro-L-arginine exacerbated bone marrow hypoxia. Perturbations of NO levels have profound effects on in vivo radiosensitivity of normal tissues. We hypothesize that alterations in regional blood flow may underlie the changes in radiosensitivity that we have observed.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Liebmann J,DeLuca AM,Coffin D,Keefer LK,Venzon D,Wink DA,Mitchell JBsubject
Has Abstractpub_date
1994-07-01 00:00:00pages
3365-8issue
13eissn
0008-5472issn
1538-7445journal_volume
54pub_type
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