Abstract:
:Children are especially sensitive to ionizing radiation and chemical carcinogens, and limiting their cancer risk is of great public concern. Calorie restriction (CR) is a potent intervention for suppressing cancer. However, CR is generally not appropriate for children. This study, therefore, examined to see if adult-onset CR influences the lifetime cancer risk in mice after early-life exposure to ionizing radiation. Infant male mice (1-week-old) were exposed to 3.8 Gy X-rays, fed a control 95 kcal/week or CR 65 kcal/week diet from 7 weeks of age (adult stage), and their lifespan and tumor development were assessed. Irrespective of CR, X-rays shortened lifespan by 38%, and irrespective of irradiation CR extended lifespan by 20%. Thymic lymphoma (TL) and early-occurring non-TL were induced by radiation. The liver and Harderian gland were more susceptible to radiation-induced tumors than the lungs and non-thymic lymphoid tissues (late occurring). CR reduced the risk of hepatocellular carcinoma, late-occurring non-TL, lung tumor, Harderian tumor, and hemangioma but had less impact on TL and early-occurring non-TL. Most notably, the effects of X-rays on induction of lung tumors, late-occurring non-TL and hemangioma were essentially canceled by CR. The ability of CR to prevent late-occurring tumors was the same for non-irradiated and irradiated mice, indicating that the mechanism by which CR influences cancer is independent of irradiation. Our results indicate that adult-onset CR significantly inhibits late-occurring tumors in a tissue-dependent manner regardless of infant radiation exposure.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Shang Y,Kakinuma S,Yamauchi K,Morioka T,Kokubo T,Tani S,Takabatake T,Kataoka Y,Shimada Ydoi
10.1002/ijc.28751subject
Has Abstractpub_date
2014-09-01 00:00:00pages
1038-47issue
5eissn
0020-7136issn
1097-0215journal_volume
135pub_type
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