Abstract:
:Human epidemiological studies suggest that 1,25(OH)2 D3 deficiency might increase cancer incidence, but no spontaneous tumors have been reported in mice lacking 1,25(OH)2 D3 or deficient in its receptor. In our study, we detected, for the first time, diverse types of spontaneous tumors in l,25(OH)2 D3 deficient mice more than 1 year of age. This was associated with increased oxidative stress, cellular senescence and senescence-associated secretory phenotype molecules, such as hepatocyte growth factor, mediated via its receptor c-Met. Furthermore, 1,25(OH)2 D3 prevented spontaneous tumor development. We also demonstrated that l,25(OH)2 D3 deficiency accelerates allograft tumor initiation and growth by increasing oxidative stress and DNA damage, activating oncogenes, inactivating tumor suppressor genes, stimulating malignant cell proliferation and inhibiting their senescence; in contrast, supplementation with exogenous l,25(OH)2 D3 or antioxidant, or knock-down of the Bmi1 or c-Met oncogene, largely rescued the phenotypes of allograft tumors. Results from our study suggest that 1,25(OH)2 D3 deficiency enhances tumorigenesis by increasing malignant cell oxidative stress and DNA damage, stimulating microenvironmental cell senescence and a senescence-associated secretory phenotype, and activating oncogenes and inactivating tumor suppressor genes, thus increasing malignant cell proliferation. Our study provides direct evidence supporting the role of vitamin D deficiency in increasing cancer incidence. Conversely, 1,25(OH)2 D3 prevented spontaneous tumor development, suggesting that this inhibitory effect prevents the initiation and progression of tumorigenesis, thus provides a mechanistic basis for 1,25(OH)2 D3 to prevent tumorigenesis in an aging organism.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Chen L,Yang R,Qiao W,Yuan X,Wang S,Goltzman D,Miao Ddoi
10.1002/ijc.31317subject
Has Abstractpub_date
2018-07-15 00:00:00pages
368-382issue
2eissn
0020-7136issn
1097-0215journal_volume
143pub_type
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