Abstract
C57BL/6 mice were maintained for up to 18 months on high-fat and low-fat diets with or without a multi-mineral supplement derived from the skeletal remains of the red marine algae Lithothamnion calcareum. Numerous grossly observable liver masses were visible in animals on the “western-style” high-fat diet sacrificed at 12 and 18 months. The majority of the masses were in male mice (20 out of 100 males versus 3 out of 100 females; p = 0.0002). There were more liver masses in animals on the high-fat diet than on the low-fat diet (15 out of 50 on high-fat versus 5 out of 50 on low-fat; p = 0.0254). The multi-mineral supplement reduced the number of liver masses in mice on both diets (3 out of 25 male mice in the low-fat diet group without the supplement versus 1 out of 25 mice with supplement; 12 of 25 male mice in the high-fat diet group without the supplement versus 3 of 25 mice with supplement [p = 0.0129]). Histological evaluation revealed a total of 17 neoplastic lesions (9 adenomas and 8 hepatocellular carcinomas), and 18 pre-neoplastic lesions. Out of eight hepatocellular carcinomas, seven were found in unsupplemented diet groups. Steatosis was widely observed in livers with and without grossly observable masses, but the multi-mineral supplement had no effect on the incidence of steatosis or its severity. Taken together, these findings suggest that a multi-mineral-rich natural product can protect mice against neoplastic and pre-neoplastic proliferative liver lesions that may develop in the face of steatosis.
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Acknowledgements
This study was supported in part by grant CA140760 from the National Institutes of Health, Bethesda, MD, and by grant 11-0577 from the Association for International Cancer Research, St. Andrews, Fife, Scotland.
The authors would like to acknowledge Ron Craig (Histomorphometry Core) for his ScanScope services and Mark Deming of The Pathology Imaging Facility. The core laboratories are supported by the Department of Pathology at the University of Michigan. The authors would also like to thank Marigot, Ltd. (Cork, Ireland) for providing the multi-mineral supplement (Aquamin®) as a gift.
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Supplement Table 1
Composition of the mineral-rich extract (DOC 44 kb)
Supplement Table 2
Composition of the four diets (DOC 66 kb)
Supplement Table 3
Average weight by diet group at 18 months (DOC 27 kb)
Supplement Table 4
Serum and bone calcium levels (DOC 33 kb)
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Aslam, M.N., Bergin, I., Naik, M. et al. A Multi-Mineral Natural Product Inhibits Liver Tumor Formation in C57BL/6 Mice. Biol Trace Elem Res 147, 267–274 (2012). https://doi.org/10.1007/s12011-011-9316-2
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DOI: https://doi.org/10.1007/s12011-011-9316-2