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Journal of Environmental Pathology, Toxicology and Oncology
IF: 1.15 5-Year IF: 1.4 SJR: 0.519 SNIP: 0.613 CiteScore™: 1.61

ISSN Print: 0731-8898
ISSN Online: 2162-6537

Journal of Environmental Pathology, Toxicology and Oncology

DOI: 10.1615/JEnvironPatholToxicolOncol.2013006370
pages 9-20

Antimutagenic Activity and In Vitro Anticancer Effects of Bamboo Salt on HepG2 Human Hepatoma Cells

Xin Zhao
Department of Food Science and Nutrition, Pusan National University, Busan 609-735, South Korea; Department of Biological and Chemical Engineering, Chongqing University of Education, Chongqing 400067, People's Republic of China
Jaehyun Ju
Department of Food Science and Nutrition, Pusan National University, Busan, Korea
Hyung-Min Kim
Department of Pharmacology, College of Oriental Medicine, Institute of Oriental Medicine, Kyung Hee University, Seoul 130-701, South Korea
Kun-Young Park
Department of Food Science and Biotechnology, College of Life Sciences, Cha University, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Republic of Korea

ABSTRACT

Bamboo salt is a traditional Korean baked solar salt processed by packing the solar salt in bamboo joint cases and heating it several times to high temperatures. The antimutagenic activity and in vitro anticancer effects of bamboo salt on HepG2 human hepatoma cells were investigated and compared to those of other salt samples. Although solar salt and purified salt exhibited comutagenicity with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) in the Salmonella typhimurium TA100 strain, bamboo salt was associated with a lower degree of comutagenicity or antimutagenic activity. Bamboo salt baked nine times (9×) showed a greater increase in antimutagenic activity than salts baked once (1×) or three times (3×). At a concentration of 1%, the growth rate of HepG2 cells treated with 9× bamboo salt determined by a 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyltetrazolium bromide (MIT) assay was reduced by 65%; this rate of inhibition was higher than that achieved with 1× baked bamboo salt (40%). Purified and solar salts had relatively lower inhibitory effects on growth rate (25% and 29%, respectively). Compared to the other salt samples, 9× bamboo salt significantly (p<0.05) induced apoptosis as determined by 4,6-diamidino-2-phenylindole (DAPI) staining and flow cytometry analysis. It also upregulated the expression of Bax, caspase-9 and caspase-3; and downregulated Bcl-2 expression. The bamboo salts, especially 9× bamboo salt, also significantly (p<0.05) downregulated the expression of inflammation-related NF-κB, iNOS, and COX-2, and upregulated the gene expression of IκB-α compared to the other salt sample.


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