Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
HYUNJUNG BANG Last modified date:2021.07.12

Assistant Professor / Attached Promotive Center for International Education and Research of Agriculture / Faculty of Agriculture

1. Masao Sato, Hiroyoshi Sato, Akiko Ogawa, Run Nomura, Shinichiro Takashima, Hyunjung Bang, Hiromi Matsuoka, Katsumi Imaizumi, Antiatherogenic effect of isoflavones in ovariectomized apolipoprotein E-deficient mice, Journal of Agricultural and Food Chemistry, 10.1021/jf071771q, 55, 22, 8967-8971, 2007.10, The consumption of isoflavone-containing foods such as soybean and soybean products has been reported to have beneficial effects on the cardiovascular system in postmenopausal women. The present study was carried out to examine the mechanism underlying the beneficial effects of isoflavones in apolipoprotein (apo) E-deficient mice subjected to ovarian resection. Compared with sham-operated mice, ovariectomized mice had a larger arterial lesion area in the aortic root. Feeding the ovariectomized mice an isoflavone-containing diet (0.055 mg/kJ of total isoflavones/cal of diet) reduced the size of these lesions more than did feeding them with an isoflavone-free diet. Neither ovariectomy nor diet had a significant effect on the concentration of cholesterol in serum and urinary levels of isoprostanes, which are biomarkers for oxidative stress in vivo. The ovariectomized mice showed a greater increase in mRNA abundance for monocyte chemoattractant protein (MCP)-I in the aorta and in the level of nitric oxide (NO) secreted by peritoneal macrophages in culture than did the sham-operated mice. The isoflavone-containing diet lowered the MCP-I expression and the NO secretion more than did the isoflavone-free diet. These results suggest that dietary isoflavones confer an antiatherogenic effect by preventing the activation of macrophages due to the removal of ovaries..
2. Hyun Jung Bang, Chiyo Arakawa, Michihiro Takada, Masao Sato, Katsumi Imaizumi, A comparison of the potential unfavorable effects of oxycholesterol and oxyphytosterol in mice
Different effects, on cerebral 24S-hydroxychoelsterol and serum triacylglycerols levels, Bioscience, Biotechnology and Biochemistry, 10.1271/bbb.80256, 72, 12, 3128-3133, 2008.12, Sterol oxidation products derived from cholesterol and phytosterol are formed during the processing and storage of foods. The objective of the present study was to assess the potential unfavorable effects of oxysterols in mice. C57BL/6J mice were fed an AIN-93G-based diet containing 0.2 g/kg of oxycholesterol or oxyphytosterol for 4 weeks. The most abundant oxysterol in the diet was 7-ketosterol, but α-epoxycholesterol, β-epoxycholesterol, or 7α-hydroxyphytosterol, and 7β-hydroxyphytosterol were more prominent than 7-ketosterol in the serum and liver respectively. Consumption of both oxysterols resulted in an increased in 4β-hydroxycholesterol and total oxycholesterol in the liver, but the oxycholesterol-fed mice had a lower level of cerebral 24S-hydroxycholesterol and a higher level of the serum triacylglycerols than the control and oxyphytosterol groups. These results indicate that both oxysterols in the diet are accumulated in the body, but that the biological effect of oxycholesterol is different from that of oxyphytosterol..