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Biochemical and Molecular Actions of Nutrients

来自 EBSCO

阅读量：

138

作者：

H Martin，L Richert，A Berthelot

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摘要：

Momordica charantia or bitter melon is traditionally used as an antidiabetic agent in Asia, Africa, and South America. Recent studies indicate that bitter melon can also lower plasma lipids and VLDL in diabetic animal models as well as animals fed a high-fat diet, suggesting an effect on lipoprotein metabolism. The aim of this study was to delineate the cellular and molecular mechanisms involved in the lipid-lowering properties of bitter melon and regulation of apolipoprotein B (apoB). Human hepatoma cells, HepG2, treated with bitter melon juice (BMJ) for 24 h reduced apoB secretion with and without the addition of lipids (P < 0.05). However, BMJ did not increase apoB secretion in cells treated with N-acetyl-leucyl-leucyl-norleucinal, indicating a lack of effect on the proteasomal degradation pathway. BMJ reduced the secretion of new triglycerides (P < 0.05) and decreased microsomal triglyceride transfer protein (MTP) mRNA expression, suggesting that lipid bioavailability and lipidation of lipoprotein assembly are likely involved in decreased apoB secretion. Interestingly, BMJ increased the nuclear translocation of the mature form of sterol regulatory element-binding protein-1c (SREBP-1c, P < 0.05), involved in MTP secretion. Our data suggest that BMJ is a potent inhibitor of apoB secretion and TG synthesis and secretion that may be involved in the plasma lipid- and VLDL-lowering effects observed in animal studies.

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关键词：

grape polyphenols wine lipid peroxides macrophage

被引量：

69

年份：

2003

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来源期刊

Journal of Nutrition
2005/04/01

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2007
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