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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Urolithins Display both Antioxidant and Pro-oxidant Activities Depending on Assay System and Conditions
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Urolithins Display both Antioxidant and Pro-oxidant Activities Depending on Assay System and Conditions

机译:尿石素同时显示抗氧化剂和促氧化剂活性,具体取决于测定系统和条件

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摘要

The biological effects of polyphenols ellagitannins are mediated by their intestinal metabolites, urolithins. This study investigated redox properties of urolithins A and B using ORAC assay, three cell-based assays, copper-initiated pro-oxidant activity (CIPA) assay, and cyclic voltammetry. Urolithins were strong antioxidants in the ORAC assay, but mostly pro-oxidants in cell-based assays, although urolithin A was an antioxidant in cell culture medium. Parent compound ellagic acid was a strong extracellular antioxidant, but showed no response in the intracellular assay. The CIPA assay confirmed the pro-oxidant activity of ellagitannin metabolites. In the cell proliferation assay, urolithins but not ellagic acid decreased growth and metabolism of HepG2 liver cells. In cyclic voltammetry, the oxidation of urolithin A was partly reversible, but that of urolithin B was irreversible. These results illustrate how strongly measured redox properties depend on the employed assay system and conditions and emphasize the importance of studying pro-oxidant and antioxidant activities in parallel.
机译:多酚鞣花单宁的生物作用由其肠道代谢产物尿石素介导。这项研究使用ORAC分析,三种基于细胞的分析,铜引发的抗氧化剂活性(CIPA)分析和循环伏安法研究了尿石素A和B的氧化还原特性。尿石素是OR​​AC测定中的强抗氧化剂,但在基于细胞的测定中主要是前氧化剂,尽管尿石素A是细胞培养基中的抗氧化剂。母体化合物鞣花酸是一种强大的细胞外抗氧化剂,但在细胞内分析中未显示任何反应。 CIPA分析证实了鞣花单宁代谢产物的促氧化活性。在细胞增殖试验中,尿石素而不是鞣花酸降低了HepG2肝细胞的生长和代谢。在循环伏安法中,尿石素A的氧化部分可逆,但尿石素B的氧化不可逆。这些结果说明了强烈测量的氧化还原特性取决于所采用的测定系统和条件,并强调了同时研究促氧化剂和抗氧化剂活性的重要性。

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