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Oleuropein, the bitter principle of olives, enhances nitric oxide production by mouse macrophages.

机译:橄榄苦苷,橄榄苦苷,可增加小鼠巨噬细胞产生一氧化氮的能力。

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摘要

The Mediterranean diet, rich in fresh fruits and vegetables, has been associated with a lower incidence of cardiovascular disease and cancer, partly because of its high proportion of bioactive compounds such as vitamins, flavonoids and polyphenols. The major lipid component of such diet is the drupe-derived olive oil, that can be distinguished from other seed oils for the peculiar composition of its non-triglyceride fraction. In fact, several minor components, including polyphenols, grant the oil its particular taste and aroma. Oleuropein, the most abundant among these components, has been shown to be a potent antioxidant endowed with antiinflammatory properties. We investigated the effects of oleuropein on NO release in cell culture and its activity toward nitric oxide synthase (iNOS) expression. The results show that oleuropein dose-dependently enhance nitrite production in LPS-challenged mouse macrophages. This effect was blocked by the iNOS inhibitor L-NAME, indicating increased iNOS activity. Also, Western blot analysis of cell homogenates show that oleuropein increases iNOS expression in such cells. Taken together, our data suggest that, during endotoxin challenge, oleuropein potentiates the macrophage-mediated response, resulting in higher NO production, currently believed to be beneficial for cellular and organismal protection.
机译:地中海饮食中富含新鲜水果和蔬菜,其心血管疾病和癌症的发生率较低,部分原因是其生物活性化合物(例如维生素,类黄酮和多酚)的比例很高。这种饮食的主要脂质成分是源自核果的橄榄油,由于其非甘油三酸酯馏分的特殊组成,可以与其他种子油区分开。实际上,包括多酚在内的几种次要成分赋予油以其特殊的味道和香气。在这些成分中含量最丰富的橄榄苦苷已被证明是一种具有抗炎特性的有效抗氧化剂。我们调查了橄榄苦苷对细胞培养物中NO释放的影响及其对一氧化氮合酶(iNOS)表达的活性。结果表明,橄榄苦苷剂量依赖性地增强了LPS攻击的小鼠巨噬细胞中亚硝酸盐的产生。该作用被iNOS抑制剂L-NAME阻断,表明iNOS活性增加。同样,对细胞匀浆的蛋白质印迹分析表明,橄榄苦苷增加了此类细胞中iNOS的表达。两者合计,我们的数据表明,在内毒素攻击期间,橄榄苦苷增强了巨噬细胞介导的反应,导致产生更高的NO,目前认为对细胞和机体的保护是有益的。

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