首页> 外文期刊>Life sciences >Dietary phytosterols modulate T-helper immune response but do not induce apparent anti-inflammatory effects in a mouse model of acute, aseptic inflammation.
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Dietary phytosterols modulate T-helper immune response but do not induce apparent anti-inflammatory effects in a mouse model of acute, aseptic inflammation.

机译:饮食中的植物甾醇可调节T辅助免疫反应,但在急性,无菌炎症小鼠模型中不会诱导明显的抗炎作用。

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Although most studies have focused on the cholesterol-lowering activity of phytosterols, other biological actions have been ascribed to these plant sterol compounds, one of which is a potential immune modulatory effect. To gain insight into this issue, we used a mouse model of acute, aseptic inflammation induced by a single subcutaneous turpentine injection. Hypercholesterolemic apolipoprotein E-deficient (apoE(-/-)) mice, fed with or without a 2% phytosterol supplement, were treated with turpentine or saline and euthanized 48 h later. No differences were observed in spleen lymphocyte subsets between phytosterol- and control-fed apoE(-/-) mice. However, cultured spleen lymphocytes of apoE(-/-) mice fed with phytosterols and treated with turpentine showed increased IL-2 and IFN-gamma secretion (T-helper type1, Th1 lymphocyte cytokines) compared with turpentine-treated, control-fed animals. In contrast, there was no change in Th2 cytokines IL-4 and IL-10. Phytosterols also inhibit intestinal cholesterol absorption in wild-type C57BL/6J mice but, in this case, without decreasing plasma cholesterol. Spleen lymphocytes of turpentine-treated C57BL/6J mice fed with phytosterols also showed increased IL-2 production, but IFN-gamma, IL-4 and IL-10 production was unchanged. The Th1/Th2 ratio was significantly increased both in phytosterol-fed apoE(-/-) and C57BL/6J mice. We conclude that phytosterols modulate the T-helper immune response in vivo, in part independently of their hypocholesterolemic effect in a setting of acute, aseptic inflammation. Further study of phytosterol effects on immune-based diseases characterized by an exacerbated Th2 response is thus of interest.
机译:尽管大多数研究都集中在降低植物甾醇的胆固醇活性上,但这些植物甾醇化合物还具有其他生物学作用,其中之一是潜在的免疫调节作用。为了深入了解此问题,我们使用了由单次皮下松节油注射引起的急性无菌性炎症小鼠模型。饲喂或不饲喂2%植物甾醇的高胆固醇血症性载脂蛋白E缺乏症(apoE(-/-))小鼠用松节油或生理盐水处理,并在48小时后安乐死。在植物固醇和对照喂养的apoE(-/-)小鼠之间的脾淋巴细胞亚群中未观察到差异。但是,与用松节油治疗,对照喂养的动物相比,喂食植物甾醇并用松节油治疗的apoE(-/-)小鼠的脾脏淋巴细胞显示出IL-2和IFN-γ分泌增加(T辅助1型,Th1淋巴细胞细胞因子)。 。相反,Th2细胞因子IL-4和IL-10没有变化。植物甾醇还抑制野生型C57BL / 6J小鼠的肠道胆固醇吸收,但在这种情况下,不会降低血浆胆固醇。饲喂植物甾醇的松节油治疗的C57BL / 6J小鼠的脾淋巴细胞也显示IL-2产生增加,但IFN-γ,IL-4和IL-10产生未改变。在植物固醇喂养的apoE(-/-)和C57BL / 6J小鼠中,Th1 / Th2比率均显着增加。我们得出的结论是,植物甾醇在体内会调节T辅助免疫反应,部分独立于其在急性,无菌炎症中的降胆固醇作用。因此,对植物甾醇对以Th2反应加剧为特征的免疫性疾病的作用进行进一步研究是很有意义的。

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