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Eosinophils synthesize trihydroxyoctadecenoic acids (TriHOMEs) via a 15-lipoxygenase dependent process.
Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids ( IF 4.8 ) Pub Date : 2020-01-06 , DOI: 10.1016/j.bbalip.2020.158611
David Fuchs 1 , Xiao Tang 1 , Anna-Karin Johnsson 2 , Sven-Erik Dahlén 2 , Mats Hamberg 1 , Craig E Wheelock 1
Affiliation  

Trihydroxyoctadecenoic acids (TriHOMEs) are linoleic acid-derived lipid mediators reported to be dysregulated in obstructive lung disease. In contrast to many other oxylipins, TriHOME biosynthesis in humans is still poorly understood. The association of TriHOMEs with inflammation prompted the current investigation into the ability of human granulocytes to synthesize the 16 different 9,10,13-TriHOME and 9,12,13-TriHOME isomers and of the TriHOME biosynthetic pathway. Following incubation with linoleic acid, eosinophils and (to a lesser extent) the mast cell line LAD2, but not neutrophils, formed TriHOMEs. Stereochemical analysis revealed that TriHOMEs produced by eosinophils predominantly evidenced the 13(S) configuration, suggesting 15-lipoxygenase (15-LOX)-mediated synthesis. TriHOME formation was blocked following incubation with the 15-LOX inhibitor BLX-3887 and was shown to be largely independent of soluble epoxide hydrolase and cytochrome P450 activities. TriHOME synthesis was abolished when linoleic acid was replaced with 13-HODE, but increased in incubations with 13-HpODE, indicating the intermediary role of epoxy alcohols in TriHOME formation. In contrast to eosinophils, LAD2 cells formed TriHOMEs having predominantly the 13(R) configuration, demonstrating that there are multiple synthetic routes for TriHOME formation. These findings provide for the first-time insight into the synthetic route of TriHOMEs in humans and expand our understanding of their formation in inflammatory diseases.

中文翻译:

嗜酸性粒细胞通过15-脂氧合酶依赖性过程合成三羟基十八烯酸(TriHOMEs)。

三羟基十八烯酸(TriHOMEs)是亚油酸衍生的脂质介体,据报道在阻塞性肺疾病中失调。与许多其他的脂磷脂相反,人类中TriHOME的生物合成仍然知之甚少。TriHOMEs与炎症的关联促使当前对人类粒细胞合成16种不同的9,10,13-TriHOME和9,12,13-TriHOME异构体以及TriHOME生物合成途径的能力的研究。与亚油酸孵育后,嗜酸性粒细胞和肥大细胞系LAD2(但不包括嗜中性粒细胞)(较小程度)形成TriHOMEs。立体化学分析显示,嗜酸性粒细胞产生的TriHOMEs主要证明13(S)构型,表明15-脂氧合酶(15-LOX)介导的合成。与15-LOX抑制剂BLX-3887孵育后,TriHOME的形成被阻止,并且显示出它在很大程度上与可溶性环氧化物水解酶和细胞色素P450活性无关。当用13-HODE取代亚油酸时,TriHOME的合成被取消,但在与13-HpODE的孵育中增加了TriHOME的合成,表明环氧醇在TriHOME形成中的中介作用。与嗜酸性粒细胞相反,LAD2细胞形成的TriHOMEs主要具有13(R)构型,表明存在多种合成途径形成TriHOME。这些发现提供了对人类中TriHOMEs合成途径的首次见解,并扩展了我们对它们在炎性疾病中形成的理解。当用13-HODE取代亚油酸时,TriHOME的合成被取消,但在与13-HpODE的孵育中增加了TriHOME的合成,表明环氧醇在TriHOME形成中的中介作用。与嗜酸性粒细胞相反,LAD2细胞形成的TriHOMEs主要具有13(R)构型,表明存在多种合成途径形成TriHOME。这些发现提供了对人类中TriHOMEs合成途径的首次见解,并扩展了我们对它们在炎性疾病中形成的理解。当用13-HODE取代亚油酸时,TriHOME的合成被取消,但在与13-HpODE的孵育中增加了TriHOME的合成,表明环氧醇在TriHOME形成中的中介作用。与嗜酸性粒细胞相反,LAD2细胞形成的TriHOMEs主要具有13(R)构型,表明存在多种合成途径形成TriHOME。这些发现提供了对人类中TriHOMEs合成途径的首次见解,并扩展了我们对它们在炎性疾病中形成的理解。表明TriHOME形成有多种合成途径。这些发现提供了对TriHOMEs在人体内合成途径的首次见解,并扩展了我们对它们在炎症性疾病中形成的了解。表明TriHOME形成有多种合成途径。这些发现提供了对人类中TriHOMEs合成途径的首次见解,并扩展了我们对它们在炎性疾病中形成的理解。
更新日期:2020-01-07
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