Olga V. Oskolkova , Bernd Gesslbauer , Valery Bochkov
{"title":"Simplified synthesis of oxidized phospholipids on alkyl-amide scaffold","authors":"Olga V. Oskolkova , Bernd Gesslbauer , Valery Bochkov","doi":"10.1016/j.mex.2025.103288","DOIUrl":null,"url":null,"abstract":"<div><div>Oxidized phospholipids (OxPLs), containing oxidized fatty acids (oxylipins), play a significant role in various diseases. However, studying the structure-activity relationships of OxPLs and their signaling mechanisms is challenging due to the complexity of the chemical synthesis of structurally distinct lipid species. In this study, we aimed to develop a method for attaching free oxylipins to a lysophospholipid to form OxPLs. We hypothesized that oxylipins could be conjugated to PLs <em>via</em> a known chemical reaction between activated esters of carboxylic acids and amino groups. The carboxyl groups of oxylipins were activated using N-hydroxysuccinimide and a coupling reagent, then conjugated to a lyso-phosphatidylcholine containing NH<sub>2</sub>-groupd at <em>sn</em>-2 position, forming amide bonds. All reactions were performed under mild conditions and demonstrated high yields. To prevent acyl migration, the <em>sn</em>-1 position of PLs was modified with an alkyl residue linked <em>via</em> an ether bond. Several oxylipin-containing PLs were successfully synthesized, isolated, and characterized. The anti-TLR4 and endothelial barrier-protective activities of these alkyl-amide OxPLs were found to be equivalent to diacyl-OxPLs. This method enables efficient synthesis of modified OxPLs for biological testing. The combination of ether and amide bonds enhances biological stability and simplifies effect analysis.<ul><li><span>•</span><span><div>The method describes the preparation of a single precursor for multiple choline PLs, specifically 2-deoxy-2-amino-1-lyso-<em>sn</em>-3-glycerophosphocholine, followed by the attachment of oxylipins to it.</div></span></li><li><span>•</span><span><div>No protection-deprotection steps are needed for oxylipins for the synthesis of phosphatidylcholines.</div></span></li><li><span>•</span><span><div>Isolation of compounds is performed using fast liquid-liquid and solid-phase extractions.</div></span></li></ul></div></div>","PeriodicalId":18446,"journal":{"name":"MethodsX","volume":"14 ","pages":"Article 103288"},"PeriodicalIF":1.6000,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"MethodsX","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2215016125001347","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MULTIDISCIPLINARY SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Oxidized phospholipids (OxPLs), containing oxidized fatty acids (oxylipins), play a significant role in various diseases. However, studying the structure-activity relationships of OxPLs and their signaling mechanisms is challenging due to the complexity of the chemical synthesis of structurally distinct lipid species. In this study, we aimed to develop a method for attaching free oxylipins to a lysophospholipid to form OxPLs. We hypothesized that oxylipins could be conjugated to PLs via a known chemical reaction between activated esters of carboxylic acids and amino groups. The carboxyl groups of oxylipins were activated using N-hydroxysuccinimide and a coupling reagent, then conjugated to a lyso-phosphatidylcholine containing NH2-groupd at sn-2 position, forming amide bonds. All reactions were performed under mild conditions and demonstrated high yields. To prevent acyl migration, the sn-1 position of PLs was modified with an alkyl residue linked via an ether bond. Several oxylipin-containing PLs were successfully synthesized, isolated, and characterized. The anti-TLR4 and endothelial barrier-protective activities of these alkyl-amide OxPLs were found to be equivalent to diacyl-OxPLs. This method enables efficient synthesis of modified OxPLs for biological testing. The combination of ether and amide bonds enhances biological stability and simplifies effect analysis.
•
The method describes the preparation of a single precursor for multiple choline PLs, specifically 2-deoxy-2-amino-1-lyso-sn-3-glycerophosphocholine, followed by the attachment of oxylipins to it.
•
No protection-deprotection steps are needed for oxylipins for the synthesis of phosphatidylcholines.
•
Isolation of compounds is performed using fast liquid-liquid and solid-phase extractions.