Occurrence of cytotoxic 9-oxononanoyl secosterol aldehydes in human low-density lipoprotein
摘要:
The reaction products of three major cholesteryl esters, cholesteryl palmitate (C16:0-CE), cholesteryl oleate (C18:1-CE), and cholesteryl linoleate (C18:2-CE), present in human low-density lipoprotein (LDL) treated with ozone were isolated and characterized. In vitro ozonization of C16:0-CE was found to form the palmitoyl ester of secosterol-A (3 beta-hydroxy-5-oxo-5,6-secocholestan-6-al) and its aldolization product secosterol-B (3 beta-hydroxy-5 beta-hydroxy-B-norcholestane-6 beta-carboxaldehyde). On the other hand, when C18:1-CE and C18:2-CE were oxidized by ozone, the aldehyde 9-oxononanoyl cholesterol (9-ONC) was formed as a primary product, which was then further oxidized to form 9-oxononanoyl secosterol-A (9-ON-secoA) and 9-oxononanoyl secosterol-B (9-ON-secoB). The compounds 9-ON-secoA and -B, but not 9-ONC, were found to exhibit strong cytotoxicity against human leukemia HL-60 cells. An LC-ESI-MS/MS method was developed for the detection of these cholesteryl ester ozonolysis products by derivatizing them with dansyl hydrazine. Using this method, we found for the first time that low concentrations of 9-ON-secoA and -B, but not palmitoyl secosterols, were present in human LDL. These novel oxidized cholesterol esters, 9ON-secoA and -B, probably play important roles in the pathogenesis of several inflammatory disorders such as cancer, diabetes, atherosclerosis, and neurodegenerative diseases. (C) 2013 Elsevier Inc. All rights reserved.
Lipid Mass Tags via Aziridination for Probing Unsaturated Lipid Isomers and Accurate Relative Quantification**
作者:Tingyuan Yang、Shuli Tang、Syuan‐Ting Kuo、Dallas Freitas、Madison Edwards、Hongying Wang、Yuxiang Sun、Xin Yan
DOI:10.1002/anie.202207098
日期:2022.9.26
aziridine-based isobaric labeling strategy is developed for lipidaccuraterelativequantification, isomer identification, and ionization efficiency improvement. This strategy allows multiplex analysis without using lipid internal standards and characterization of lipid double-bond positional isomers. We envision it will accelerate the discovery of lipid biomarkers for early disease diagnosis, progression
[EN] STEROLS, ESTERS WITH FATTY ACIDS AND GLUCOSIDES OF SUCH STEROLS; A METHOD OF PREPARATION THEREOF; SPONTANEOUSLY DISPERSABLE AGENTS CONTAINING THESE COMPOUNDS; AND THE USE OF SUCH AGENTS TO TREAT TUMOURS
申请人:MARIGEN S.A.
公开号:WO1991001139A1
公开(公告)日:1991-02-07
(DE) Es werden antitumorale Sterole, deren Fettsäureester und Glucoside, Verfahren zu ihrer Herstellung, spontan dispergierbare Mittel mit diesen Sterolen, deren Fettsäureester und Glucoside, und ihre Verwendung zur Behandlung von Tumoren beschrieben.(EN) Described are sterols, their esters with fatty acids and their glucosides, a method of preparation thereof, spontaneously dispersable agents containing these sterols, their esters with fatty acids or their glucosides, and the use of such agents in the treatment of tumours.(FR) On décrit des stérols antitumoraux, leurs esters d'acides gras et leur glucosides, le procédé pour leur fabrication, les agents spontanément dispersibles avec ces stérols, leurs esters d'acides gras et leur glucosides, ainsi que leur utilisation pour le traitement des tumeurs.
STEROLE, DEREN FETTSÄUREESTER UND GLUCOSIDE; VERFAHREN ZU IHRER HERSTELLUNG; SPONTAN DISPERGIERBARE MITTEL MIT DIESEN VERBINDUNGEN, SOWIE IHRE VERWENDUNG ZUR BEHANDLUNG VON TUMOREN
申请人:MARIGEN S.A.
公开号:EP0436682A1
公开(公告)日:1991-07-17
US5270041A
申请人:——
公开号:US5270041A
公开(公告)日:1993-12-14
Lipid Markers of “Geometrical” Radical Stress: Synthesis of Monotrans Cholesteryl Ester Isomers and Detection in Human Plasma
transform cis unsaturated fattyacids to the thermodynamically more stable, but unnatural, trans configuration. The "geometrical" radical stress can be estimated in biological samples using trans fattyacid isomers as lipid markers. Regioselectivity is an important feature of the "geometrical" radical stress, because the supramolecularorganization of the polyunsaturatedfattyacid moieties of phospholipids