Artifactual FA dimers mimic FAHFA signals in untargeted metabolomics pipelines.
Artifactual FA dimers mimic FAHFA signals in untargeted metabolomics pipelines.
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DOI:
10.1016/j.jlr.2022.100201
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发表时间:
2022-05
影响因子:
6.5
通讯作者:
Puchalska P
中科院分区:
文献类型:
--
作者:
Nelson AB;Chow LS;Hughey CC;Crawford PA;Puchalska P
FA esters of hydroxy FAs (FAHFAs) are lipokines with extensive structural and regional isomeric diversity that impact multiple physiological functions, including insulin sensitivity and glucose homeostasis. Because of their low molar abundance, FAHFAs are typically quantified using highly sensitive LC-MS/MS methods. Numerous relevant MS databases house in silico-spectra that allow identification and speciation of FAHFAs. These provisional chemical feature assignments provide a useful starting point but could lead to misidentification. To address this possibility, we analyzed human serum with a commonly applied high-resolution LC-MS untargeted metabolomics platform. We found that many chemical features are putatively assigned to the FAHFA lipid class based on exact mass and fragmentation patterns matching spectral databases. Careful validation using authentic standards revealed that many investigated signals provisionally assigned as FAHFAs are in fact FA dimers formed in the LC-MS pipeline. These isobaric FA dimers differ structurally only by the presence of an olefinic bond. Furthermore, stable isotope-labeled oleic acid spiked into human serum at subphysiological concentrations showed concentration-dependent formation of a diverse repertoire of FA dimers that analytically mimicked FAHFAs. Conversely, validated FAHFA species did not form spontaneously in the LC-MS pipeline. Together, these findings underscore that FAHFAs are endogenous lipid species. However, nonbiological FA dimers forming in the setting of high concentrations of FFAs can be misidentified as FAHFAs. Based on these results, we assembled a FA dimer database to identify nonbiological FA dimers in untargeted metabolomics datasets.
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影响因子:
48
作者:
Gine, Roger;CapeHades, Jordi;Badia, Josep M.;Vughs, Dennis;Schwaiger-Haber, Michaela;Alexandrov, Theodore;Vinaixa, Maria;Brunner, Andrea M.;Patti, Gary J.;Yanes, Oscar
通讯作者:
Yanes, Oscar
DOI:
10.1007/978-1-0716-0239-3_9
发表时间:
2020
期刊:
Methods in molecular biology (Clifton, N.J.)
影响因子:
--
作者:
Montenegro-Burke, J Rafael;Guijas, Carlos;Siuzdak, Gary
通讯作者:
Siuzdak, Gary
影响因子:
7.4
作者:
Mahieu NG;Patti GJ
通讯作者:
Patti GJ
影响因子:
7.4
作者:
Fu, Xiaorong;Deja, Stanislaw;Burgess, Shawn C.
通讯作者:
Burgess, Shawn C.
影响因子:
7.4
作者:
Kolar MJ;Nelson AT;Chang T;Ertunc ME;Christy MP;Ohlsson L;Härröd M;Kahn BB;Siegel D;Saghatelian A
通讯作者:
Saghatelian A