Department of Optometry and Vision Science, School of Optometry, University of Alabama at Birmingham, Birmingham, AL, USA.
Centre for Ocular Research & Education, School of Optometry & Vision Science, University of Waterloo, Waterloo, Ontario, Canada; Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong.
Ocul Surf. 2022 Jan;23:12-23. doi: 10.1016/j.jtos.2021.10.009. Epub 2021 Nov 11.
PURPOSE: This study evaluated the presence and roles of cholesteryl esters (CEs) and wax esters (WEs) from human tear film and meibum in meibomian gland dysfunction (MGD). METHODS: Out of 195 enrolled subjects, 164 and 179 subjects provided tear and meibum samples, respectively. Subjects were classified into normal, asymptomatic MGD, MGD, and mixed (MGD & aqueous deficient). The precorneal tear film (PCTF) thinning rate (evaporation) was measured using optical coherence tomography. Lipids extracted from tear and meibum samples were infused into a SCIEX 5600 TripleTOF mass spectrometer. CE and WE intensities quantified with Analyst 1.7 TF and LipidView 1.3 were compared across disease groups in MetaboAnalyst 5.0 and correlated with PCTF thinning rates. RESULTS: The numbers of unique CEs and WEs identified in the samples were 125 and 86, respectively. Unsupervised Principal Component (PC) analysis and supervised Partial Least Square Discriminant analysis exhibited little separation among groups for both CEs and WEs in tears and meibum. Spearman's correlation analyses showed no association between either the first or second PC scores with PCTF thinning rates. CONCLUSION: The abundances of human PCTF and meibum-derived CEs and WEs were independent of MGD disease status and PCTF thinning (evaporation). CEs and WEs alterations do not contribute to alterations in tear film dynamics in MGD, such as has been demonstrated by the (O-acyl) ω-hydroxy fatty acids (OAHFAs).
目的:本研究评估了人泪膜和睑脂中的胆固醇酯(CEs)和蜡酯(WEs)在睑板腺功能障碍(MGD)中的存在和作用。
方法:在 195 名入组受试者中,有 164 名和 179 名受试者分别提供了泪液和睑脂样本。受试者被分为正常、无症状 MGD、MGD 和混合(MGD 和水性缺乏)。使用光学相干断层扫描测量了角膜前泪膜(PCTF)的变薄率(蒸发)。从泪液和睑脂样本中提取的脂质被注入 SCIEX 5600 TripleTOF 质谱仪。使用 Analyst 1.7 TF 和 LipidView 1.3 定量分析 CE 和 WE 强度,并在 MetaboAnalyst 5.0 中比较不同疾病组之间的差异,并与 PCTF 变薄率相关。
结果:在样本中鉴定出的独特 CE 和 WE 数量分别为 125 和 86。非监督主成分(PC)分析和监督偏最小二乘判别分析显示,无论是在泪液还是睑脂中,CEs 和 WEs 在各组之间的分离都很小。Spearman 相关分析显示,第一或第二 PC 评分与 PCTF 变薄率之间均无关联。
结论:人 PCTF 和睑脂来源的 CEs 和 WEs 的丰度与 MGD 疾病状态和 PCTF 变薄(蒸发)无关。CEs 和 WEs 的改变不会导致 MGD 中泪膜动力学的改变,如(O-酰基)ω-羟基脂肪酸(OAHFAs)所证明的那样。
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