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糖脂和甘油磷脂信号改变驱动肾上腺脑白质营养不良中的炎症级联反应。

Altered glycolipid and glycerophospholipid signaling drive inflammatory cascades in adrenomyeloneuropathy.

作者信息

Ruiz Montserrat, Jové Mariona, Schlüter Agatha, Casasnovas Carlos, Villarroya Francesc, Guilera Cristina, Ortega Francisco J, Naudí Alba, Pamplona Reinald, Gimeno Ramón, Fourcade Stéphane, Portero-Otín Manuel, Pujol Aurora

机构信息

Neurometabolic Diseases Laboratory, Bellvitge Biomedical Research Institute (IDIBELL), 08908 L'Hospitalet de Llobregat, Barcelona, Spain, Institute of Neuropathology, University of Barcelona, 08908 L'Hospitalet de Llobregat, Barcelona, Spain, Center for Biomedical Research on Rare Diseases (CIBERER).

Experimental Medicine Department, University of Lleida-IRBLleida, Lleida, Spain.

出版信息

Hum Mol Genet. 2015 Dec 15;24(24):6861-76. doi: 10.1093/hmg/ddv375. Epub 2015 Sep 14.

Abstract

X-linked adrenomyeloneuropathy (AMN) is an inherited neurometabolic disorder caused by malfunction of the ABCD1 gene, characterized by slowly progressing spastic paraplegia affecting corticospinal tracts, and adrenal insufficiency. AMN is the most common phenotypic manifestation of adrenoleukodystrophy (X-ALD). In some cases, an inflammatory cerebral demyelination occurs associated to poor prognosis in cerebral AMN (cAMN). Though ABCD1 codes for a peroxisomal transporter of very long-chain fatty acids, the molecular mechanisms that govern disease onset and progression, or its transformation to a cerebral, inflammatory demyelinating form, remain largely unknown. Here we used an integrated -omics approach to identify novel biomarkers and altered network dynamic characteristic of, and possibly driving, the disease. We combined an untargeted metabolome assay of plasma and peripheral blood mononuclear cells (PBMC) of AMN patients, which used liquid chromatography coupled to quadrupole-time-of-flight mass spectrometry (LC-Q-TOF), with a functional genomics analysis of spinal cords of Abcd1(-) mouse. The results uncovered altered nodes in lipid-driven proinflammatory cascades, such as glycosphingolipid and glycerophospholipid synthesis, governed by the β-1,4-galactosyltransferase (B4GALT6), the phospholipase 2γ (PLA2G4C) and the choline/ethanolamine phosphotransferase (CEPT1) enzymes. Confirmatory investigations revealed a non-classic, inflammatory profile, consisting on the one hand of raised plasma levels of several eicosanoids derived from arachidonic acid through PLA2G4C activity, together with also the proinflammatory cytokines IL6, IL8, MCP-1 and tumor necrosis factor-α. In contrast, we detected a more protective, Th2-shifted response in PBMC. Thus, our findings illustrate a previously unreported connection between ABCD1 dysfunction, glyco- and glycerolipid-driven inflammatory signaling and a fine-tuned inflammatory response underlying a disease considered non-inflammatory.

摘要

X连锁肾上腺脑白质营养不良(AMN)是一种由ABCD1基因功能异常引起的遗传性神经代谢疾病,其特征为影响皮质脊髓束的缓慢进展性痉挛性截瘫和肾上腺功能不全。AMN是肾上腺脑白质营养不良(X-ALD)最常见的表型表现。在某些情况下,会出现与脑型AMN(cAMN)预后不良相关的炎症性脑脱髓鞘。尽管ABCD1编码一种过氧化物酶体超长链脂肪酸转运蛋白,但控制疾病发生、发展或其向脑型、炎症性脱髓鞘形式转变的分子机制仍 largely未知。在这里,我们使用综合组学方法来识别该疾病的新型生物标志物,并改变其网络动态特征以及可能驱动疾病的因素。我们将AMN患者血浆和外周血单核细胞(PBMC)的非靶向代谢组分析(使用液相色谱-四极杆-飞行时间质谱(LC-Q-TOF))与Abcd1(-)小鼠脊髓的功能基因组学分析相结合。结果揭示了脂质驱动的促炎级联反应中节点的改变,如由β-1,4-半乳糖基转移酶(B4GALT6)、磷脂酶2γ(PLA2G4C)和胆碱/乙醇胺磷酸转移酶(CEPT1)酶控制的糖鞘脂和甘油磷脂合成。验证性研究揭示了一种非经典的炎症特征,一方面包括通过PLA2G4C活性从花生四烯酸衍生的几种类花生酸的血浆水平升高,以及促炎细胞因子IL6、IL8、MCP-1和肿瘤坏死因子-α。相比之下,我们在PBMC中检测到一种更具保护性的、Th2偏移的反应。因此,我们的研究结果说明了ABCD1功能障碍、糖脂和甘油脂驱动的炎症信号与一种被认为是非炎症性疾病背后的微调炎症反应之间以前未报道的联系。

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