Liver X Receptor–Growth Differentiation Factor 15 Activation Drives Profibrotic Changes in the Aqueous Outflow Tract of Uveitic Glaucoma

IF 4.7 2区 医学 Q1 PATHOLOGY
Hyun Hee Ju , Jiyoung Lee , Seon-Kyu Kim , Seon-Young Kim , Jin-Hyun Ahn , Nikolai Skiba , Vasantha Rao , Jin A. Choi
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引用次数: 0

Abstract

Cytomegalovirus (CMV)–induced anterior uveitis is linked to increased intraocular pressure, suggesting profibrotic changes in the eye's drainage system. Previous studies on the aqueous humor (AH) of patients with CMV uveitic glaucoma (UG) highlighted the activation of the liver X receptor (LXR) pathway, yet a potential that it has a role in increased intraocular pressure remained unelucidated. Herein, the LXR pathway's role in AH outflow in UG was explored. Global transcriptional analysis revealed that LXR activation primarily induces transforming growth factor-β signaling, with growth differentiation factor 15 (GDF-15), a growth factor in the transforming growth factor-β superfamily, being one of the most up-regulated genes in LXR-agonist–treated trabecular meshwork cells. GDF-15 levels showed a twofold expression in the AH of patients with UG (n = 44) compared with controls (n = 24; P = 0.024) and increased with more anti-glaucoma eyedrops and glaucoma surgeries (P < 0.05). LXRα/β and GDF-15 were found in human outflow tissue and were up-regulated by lipopolysaccharide and CMV infection. In an experimental endotoxin uveitis model, GDF-15 levels were up-regulated by the treatment with LXR agonists and lipopolysaccharide. In human trabecular meshwork cells, LXR agonists triggered actin stress fiber formation and α-smooth muscle actin expression, both reduced by GDF-15 neutralization. These results suggest that the LXR–GDF-15 pathway contributes to profibrotic changes in UG and plays a role in disease pathogenesis.
LXR-GDF15激活驱动青光眼水流出道纤维化改变
巨细胞病毒(CMV)诱导的前葡萄膜炎与眼内压(IOP)升高有关,提示眼睛引流系统发生促纤维化改变。先前对巨细胞病毒青光眼(UG)患者房水(AH)的研究强调了肝脏X受体(LXR)途径的激活,但它们在IOP升高中的潜在作用仍未阐明。本文中,我们探讨了LXR通路在UG中AH流出中的作用。全球转录分析显示,LXR激活主要诱导TGF-β信号传导,TGF-β超家族中的生长因子GDF-15是LXR激动剂处理的小梁网(TM)细胞中表达上调最多的基因之一。GDF-15水平在UG患者(n=44)的AH中表达为对照组(n=24)的两倍(p = 0.024),并且随着抗青光眼滴眼液和青光眼手术次数的增加而升高(p < 0.05)。LXRα/β和GDF-15存在于人流出液组织中,并在LPS和CMV感染下上调。在实验性内毒素葡萄膜炎模型中,LXR激动剂和LPS可上调GDF-15水平。在人TM细胞中,LXR激动剂触发肌动蛋白应激纤维的形成和α-SMA的表达,两者都被GDF中和降低。这些结果提示LXR-GDF-15通路参与了UG的促纤维化改变,并在疾病发病机制中发挥作用。
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来源期刊
CiteScore
11.40
自引率
0.00%
发文量
178
审稿时长
30 days
期刊介绍: The American Journal of Pathology, official journal of the American Society for Investigative Pathology, published by Elsevier, Inc., seeks high-quality original research reports, reviews, and commentaries related to the molecular and cellular basis of disease. The editors will consider basic, translational, and clinical investigations that directly address mechanisms of pathogenesis or provide a foundation for future mechanistic inquiries. Examples of such foundational investigations include data mining, identification of biomarkers, molecular pathology, and discovery research. Foundational studies that incorporate deep learning and artificial intelligence are also welcome. High priority is given to studies of human disease and relevant experimental models using molecular, cellular, and organismal approaches.
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