Hyderabad Eye Research Foundation (HERF), L.V. Prasad Eye Institute, Bhubaneswar 751024, India.
School of Biotechnology, KIIT University, Bhubaneswar 751024, India.
Cells. 2021 Dec 7;10(12):3448. doi: 10.3390/cells10123448.
The lack of an animal model or an in vitro model limits experimental options for studying temporal molecular events in pseudoexfoliation syndrome (PXF), an age related fibrillopathy causing trabecular meshwork damage and glaucoma. Our goal was to create a workable in vitro model of PXF using primary human TM (HTM) cell lines simulating human disease. Primary HTM cells harvested from healthy donors ( = 3), were exposed to various concentrations (5 ng/mL, 10 ng/mL, 15 ng/mL) of transforming growth factor-beta1 (TGF-β1) for different time points. Morphological change of epithelial-mesenchymal transition (EMT) was analyzed by direct microscopic visualization and immunoblotting for EMT markers. Expression of pro-fibrotic markers were analyzed by quantitative RT-PCR and immunoblotting. Cell viability and death in treated cells was analyzed using FACS and MTT assay. Protein complex and amyloid aggregate formation was analyzed by Immunofluorescence of oligomer11 and amyloid beta fibrils. Effect of these changes with pharmacological inhibitors of canonical and non-canonical TGF pathway was done to analyze the pathway involved. The expression of pro-fibrotic markers was markedly upregulated at 10 ng/mL of TGF-β1 exposure at 48-72 h of exposure with associated EMT changes at the same time point. Protein aggregates were seen maximally at these time points that were found to be localized around the nucleus and in the extracellular matrix (ECM). EMT and pro-fibrotic expression was differentially regulated by different canonical and non-canonical pathways suggesting complex regulatory mechanisms. This in vitro model using HTM cells simulated the main characteristics of human disease in PXF like pro-fibrotic gene expression, EMT, and aggregate formation.
缺乏动物模型或体外模型限制了研究假性剥脱综合征 (PXF) 中时分子事件的实验选择,PXF 是一种与年龄相关的纤维蛋白病变,可导致小梁网损伤和青光眼。我们的目标是使用模拟人类疾病的原代人 TM(HTM)细胞系创建可行的 PXF 体外模型。从健康供体中收获的原代 HTM 细胞(= 3),用不同浓度(5ng/mL、10ng/mL、15ng/mL)的转化生长因子-β1(TGF-β1)处理不同时间点。通过直接显微镜观察和 EMT 标志物的免疫印迹分析上皮-间充质转化(EMT)的形态变化。通过定量 RT-PCR 和免疫印迹分析促纤维化标志物的表达。用 FACS 和 MTT 分析处理细胞中的细胞活力和死亡。通过寡聚体 11 和淀粉样β纤维的免疫荧光分析蛋白质复合物和淀粉样聚集物的形成。用经典和非经典 TGF 途径的药理学抑制剂分析这些变化的作用,以分析涉及的途径。在 TGF-β1 暴露 10ng/mL、48-72 小时时,促纤维化标志物的表达明显上调,并在同一时间点出现 EMT 变化。在这些时间点观察到最大的蛋白质聚集体,这些聚集体被发现位于核周围和细胞外基质 (ECM) 中。EMT 和促纤维化表达由不同的经典和非经典途径差异调节,表明存在复杂的调节机制。该使用 HTM 细胞的体外模型模拟了 PXF 中人类疾病的主要特征,如促纤维化基因表达、EMT 和聚集体形成。