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Deep learning-based diagnostic classification of multiple sclerosis using multicenter optical coherence tomography data 基于深度学习的多中心光学相干断层成像数据多发性硬化症诊断分类。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-10 DOI: 10.1016/j.exer.2026.110916
Zahra Khodabandeh , Hossein Rabbani , Neda Shirani Bidabadi , Fereshteh Ashtari , David H. Steel , Jaume Bacardit , Anya Hurlbert , Raheleh Kafieh

Background

Multiple sclerosis (MS) is a chronic inflammatory disorder of the central nervous system, where timely and accurate diagnosis is essential for effective management. Optical coherence tomography (OCT) enables non-invasive evaluation of retinal changes that may serve as biomarkers for MS. Unlike other ophthalmologic diseases, raw cross-sectional OCT images in MS show subtle alterations often indistinguishable from healthy controls (HCs). Consequently, retinal layer thickness and boundary-derived surface features offer greater discriminatory power.

Methods

We investigated three categories of artificial intelligence (AI) models: (1) feature extraction with auto-encoder (AE) and shallow networks, (2) custom-designed deep networks, and (3) fine-tuned pre-trained networks. Retinal layer thickness and surface maps derived from OCT were analyzed to determine the most informative features, with channel-wise combination and mosaicing applied for feature integration. Model interpretability was assessed using occlusion sensitivity and Gradient-weighted Class Activation Mapping (Grad-CAM) visualizations. The dataset included 38 HC and 78 MS eyes obtained from independent public and local sources. Patient-wise partitioning was implemented to prevent data leakage.

Results

The proposed deep network using channel-wise combined thickness maps of retinal nerve fiber layer (RNFL), ganglion cell and inner plexiform layer (GCIPL), and inner nuclear layer (INL) layers achieved balanced accuracy of 97.3% (SD = 4.16; 95% CI: 92.3–100%), specificity of 97.3% (SD = 5.59; 95% CI: 92.6–100%), sensitivity of 97.4% (SD = 3.54; 95% CI: 92.6–100%), g-mean of 97.3% (SD = 4.18; 95% CI: 92.24-100%), F1-score of 98.0% (SD = 3.86; 95% CI: 92.6–100%), and an AUC of 0.96 (SD = 0.08; 95% CI: 0.95–1.00). Notably, the high performance observed in internal cross-validation was achieved when public and local datasets were combined. However, performance decreased substantially in cross-dataset evaluations, where models were trained on one dataset and tested on the other, indicating limited external generalizability, particularly when trained on public data and applied to local clinical data.

Conclusions

AI-based analysis of OCT-derived retinal layer features enables accurate and interpretable classification of MS, supporting its potential as a valuable clinical biomarker.
背景:多发性硬化症(MS)是一种中枢神经系统的慢性炎症性疾病,及时准确的诊断对有效的治疗至关重要。光学相干断层扫描(OCT)可以对视网膜变化进行无创评估,这些变化可能作为MS的生物标志物。与其他眼科疾病不同,MS的原始横断面OCT图像显示出与健康对照(hc)难以区分的细微变化。因此,视网膜层厚度和边界派生的表面特征提供了更大的区分能力。方法:我们研究了三类人工智能(AI)模型:(1)基于自编码器(AE)和浅层网络的特征提取,(2)定制设计的深层网络,以及(3)微调预训练网络。通过分析OCT得到的视网膜层厚度和表面图来确定最具信息量的特征,并使用通道组合和马赛克进行特征集成。使用遮挡敏感性和梯度加权类激活映射(梯度- cam)可视化来评估模型的可解释性。数据集包括38只HC和78只MS眼睛,这些眼睛来自独立的公共和当地来源。实现了病人分区以防止数据泄漏。结果:采用视网膜神经纤维层(RNFL)、神经节细胞和内丛状层(GCIPL)和内核层(INL)层的通道联合厚度图构建的深度网络,平衡准确率为97.3% (SD = 4.16, 95% CI: 92.3-100%),特异性为97.3% (SD = 5.59, 95% CI: 92.6-100%),灵敏度为97.4% (SD = 3.54, 95% CI: 92.6-100%), g均值为97.3% (SD = 4.18, 95% CI: 92.24-100%), f1评分为98.0% (SD = 3.86;95% CI: 92.6-100%), AUC为0.96 (SD = 0.08; 95% CI: 0.95-1.00)。值得注意的是,当公共数据集和本地数据集相结合时,在内部交叉验证中观察到的高性能得到了实现。然而,在跨数据集评估中,性能大幅下降,其中模型在一个数据集上训练并在另一个数据集上测试,这表明有限的外部泛化性,特别是在公共数据上训练并应用于本地临床数据时。结论:基于人工智能的oct衍生视网膜层特征分析能够准确和可解释地对MS进行分类,支持其作为有价值的临床生物标志物的潜力。
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引用次数: 0
Response to comments on “Circadian rhythm disruption induces myopia in mice” 对“昼夜节律紊乱导致小鼠近视”评论的回应。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-09 DOI: 10.1016/j.exer.2026.110889
Wei-Ling Bai , Mei-Jun Wang , Jia-He Gan , Ying Huang , Zi-Han Liu , Cong-Ying Li , Ning-Li Wang , Shi-Ming Li
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引用次数: 0
Role of NDUFS1 in mitochondrial dysfunction and oxidative stress in glaucomatous retinal ganglion cells NDUFS1在青光眼视网膜神经节细胞线粒体功能障碍和氧化应激中的作用。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-09 DOI: 10.1016/j.exer.2026.110913
Jing Zhang , Lin Jiang , Xiao Zheng
This study investigates the role of NDUFS1, a subunit of mitochondrial complex I, in glaucomatous retinal ganglion cell (RGC) injury and determines whether it mediates RGC apoptosis through regulating mitochondrial dysfunction and oxidative stress (OS). A microbead-induced glaucoma mouse model was established. Intraocular pressure (IOP) measurements, retinal whole-mount immunofluorescence staining, TUNEL assay, and OS marker detection were conducted to assess RGC survival, apoptosis, and OS. In vitro, NDUFS1 was knocked down or overexpressed in R28 retinal cells. JC-1 staining, adenosine triphosphate (ATP) assay, and flow cytometry were employed to analyze the impacts of NDUFS1 on mitochondrial membrane potential, energy metabolism, OS, and apoptosis. Finally, adeno-associated virus-mediated NDUFS1 overexpression (AAV-oe-NDUFS1) was delivered via intravitreal injection to validate its protective effects in vivo. In vivo experiments revealed downregulation of NDUFS1 expression in the retinas of glaucoma mice, accompanied by significant RGC loss, enhanced OS, and increased apoptosis. In vitro, NDUFS1 knockdown induced mitochondrial membrane depolarization, reduced ATP synthesis, exacerbated OS, and ultimately promoted apoptosis. Conversely, NDUFS1 overexpression effectively reversed these pathological phenotypes. Rescue experiments in vivo further demonstrated that NDUFS1 upregulation alleviated OS, suppressed apoptosis, and significantly improved RGC survival. NDUFS1 downregulation plays a critical role in glaucomatous RGC injury. Overexpression of NDUFS1 improves mitochondrial function, attenuates OS, and enhances cell survival. The study provides novel mechanistic insights into neuroprotection in glaucoma and suggests NDUFS1 as a potential therapeutic target.
本研究探讨线粒体复合体I亚基NDUFS1在青光眼视网膜神经节细胞(RGC)损伤中的作用,并确定其是否通过调节线粒体功能障碍和氧化应激(OS)介导RGC凋亡。建立小鼠微珠性青光眼模型。通过眼内压(IOP)测量、视网膜全载免疫荧光染色、TUNEL测定和OS标志物检测来评估RGC存活、凋亡和OS。在体外,NDUFS1在R28视网膜细胞中被敲低或过表达。采用JC-1染色、三磷酸腺苷(ATP)测定和流式细胞术分析NDUFS1对线粒体膜电位、能量代谢、OS和凋亡的影响。最后,腺相关病毒介导的NDUFS1过表达(AAV-oe-NDUFS1)通过玻璃体内注射传递,以验证其在体内的保护作用。体内实验显示,青光眼小鼠视网膜NDUFS1表达下调,RGC明显丢失,OS增强,细胞凋亡增加。在体外,NDUFS1敲低诱导线粒体膜去极化,减少ATP合成,加重OS,最终促进细胞凋亡。相反,NDUFS1过表达有效地逆转了这些病理表型。体内救援实验进一步证实,NDUFS1上调可减轻OS,抑制凋亡,显著提高RGC存活。NDUFS1下调在青光眼RGC损伤中起关键作用。过表达NDUFS1可改善线粒体功能,减轻OS,提高细胞存活率。该研究为青光眼的神经保护提供了新的机制见解,并提示NDUFS1是潜在的治疗靶点。
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引用次数: 0
Effect of chemokine and chemokine-receptor gene polymorphisms on the development of diabetic retinopathy in the Turkish cohort 趋化因子和趋化因子受体基因多态性对土耳其队列糖尿病视网膜病变发展的影响。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-08 DOI: 10.1016/j.exer.2026.110912
Ebru Alp , Egemen Akgun , Sibel Doguizi , Fadime Mutlu Icduygu , Mehmet Ali Sekeroglu , Murat Atabey Ozer
It is known that in many acute and chronic inflammatory diseases, chemokines are secreted into the environment and increase during the inflammation process. Inflammation is thought to be important in the pathogenesis of diabetic retinopathy (DR) and various cytokines and chemokines play a role. Accordingly, the aim of the present study is to determine the relationship between DR and chemokines and their receptor gene polymorphisms (CXCL12, CXCR4, CCL2, CCR2) in Turkish population. This study included 353 patients with type 2 diabetes mellitus (with and without retinopathy) and 204 controls. Genomic DNA was isolated from whole blood and genotype distribution of polymorphisms was determined by PCR-RFLP method. It was determined that the G allele of the CCL2 rs1024611 SNP could prevent the development of DR (1.42 fold) and PDR (proliferative diabetic retinopathy) (1.92 fold). Binary logistic regression analysis also showed that the TT genotype of CXCL12 rs1801157 SNP may have a protective effect (OR = 0.258) on the development of DR. In contrast, CXCR4/rs2228014 and CCR2/rs1799864 SNPs did not show a significant effect on DR in the Turkish population. Findings of the present study suggest that the CCL2 rs1024611 SNP may play a role in the etiology of DR and PDR, and the G allele has a protective effect in Turkish population. Furthermore, TT genotype of CXCL12 rs1801157 SNP may also provide protection against the development of DR. Large-scale studies including a large number of patients are recommended to confirm these results.
众所周知,在许多急慢性炎症性疾病中,趋化因子在炎症过程中分泌到环境中并增加。炎症被认为在糖尿病视网膜病变(DR)的发病机制中起重要作用,多种细胞因子和趋化因子在其中起作用。因此,本研究的目的是确定土耳其人群中DR与趋化因子及其受体基因多态性(CXCL12、CXCR4、CCL2、CCR2)之间的关系。本研究包括353例2型糖尿病患者(伴有或不伴有视网膜病变)和204例对照。从全血中分离基因组DNA,采用PCR-RFLP法测定多态性基因型分布。结果表明,CCL2 rs1024611 SNP的G等位基因可预防DR(1.42倍)和PDR(增殖性糖尿病视网膜病变)(1.92倍)的发生。二元logistic回归分析还显示,TT基因型CXCL12 rs1801157 SNP可能对DR的发生有保护作用(OR = 0.258),而CXCR4/rs2228014和CCR2/rs1799864 SNP对土耳其人群DR的发生无显著影响。本研究结果提示CCL2 rs1024611 SNP可能在DR和PDR的病因学中发挥作用,G等位基因在土耳其人群中具有保护作用。此外,CXCL12 rs1801157 SNP的TT基因型也可能对dr的发展提供保护,建议包括大量患者在内的大规模研究来证实这些结果。
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引用次数: 0
Re-evaluating “Circadian rhythm disruption induces myopia in mice”: The need to consider sex as a biological variable in translational myopia research 重新评估“昼夜节律中断诱导小鼠近视”:需要考虑性别作为翻译近视研究的生物学变量。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-01-30 DOI: 10.1016/j.exer.2026.110888
Gang Chen, Yixia Zhang
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引用次数: 0
Fundus albipunctatus disease-associated RDH5/L310delinsEV mutation undertakes AMFR-mediated polyubiquitination and degradation in proteasome 白斑眼底病相关RDH5/L310delinsEV突变在amfr介导的蛋白酶体中发生多泛素化和降解。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-10 DOI: 10.1016/j.exer.2026.110927
Yichen Dong , Rong Xue , Yi Zhang , Xiaolin Jia , Mingjun Jiang , Mengjiao Xue , Xuyan Peng , Guangming Wan , Yanzhong Hu
Genetic mutations in retinol dehydrogenase 5 (RDH5) are associated with the inherited autosomal recessive retinal degeneration diseases, especially fundus albipunctatus (FA). Most of RDH5 mutants exhibit downregulation of RDH5 protein expression. However, the regulatory mechanism remains unclear. Here, we studied the metabolism of RDH5/L310delinsEV mutation, an indel mutation closely associated with the inherited FA disease. The half-life of RDH5/L310delinsEV was much less than RDH5/WT. Unlike RDH5/WT, which normally underwent degradation in autophagy-lysosomes, the RDH5/L310delinsEV reduced its location to the endoplasmic reticulum and was easy to be polyubiquitinated and degraded in the ubiquitin-proteasome pathway. Both RDH5/WT and RDH5/L310delinsEV interacted with autocrine motility factor receptor (AMFR), which is an E3 ligase on the endoplasmic reticulum. Overexpression of or knockdown of AMFR by siRNA increased or reduced the degradation of RDH5/L310delinsEV. The lysine 179 and lysine 263 of RDH5/L310delinsEV protein were polyubiquitination sites by AMFR. Mutation of K179R and K263R in RDH5/L310delinsEV protein reduced AMFR-mediated polyubiquitination and degradation. Taken together, these results highlight that RDH5/L310delinsEV mutant in RDH5 causes a rapid degradation in the ubiquitin-proteasome pathway. The fast degradation of RDH5/L310delinsEV may be associated with the FA development.
视黄醇脱氢酶5 (RDH5)基因突变与遗传性常染色体隐性视网膜变性疾病,特别是白斑眼底(FA)有关。大多数RDH5突变体表现为RDH5蛋白表达下调。然而,监管机制仍不清楚。在这里,我们研究了RDH5/L310delinsEV突变的代谢,这是一个与遗传性FA疾病密切相关的indel突变。RDH5/L310delinsEV的半衰期远小于RDH5/WT。与RDH5/WT通常在自噬溶酶体中降解不同,RDH5/L310delinsEV将其位置降低到内质网,并且易于在泛素-蛋白酶体途径中被多泛素化和降解。RDH5/WT和RDH5/L310delinsEV与自分泌运动因子受体(AMFR)相互作用,AMFR是内质网上的E3连接酶。通过siRNA过表达或敲低AMFR可增加或减少RDH5/L310delinsEV的降解。RDH5/L310delinsEV蛋白的赖氨酸179和赖氨酸263是AMFR检测到的多泛素化位点。RDH5/L310delinsEV蛋白中K179R和K263R的突变降低了amfr介导的多泛素化和降解。综上所述,这些结果表明RDH5/L310delinsEV突变体在RDH5中引起泛素-蛋白酶体途径的快速降解。RDH5/L310delinsEV的快速降解可能与FA的发展有关。
{"title":"Fundus albipunctatus disease-associated RDH5/L310delinsEV mutation undertakes AMFR-mediated polyubiquitination and degradation in proteasome","authors":"Yichen Dong ,&nbsp;Rong Xue ,&nbsp;Yi Zhang ,&nbsp;Xiaolin Jia ,&nbsp;Mingjun Jiang ,&nbsp;Mengjiao Xue ,&nbsp;Xuyan Peng ,&nbsp;Guangming Wan ,&nbsp;Yanzhong Hu","doi":"10.1016/j.exer.2026.110927","DOIUrl":"10.1016/j.exer.2026.110927","url":null,"abstract":"<div><div>Genetic mutations in <em>retinol dehydrogenase 5</em> (<em>RDH5</em>) are associated with the inherited autosomal recessive retinal degeneration diseases, especially fundus albipunctatus (FA). Most of RDH5 mutants exhibit downregulation of RDH5 protein expression. However, the regulatory mechanism remains unclear. Here, we studied the metabolism of RDH5/L310delinsEV mutation, an indel mutation closely associated with the inherited FA disease. The half-life of RDH5/L310delinsEV was much less than RDH5/WT. Unlike RDH5/WT, which normally underwent degradation in autophagy-lysosomes, the RDH5/L310delinsEV reduced its location to the endoplasmic reticulum and was easy to be polyubiquitinated and degraded in the ubiquitin-proteasome pathway. Both RDH5/WT and RDH5/L310delinsEV interacted with autocrine motility factor receptor (AMFR), which is an E3 ligase on the endoplasmic reticulum. Overexpression of or knockdown of AMFR by siRNA increased or reduced the degradation of RDH5/L310delinsEV. The lysine 179 and lysine 263 of RDH5/L310delinsEV protein were polyubiquitination sites by AMFR. Mutation of K179R and K263R in RDH5/L310delinsEV protein reduced AMFR-mediated polyubiquitination and degradation. Taken together, these results highlight that RDH5/L310delinsEV mutant in RDH5 causes a rapid degradation in the ubiquitin-proteasome pathway. The fast degradation of RDH5/L310delinsEV may be associated with the FA development.</div></div>","PeriodicalId":12177,"journal":{"name":"Experimental eye research","volume":"266 ","pages":"Article 110927"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146178452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The hypoxia-mediated HIF-1α/miR-381-3p signaling pathway promotes retinal neovascularization 缺氧介导的HIF-1α/miR-381-3p信号通路促进视网膜新生血管。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-10 DOI: 10.1016/j.exer.2026.110925
Qingguo Guo , Xin Xu , Qicheng Tian , Haoran Zhu , Lei Pei , Guangzuo Luo , Ying Liu
Retinal neovascularization is a common pathological feature of various retinal vascular diseases and is typically induced by hypoxia. In recent studies, the regulatory role of microRNA (miRNA)-mediated signaling in retinal neovascularization has been extensively characterized. However, although hypoxia-induced miRNA dysregulation has been identified, the specific mechanisms by which hypoxia modulates miRNAs in retinal neovascularization remain largely elusive. In this study, we first established a direct regulatory link between microRNA-381-3p (miR-381-3p) and hypoxia-inducible factor-1α (HIF-1α) using a dual-luciferase reporter gene assay. Based on an in vitro cellular hypoxia model and an in vivo oxygen-induced retinopathy (OIR) mouse model, we validated the regulatory effect of HIF-1α on miR-381-3p expression. In addition, downregulation of miR-381-3p attenuated retinal neovascularization, inflammation, and apoptosis in OIR mice. Transcriptome sequencing analysis identified Steap4, a differentially expressed gene, as a potential downstream target of miR-381-3p. Further detection suggested that inhibition of miR-381-3p expression could down-regulate the expression of STEAP4 both in vitro and in vivo. Collectively, our study provides compelling evidence that the HIF-1α/miR-381-3p pathway plays a critical regulatory role in retinal neovascularization, which complements the pathogenic mechanisms underlying retinal vascular diseases and suggests that miR-381-3p may serve as a potential therapeutic target for treating retinal neovascularization.
视网膜新生血管是各种视网膜血管疾病的共同病理特征,通常由缺氧引起。在最近的研究中,microRNA (miRNA)介导的信号传导在视网膜新生血管中的调节作用已被广泛研究。然而,尽管已经确定了缺氧诱导的miRNA失调,但缺氧调节视网膜新生血管中miRNA的具体机制仍然难以捉摸。在这项研究中,我们首先通过双荧光素酶报告基因测定,建立了microRNA-381-3p (miR-381-3p)和缺氧诱导因子-1α (HIF-1α)之间的直接调控联系。基于体外细胞缺氧模型和体内氧诱导视网膜病变(OIR)小鼠模型,我们验证了HIF-1α对miR-381-3p表达的调控作用。此外,miR-381-3p的下调可减弱OIR小鼠视网膜新生血管、炎症和细胞凋亡。转录组测序分析发现,差异表达基因Steap4是miR-381-3p的潜在下游靶点。进一步检测发现,抑制miR-381-3p的表达可以下调STEAP4在体外和体内的表达。总之,我们的研究提供了令人信服的证据,证明HIF-1α/miR-381-3p通路在视网膜新生血管中起着关键的调节作用,这补充了视网膜血管疾病的致病机制,并表明miR-381-3p可能作为治疗视网膜新生血管的潜在治疗靶点。
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引用次数: 0
PIKfyve is an essential component of the endolysosomal pathway within photoreceptors and the retinal pigment epithelium PIKfyve是光感受器和视网膜色素上皮内溶酶体途径的重要组成部分。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-03 DOI: 10.1016/j.exer.2026.110905
Karen Attia , Ifrah Anjum , Susanne Lingrell , Chavy Dworkind , Matthew D. Benson , Ian M. MacDonald , Jennifer C. Hocking
Phosphoinositides (PIs) are a family of seven low abundance membrane lipids, each with distinct signaling functions. The phosphoinositide kinase PIKfyve generates phosphoinositide-3,5-bisphosphate (PI(3,5)P2) and PI5P. Emerging evidence implicates PIKfyve in key cellular processes, including autophagy, phagocytosis, endosomal trafficking, lysosomal maintenance, and melanosome formation. Complete loss of PIKfyve function is embryonic lethal in model organisms. In humans, heterozygous mutations in PIKFYVE are associated with Fleck corneal dystrophy and congenital cataracts. In this study, we investigate the role of PIKfyve in photoreceptors and the adjacent retinal pigment epithelium (RPE), host to dynamic endolysosomal pathways required for enduring the high oxidative stress environment, transporting metabolites and phototransduction components, and the breakdown of outer segment discs. To assess PIKfyve function in the retina and RPE in our zebrafish model, we employed CRISPR/Cas9-mediated gene editing and pharmacological inhibition using the specific PIKfyve inhibitor apilimod. Loss of PIKfyve activity leads to RPE expansion characterized by the accumulation of LC3- and LAMP1-positive vacuoles, along with defects in phagosome degradation and minor changes to melanosome biogenesis. Photoreceptors deprived of PIKfyve function develop a single large vacuole in the inner segment, while the OS remains largely intact over the timespan analyzed. Electroretinography (ERG) recordings revealed complete visual impairment in pikfyve crispant larvae and significantly reduced visual function in larvae treated with apilimod post embryogenesis. These findings highlight the critical role of PIKfyve in the development and homeostasis of the RPE and retina.
磷酸肌苷(pi)是一个由7个低丰度膜脂组成的家族,每一个都具有不同的信号功能。磷酸肌苷激酶PIKfyve产生磷酸肌苷-3,5-二磷酸(PI(3,5)P2)和PI5P。新出现的证据表明,PIKfyve参与关键的细胞过程,包括自噬、吞噬、内体运输、溶酶体维持和黑素小体的形成。在模式生物中,完全丧失PIKfyve功能是胚胎致命的。在人类中,PIKFYVE的杂合突变与Fleck角膜营养不良和先天性白内障有关。在这项研究中,我们研究了PIKfyve在光感受器和邻近的视网膜色素上皮(RPE)中的作用,RPE是承受高氧化应激环境所需的动态内溶酶体途径的宿主,运输代谢物和光转导成分,以及外节椎间盘的破坏。为了在我们的斑马鱼模型中评估PIKfyve在视网膜和RPE中的功能,我们使用CRISPR/ cas9介导的基因编辑和特异性PIKfyve抑制剂apilimod的药理抑制。PIKfyve活性的丧失导致RPE扩张,其特征是LC3-和lamp1阳性液泡的积累,以及吞噬体降解缺陷和黑素小体生物发生的微小变化。被剥夺PIKfyve功能的光感受器在内节段形成一个大液泡,而在分析的时间范围内,OS基本保持完整。视网膜电图(ERG)记录显示,pikfyve脆化幼虫完全视力受损,胚胎发生后apilimod处理的幼虫视觉功能显著降低。这些发现强调了PIKfyve在RPE和视网膜的发育和稳态中的关键作用。
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引用次数: 0
Modified Autologous Conditioned Serum (mACS) demonstrates the neuroprotective effect in the Benzalkonium chloride (BAK)-induced murine dry eye model 改良的自体条件血清(mACS)在苯扎氯铵(BAK)诱导的小鼠干眼模型中显示出神经保护作用。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-04 DOI: 10.1016/j.exer.2026.110898
En-Chia Mai , Kuo-Hsuan Hung , Shao-Hsuan Chang , Chun Hsiung , Chung-Chuan Hsiung , Lung-Kun Yeh
The purpose of this study was to analyze and compare cytokine and growth factor levels in modified autologous conditioned serum (mACS) and autologous serum (AS) and to evaluate their therapeutic effects in a benzalkonium chloride (BAK)-induced murine dry eye model. Serum samples were obtained from twenty healthy volunteers and analyzed by ELISA. A dry eye model was established in twenty-four C57BL/6 mice by topical application of 0.2% BAK twice daily for seven days. The mice were evenly divided into three subgroups: saline-treated, 0.5% AS-treated, and 0.5% mACS-treated. The right eyes were treated, and the left eyes served as untreated controls. Eyeballs were harvested on days 7 and 14 for immunofluorescence staining. Results showed that neuroprotective factors (BDNF and fractalkine), pro-inflammatory cytokines (IL-1β, IL-6, MIF, TNF-α), and VEGF-A were significantly elevated in the mACS group, whereas PDGF-BB was significantly reduced. Furthermore, immunofluorescence analysis demonstrated a significantly greater recovery of central corneal nerve fibers in the mACS-treated group compared with the saline group at day 7 (p < 0.01).
At day 14, the mACS-treated group continued to show a trend toward increased central corneal nerve regeneration, although this difference did not reach conventional statistical significance (p < 0.1). No significant differences were observed between the AS- and saline-treated groups. In conclusion, compared with AS, mACS demonstrates a cytokine profile suggestive of enhanced neuroprotective potential and may facilitate corneal nerve regeneration in the BAK-induced murine dry eye model.
本研究的目的是分析和比较改良的自体条件血清(mACS)和自体血清(AS)的细胞因子和生长因子水平,并评价它们在苯扎氯铵(BAK)诱导的小鼠干眼模型中的治疗作用。采集20名健康志愿者血清,采用ELISA法进行分析。以24只C57BL/6小鼠为实验对象,每日2次外用0.2% BAK,连续7 d建立干眼模型。将小鼠平均分为三个亚组:盐水组、0.5% as组和0.5% macs组。右眼接受治疗,左眼作为未治疗的对照组。第7天和第14天取眼球进行免疫荧光染色。结果显示,mACS组神经保护因子(BDNF和fractalkine)、促炎因子(IL-1β、IL-6、MIF、TNF-α)和VEGF-A显著升高,PDGF-BB显著降低。此外,免疫荧光分析显示,与生理盐水组相比,macs治疗组在第7天角膜中央神经纤维的恢复明显更大(p < 0.01)。在第14天,macs治疗组继续表现出角膜中央神经再生增加的趋势,尽管这种差异没有达到常规统计学意义(p < 0.1)。AS-和盐处理组之间无显著差异。综上所述,与AS相比,mACS显示出增强神经保护潜能的细胞因子谱,并可能促进bac诱导的小鼠干眼模型的角膜神经再生。
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引用次数: 0
Decreased corneal biomechanical stability and structural integrity in PPAR-α knockout mice PPAR-α敲除小鼠角膜生物力学稳定性和结构完整性降低。
IF 2.7 2区 医学 Q1 OPHTHALMOLOGY Pub Date : 2026-05-01 Epub Date: 2026-02-09 DOI: 10.1016/j.exer.2026.110911
Chengfang Zhu , Huan He , Hongwei Yan , Aolin Liu , Minghui Liang , Rongrong Zong , Bin Liu , Xiuxian Qin , Juan Yang , Zhirong Lin
Recent evidence indicates that inflammatory cytokines and proteolytic enzymes play a vital role in the development of biomechanical failure in the cornea. Previous studies have shown that inflammatory cascades could be inhibited by peroxisome proliferator-activated receptor-α activation. This study seeks to investigate the biomechanical and structural features of the cornea in PPAR-α−/− mice and to assess alterations in inflammatory cytokines and enzymes. Adult PPAR-α−/− mice and wild-type C57BL/6 mice (WT) were used in this study. The corneas were excised and evaluated by modulus of elasticity test, enzymatic tissue digestion assay, corneal fluorescein sodium staining, tear film break-up time (tBUT), anterior segment OCT, in vivo corneal confocal microscopy (IVCM), transmission electron microscopy (TEM), and quantitative real-time PCR (RT-PCR). Decreased tBUT and SIt values were observed, while no corneal lesions were observed in the PPAR-α−/− mice. The corneal tangent modulus at fracture and resistance to enzymatic hydrolysis in PPAR-α−/− mice were significantly decreased (P = 0.005 and P < 0.001, respectively). Anterior segment OCT showed that the corneas of PPAR-α−/− mice were significantly thinner than in the WT (P = 0.008). IVCM showed that the corneal nerve fibers of PPAR-α−/− mice were slender, and the hypo-reflective folds of the stromal layer were more apparent, while the stromal fibers of the WT were thicker. TEM showed that the lamellar stromal fibers were interlaced and disorganized with decreased fiber density in PPAR-α−/− mice compared with the WT. The expression of F-actin, lumican, laminin, TGF-β, TIMP-1, and TIMP-3 in the cornea of PPAR-α−/− mice was also decreased, accompanied by an increase of TNF-α and MMP-9. In conclusion, the corneal biomechanical stability and microstructural integrity of PPAR-α−/− mice were decreased, which might be associated with dysregulation of corneal structure-related components, inflammation-related factors, and proteases.
最近的证据表明,炎症细胞因子和蛋白水解酶在角膜生物力学衰竭的发展中起着至关重要的作用。先前的研究表明,炎症级联反应可以通过激活过氧化物酶体增殖物激活受体-α来抑制。本研究旨在研究PPAR-α-/-小鼠角膜的生物力学和结构特征,并评估炎症细胞因子和酶的变化。本研究采用成年PPAR-α-/-小鼠和野生型C57BL/6小鼠(WT)。切除角膜,通过弹性模量试验、组织酶消化试验、角膜荧光素钠染色、泪膜破裂时间(tBUT)、前段OCT、活体角膜共聚焦显微镜(IVCM)、透射电子显微镜(TEM)和实时荧光定量PCR (RT-PCR)进行评估。在PPAR-α-/-小鼠中,观察到but和SIt值降低,但未观察到角膜病变。PPAR-α-/-小鼠骨折时角膜切线模量和抗酶水解能力显著降低(P=0.005), P-/-小鼠比WT组明显变薄(P=0.008)。IVCM显示PPAR-α-/-小鼠角膜神经纤维较细,间质层低反射褶皱较明显,而WT间质纤维较粗。透射电镜显示,与WT相比,PPAR-α-/-小鼠角膜板层间质纤维呈交错排列,纤维密度降低,F-actin、lumican、层粘连蛋白、TGF-β、TIMP-1、TIMP-3表达降低,TNF-α、MMP-9表达升高。综上所述,PPAR-α-/-小鼠角膜生物力学稳定性和微观结构完整性下降,可能与角膜结构相关成分、炎症相关因子和蛋白酶的失调有关。
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Experimental eye research
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