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Re: Significant errors in the paper by Ballesteros-Sánchez A, Rocha-de-Lossada C and Sánchez-González J. Efficacy of eyelid warming devices as first-step treatment in meibomian gland dysfunction: A systematic review with meta-analysis. 2025; 37:33–46 回复:Ballesteros-Sánchez A、Rocha-de-Lossada C和Sánchez-González j的论文存在显著错误。眼睑温热装置作为睑板腺功能障碍第一步治疗的疗效:一项meta分析的系统综述。2025年;37:33-46
IF 5.6 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-04-11 DOI: 10.1016/j.jtos.2025.04.003
Jacqueline Tan
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引用次数: 0
Transcriptional landscape of aniridia-associated keratopathy through single-cell RNA sequencing 通过单细胞RNA测序研究无虹膜相关性角膜病变的转录景观
IF 5.9 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-06-03 DOI: 10.1016/j.jtos.2025.05.008
Masahito Yoshihara , Rei Kamuro , Susumu Hara , Nozomi Nishida , Koji Ohmoto , Yuzuru Sasamoto , Satoshi Kawasaki , Yoshinori Oie , Kohji Nishida

Purpose

Aniridia-associated keratopathy (AAK) is a progressive condition characterized by conjunctivalization of the cornea, yet its molecular mechanisms remain largely unknown. This study aims to elucidate the transcriptional landscape of AAK by characterizing the gene expression profiles of corneal epithelial cells in a patient with congenital aniridia.

Methods

Single-cell RNA sequencing (scRNA-seq) was performed on epithelial tissues collected from the clear central corneal region and limbus of a 48-year-old female patient with congenital aniridia. The transcriptomic profiles were compared with those of healthy control samples.

Results

scRNA-seq analysis revealed that a subpopulation of cells from the clear central corneal region expressed the cornea-specific keratins KRT3 and KRT12 despite a significant reduction in PAX6 expression. These cells exhibited corneal, conjunctival, or mixed gene signatures. Genes associated with wound healing and apoptosis were upregulated in the cornea-like cells from the aniridic cornea, indicating a chronic wound healing state. Elevated KLF4 expression and regulon activity were observed in these cornea-like cells. Most limbal epithelial cells exhibited conjunctiva-like characteristics, reflecting a loss of limbal cell identity.

Conclusion

While acknowledging the limitations of a single case study, this study provides deeper insights into the transcriptional signatures associated with AAK using scRNA-seq. We identified transcriptional alterations reflecting AAK progression and highlighted potential transcription factors that may contribute to corneal identity maintenance despite PAX6 deficiency. These findings enhance our understanding of AAK and suggest potential therapeutic strategies to slow its progression.
目的无虹膜相关性角膜病变(AAK)是一种以角膜结膜炎为特征的进行性疾病,其分子机制在很大程度上仍不清楚。本研究旨在通过表征先天性无虹膜患者角膜上皮细胞的基因表达谱来阐明AAK的转录景观。方法对48岁女性先天性无虹膜患者角膜中央透明区及角膜缘上皮组织进行单细胞RNA测序(scRNA-seq)。将转录组谱与健康对照样本进行比较。结果scrna -seq分析显示,尽管PAX6表达显著降低,但来自角膜中央区域的一个细胞亚群表达了角膜特异性角蛋白KRT3和KRT12。这些细胞表现出角膜、结膜或混合基因特征。无角膜样角膜细胞中与伤口愈合和凋亡相关的基因上调,表明伤口愈合处于慢性状态。在这些角膜样细胞中观察到KLF4表达和调控蛋白活性升高。大多数角膜缘上皮细胞表现出结膜样特征,反映了角膜缘细胞身份的丧失。虽然承认单个案例研究的局限性,但本研究使用scRNA-seq对与AAK相关的转录特征提供了更深入的了解。我们发现了反映AAK进展的转录改变,并强调了尽管PAX6缺乏,但可能有助于角膜身份维持的潜在转录因子。这些发现增强了我们对AAK的理解,并提出了减缓其进展的潜在治疗策略。
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引用次数: 0
A pilot randomized controlled trial of topical androgen treatment in dry eye 局部雄激素治疗干眼症的随机对照试验
IF 5.9 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-06-14 DOI: 10.1016/j.jtos.2025.06.002
Jay Ruzhang Jiang , Rima Khankan , William H. Ridder III , Andrew Loc Nguyen , Jerry R. Paugh

Purpose

To evaluate the safety and efficacy of eyelid androgen gel application to treat moderate to severe dry eye disease.

Methods

Twenty four eyes of 24 subjects (12 eyes per arm) were randomized to either eyelid testosterone or vehicle gel. Subjects received either 17β-Hydroxyandrost-4-en-3-one) 4.5 % wt./wt. or vehicle gel, applied twice daily 12 h apart for 4 weeks. Outcome parameters were monitored at 2-, and 4-weeks during dosing, and at 4-, and 8-weeks following dosing cessation.

Results

Significant positive differences were found in the androgen arm only, for Schein symptom score, tear meniscus height (TMH), fluorescein tear breakup time (fTBUT) and meibum score (repeated ANOVA, all p = 0.046 or less for each arm comparison) at all follow-up visits compared to baseline. For example, fTBUT in the androgen arm at 4 weeks was 6.2 ± 1.5 s compared to baseline, 3.3 ± 0.9 secs p< 0.001 (Dunnett's test, 95 % CI [1.838, 3.829]). No change was observed for either arm for staining, tear osmolarity, OSDI, non-invasive breakup time (NIBUT), serum lipid levels or hematocrit. Serum testosterone increased ∼ 9-fold in females (paired t-test; p = 0.006; CI [-240.2, −55.6]) in the androgen arm, but not males (paired t-test; p = 0.727; CI [-25.9, 31.2]).

Conclusions

Eyelid androgen gel application, 4.5 % wt./wt., was effective in improving tear fTBUT, symptoms, TMH and meibomian secretion grade in dry eye patients. Future research requires a larger sample size, outcome measure variability reduction and formulation optimization for absorption, androgen type, and dosing regimen.
目的评价眼睑雄激素凝胶治疗中重度干眼病的安全性和有效性。
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引用次数: 0
Pediatric vs adult Stevens Johnson syndrome/toxic epidermal necrolysis: Ocular outcomes and the role of amniotic membrane 儿童vs成人史蒂文斯约翰逊综合征/中毒性表皮坏死松解:眼部结局和羊膜的作用
IF 5.6 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-10-31 DOI: 10.1016/j.jtos.2025.10.008
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引用次数: 0
Corneal sensory nerve regulation of tear production through stimulation of transient receptor potential melastatin 8 (TRPM8) channel: A potential new approach for treating dry eye disease 角膜感觉神经通过刺激瞬时受体电位美拉他汀8 (TRPM8)通道调节泪液产生:一种治疗干眼病的潜在新方法
IF 5.9 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-07-18 DOI: 10.1016/j.jtos.2025.07.003
Juana Gallar , Stephen Pflugfelder , Anat Galor , Preeya K. Gupta , Pedram Hamrah
The lacrimal functional unit (LFU) tightly controls the secretion of all tear components, thus playing a critical role in maintaining ocular surface homeostasis. Forming an exquisitely sensitive neural network across the ocular surface, corneal sensory nerves detect environmental stimuli (e.g., temperature, chemicals, and mechanical pressure) through transient receptor potential (TRP) ion channels. Among these, TRP melastatin 8 (TRPM8) is a key regulator of basal tear production. Stimulated by the small temperature reductions and tear film osmolarity increases that arise due to evaporative cooling, TRPM8 activates the LFU, leading to increased basal tear production.
Here, we focus on reviewing the topical ocular pathways within the LFU that regulate tear production. We describe the neural signaling underlying this regulation, with a focus on TRP channels and the central role of TRPM8 in basal tear production as elucidated through preclinical as well as limited clinical evidence. Lastly, we explore how augmenting the fundamental action of TRPM8 signaling through agonist stimulation may serve as a valuable new treatment option for dry eye disease.
泪功能单位(LFU)严格控制所有泪液成分的分泌,因此在维持眼表稳态中起关键作用。角膜感觉神经通过瞬时受体电位(TRP)离子通道,在眼表面形成一个非常敏感的神经网络,检测环境刺激(如温度、化学物质和机械压力)。其中,TRP美拉抑素8 (TRPM8)是基础泪液产生的关键调节因子。在蒸发冷却引起的温度降低和泪膜渗透压增加的刺激下,TRPM8激活LFU,导致基础泪液产量增加。
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引用次数: 0
Early myeloid cell infiltration and subset-specific macrophage responses in murine corneal nerve injury 小鼠角膜神经损伤的早期髓样细胞浸润和亚群特异性巨噬细胞反应
IF 5.9 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-07-10 DOI: 10.1016/j.jtos.2025.07.001
Seung Hyeun Lee , Soo Jin Lee , Ahra Koh , Yunjin Lee , Seonghan Kim , Suil Jeon , Noseong Park , Chang Ho Yoon , Ki Hean Kim , Kyoung Woo Kim

Purpose

Corneal nerve fibers and resident macrophages form a specialized microenvironment essential for tissue integrity and recovery after injury. This study aims to elucidate the early immune dynamics following corneal nerve injury, focusing on myeloid cell infiltration and resident macrophage subset shifts.

Methods

Using a murine circular nerve-cut model, we tracked immune responses for 21 days, with a focus on the first 12 h post-injury. Confocal imaging was used to assess corneal nerve density, while flow cytometry quantified infiltrating and resident immune cell populations. Transcriptomic profiling was performed at 3 and 6 h post-injury to analyze inflammatory gene expression, and in vitro experiments examined the effects of short-term nerve growth factor (NGF) exposure on macrophage polarization.

Results

Confocal imaging showed a rapid decrease in corneal nerve density, followed by progressive regeneration. Flow cytometry revealed a surge in Ly6C+ myeloid cells at 3–6 h post-injury, predominantly in the central cornea, with an early tendency toward M2-like polarization. Resident macrophages exhibited distinct responses: M2-like and undifferentiated subsets declined, while M1-like cells were proportionally maintained, indicating divergent but complementary roles during the initial inflammatory phase. Transcriptomic profiling showed significant upregulation of inflammatory genes along with a transient increase in Ngf and compensatory anti-inflammatory signaling. In vitro, short-term NGF exposure enhanced both M1-and M2-like polarization, mirroring in vivo activation patterns.

Conclusion

Early myeloid cell infiltration and macrophage subset dynamics contribute to the initial neuroinflammatory response and may influence subsequent repair processes, highlighting the potential for immune modulation in corneal nerve regeneration.
角膜神经纤维和常驻巨噬细胞形成了一个特殊的微环境,对损伤后组织的完整性和恢复至关重要。本研究旨在阐明角膜神经损伤后的早期免疫动力学,重点关注骨髓细胞浸润和常驻巨噬细胞亚群转移。
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引用次数: 0
Response to letter to the editor regarding “Simple limbal epithelial transplantation versus cultivated limbal epithelial transplantation in ocular burns” 回复关于“单纯角膜缘上皮移植与培养角膜缘上皮移植治疗眼部烧伤”的致编辑的信。
IF 5.6 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-07-31 DOI: 10.1016/j.jtos.2025.07.007
Namrata Sharma, Renu Venugopal, Sujata Mohanty, Kamalakannan Priyadarshini, Ritu Nagpal, Deepali Singhal, Aafreen Bari, Tanuj Dada, Prafulla Kumar Maharana, Tushar Agarwal, Ashish Dutt Upadhyay
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引用次数: 0
Topical pharmacologic treatments for dry eye disease: A systematic review 干眼病的局部药物治疗:系统综述。
IF 5.6 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-07-30 DOI: 10.1016/j.jtos.2025.07.010
Louis Tong , Zuguo Liu , Afsun Şahin , Koray Gümüş , Elisabeth M. Messmer , José M. Benítez-del-Castillo , Marc Labetoulle , Clara C. Chan , Laura M. Periman

Background

Topical pharmacologic treatments for dry eye disease (DED) address different aspects of tear film deficiency by decreasing ocular surface inflammation, stimulating mucin secretion, increasing tear production, or reducing excessive evaporation. This systematic review evaluated randomized controlled trials (RCTs) and prospective observational studies of topical ophthalmic medications for DED.

Methods

PubMed and Embase were searched from 1980 to February 2024. For studies meeting inclusion criteria, efficacy outcomes (signs and symptoms of DED) and adverse event data were extracted.

Results

A total of 107 publications covering topical prescription medications (anti-inflammatory agents cyclosporine and lifitegrast; mucin secretagogues diquafosol and rebamipide; tear evaporation inhibitor perfluorohexyloctane; tear production stimulator nasal spray varenicline), other commercially available products, and novel agents in development were identified. In RCTs, significant improvements relative to a control group were demonstrated more often for sign endpoints (e.g., corneal staining, Schirmer score) than for symptom endpoints (e.g., eye dryness, ocular discomfort). The evaluated treatments were well tolerated; instillation site reactions were the most commonly reported adverse events. Year-long safety extension studies demonstrated maintenance of efficacy, with no new safety signals identified. Studies differed in design, methodology, control group, and outcomes assessment, making it difficult to compare across products, and head-to-head studies were rare. Several new products are in late-stage development, which will likely lead to additional treatment options.

Conclusions

Current topical pharmacologic eye products improved signs, and sometimes symptoms, of DED and were well tolerated. Treatment selection should use a shared decision-making approach that takes DED etiology and patient preferences into account.
背景:干眼病(DED)的局部药物治疗通过减少眼表炎症、刺激黏液分泌、增加泪液产生或减少过度蒸发来解决泪膜缺乏的不同方面。本系统综述评价了局部眼科药物治疗DED的随机对照试验(rct)和前瞻性观察性研究。方法:检索1980 ~ 2024年2月PubMed和Embase数据库。对于符合纳入标准的研究,提取疗效结局(DED的体征和症状)和不良事件数据。结果:共有107篇出版物涵盖了外用处方药(抗炎药环孢素和利替格司;粘蛋白分泌剂:双喹福醇和利巴米胺;撕裂蒸发抑制剂全氟己辛烷;确定了泪液产生刺激剂(varenicline鼻喷雾剂),其他市售产品和正在开发的新型药物。在随机对照试验中,与对照组相比,体征终点(如角膜染色、Schirmer评分)比症状终点(如眼睛干燥、眼部不适)更常表现出显著的改善。经评估的治疗方法耐受性良好;注射部位反应是最常见的不良事件。为期一年的安全性扩展研究表明,该药物维持了疗效,未发现新的安全信号。研究在设计、方法、对照组和结果评估方面存在差异,这使得很难对不同产品进行比较,而且针锋相对的研究很少。一些新产品正处于后期开发阶段,这可能会带来更多的治疗选择。结论:目前的局部药物眼科产品改善了DED的体征,有时是症状,并且耐受性良好。治疗选择应采用共同决策的方法,将DED病因和患者偏好考虑在内。
{"title":"Topical pharmacologic treatments for dry eye disease: A systematic review","authors":"Louis Tong ,&nbsp;Zuguo Liu ,&nbsp;Afsun Şahin ,&nbsp;Koray Gümüş ,&nbsp;Elisabeth M. Messmer ,&nbsp;José M. Benítez-del-Castillo ,&nbsp;Marc Labetoulle ,&nbsp;Clara C. Chan ,&nbsp;Laura M. Periman","doi":"10.1016/j.jtos.2025.07.010","DOIUrl":"10.1016/j.jtos.2025.07.010","url":null,"abstract":"<div><h3>Background</h3><div>Topical pharmacologic treatments for dry eye disease (DED) address different aspects of tear film deficiency by decreasing ocular surface inflammation, stimulating mucin secretion, increasing tear production, or reducing excessive evaporation. This systematic review evaluated randomized controlled trials (RCTs) and prospective observational studies of topical ophthalmic medications for DED.</div></div><div><h3>Methods</h3><div>PubMed and Embase were searched from 1980 to February 2024. For studies meeting inclusion criteria, efficacy outcomes (signs and symptoms of DED) and adverse event data were extracted.</div></div><div><h3>Results</h3><div>A total of 107 publications covering topical prescription medications (anti-inflammatory agents cyclosporine and lifitegrast; mucin secretagogues diquafosol and rebamipide; tear evaporation inhibitor perfluorohexyloctane; tear production stimulator nasal spray varenicline), other commercially available products, and novel agents in development were identified. In RCTs, significant improvements relative to a control group were demonstrated more often for sign endpoints (e.g., corneal staining, Schirmer score) than for symptom endpoints (e.g., eye dryness, ocular discomfort). The evaluated treatments were well tolerated; instillation site reactions were the most commonly reported adverse events. Year-long safety extension studies demonstrated maintenance of efficacy, with no new safety signals identified. Studies differed in design, methodology, control group, and outcomes assessment, making it difficult to compare across products, and head-to-head studies were rare. Several new products are in late-stage development, which will likely lead to additional treatment options.</div></div><div><h3>Conclusions</h3><div>Current topical pharmacologic eye products improved signs, and sometimes symptoms, of DED and were well tolerated. Treatment selection should use a shared decision-making approach that takes DED etiology and patient preferences into account.</div></div>","PeriodicalId":54691,"journal":{"name":"Ocular Surface","volume":"38 ","pages":"Pages 302-317"},"PeriodicalIF":5.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144765938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Ultrasonography assessments of meibomian gland as a noninvasive method of detecting changes in morphology 超声评估睑板腺作为一种无创检测形态学变化的方法
IF 5.9 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-06-20 DOI: 10.1016/j.jtos.2025.06.006
Liyun Wang , Hongbo Yin , Yujia Yang , Li Qiu

Purpose

We employed 24 MHz ultrasonography to evaluate the morphological features of meibomian glands (MGs) and compared the ultrasonic differences in morphology between healthy volunteers and meibomian gland dysfunction (MGD) patients.

Methods

24 MHz ultrasound examinations on both the upper and lower eyelids of healthy volunteers and patients with MGD, using transverse and longitudinal sections. The reproducibility of ultrasonographic findings for the MG was evaluated, and a comparison of morphological characteristics at different examination sites between the two groups was made.

Results

Among 89 participants, 24 were healthy volunteers and 65 had MGD. The cross-sectional ultrasound findings showed well-organized punctate hyperechoic ducts within the tarsal plate, surrounded by hypoechoic acinar formations, which were further classified based on the extent of MG involvement into three categories: normal, ≤50 % involvement, and >50 % involvement. Additionally, a typical longitudinal ultrasound appearance of a MG consisted of a thin band-like hypoechoic structure (acinar) with uniform thickness accompanied by an arc-shaped linear hyperechoic duct in its middle region. Furthermore, seven abnormal longitudinal ultrasound manifestations were categorized as distortion, ectasia, central duct truncation, cyst formation, structureless appearance, complete disappearance or other findings. The intra- and inter-observer agreement for those categories was found to be high (ICC>0.6). MGD patients exhibited a higher likelihood of overall MG involvement or abnormal ultrasound findings, particularly in relation to the middle part of the upper eyelid.

Conclusion

The present study has developed an initial classification method to identify abnormalities in MG morphology using 24 MHz ultrasound in MGD patients.
采用24 MHz超声对睑板腺(mg)的形态学特征进行了评价,并比较了健康志愿者与睑板腺功能障碍(MGD)患者的超声形态学差异。
{"title":"Ultrasonography assessments of meibomian gland as a noninvasive method of detecting changes in morphology","authors":"Liyun Wang ,&nbsp;Hongbo Yin ,&nbsp;Yujia Yang ,&nbsp;Li Qiu","doi":"10.1016/j.jtos.2025.06.006","DOIUrl":"10.1016/j.jtos.2025.06.006","url":null,"abstract":"<div><h3>Purpose</h3><div>We employed 24 MHz ultrasonography to evaluate the morphological features of meibomian glands (MGs) and compared the ultrasonic differences in morphology between healthy volunteers and meibomian gland dysfunction (MGD) patients.</div></div><div><h3>Methods</h3><div>24 MHz ultrasound examinations on both the upper and lower eyelids of healthy volunteers and patients with MGD, using transverse and longitudinal sections. The reproducibility of ultrasonographic findings for the MG was evaluated, and a comparison of morphological characteristics at different examination sites between the two groups was made.</div></div><div><h3>Results</h3><div>Among 89 participants, 24 were healthy volunteers and 65 had MGD. The cross-sectional ultrasound findings showed well-organized punctate hyperechoic ducts within the tarsal plate, surrounded by hypoechoic acinar formations, which were further classified based on the extent of MG involvement into three categories: normal, ≤50 % involvement, and &gt;50 % involvement. Additionally, a typical longitudinal ultrasound appearance of a MG consisted of a thin band-like hypoechoic structure (acinar) with uniform thickness accompanied by an arc-shaped linear hyperechoic duct in its middle region. Furthermore, seven abnormal longitudinal ultrasound manifestations were categorized as distortion, ectasia, central duct truncation, cyst formation, structureless appearance, complete disappearance or other findings. The intra- and inter-observer agreement for those categories was found to be high (ICC&gt;0.6). MGD patients exhibited a higher likelihood of overall MG involvement or abnormal ultrasound findings, particularly in relation to the middle part of the upper eyelid.</div></div><div><h3>Conclusion</h3><div>The present study has developed an initial classification method to identify abnormalities in MG morphology using 24 MHz ultrasound in MGD patients.</div></div>","PeriodicalId":54691,"journal":{"name":"Ocular Surface","volume":"38 ","pages":"Pages 72-79"},"PeriodicalIF":5.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Phenotypic and genotypic profiling of antimicrobial resistance genes and virulence factors in Pseudomonas aeruginosa isolates from keratitis patients 角膜炎患者铜绿假单胞菌耐药基因和毒力因子的表型和基因型分析
IF 5.6 1区 医学 Q1 OPHTHALMOLOGY Pub Date : 2025-10-01 Epub Date: 2025-10-30 DOI: 10.1016/j.jtos.2025.10.011
Abiye Tigabu , Mark D.P. Willcox , Fiona Stapleton
<div><h3>Background</h3><div><em>Pseudomonas aeruginosa</em> (<em>P. aeruginosa</em>) is a major cause of ocular infections, exhibiting resistance to many antimicrobial agents and the ability to acquire further resistance through mutations and horizontal gene transfer. It employs a range of virulence factors to invade ocular tissues, leading to complications such as corneal scarring and perforation. Alarmingly, multidrug-resistant <em>P. aeruginosa</em> isolates are increasing worldwide. For instance, a recent outbreak in the United States of America (USA) involving an extensively drug-resistant <em>P. aeruginosa</em> PA1270 strain resulted in four deaths, four eye removals, and 14 cases of vision loss. A comprehensive understanding of the antibiotic resistance and virulence mechanisms of <em>P. aeruginosa</em> is essential for the effective management of corneal infections.</div></div><div><h3>Methods</h3><div>Whole-genome sequencing data from 70 <em>P. aeruginosa</em> isolates collected from corneal samples were retrieved from the National Center for Biotechnology Information (NCBI) database and annotated using Prokka 1.14.6. Unique genes identified in these datasets were analyzed against the Comprehensive Antibiotic Resistance Database (CARD) to determine antimicrobial resistance profiles. The presence of acquired resistance genes and virulence factors were assessed using ResFinder and the Virulence Factor Database (VFDB), respectively. Roary v3.13.0 was used for pangenome analysis, while Snippy v4.6.0 was employed for whole-genome variant analysis. Furthermore, mobile genetic elements (MGEs) and pathogenicity islands (PIs) were identified using MobileElementFinder v1.0.3 and IslandViewer 4, respectively. In parallel, phenotypic characterization, including determination of minimum inhibitory concentrations (MICs) for selected antimicrobial agents, was performed using the broth microdilution method. Additionally, a crystal violet assay was conducted to evaluate the biofilm-forming ability of <em>P. aeruginosa</em>.</div></div><div><h3>Results</h3><div>The corneal <em>P. aeruginosa</em> harboured numerous AMR genes against various classes of antibiotics. Notably, the most prevalent acquired resistance genes across all keratitis <em>P. aeruginosa</em> strains were β-lactams <em>blaPAO</em>, and <em>blaOXA</em>, aminoglycoside <em>aph(3′)-IIb</em>, chloramphenicol <em>catB7</em>, and fosfomycin <em>fosA</em>. <em>P. aeruginosa</em> keratitis isolates harbored more core and cloud genes than environmental and cystic fibrosis (CF) strains. A significant difference in ciprofloxacin resistance gene <em>crpP</em> was observed between the keratitis and CF isolates. Additionally, a considerable number of insertion sequences (ISPa1, ISPa6, ISPa32) and transposons (Tn4661, Tn6082, Tn5563) were identified. Phenotypic characterization of antimicrobial resistance (AMR) revealed that gentamicin were the most effective antibiotics against corneal <em>P. aerugino
铜绿假单胞菌(P. aeruginosa)是眼部感染的主要原因,表现出对许多抗微生物药物的耐药性,并能够通过突变和水平基因转移获得进一步的耐药性。它利用一系列毒力因子侵入眼部组织,导致角膜瘢痕和穿孔等并发症。令人震惊的是,耐多药铜绿假单胞菌分离株在世界范围内正在增加。例如,最近在美利坚合众国(美国)爆发了一种广泛耐药的铜绿假单胞菌PA1270菌株,造成4人死亡、4人摘除眼睛和14例视力丧失。全面了解铜绿假单胞菌的抗生素耐药性和毒力机制对于有效管理角膜感染至关重要。方法从美国国家生物技术信息中心(National Center for Biotechnology Information, NCBI)数据库中检索70株铜绿假单胞菌的全基因组测序数据,并使用Prokka 1.14.6进行注释。在这些数据集中鉴定的独特基因与综合抗生素耐药性数据库(CARD)进行分析,以确定抗菌素耐药性谱。分别使用ResFinder和毒力因子数据库(VFDB)评估获得性耐药基因和毒力因子的存在。采用Roary v3.13.0进行全基因组分析,采用Snippy v4.6.0进行全基因组变异分析。此外,利用MobileElementFinder v1.0.3和IslandViewer 4分别鉴定了移动遗传元件(MGEs)和致病岛(pi)。同时,使用肉汤微量稀释法进行表型表征,包括测定所选抗菌药物的最低抑制浓度(mic)。另外,采用结晶紫法对铜绿假单胞菌的生物膜形成能力进行了评价。结果角膜铜绿假单胞菌含有大量抗多种抗生素的AMR基因。值得注意的是,所有铜绿假单胞菌菌株中最常见的获得性耐药基因是β-内酰胺blaPAO和blaOXA、氨基糖苷葡萄球菌(3′)-IIb、氯霉素catB7和磷霉素fosA。铜绿假单胞菌角膜炎分离株比环境性和囊性纤维化(CF)菌株含有更多的核心和云基因。角膜炎与CF分离株环丙沙星耐药基因crpP差异有统计学意义。此外,还鉴定出相当数量的插入序列(ISPa1、ISPa6、ISPa32)和转座子(Tn4661、Tn6082、Tn5563)。结果表明,庆大霉素是抗角膜铜绿假单胞菌最有效的抗生素。68.9%的菌株对亚胺培南有耐药性。令人惊讶的是,26.7%的铜绿假单胞菌菌株被归类为耐多药,它们全部来自印度。此外,61.8%的角膜铜绿假单胞菌分离株是强生物膜产生者,所有耐多药菌株都被鉴定为强生物膜形成者。结论基因型分析揭示了主要的耐药机制,包括抗生素外排、失活和靶点改变,以及多种结构和分泌的毒力因子。虽然在铜绿假单胞菌角膜炎分离株中发现了耐多药和广泛耐药(XDR)菌株,但本研究中的大多数分离株对庆大霉素敏感。这些发现为制定有针对性的治疗策略提供了有价值的见解,当与抗生素联合使用时,可能会改善治疗结果并有助于减轻耐药性的出现。
{"title":"Phenotypic and genotypic profiling of antimicrobial resistance genes and virulence factors in Pseudomonas aeruginosa isolates from keratitis patients","authors":"Abiye Tigabu ,&nbsp;Mark D.P. Willcox ,&nbsp;Fiona Stapleton","doi":"10.1016/j.jtos.2025.10.011","DOIUrl":"10.1016/j.jtos.2025.10.011","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Background&lt;/h3&gt;&lt;div&gt;&lt;em&gt;Pseudomonas aeruginosa&lt;/em&gt; (&lt;em&gt;P. aeruginosa&lt;/em&gt;) is a major cause of ocular infections, exhibiting resistance to many antimicrobial agents and the ability to acquire further resistance through mutations and horizontal gene transfer. It employs a range of virulence factors to invade ocular tissues, leading to complications such as corneal scarring and perforation. Alarmingly, multidrug-resistant &lt;em&gt;P. aeruginosa&lt;/em&gt; isolates are increasing worldwide. For instance, a recent outbreak in the United States of America (USA) involving an extensively drug-resistant &lt;em&gt;P. aeruginosa&lt;/em&gt; PA1270 strain resulted in four deaths, four eye removals, and 14 cases of vision loss. A comprehensive understanding of the antibiotic resistance and virulence mechanisms of &lt;em&gt;P. aeruginosa&lt;/em&gt; is essential for the effective management of corneal infections.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Methods&lt;/h3&gt;&lt;div&gt;Whole-genome sequencing data from 70 &lt;em&gt;P. aeruginosa&lt;/em&gt; isolates collected from corneal samples were retrieved from the National Center for Biotechnology Information (NCBI) database and annotated using Prokka 1.14.6. Unique genes identified in these datasets were analyzed against the Comprehensive Antibiotic Resistance Database (CARD) to determine antimicrobial resistance profiles. The presence of acquired resistance genes and virulence factors were assessed using ResFinder and the Virulence Factor Database (VFDB), respectively. Roary v3.13.0 was used for pangenome analysis, while Snippy v4.6.0 was employed for whole-genome variant analysis. Furthermore, mobile genetic elements (MGEs) and pathogenicity islands (PIs) were identified using MobileElementFinder v1.0.3 and IslandViewer 4, respectively. In parallel, phenotypic characterization, including determination of minimum inhibitory concentrations (MICs) for selected antimicrobial agents, was performed using the broth microdilution method. Additionally, a crystal violet assay was conducted to evaluate the biofilm-forming ability of &lt;em&gt;P. aeruginosa&lt;/em&gt;.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Results&lt;/h3&gt;&lt;div&gt;The corneal &lt;em&gt;P. aeruginosa&lt;/em&gt; harboured numerous AMR genes against various classes of antibiotics. Notably, the most prevalent acquired resistance genes across all keratitis &lt;em&gt;P. aeruginosa&lt;/em&gt; strains were β-lactams &lt;em&gt;blaPAO&lt;/em&gt;, and &lt;em&gt;blaOXA&lt;/em&gt;, aminoglycoside &lt;em&gt;aph(3′)-IIb&lt;/em&gt;, chloramphenicol &lt;em&gt;catB7&lt;/em&gt;, and fosfomycin &lt;em&gt;fosA&lt;/em&gt;. &lt;em&gt;P. aeruginosa&lt;/em&gt; keratitis isolates harbored more core and cloud genes than environmental and cystic fibrosis (CF) strains. A significant difference in ciprofloxacin resistance gene &lt;em&gt;crpP&lt;/em&gt; was observed between the keratitis and CF isolates. Additionally, a considerable number of insertion sequences (ISPa1, ISPa6, ISPa32) and transposons (Tn4661, Tn6082, Tn5563) were identified. Phenotypic characterization of antimicrobial resistance (AMR) revealed that gentamicin were the most effective antibiotics against corneal &lt;em&gt;P. aerugino","PeriodicalId":54691,"journal":{"name":"Ocular Surface","volume":"38 ","pages":"Pages 392-420"},"PeriodicalIF":5.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145405030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
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Ocular Surface
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