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Allam VSRR, Patel VK, De Rubis G, Paudel KR, Gupta G, Chellappan DK, Singh SK, Hansbro PM, Oliver BGG, Dua K. Exploring the role of the ocular surface in the lung-eye axis: Insights into respiratory disease pathogenesis. Life Sci 2024; 349:122730. [PMID: 38768774 DOI: 10.1016/j.lfs.2024.122730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 05/14/2024] [Accepted: 05/15/2024] [Indexed: 05/22/2024]
Abstract
Chronic respiratory diseases (CRDs) represent a significant proportion of global health burden, with a wide spectrum of varying, heterogenic conditions largely affecting the pulmonary system. Recent advances in immunology and respiratory biology have highlighted the systemic impact of these diseases, notably through the elucidation of the lung-eye axis. The current review focusses on understanding the pivotal role of the lung-eye axis in the pathogenesis and progression of chronic respiratory infections and diseases. Existing literature published on the immunological crosstalk between the eye and the lung has been reviewed. The various roles of the ocular microbiome in lung health are also explored, examining the eye as a gateway for respiratory virus transmission, and assessing the impact of environmental irritants on both ocular and respiratory systems. This novel concept emphasizes a bidirectional relationship between respiratory and ocular health, suggesting that respiratory diseases may influence ocular conditions and vice versa, whereby this conception provides a comprehensive framework for understanding the intricate axis connecting both respiratory and ocular health. These aspects underscore the need for an integrative approach in the management of chronic respiratory diseases. Future research should further elucidate the in-depth molecular mechanisms affecting this axis which would pave the path for novel diagnostics and effective therapeutic strategies.
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Affiliation(s)
- Venkata Sita Rama Raju Allam
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden; Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Vyoma K Patel
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, P.O. Box 123, Broadway, Ultimo, NSW 2007, Australia; Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Clinical Medicine, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW 2052, Australia
| | - Gabriele De Rubis
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, P.O. Box 123, Broadway, Ultimo, NSW 2007, Australia; Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Keshav Raj Paudel
- Centre for Inflammation, Centenary Institute and University of Technology Sydney, School of Life Sciences, Faculty of Science, Sydney, NSW 2007, Australia
| | - Gaurav Gupta
- Centre for Global Health Research, Saveetha Medical College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, India; School of Pharmacy, Graphic Era Hill University, Dehradun 248007, India; School of Pharmacy, Suresh Gyan Vihar University, Jagatpura, Jaipur, India
| | - Dinesh Kumar Chellappan
- Department of Life Sciences, School of Pharmacy, International Medical University, Bukit Jalil, 57000 Kuala Lumpur, Malaysia
| | - Sachin Kumar Singh
- Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Philip M Hansbro
- Centre for Inflammation, Centenary Institute and University of Technology Sydney, School of Life Sciences, Faculty of Science, Sydney, NSW 2007, Australia
| | - Brian Gregory George Oliver
- Woolcock Institute of Medical Research, Macquarie University, Sydney, New South Wales, Australia; School of Life Science, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Kamal Dua
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, P.O. Box 123, Broadway, Ultimo, NSW 2007, Australia; Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, NSW 2007, Australia.
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2
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Cong Y, Zhang Y, Han Y, Wu Y, Wang D, Zhang B. Recommendations for nutritional supplements for dry eye disease: current advances. Front Pharmacol 2024; 15:1388787. [PMID: 38873421 PMCID: PMC11169594 DOI: 10.3389/fphar.2024.1388787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 04/17/2024] [Indexed: 06/15/2024] Open
Abstract
Dry eye disease (DED) represents a prevalent ocular surface disease. The development of effective nutritional management strategies for DED is crucial due to its association with various factors such as inflammation, oxidative stress, deficiencies in polyunsaturated fatty acids (PUFAs), imbalanced PUFA ratios, and vitamin insufficiencies. Extensive research has explored the impact of oral nutritional supplements, varying in composition and dosage, on the symptoms of DED. The main components of these supplements include fish oils (Omega-3 fatty acids), vitamins, trace elements, and phytochemical extracts. Beyond these well-known nutrients, it is necessary to explore whether novel nutrients might contribute to more effective DED management. This review provides a comprehensive update on the therapeutic potential of nutrients and presents new perspectives for combination supplements in DED treatment.
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Affiliation(s)
| | | | | | | | | | - Bingjie Zhang
- Department of Ophthalmology, The First Hospital of Jilin University, Changchun, China
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3
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Caruso L, Fields M, Rimondi E, Zauli G, Longo G, Marcuzzi A, Previati M, Gonelli A, Zauli E, Milani D. Classical and Innovative Evidence for Therapeutic Strategies in Retinal Dysfunctions. Int J Mol Sci 2024; 25:2124. [PMID: 38396799 PMCID: PMC10889839 DOI: 10.3390/ijms25042124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/05/2024] [Accepted: 02/07/2024] [Indexed: 02/25/2024] Open
Abstract
The human retina is a complex anatomical structure that has no regenerative capacity. The pathogenesis of most retinopathies can be attributed to inflammation, with the activation of the inflammasome protein platform, and to the impact of oxidative stress on the regulation of apoptosis and autophagy/mitophagy in retinal cells. In recent years, new therapeutic approaches to treat retinopathies have been investigated. Experimental data suggest that the secretome of mesenchymal cells could reduce oxidative stress, autophagy, and the apoptosis of retinal cells, and in turn, the secretome of the latter could induce changes in mesenchymal cells. Other studies have evidenced that noncoding (nc)RNAs might be new targets for retinopathy treatment and novel disease biomarkers since a correlation has been found between ncRNA levels and retinopathies. A new field to explore is the interaction observed between the ocular and intestinal microbiota; indeed, recent findings have shown that the alteration of gut microbiota seems to be linked to ocular diseases, suggesting a gut-eye axis. To explore new therapeutical strategies for retinopathies, it is important to use proper models that can mimic the complexity of the retina. In this context, retinal organoids represent a good model for the study of the pathophysiology of the retina.
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Affiliation(s)
- Lorenzo Caruso
- Department of Environmental and Prevention Sciences, University of Ferrara, 44121 Ferrara, Italy; (L.C.); (A.G.)
| | - Matteo Fields
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.F.); (G.L.); (A.M.); (M.P.); (D.M.)
| | - Erika Rimondi
- Department of Translational Medicine and LTTA Centre, University of Ferrara, 44121 Ferrara, Italy
| | - Giorgio Zauli
- Research Department, King Khaled Eye Specialist Hospital, Riyadh 11462, Saudi Arabia;
| | - Giovanna Longo
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.F.); (G.L.); (A.M.); (M.P.); (D.M.)
| | - Annalisa Marcuzzi
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.F.); (G.L.); (A.M.); (M.P.); (D.M.)
| | - Maurizio Previati
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.F.); (G.L.); (A.M.); (M.P.); (D.M.)
| | - Arianna Gonelli
- Department of Environmental and Prevention Sciences, University of Ferrara, 44121 Ferrara, Italy; (L.C.); (A.G.)
| | - Enrico Zauli
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.F.); (G.L.); (A.M.); (M.P.); (D.M.)
| | - Daniela Milani
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.F.); (G.L.); (A.M.); (M.P.); (D.M.)
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4
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Mi C, Hou A, Wang Z, Qi X, Teng J. Causal relationship between gut microbiota and myasthenia gravis: a two-sample Mendelian randomization study. Front Neurol 2024; 15:1309530. [PMID: 38333605 PMCID: PMC10850378 DOI: 10.3389/fneur.2024.1309530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Accepted: 01/12/2024] [Indexed: 02/10/2024] Open
Abstract
Background Previous observational studies have provided cumulative data linking gut microbiota to myasthenia gravis (MG). However, the causal link between the two remains unexplored. Hence, the current study was performed to explore the causal link between them. Methods Mendelian randomization (MR) analysis was conducted using the summary statistics of 211 gut microbiota taxa and the largest genome-wide association studies (GWAS) for MG currently available. The inverse variance-weighted (IVW), MR-Egger, weighted median, and weighted mode methods were employed to ascertain the causal influence. Sensitivity studies utilizing several methodologies were then used to assess the robustness of the findings. Lastly, to evaluate reverse causality, a reverse MR analysis was performed. Results Seven suggestive causal associations between the gastrointestinal microbiota and MG were identified based on the outcomes of the MR analysis. Specifically, phylum Actinobacteria (OR: 0.602, 95% CI: 0.405-0.896, p = 0.012), class Gammaproteobacteria (OR: 0.587, 95% CI: 0.357-0.968, p = 0.037), and families Defluviitaleaceae (OR: 0.695, 95% CI: 0.485-0.996, p = 0.047), Family XIII (OR: 0.614, 95% CI: 0.412-0.916, p = 0.017), and Peptococcaceae (OR: 0.698, 95% CI: 0.505-0.964, p = 0.029) had suggestive protective effects on MG, while order Mollicutes RF9 (OR: 1.424, 95% CI: 1.015-1.998, p = 0.041) and genus Faecalibacterium (OR: 1.763, 95% CI: 1.220-2.547, p = 0.003) were suggestive risk factors for MG. The outcomes indicate that neither heterogeneity nor horizontal pleiotropy had any discernible impact. Nevertheless, this reverse analysis did not reveal any apparent effect of MG on the gut microbiota composition. Conclusion The MR investigation has substantiated the suggestive causal connection between gut microbiota and MG, which may provide helpful insights for innovative therapeutic and preventative approaches for MG. Further randomized controlled trials are needed to elucidate the gut microbiota's precise role and therapeutic potential in the pathogenesis of MG.
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Affiliation(s)
- Chuanhao Mi
- First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
| | - Ajiao Hou
- Key Laboratory of Basic and Application Research of Beiyao, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, China
| | - Ziyue Wang
- First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
| | - Xianghua Qi
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
| | - Jing Teng
- First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
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Qian Z, Xia H, Zhou J, Wang R, Zhu D, Chen L, Kang H, Feng J, Hu X, Wang L, Xu S, Lou Z, Tao Y. Performance of Metagenomic Next-Generation Sequencing of Cell-Free DNA From Vitreous and Aqueous Humor for Diagnoses of Intraocular Infections. J Infect Dis 2024; 229:252-261. [PMID: 37882788 DOI: 10.1093/infdis/jiad363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 08/28/2023] [Indexed: 10/27/2023] Open
Abstract
BACKGROUND Delayed diagnosis and improper therapy for intraocular infections usually result in poor prognosis. Due to limitations of conventional culture and polymerase chain reaction methods, most causative pathogens cannot be identified from vitreous humor (VH) or aqueous humor (AH) samples with limited volume. METHODS Patients with suspected intraocular infections were enrolled from January 2019 to August 2021. Metagenomic next-generation sequencing (mNGS) was used to detected causative pathogens. RESULTS This multicenter prospective study enrolled 488 patients, from whom VH (152) and AH (336) samples were respectively collected and analyzed using mNGS of cell-free DNA (cfDNA). Taking final comprehensive clinical diagnosis as the gold standard, there were 39 patients with indefinite final diagnoses, whereas 288 and 161 patients were diagnosed as definite infectious and noninfectious diseases, respectively. Based on clinical adjudication, the sensitivity (92.2%) and total coincidence rate (81.3%) of mNGS using VH samples were slightly higher than those of mNGS using AH samples (85.4% and 75.4%, respectively). CONCLUSIONS Using mNGS of cfDNA, an era with clinical experience for more rapid, independent, and impartial diagnosis of bacterial and other intraocular infections can be expected.
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Affiliation(s)
- Zhuyun Qian
- Department of Ophthalmology, Beijing Chaoyang Hospital, Capital Medical University
- Key Laboratory jointly built by the National Institute for Viral Disease Control and Prevention of China Center for Disease Control and Prevention, Beijing GIANTMED Medical Diagnostics Laboratory
- Department of Medicine, Beijing GIANTMED Medical Diagnostics Laboratory
| | - Han Xia
- Department of Scientific Affairs, Hugobiotech Co, Ltd, Beijing
| | - Jiemin Zhou
- Department of Scientific Affairs, Hugobiotech Co, Ltd, Beijing
| | - Ruifeng Wang
- Department of Ophthalmology, Zhengzhou Second People's Hospital, Zhengzhou, Henan
| | - Dan Zhu
- Department of Ophthalmology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia
| | - Li Chen
- Department of Ophthalmology, Beijing Chaoyang Hospital, Capital Medical University
| | - Hao Kang
- Department of Ophthalmology, Beijing Chaoyang Hospital, Capital Medical University
| | - Jing Feng
- Department of Ophthalmology, Beijing Chaoyang Hospital, Capital Medical University
| | - Xiaofeng Hu
- Department of Ophthalmology, Beijing Chaoyang Hospital, Capital Medical University
| | - Lu Wang
- Department of Medicine, Beijing GIANTMED Medical Diagnostics Laboratory
| | - Songtao Xu
- National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Zheng Lou
- Department of Scientific Affairs, Hugobiotech Co, Ltd, Beijing
| | - Yong Tao
- Department of Ophthalmology, Beijing Chaoyang Hospital, Capital Medical University
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Huang L, Hong Y, Fu X, Tan H, Chen Y, Wang Y, Chen D. The role of the microbiota in glaucoma. Mol Aspects Med 2023; 94:101221. [PMID: 37866106 DOI: 10.1016/j.mam.2023.101221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 10/10/2023] [Accepted: 10/12/2023] [Indexed: 10/24/2023]
Abstract
Glaucoma is a common irreversible vision loss disorder because of the gradual loss of retinal ganglion cells (RGCs) and the optic nerve axons. Major risk factors include elder age and high intraocular pressure (IOP). However, high IOP is neither necessary nor sufficient to cause glaucoma. Some non-IOP signaling cascades can mediate RGC degeneration. In addition, gender, diet, obesity, depression, or anxiety also contribute to the development of glaucoma. Understanding the mechanism of glaucoma development is crucial for timely diagnosis and establishing new strategies to improve current IOP-reducing therapies. The microbiota exerts a marked influence on the human body during homeostasis and disease. Many glaucoma patients have abnormal compositions of the microbiota (dysbiosis) in multiple locations, including the ocular surface, intraocular cavity, oral cavity, stomach, and gut. Here, we discuss findings in the last ten years or more about the microbiota and metabolite changes in animal models, patients with three risk factors (aging, obesity, and depression), and glaucoma patients. Antigenic mimicry and heat stress protein (HSP)-specific T-cell infiltration in the retina may be responsible for commensal microbes contributing to glaucomatous RGC damage. LPS-TLR4 pathway may be the primary mechanism of oral and ocular surface dysbiosis affecting glaucoma. Microbe-derived metabolites may also affect glaucoma pathogenesis. Homocysteine accumulation, inflammatory factor release, and direct dissemination may link gastric H. pylori infection and anterior chamber viral infection (such as cytomegalovirus) to glaucoma. Potential therapeutic protocols targeting microbiota include antibiotics, modified diet, and stool transplant. Later investigations will uncover the underlying molecular mechanism connecting dysbiosis to glaucoma and its clinical applications in glaucoma management.
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Affiliation(s)
- Ling Huang
- The Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China; The Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yiwen Hong
- The Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China; The Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xiangyu Fu
- The Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China; The Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Haishan Tan
- The Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China; The Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yongjiang Chen
- The School of Optometry and Vision Science, University of Waterloo, 200 University Ave. W., Waterloo, ON, N2L 3G1, Canada
| | - Yujiao Wang
- The Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China; The Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Danian Chen
- The Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China; The Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China.
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Durán-Manuel EM, Bello-López JM, Salinas-Bobadilla AD, Vargas-De-León C, Nieto-Velázquez NG, Moreno-Eutimio MA, Pastelin-Palacios R, Calzada-Mendoza CC, Blanco-Hernández DMR. Molecular Characterization of Bacterial Agents Causing External Ocular Infections Isolates of Patients in a Third Level Hospital. Pathogens 2023; 12:1294. [PMID: 38003759 PMCID: PMC10675722 DOI: 10.3390/pathogens12111294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 10/23/2023] [Accepted: 10/26/2023] [Indexed: 11/26/2023] Open
Abstract
Empirical use of antibiotics in the treatment of eye infections leads to bacterial pathogens becoming resistant to antibiotics; consequently, treatment failure and eye health complications occur. The aim of this study was to describe the phenotype and genotype of the resistance and adherence of bacterial agents causing eye infections in patients at Hospital Juárez de México. An observational, prospective, cross-sectional, and descriptive study was carried out in patients with signs and symptoms of ocular infection. Bacterial agents were isolated and identified by classical microbiology and mass spectrometry. Antibiotic resistance and adherence profiles were determined. Finally, resistance (mecA/SCCmec) and virulence (icaA and icaD) genes were detected in the Gram-positive population. The results showed that blepharitis was the most prevalent condition in the study population. A MALDI-TOF analysis revealed that Staphylococcus and Pseudomonas genus were the most prevalent as causal agents of infection. Resistances to β-lactams were detected of 44 to 100%, followed by clindamycins, aminoglycosides, folate inhibitors, and nitrofurans. A multiple correspondence analysis showed a relationship between mecA genotype and β-lactams resistance. The identification of SCCmecIII and SCCmecIV elements suggested community and hospital sources of infection. Finally, the coexistence of icaA+/icaD+/mecA(SCCmecIII) and icaA+/icaD+/mecA(SCCmecIV) genotypes was detected in S. aureus. The identification of resistant and virulent isolates highlights the importance of developing protocols that address the timely diagnosis of ocular infections. Herein, implications for the failure of antimicrobial therapy in the treatment of ocular infections in susceptible patients are analysed and discussed.
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Affiliation(s)
- Emilio Mariano Durán-Manuel
- Hospital Juárez de México, Mexico City 07760, Mexico
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City 11340, Mexico
| | | | | | - Cruz Vargas-De-León
- Hospital Juárez de México, Mexico City 07760, Mexico
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City 11340, Mexico
| | | | - Mario Adán Moreno-Eutimio
- Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City 04510, Mexico
| | - Rodolfo Pastelin-Palacios
- Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, Mexico City 09230, Mexico
| | - Claudia Camelia Calzada-Mendoza
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City 11340, Mexico
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8
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Zhou L, Ho BM, Chan HYE, Tong Y, Du L, He JN, Ng DSC, Tham CC, Pang CP, Chu WK. Emerging Roles of cGAS-STING Signaling in Mediating Ocular Inflammation. J Innate Immun 2023; 15:739-750. [PMID: 37778330 PMCID: PMC10616671 DOI: 10.1159/000533897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 08/28/2023] [Indexed: 10/03/2023] Open
Abstract
Cyclic GMP-AMP (cGAMP) synthase (cGAS), a sensor of cytosolic DNA, recognizes cytoplasmic nucleic acids to activate the innate immune responses via generation of the second messenger cGAMP and subsequent activation of the stimulator of interferon genes (STINGs). The cGAS-STING signaling has multiple immunologic and physiological functions in all human vital organs. It mediates protective innate immune defense against DNA-containing pathogen infection, confers intrinsic antitumor immunity via detecting tumor-derived DNA, and gives rise to autoimmune and inflammatory diseases upon aberrant activation by cytosolic leakage of self-genomic and mitochondrial DNA. Disruptions in these functions are associated with the pathophysiology of various immunologic and neurodegenerative diseases. Recent evidence indicates important roles of the cGAS-STING signaling in mediating inflammatory responses in ocular inflammatory and inflammation-associated diseases, such as keratitis, diabetic retinopathy, age-related macular degeneration, and uveitis. In this review, we summarize the recently emerging evidence of cGAS-STING signaling in mediating ocular inflammatory responses and affecting pathogenesis of these complex eye diseases. We attempt to provide insightful perspectives on future directions of investigating cGAS-STING signaling in ocular inflammation. Understanding how cGAS-STING signaling is modulated to mediate ocular inflammatory responses would allow future development of novel therapeutic strategies to treat ocular inflammation and autoimmunity.
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Affiliation(s)
- Linbin Zhou
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Bo Man Ho
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Hoi Ying Emily Chan
- Medicine Programme Global Physician-Leadership Stream, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Yan Tong
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Lin Du
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Jing Na He
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Danny Siu-Chun Ng
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Clement C. Tham
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Chi Pui Pang
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
| | - Wai Kit Chu
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR
- Joint Shantou International Eye Center, Shantou University and the Chinese University of Hong Kong, Shantou, China
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9
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Barrera B, Bustamante A, Marín-Cornuy M, Aguila-Torres P. Contact lenses and ocular dysbiosis, from the transitory to the pathological. ARCHIVOS DE LA SOCIEDAD ESPANOLA DE OFTALMOLOGIA 2023; 98:586-594. [PMID: 37648207 DOI: 10.1016/j.oftale.2023.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 07/19/2023] [Indexed: 09/01/2023]
Abstract
Normal ocular microbiota is composed of different Gram-negative and positive bacterial communities that act as commensals on the ocular surface. An imbalance in the homeostasis of the native species or dysbiosis triggers functional alterations that can eventually lead to ocular conditions, indicating the use of contact lenses as the most relevant predisposing factor. Through a bibliographic review that added scientific articles published between 2018 and 2022, the relationship between healthy ocular microbiota and dysbiosis associated with the use of contact lenses that trigger ocular conditions was analyzed. The ocular microbiota in healthy individuals is mainly composed of bacteria from the phyla: Proteobacteria, Actinobacteria and Firmicutes. These bacterial communities associated with the use of contact lenses develop dysbiosis, observing an increase in certain genera such as Staphylococcus spp. and Pseudomonas spp., which under normal conditions are commensals of the ocular surface, but as their abundance is increased, they condition the appearance of various ocular conditions such as corneal infiltrative events, bacterial keratitis and corneal ulcer. These pathologies tend to evolve rapidly, which, added to late detection and treatment, can lead to a poor visual prognosis. It is suggested that professionals in the ophthalmology area learn about the composition of the communities of microorganisms that make up this ocular microbiota, in order to correctly distinguish and identify the causative agent, thereby providing a adequate and effective treatment to the user.
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Affiliation(s)
- B Barrera
- Laboratorio de Microbiología Molecular, Escuela de Tecnología Médica, Universidad Austral de Chile, Puerto Montt, Chile
| | - A Bustamante
- Laboratorio de Microbiología Molecular, Escuela de Tecnología Médica, Universidad Austral de Chile, Puerto Montt, Chile
| | - M Marín-Cornuy
- Laboratorio de Microbiología Molecular, Escuela de Tecnología Médica, Universidad Austral de Chile, Puerto Montt, Chile
| | - P Aguila-Torres
- Laboratorio de Microbiología Molecular, Escuela de Tecnología Médica, Universidad Austral de Chile, Puerto Montt, Chile.
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10
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Sajiki AF, Koyanagi Y, Ushida H, Kawano K, Fujita K, Okuda D, Kawabe M, Yamada K, Suzumura A, Kachi S, Kaneko H, Komatsu H, Usui Y, Goto H, Nishiguchi KM. Association Between Torque Teno Virus and Systemic Immunodeficiency in Patients With Uveitis With a Suspected Infectious Etiology. Am J Ophthalmol 2023; 254:80-86. [PMID: 37356647 DOI: 10.1016/j.ajo.2023.06.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 04/27/2023] [Accepted: 06/03/2023] [Indexed: 06/27/2023]
Abstract
PURPOSE To determine the correlation between the presence of torque teno virus (TTV) in the aqueous humor of patients with uveitis and clinical information, including immunodeficiency history. DESIGN Multicenter, retrospective, cross-sectional study. METHODS Fifty-eight patients with uveitis with a suspected infectious etiology and 24 controls with cataract or age-related macular degeneration were included. We used quantitative polymerase chain reaction to test all subjects for TTV and multiplex polymerase chain reaction to test uveitis subjects for common ocular pathogens. When possible, both serum and aqueous humor samples were tested. Ocular TTV positivity was compared with age, sex, and a history of systemic immunodeficiency with logistic analysis. RESULTS Ocular TTV positivity was found in 23%, 11%, and 0% of patients with herpetic uveitis, nonherpetic uveitis, and controls, respectively. Among patients with herpes infection, positivity for ocular TTV was found in 43%, 8%, 14%, and 50% of patients with cytomegalovirus retinitis, iridocyclitis, acute retinal necrosis, and Epstein-Barr virus-positive uveitis, respectively. Patients with cytomegalovirus retinitis showed a significantly higher rate of ocular TTV infection than controls (P = .008). Serum analysis revealed TTV positivity in 90% of patients with uveitis and in 100% of controls. Age- and gender-adjusted logistic analysis revealed a correlation between ocular TTV positivity and systemic immunodeficiency (P = .01), but no correlations between ocular TTV and age, gender, or viral pathogenic type. CONCLUSIONS These findings suggest that positivity for ocular TTV was correlated with a clinical history of systemic immunodeficiency.
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Affiliation(s)
- Ai Fujita Sajiki
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.).
| | - Yoshito Koyanagi
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
| | - Hiroaki Ushida
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.).
| | - Kenichi Kawano
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.); Department of Ophthalmology, Yokkaichi Municipal Hospital, Yokkaichi, Japan (K.K.)
| | - Kosuke Fujita
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
| | - Daishi Okuda
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
| | - Mitsuki Kawabe
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
| | - Kazuhisa Yamada
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
| | - Ayana Suzumura
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
| | - Shu Kachi
- Shohzankai Medical Foundation, Miyake Eye Hospital, Nagoya, Japan (S.K.)
| | - Hiroki Kaneko
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
| | - Hiroyuki Komatsu
- Department of Ophthalmology, Tokyo Medical University, Tokyo, Japan (H.K., Y.U., H.G.)
| | - Yoshihiko Usui
- Department of Ophthalmology, Tokyo Medical University, Tokyo, Japan (H.K., Y.U., H.G.)
| | - Hiroshi Goto
- Department of Ophthalmology, Tokyo Medical University, Tokyo, Japan (H.K., Y.U., H.G.)
| | - Koji M Nishiguchi
- From the Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan (A.F.S., Y.K., H.U., K.K., K.F., D.O., M.K., K.Y., A.S., H.K., K.M.N.)
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11
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Villafán H, Gutiérrez-Ospina G. Looking beyond Self-Protection: The Eyes Instruct Systemic Immune Tolerance Early in Life. Brain Sci 2023; 13:1261. [PMID: 37759864 PMCID: PMC10526493 DOI: 10.3390/brainsci13091261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 08/15/2023] [Accepted: 08/18/2023] [Indexed: 09/29/2023] Open
Abstract
The eyes provide themselves with immune tolerance. Frequent skin inflammatory diseases in young blind people suggest, nonetheless, that the eyes instruct a systemic immune tolerance that benefits the whole body. We tested this premise by using delayed skin contact hypersensitivity (DSCH) as a tool to compare the inflammatory response developed by sighted (S) and birth-enucleated (BE) mice against oxazolone or dinitrofluorobenzene at the ages of 10, 30 and 60 days of life. Adult mice enucleated (AE) at 60 days of age were also assessed when they reached 120 days of life. BE mice displayed exacerbated DSCH at 60 but not at 10 or 30 days of age. AE mice, in contrast, show no exacerbated DSCH. Skin inflammation in 60-day-old BE mice was hapten exclusive and supported by distinct CD8+ lymphocytes. The number of intraepidermal T lymphocytes and migrating Langerhans cells was, however, similar between S and BE mice by the age of 60 days. Our observations support the idea that the eyes instruct systemic immune tolerance that benefits organs outside the eyes from an early age. The higher prevalence of inflammatory skin disorders reported in young people might then reflect reduced immune tolerance associated with the impaired functional morphology of the eyes.
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Affiliation(s)
- Horacio Villafán
- Programa de Doctorado en Ciencias Biológicas, Unidad de Posgrado, Circuito de Posgrados, Ciudad Universitaria, Edificio D, 1piso, Coyoacán, Ciudad de México 04510, Mexico
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
| | - Gabriel Gutiérrez-Ospina
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
- Coordinación de Psicobiología y Neurociencias, Facultad de Psicología, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
- Department of Zoology and Physiology and Wyoming Sensory Biology Center of Biomedical Research Excellence, University of Wyoming, Laramie, WY 82071, USA
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12
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Campagnoli LIM, Varesi A, Barbieri A, Marchesi N, Pascale A. Targeting the Gut-Eye Axis: An Emerging Strategy to Face Ocular Diseases. Int J Mol Sci 2023; 24:13338. [PMID: 37686143 PMCID: PMC10488056 DOI: 10.3390/ijms241713338] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 08/20/2023] [Accepted: 08/26/2023] [Indexed: 09/10/2023] Open
Abstract
The human microbiota refers to a large variety of microorganisms (bacteria, viruses, and fungi) that live in different human body sites, including the gut, oral cavity, skin, and eyes. In particular, the presence of an ocular surface microbiota with a crucial role in maintaining ocular surface homeostasis by preventing colonization from pathogen species has been recently demonstrated. Moreover, recent studies underline a potential association between gut microbiota (GM) and ocular health. In this respect, some evidence supports the existence of a gut-eye axis involved in the pathogenesis of several ocular diseases, including age-related macular degeneration, uveitis, diabetic retinopathy, dry eye, and glaucoma. Therefore, understanding the link between the GM and these ocular disorders might be useful for the development of new therapeutic approaches, such as probiotics, prebiotics, symbiotics, or faecal microbiota transplantation through which the GM could be modulated, thus allowing better management of these diseases.
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Affiliation(s)
| | - Angelica Varesi
- Department of Biology and Biotechnology, University of Pavia, 27100 Pavia, Italy;
| | - Annalisa Barbieri
- Department of Drug Sciences, Unit of Pharmacology, University of Pavia, 27100 Pavia, Italy; (A.B.); (N.M.)
| | - Nicoletta Marchesi
- Department of Drug Sciences, Unit of Pharmacology, University of Pavia, 27100 Pavia, Italy; (A.B.); (N.M.)
| | - Alessia Pascale
- Department of Drug Sciences, Unit of Pharmacology, University of Pavia, 27100 Pavia, Italy; (A.B.); (N.M.)
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13
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Shi H, Huai S, Wei H, Xu Y, Lei L, Chen H, Li X, Ma H. Dissolvable hybrid microneedle patch for efficient delivery of curcumin to reduce intraocular inflammation. Int J Pharm 2023; 643:123205. [PMID: 37422141 DOI: 10.1016/j.ijpharm.2023.123205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 06/19/2023] [Accepted: 07/03/2023] [Indexed: 07/10/2023]
Abstract
Intraocular inflammation seriously impairs vision, and the effectiveness of intraocular drug delivery is hampered by various physiological barriers, such as the corneal barrier. In this paper, we present a simple approach to fabricating a dissolvable hybrid microneedles (MNs) patch for the efficient delivery of curcumin to treat intraocular inflammatory disorders. Water-insoluble curcumin was first encapsulated into polymeric micelles with high anti-inflammatory capacities, and then were combined with hyaluronic acid (HA) to create a dissolvable hybrid MNs patch using a simple micromolding method. Curcumin was amorphously dispersed within the MNs patch as indicated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) analyses. According to an in vitro drug release study, the proposed MNs patch provided sustainable drug release over 8 h. Following its in vivo topical application, the MNs patch demonstrated an extended pre-corneal retention time over 3.5 h and exhibited great ocular biocompatibility. Additionally, such MNs patch could reversibly penetrate the corneal epithelium, generating an array of microchannels on the corneal surface, thereby increasing ocular bioavailability. Of greater significance, the use of MNs patch demonstrated the improved therapeutic effectiveness in treating endotoxin-induced uveitis (EIU) in a rabbit model compared to curcumin eye drops via a significant reduction in the infiltration of inflammatory cells such as CD45+ leukocytes and CD68+ macrophages. Overall, the topical application of the MNs patch as an efficient ocular drug delivery system could potentially serve as a promising approach for treating different types of intraocular disorders.
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Affiliation(s)
- Hui Shi
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Shuo Huai
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Huiling Wei
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Ying Xu
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Lei Lei
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Hao Chen
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Xingyi Li
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China.
| | - Huixiang Ma
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China.
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14
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Mergen B, Onal I, Gulmez A, Caytemel C, Yildirim Y. Conjunctival Microbiota and Blepharitis Symptom Scores in Patients With Ocular Rosacea. Eye Contact Lens 2023; 49:339-343. [PMID: 37363964 DOI: 10.1097/icl.0000000000001008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2023] [Indexed: 06/28/2023]
Abstract
PURPOSE Investigation of the relationship between blepharitis-related symptom scores, tear film functions, and conjunctival microbiota in patients with ocular rosacea (OR) compared with healthy controls was aimed. METHODS Consecutive 33 eyes of 33 patients with OR who were admitted from the dermatology clinic and age-matched and gender-matched 30 healthy controls were included in the study. Tear breakup time (TBUT), Schirmer score, and blepharitis symptom score (BLISS) were recorded for each patient. For the bacteriological examination, bacterial culture was obtained by inoculating the samples on chocolate agar, blood agar, and fluid thioglycollate medium. The growth of different colonies of bacteria was identified using matrix-assisted laser desorption or ionization time-of-flight mass spectrometry. RESULTS Bacterial culture positivity was observed in 13 eyes (39.4%) in the patients with OR and 10 eyes (33.3%) in the controls ( P =0.618). Patients with OR showed worse TBUT and Schirmer scores, and higher BLISSs ( P =0.005, P =0.007, and P =0.001, respectively). Patients with OR with conjunctival culture-positive results showed higher BLISSs (8.0±4.7) compared with those with negative results (4.7±2.3; P <0.001). The most frequent bacteria was Micrococcus luteus (18.2%) in patients with OR and Staphylococcus epidermidis (20.0%) in the controls. CONCLUSION This pilot study showed that patients with OR had similar conjunctival culture positivity compared with healthy controls. However, the observation of different dominant bacterial species in conjunctival microbiota and the observation of worse BLISSs in patients with OR with positive culture might suggest a potential role of conjunctival microbiota in the pathogenesis of OR.
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Affiliation(s)
- Burak Mergen
- Department of Ophthalmology (B.M., I.O., Y.Y.); Department of Medical Microbiology (A.G.); and Department of Dermatology and Venereology (C.C.), University of Health Sciences, Basaksehir Cam and Sakura City Hospital, Istanbul, Turkey
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15
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Casciano F, Zauli E, Busin M, Caruso L, AlMesfer S, Al-Swailem S, Zauli G, Yu AC. State of the Art of Pharmacological Activators of p53 in Ocular Malignancies. Cancers (Basel) 2023; 15:3593. [PMID: 37509256 PMCID: PMC10377487 DOI: 10.3390/cancers15143593] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 06/29/2023] [Accepted: 07/07/2023] [Indexed: 07/30/2023] Open
Abstract
The pivotal role of p53 in the regulation of a vast array of cellular functions has been the subject of extensive research. The biological activity of p53 is not strictly limited to cell cycle arrest but also includes the regulation of homeostasis, DNA repair, apoptosis, and senescence. Thus, mutations in the p53 gene with loss of function represent one of the major mechanisms for cancer development. As expected, due to its key role, p53 is expressed throughout the human body including the eye. Specifically, altered p53 signaling pathways have been implicated in the development of conjunctival and corneal tumors, retinoblastoma, uveal melanoma, and intraocular melanoma. As non-selective cancer chemotherapies as well as ionizing radiation can be associated with either poor efficacy or dose-limiting toxicities in the eye, reconstitution of the p53 signaling pathway currently represents an attractive target for cancer therapy. The present review discusses the role of p53 in the pathogenesis of these ocular tumors and outlines the various pharmacological activators of p53 that are currently under investigation for the treatment of ocular malignancies.
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Affiliation(s)
- Fabio Casciano
- Department of Translational Medicine and LTTA Centre, University of Ferrara, 44121 Ferrara, Italy
| | - Enrico Zauli
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy
| | - Massimo Busin
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy
- Department of Ophthalmology, Ospedali Privati Forlì "Villa Igea", 47122 Forlì, Italy
- Istituto Internazionale per la Ricerca e Formazione in Oftalmologia (IRFO), 47122 Forlì, Italy
| | - Lorenzo Caruso
- Department of Environmental and Prevention Sciences, University of Ferrara, 44121 Ferrara, Italy
| | - Saleh AlMesfer
- Research Department, King Khaled Eye Specialistic Hospital, Riyadh 12329, Saudi Arabia
| | - Samar Al-Swailem
- Research Department, King Khaled Eye Specialistic Hospital, Riyadh 12329, Saudi Arabia
| | - Giorgio Zauli
- Research Department, King Khaled Eye Specialistic Hospital, Riyadh 12329, Saudi Arabia
| | - Angeli Christy Yu
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy
- Department of Ophthalmology, Ospedali Privati Forlì "Villa Igea", 47122 Forlì, Italy
- Istituto Internazionale per la Ricerca e Formazione in Oftalmologia (IRFO), 47122 Forlì, Italy
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16
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Makrakis LR, Oliveira VC, Santos ES, Nascimento C, Watanabe E, Ribeiro AB, Silva-Lovato CH. Analysis of microbial communities of ocular prostheses and anophthalmic sockets using 16S rRNA gene sequencing. BIOFOULING 2023; 39:555-564. [PMID: 37470406 DOI: 10.1080/08927014.2023.2236562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 06/06/2023] [Accepted: 07/07/2023] [Indexed: 07/21/2023]
Abstract
Ocular prostheses are liable to host microbial adhesion, which can favor conjunctival inflammation. Knowing the microbiota of the ocular prosthesis and anophthalmic socket is important for predicting infection-related pathogens. This study evaluated the microbiota of the prostheses and anophthalmic sockets of six individuals by 16S rRNA sequencing. The microbial abundance and diversity were analyzed using the Operational Taxonomic Units at the genus level. Forty-seven phyla, capturing 1,258 named genera, were recorded in the sample set. In both sites, the most frequent genera were Fusobacterium, Staphylococcus, Prevotella, and Streptococcus. The microbial abundance was higher for the anophthalmic socket than for the prosthesis. Alpha diversity showed no significant differences in bacterial richness or diversity between sites. Although the microbial abundance in the anophthalmic socket was higher, both sites had similar microbiota with high diversity and low dominance among the genera.
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Affiliation(s)
- L R Makrakis
- Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - V C Oliveira
- Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- Human Exposome and Infectious Diseases Network-HEID, School of Nursing of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - E S Santos
- Department of Clinical Toxicological and Bromatologic Analysis, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - C Nascimento
- Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - E Watanabe
- Human Exposome and Infectious Diseases Network-HEID, School of Nursing of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - A B Ribeiro
- Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - C H Silva-Lovato
- Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
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17
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Effect of Liposomal-Lactoferrin-Based Eye Drops on the Conjunctival Microflora of Patients Undergoing Cataract Surgery. Ophthalmol Ther 2023; 12:1315-1326. [PMID: 36826753 PMCID: PMC10011268 DOI: 10.1007/s40123-023-00673-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 01/31/2023] [Indexed: 02/25/2023] Open
Abstract
INTRODUCTION Postoperative endophthalmitis is typically caused by the patient's conjunctival bacterial flora. Povidone iodine solution (5%) is used perioperatively to obtain periocular and ocular antisepsis. However, an adjunctive prophylaxis procedure could further help control the conjunctival microbial load. Considering the increase in antibiotic resistance, a progressive shift toward alternative methods would be desirable. Somilux® eye drops (Alfa Intes, lactoferrin-based eye drops) are medical devices containing liposomal lactoferrin (LF). This study evaluates the effects on conjunctival microflora of LF-based eye drops used in the preoperative phase in patients scheduled for cataract surgery. METHODS LF-based eye drops or a vehicle solution (water solution) were instilled 4 times a day starting 3 days before cataract surgery. Before the therapy (T0) and at the time of surgery (T1), a conjunctival swab was performed in both eyes and processed to detect microbial growth, microbiological isolation, and species identification. The outcome was the quantification and characterization of the local microbial flora before and after using LF-based or vehicle-based eye drops. Safety of the treatments was also evaluated. RESULTS 88 eyes of 44 patients (mean [± SD] age 75 [± 12.6] years) were enrolled. At baseline, 54 conjunctival swabs showed only saprophytic flora, 27 showed only potential pathogenic flora, and seven showed both of them. LF-based eye drops reduced the proportion of potentially pathogenic bacteria (36% at T0 vs. 9% at T1, p = 0.008) compared with the vehicle (41% at T0 vs. 55% at T1, p = 0.302) without altering the physiological ocular microbial composition. No adverse events have been reported. CONCLUSION Our findings provide a novel contribution to the scientific knowledge on the role of LF in the ophthalmic field, supporting the use of LF-based eye drops as a safe and selective treatment to improve the ocular surface physiological defenses and control the bacterial ocular surface contamination prior to cataract surgery.
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Fanlo Mateo P. [Uveitis]. Med Clin (Barc) 2023; 160:258-260. [PMID: 36253202 DOI: 10.1016/j.medcli.2022.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/08/2022] [Accepted: 09/09/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Patricia Fanlo Mateo
- Unidad de Enfermedades Autoinmunes y Minoritarias, Servicio de Medicina Interna, Hospital Universitario de Navarra, Pamplona, España.
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Otaka Y, Kanai K, Okada D, Nagai N, Yamashita Y, Ichikawa Y, Tajima K. Effects of Oral 5-Aminolevulinic Acid on Lipopolysaccharide-Induced Ocular Inflammation in Rats. Vet Sci 2023; 10:vetsci10030207. [PMID: 36977246 PMCID: PMC10054159 DOI: 10.3390/vetsci10030207] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 03/03/2023] [Accepted: 03/06/2023] [Indexed: 03/12/2023] Open
Abstract
This study aimed to investigate the anti-inflammatory effect of 5-aminolevulinic acid (5-ALA) on endotoxin-induced uveitis (EIU) in rats. EIU was induced in male Sprague Dawley rats by the subcutaneous injection of lipopolysaccharide (LPS). During LPS injection, 5-ALA diluted with saline was administered via gastric gavage. After 24 h, clinical scores were assessed after which aqueous humor (AqH) samples were obtained. The number of infiltrating cells, protein concentration, and levels of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), nitric oxide (NO), and prostaglandin E2 (PGE2) in AqH were measured. For histological examination, both eyes of some rats were enucleated. In vitro, a mouse macrophage cell line (RAW264.7 cells) was stimulated by LPS with or without 5-ALA. Western blot was used to analyze the expression of inducible NO synthase (iNOS) and cyclooxygenase-2. 5-ALA suppressed the EIU clinical scores, infiltrating cell number, and protein concentration while improving the histopathologic scores. In particular, 100 mg/kg 5-ALA reduced the concentrations of NO, PGE2, TNF-α, and IL-6 in AqH, similar to 1 mg/kg prednisolone. In addition, 5-ALA suppressed iNOS upregulation in LPS-stimulated RAW264.7 cells. Therefore, 5-ALA has an anti-inflammatory effect on EIU through the inhibition of the upregulation of inflammatory mediators.
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Affiliation(s)
- Yuya Otaka
- Department of Small Animal Internal Medicine II, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23 ban-cho, Towada 034-8628, Aomori, Japan
| | - Kazutaka Kanai
- Department of Small Animal Internal Medicine II, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23 ban-cho, Towada 034-8628, Aomori, Japan
- Correspondence: ; Tel.: +81-176-23-4371
| | - Daiki Okada
- Department of Small Animal Internal Medicine II, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23 ban-cho, Towada 034-8628, Aomori, Japan
| | - Noriaki Nagai
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashiosaka 577-8502, Osaka, Japan
| | - Yohei Yamashita
- Department of Small Animal Internal Medicine II, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23 ban-cho, Towada 034-8628, Aomori, Japan
| | - Yoichiro Ichikawa
- Department of Small Animal Internal Medicine II, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23 ban-cho, Towada 034-8628, Aomori, Japan
| | - Kazuki Tajima
- Department of Small Animal Internal Medicine II, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23 ban-cho, Towada 034-8628, Aomori, Japan
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Parthasarathy R, Santiago F, McCluskey P, Kaakoush NO, Tedla N, Wakefield D. The microbiome in HLA-B27-associated disease: implications for acute anterior uveitis and recommendations for future studies. Trends Microbiol 2023; 31:142-158. [PMID: 36058784 DOI: 10.1016/j.tim.2022.08.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/09/2022] [Accepted: 08/09/2022] [Indexed: 01/27/2023]
Abstract
The pathogenesis of human leukocyte antigen (HLA)-B27-associated diseases such as acute anterior uveitis (AAU) and ankylosing spondylitis (AS) remains poorly understood, though Gram-negative bacteria and subclinical bowel inflammation are strongly implicated. Accumulating evidence from animal models and clinical studies supports several hypotheses, including HLA-B27-dependent dysbiosis, altered intestinal permeability, and molecular mimicry. However, the existing literature is hampered by inadequate studies designed to establish causation or uncover the role of viruses and fungi. Moreover, the unique disease model afforded by AAU to study the gut microbiota has been neglected. This review critically evaluates the current literature and prevailing hypotheses on the link between the gut microbiota and HLA-B27-associated disease. We propose a new potential role for HLA-B27-driven altered antibody responses to gut microbiota in disease pathogenesis and outline recommendations for future well-controlled human studies, focusing on AAU.
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Affiliation(s)
- Rohit Parthasarathy
- School of Medical Sciences, Faculty of Medicine & Health, UNSW, Sydney, Australia
| | - Fernando Santiago
- School of Medical Sciences, Faculty of Medicine & Health, UNSW, Sydney, Australia
| | - Peter McCluskey
- Save Sight Institute, Sydney Eye Hospital, Sydney, Australia; Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Nadeem O Kaakoush
- School of Medical Sciences, Faculty of Medicine & Health, UNSW, Sydney, Australia
| | - Nicodemus Tedla
- School of Medical Sciences, Faculty of Medicine & Health, UNSW, Sydney, Australia
| | - Denis Wakefield
- School of Medical Sciences, Faculty of Medicine & Health, UNSW, Sydney, Australia; Center for Immunology and Immunopathology, South Eastern Area Health Service, Sydney, Australia.
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21
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Pezzino S, Sofia M, Greco LP, Litrico G, Filippello G, Sarvà I, La Greca G, Latteri S. Microbiome Dysbiosis: A Pathological Mechanism at the Intersection of Obesity and Glaucoma. Int J Mol Sci 2023; 24:ijms24021166. [PMID: 36674680 PMCID: PMC9862076 DOI: 10.3390/ijms24021166] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 01/11/2023] Open
Abstract
The rate at which obesity is becoming an epidemic in many countries is alarming. Obese individuals have a high risk of developing elevated intraocular pressure and glaucoma. Additionally, glaucoma is a disease of epidemic proportions. It is characterized by neurodegeneration and neuroinflammation with optic neuropathy and the death of retinal ganglion cells (RGC). On the other hand, there is growing interest in microbiome dysbiosis, particularly in the gut, which has been widely acknowledged to play a prominent role in the etiology of metabolic illnesses such as obesity. Recently, studies have begun to highlight the fact that microbiome dysbiosis could play a critical role in the onset and progression of several neurodegenerative diseases, as well as in the development and progression of several ocular disorders. In obese individuals, gut microbiome dysbiosis can induce endotoxemia and systemic inflammation by causing intestinal barrier malfunction. As a result, bacteria and their metabolites could be delivered via the bloodstream or mesenteric lymphatic vessels to ocular regions at the level of the retina and optic nerve, causing tissue degeneration and neuroinflammation. Nowadays, there is preliminary evidence for the existence of brain and intraocular microbiomes. The altered microbiome of the gut could perturb the resident brain-ocular microbiome ecosystem which, in turn, could exacerbate the local inflammation. All these processes, finally, could lead to the death of RGC and neurodegeneration. The purpose of this literature review is to explore the recent evidence on the role of gut microbiome dysbiosis and related inflammation as common mechanisms underlying obesity and glaucoma.
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Affiliation(s)
- Salvatore Pezzino
- Department of Surgical Sciences and Advanced Technologies “G. F. Ingrassia”, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
| | - Maria Sofia
- Department of Surgical Sciences and Advanced Technologies “G. F. Ingrassia”, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
| | - Luigi Piero Greco
- Department of Surgical Sciences and Advanced Technologies “G. F. Ingrassia”, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
| | - Giorgia Litrico
- Department of Surgical Sciences and Advanced Technologies “G. F. Ingrassia”, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
| | - Giulia Filippello
- Complex Operative Unit of Ophtalmology, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
| | - Iacopo Sarvà
- Department of Surgical Sciences and Advanced Technologies “G. F. Ingrassia”, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
| | - Gaetano La Greca
- Department of Surgical Sciences and Advanced Technologies “G. F. Ingrassia”, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
| | - Saverio Latteri
- Department of Surgical Sciences and Advanced Technologies “G. F. Ingrassia”, Cannizzaro Hospital, University of Catania, 95126 Catania, Italy
- Correspondence: ; Tel.: +39-0957263584
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22
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Qin G, Chao C, Lattery LJ, Lin H, Fu W, Richdale K, Cai C. Tear proteomic analysis of young glasses, orthokeratology, and soft contact lens wearers. J Proteomics 2023; 270:104738. [PMID: 36191803 DOI: 10.1016/j.jprot.2022.104738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 09/01/2022] [Accepted: 09/06/2022] [Indexed: 02/01/2023]
Abstract
Contact lens-related ocular surface complications occur more often in teenagers and young adults. The purpose of this study was to determine changes in tear proteome of young patients wearing glasses (GL), orthokeratology lenses (OK), and soft contact lenses (SCL). Twenty-two young subjects (10-26 years of age) who were established GL, OK, and SCL wearers were recruited. Proteomic data were collected using a data-independent acquisition-parallel accumulation serial fragmentation workflow. In total, 3406 protein groups were identified, the highest number of proteins identified in Schirmer strip tears to date. Eight protein groups showed higher abundance, and 11 protein groups showed lower abundance in the SCL group compared to the OK group. In addition, the abundance of 82 proteins significantly differed in children compared to young adult GL wearers, among which 67 proteins were higher, and 15 proteins were lower in children. These 82 proteins were involved in inflammation, immune, and glycoprotein metabolic biological processes. In summary, this work identified over 3000 proteins in Schirmer Strip tears. The results indicated that tear proteomes were altered by orthokeratology and soft contact wear and age, which warrants further larger-scale study on the ocular surface responses of teenagers and young adults separately to contact lens wear. SIGNIFICANCE: In this work, we examined the tear proteomes of young patients wearing glasses, orthokeratology lenses, and soft contact lenses using a data-independent acquisition-parallel accumulation serial fragmentation (diaPASEF) workflow and identified 3406 protein groups in Schirmer strip tears. Nineteen protein groups showed significant abundance changes between orthokeratology and soft contact lens wearers. Moreover, eighty-two protein groups significantly differed in abundance in children and young adult glasses wearers. As a pilot study, this work provides a deep coverage of tear proteome and suggests the need to investigate ocular responses to contact lens wear separately for children and young adults.
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Affiliation(s)
- Guoting Qin
- College of Optometry, University of Houston, Houston, TX 77204, United States of America; Mass Spectrometry Laboratory, Department of Chemistry, University of Houston, Houston, TX 77204, United States of America.
| | - Cecilia Chao
- College of Optometry, University of Houston, Houston, TX 77204, United States of America; School of Optometry and Vision Science, University of New South Wales, Sydney, NSW 2023, Australia
| | - Lauren J Lattery
- College of Optometry, University of Houston, Houston, TX 77204, United States of America
| | - Hong Lin
- Department of Computer Science & Engineering Technology, University of Houston - Downtown, Houston, TX 77002, United States of America
| | - Wenjiang Fu
- Department of Mathematics, University of Houston, Houston, TX 77204, United States of America
| | - Kathryn Richdale
- College of Optometry, University of Houston, Houston, TX 77204, United States of America
| | - Chengzhi Cai
- Mass Spectrometry Laboratory, Department of Chemistry, University of Houston, Houston, TX 77204, United States of America.
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23
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Xu H, Chen M. Immune response in retinal degenerative diseases - Time to rethink? Prog Neurobiol 2022; 219:102350. [PMID: 36075351 DOI: 10.1016/j.pneurobio.2022.102350] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 08/24/2022] [Accepted: 09/02/2022] [Indexed: 11/30/2022]
Abstract
Retinal degeneration comprises a group of diseases whereby either the retinal neurons or the neurovascular unit degenerates leading to the loss of visual function. Although the initial cause varies in different conditions, inflammation is known to play an important role in disease pathogenesis. Recent advances in molecular and cell biology and systems biology have yielded unexpected findings, including the heterogeneity of immune cells in the degenerative retina, bidirectional neuron-microglia cross talk, and links to the gut microbiome. Here we discuss the immune response in retinal degenerative conditions, taking into account both regional (retinal) and systemic factors. We propose to classify retinal degeneration into dry and wet forms based on whether the blood-retinal barrier (BRB) is breached and fluid is accumulated in retinal parenchyma. The dry form has a relatively intact BRB and is characterised by progressive retinal thinning. Immune response to degenerative insults is dominated by the retinal defence system, which remains to be regulated by neurons. In contrast, the wet form has retinal oedema due to BRB damaged. Inflammation is executed by infiltrating immune cells as well as the retinal defence system. The gut microbiome will have easy access to the retina in wet retinal degeneration and may affect significantly retinal immune response.
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Affiliation(s)
- Heping Xu
- Aier Institute of Optometry and Vision Science, Changsha 410000, China; The Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Sciences, Queen's University Belfast, BT9 7BL, UK.
| | - Mei Chen
- The Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Sciences, Queen's University Belfast, BT9 7BL, UK.
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24
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Petrillo F, Petrillo A, Sasso FP, Schettino A, Maione A, Galdiero M. Viral Infection and Antiviral Treatments in Ocular Pathologies. Microorganisms 2022; 10:2224. [PMID: 36363815 PMCID: PMC9694090 DOI: 10.3390/microorganisms10112224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/04/2022] [Accepted: 11/07/2022] [Indexed: 08/27/2023] Open
Abstract
Ocular viral infections are common and widespread globally. These infectious diseases are a major cause of acute red eyes and vision loss. The eye and its nearby tissues can be infected by several viral agents, causing infections with a short course and limited ocular implications or a long clinical progression and serious consequences for the function and structure of the ocular region. Several surveillance studies underline the increased emergence of drug resistance among pathogenic viral strains, limiting treatment options for these infections. Currently, in the event of resistant infections, topical or systemic corticosteroids are useful in the management of associated immune reactions in the eye, which contribute to ocular dysfunction. Many cases of viral eye infections are misdiagnosed as being of bacterial origin. In these cases, therapy begins late and is not targeted at the actual cause of the infection, often leading to severe ocular compromises, such as corneal infiltrates, conjunctival scarring, and reduced visual acuity. The present study aims at a better understanding of the viral pathogens that cause eye infections, along with the treatment options available.
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Affiliation(s)
- Francesco Petrillo
- Azienda Ospedaliera Universitaria-Città della Salute e della Scienza di Torino, 10126 Torino, Italy
| | | | | | - Antonietta Schettino
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
| | - Angela Maione
- Department of Biology, University of Naples Federico II, 80126 Naples, Italy
| | - Marilena Galdiero
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
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25
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Cavuoto KM, Zhu AY. The Role of the Ocular Surface Microbiome (OSM) in Diseases of the Anterior Segment and Ocular Surface. CURRENT OPHTHALMOLOGY REPORTS 2022. [DOI: 10.1007/s40135-022-00294-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Borroni D, Paytuví-Gallart A, Sanseverino W, Gómez-Huertas C, Bonci P, Romano V, Giannaccare G, Rechichi M, Meduri A, Oliverio GW, Rocha-de-Lossada C. Exploring the Healthy Eye Microbiota Niche in a Multicenter Study. Int J Mol Sci 2022; 23:ijms231810229. [PMID: 36142138 PMCID: PMC9499403 DOI: 10.3390/ijms231810229] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 08/30/2022] [Accepted: 08/31/2022] [Indexed: 12/16/2022] Open
Abstract
Purpose: This study aims to explore and characterize healthy eye microbiota. Methods: Healthy subjects older than 18 years were selected for this descriptive cross-sectional study. Samples were collected with an eSwab with 1 mL of Liquid Amies Medium (Copan Brescia, Italy). Following DNA extraction, libraries preparation, and amplification, PCR products were purified and end-repaired for barcode ligation. Libraries were pooled to a final concentration of 26 pM. Template preparation was performed with Ion Chef according to Ion 510, Ion 520, and Ion 530 Kit-Chef protocol. Sequencing of the amplicon libraries was carried out on a 520 or 530 chip using the Ion Torrent S5 system (Thermo Fisher; Waltham, MA, USA). Raw reads were analyzed with GAIA (v 2.02). Results: Healthy eye microbiota is a low-diversity microbiome. The vast majority of the 137 analyzed samples were highly enriched with Staphylococcus, whereas only in a few of them, other genera such as Bacillus, Pseudomonas, and Corynebacterium predominate. We found an average of 88 genera with an average Shannon index of 0.65. Conclusion: We identified nine different ECSTs. A better understanding of healthy eye microbiota has the potential to improve disease diagnosis and personalized regimens to promote health.
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Affiliation(s)
- Davide Borroni
- Department of Doctoral Studies, Riga Stradins University, LV-1007 Riga, Latvia
- Eyemetagenomics Ltd., 71–75, Shelton Street, Covent Garden, London WC2H 9JQ, UK
- Correspondence:
| | | | - Walter Sanseverino
- Sequentia Biotech SL, Carrer del Dr. Trueta, 179, 08005 Barcelona, Spain
| | - Carmen Gómez-Huertas
- Department of Ophthalmology, Hospital Universitario Virgen de las Nieves, 18014 Granada, Spain
| | - Paola Bonci
- Ospedale Civile di Ravenna, Banca Delle Cornee Della Regione Emilia-Romagna, 48121 Ravenna, Italy
| | - Vito Romano
- Department of Medical and Surgical Specialties, Radiological Specialties and Public Health, 9297 University of Brescia, ASST Spedali Civili, 25100 Brescia, Italy
| | - Giuseppe Giannaccare
- Department of Ophthalmology, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
| | - Miguel Rechichi
- Centro Polispecialistico Mediterraneo, 88050 Sellia Marina, Italy
| | - Alessandro Meduri
- Biomedical Science Department, Institute of Ophthalmology, University of Messina, Via Consolare Valeria, 98146 Messina, Italy
| | - Giovanni William Oliverio
- Biomedical Science Department, Institute of Ophthalmology, University of Messina, Via Consolare Valeria, 98146 Messina, Italy
| | - Carlos Rocha-de-Lossada
- Eyemetagenomics Ltd., 71–75, Shelton Street, Covent Garden, London WC2H 9JQ, UK
- Department of Ophthalmology, Qvision (Vithas Almeria), 04120 Almería, Spain
- Hospital Regional Universitario de Malaga, 29010 Malaga, Spain
- Departamento de Cirugía, Área de Oftalmología, Universidad de Sevilla, 41004 Sevilla, Spain
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27
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Petrillo F, Petrillo A, Marrapodi M, Capristo C, Gicchino MF, Montaldo P, Caredda E, Reibaldi M, Boatti LMV, Dell’Annunziata F, Folliero V, Galdiero M. Characterization and Comparison of Ocular Surface Microbiome in Newborns. Microorganisms 2022; 10:microorganisms10071390. [PMID: 35889110 PMCID: PMC9320102 DOI: 10.3390/microorganisms10071390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/29/2022] [Accepted: 07/06/2022] [Indexed: 12/10/2022] Open
Abstract
The ocular microbiome is of fundamental importance for immune eye homeostasis, and its alteration would lead to an impairment of ocular functionality. Little evidence is reported on the composition of the ocular microbiota of term infants and on the impact of antibiotic prophylaxis. Methods: A total of 20 conjunctival swabs were collected from newborns at birth and after antibiotic treatment. Samples were subjected to 16S rRNA sequencing via system MiSeq Illumina. The data were processed with the MicrobAT software and statistical analysis were performed using two-way ANOVA. Results: Antibiotic prophylaxis with gentamicin altered the composition of the microbiota. In detail, a 1.5- and 2.01-fold reduction was recorded for Cutibacterium acnes (C. acnes) and Massilia timonae (M. timonae), respectively, whereas an increase in Staphylococcus spp. of 6.5 times occurred after antibiotic exposure. Conclusions: Antibiotic prophylaxis altered the ocular microbiota whose understanding could avoid adverse effects on eye health.
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Affiliation(s)
- Francesco Petrillo
- Department of Surgical Sciences, Eye Clinic Section, University of Turin, 10124 Turin, Italy; (F.P.); (M.R.)
| | - Arianna Petrillo
- Pediatric Unit, Fondazione IRCCS “Ca’ Granda-Ospedale Maggiore-Policlinico”, 20122 Milan, Italy;
| | - Maddalena Marrapodi
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, 80138 Napoli, Italy; (M.M.); (M.F.G.)
| | - Carlo Capristo
- Department of Neonatology, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (C.C.); (P.M.); (E.C.)
| | - Maria Francesca Gicchino
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, 80138 Napoli, Italy; (M.M.); (M.F.G.)
| | - Paolo Montaldo
- Department of Neonatology, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (C.C.); (P.M.); (E.C.)
| | - Elisabetta Caredda
- Department of Neonatology, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (C.C.); (P.M.); (E.C.)
| | - Michele Reibaldi
- Department of Surgical Sciences, Eye Clinic Section, University of Turin, 10124 Turin, Italy; (F.P.); (M.R.)
| | | | - Federica Dell’Annunziata
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (F.D.); (V.F.)
| | - Veronica Folliero
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (F.D.); (V.F.)
| | - Marilena Galdiero
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (F.D.); (V.F.)
- Correspondence:
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28
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Rodríguez-Fernández CA, Iglesias MB, de Domingo B, Conde-Pérez K, Vallejo JA, Rodríguez-Martínez L, González-Barcia M, Llorenç V, Mondelo-Garcia C, Poza M, Fernández-Ferreiro A. Microbiome in Immune-Mediated Uveitis. Int J Mol Sci 2022; 23:ijms23137020. [PMID: 35806031 PMCID: PMC9266430 DOI: 10.3390/ijms23137020] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 06/21/2022] [Accepted: 06/22/2022] [Indexed: 02/04/2023] Open
Abstract
In the last decades, personalized medicine has been increasing its presence in different fields of medicine, including ophthalmology. A new factor that can help us direct medicine towards the challenge of personalized treatments is the microbiome. The gut microbiome plays an important role in controlling immune response, and dysbiosis has been associated with immune-mediated diseases such as non-infectious uveitis (NIU). In this review, we gather the published evidence, both in the pre-clinical and clinical studies, that support the possible role of intestinal dysbiosis in the pathogenesis of NIU, as well as the modulation of the gut microbiota as a new possible therapeutic target. We describe the different mechanisms that have been proposed to involve dysbiosis in the causality of NIU, as well as the potential pharmacological tools that could be used to modify the microbiome (dietary supplementation, antibiotics, fecal microbiota transplantation, immunomodulators, or biologic drugs) and, consequently, in the control of the NIU. Furthermore, there is increasing scientific evidence suggesting that the treatment with anti-TNF not only restores the composition of the gut microbiota but also that the study of the composition of the gut microbiome will help predict the response of each patient to anti-TNF treatment.
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Affiliation(s)
| | - Manuel Busto Iglesias
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), 15706 Santiago de Compostela, Spain; (M.B.I.); (M.G.-B.); (C.M.-G.)
- Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), 15706 Santiago de Compostela, Spain;
| | - Begoña de Domingo
- Ophthalmology Department, University Clinical Hospital of Santiago Compostela (SERGAS), 15706 Santiago de Compostela, Spain;
| | - Kelly Conde-Pérez
- Microbiology Research Group: meiGAbiome, Biomedical Research Institute (INIBIC), Center for Advanced Research (CICA), University of A Coruña (UDC), CIBER of Infectious Diseases (CIBERINF), 15006 A Coruña, Spain; (K.C.-P.); (J.A.V.)
| | - Juan A. Vallejo
- Microbiology Research Group: meiGAbiome, Biomedical Research Institute (INIBIC), Center for Advanced Research (CICA), University of A Coruña (UDC), CIBER of Infectious Diseases (CIBERINF), 15006 A Coruña, Spain; (K.C.-P.); (J.A.V.)
| | - Lorena Rodríguez-Martínez
- Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), 15706 Santiago de Compostela, Spain;
| | - Miguel González-Barcia
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), 15706 Santiago de Compostela, Spain; (M.B.I.); (M.G.-B.); (C.M.-G.)
- Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), 15706 Santiago de Compostela, Spain;
| | - Victor Llorenç
- Clínic Institute of Ophthalmology (ICOF), Clinic Hospital of Barcelona, 08028 Barcelona, Spain;
- Biomedical Research Institute August Pi i Sunyer (IDIBAPS), Clínic Hospital of Barcelona, 08036 Barcelona, Spain
| | - Cristina Mondelo-Garcia
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), 15706 Santiago de Compostela, Spain; (M.B.I.); (M.G.-B.); (C.M.-G.)
- Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), 15706 Santiago de Compostela, Spain;
| | - Margarita Poza
- Microbiology Research Group: meiGAbiome, Biomedical Research Institute (INIBIC), Center for Advanced Research (CICA), University of A Coruña (UDC), CIBER of Infectious Diseases (CIBERINF), 15006 A Coruña, Spain; (K.C.-P.); (J.A.V.)
- Correspondence: (M.P.); (A.F.-F.)
| | - Anxo Fernández-Ferreiro
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), 15706 Santiago de Compostela, Spain; (M.B.I.); (M.G.-B.); (C.M.-G.)
- Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), 15706 Santiago de Compostela, Spain;
- Correspondence: (M.P.); (A.F.-F.)
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29
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Huang R, Su C, Fang L, Lu J, Chen J, Ding Y. Dry eye syndrome: comprehensive etiologies and recent clinical trials. Int Ophthalmol 2022; 42:3253-3272. [PMID: 35678897 PMCID: PMC9178318 DOI: 10.1007/s10792-022-02320-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 04/18/2022] [Indexed: 12/07/2023]
Abstract
Dry eye syndrome (DES) is multifactorial and likely to be a cause of concern more so than ever given the rapid pace of modernization, which is directly associated with many of the extrinsic causative factors. Additionally, recent studies have also postulated novel etiologies that may provide the basis for alternative treatment methods clinically. Such insights are especially important given that current approaches to tackle DES remains suboptimal. This review will primarily cover a comprehensive list of causes that lead to DES, summarize all the upcoming and ongoing clinical trials that focuses on treating this disease as well as discuss future potential treatments that can improve inclusivity.
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Affiliation(s)
- Ruojing Huang
- Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Huangpu Avenue West 613, Tianhe District, Guangzhou, 510630, China
| | - Caiying Su
- Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Huangpu Avenue West 613, Tianhe District, Guangzhou, 510630, China
| | - Lvjie Fang
- Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Huangpu Avenue West 613, Tianhe District, Guangzhou, 510630, China
| | - Jiaqi Lu
- Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Huangpu Avenue West 613, Tianhe District, Guangzhou, 510630, China
| | - Jiansu Chen
- Institute of Ophthalmology, Medical College, Jinan University, Huangpu Avenue West 601, Tianhe District, Guangzhou, 510632, China.
| | - Yong Ding
- Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Huangpu Avenue West 613, Tianhe District, Guangzhou, 510630, China.
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30
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Ren Z, Li W, Liu Q, Dong Y, Huang Y. Profiling of the Conjunctival Bacterial Microbiota Reveals the Feasibility of Utilizing a Microbiome-Based Machine Learning Model to Differentially Diagnose Microbial Keratitis and the Core Components of the Conjunctival Bacterial Interaction Network. Front Cell Infect Microbiol 2022; 12:860370. [PMID: 35558101 PMCID: PMC9086711 DOI: 10.3389/fcimb.2022.860370] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 03/28/2022] [Indexed: 12/29/2022] Open
Abstract
Both healthy and diseased human ocular surfaces possess their own microbiota. If allowed, opportunistic pathogens within the ocular microbiota may cause microbial keratitis (MK). However, the nonpathogenic component of the ocular microbiota has been proven to undermine the performance of culture, the gold standard of the etiological diagnosis for MK. As the conjunctival bacterial microbiota generates unique alterations with various oculopathies, this study aimed to evaluate the feasibility of distinguishing MK using machine learning based on the characteristics of the conjunctival bacterial microbiome associated with various types of MK. This study also aimed to reveal which bacterial genera constitute the core of the interaction network of the conjunctival bacterial microbiome. Conjunctival swabs collected from the diseased eyes of MK patients and the randomly chosen normal eyes of healthy volunteers were subjected for high-throughput 16S rDNA sequencing. The relative content of each bacterial genus and the composition of bacterial gene functions in every sample were used to establish identification models with the random forest algorithm. Tenfold cross validation was adopted. Accuracy was 96.25% using the bacterial microbiota structure and 93.75% using the bacterial gene functional composition. Therefore, machine learning with the conjunctival bacterial microbiome characteristics might be used for differentiation of MKs as a noninvasive supplementary approach. In addition, this study found that Actinobacteria, Lactobacillus, Clostridium, Helicobacter, and Sphingomonas constitute the core of the interaction network of the conjunctival bacterial microbiome.
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Affiliation(s)
- Zhichao Ren
- Qingdao University Medical College, Qingdao, China
- Qingdao Eye Hospital of Shandong First Medical University, Qingdao, China
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Eye Institute of Shandong First Medical University, Qingdao, China
| | - Wenfeng Li
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Qing Liu
- Qingdao Eye Hospital of Shandong First Medical University, Qingdao, China
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Eye Institute of Shandong First Medical University, Qingdao, China
| | - Yanling Dong
- Qingdao Eye Hospital of Shandong First Medical University, Qingdao, China
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Eye Institute of Shandong First Medical University, Qingdao, China
| | - Yusen Huang
- Qingdao Eye Hospital of Shandong First Medical University, Qingdao, China
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Eye Institute of Shandong First Medical University, Qingdao, China
- *Correspondence: Yusen Huang,
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Cytologic detection of
Simonsiella‐
like bacteria suggesting oral contamination in cases of canine ulcerative keratitis. VETERINARY RECORD CASE REPORTS 2022. [DOI: 10.1002/vrc2.373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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Wang S, Lei B, Zhang E, Gong P, Gu J, He L, Han L, Yuan Z. Targeted Therapy for Inflammatory Diseases with Mesenchymal Stem Cells and Their Derived Exosomes: From Basic to Clinics. Int J Nanomedicine 2022; 17:1757-1781. [PMID: 35469174 PMCID: PMC9034888 DOI: 10.2147/ijn.s355366] [Citation(s) in RCA: 53] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 04/09/2022] [Indexed: 12/13/2022] Open
Abstract
Inflammation is a beneficial and physiological process, but there are a number of inflammatory diseases which have detrimental effects on the body. In addition, the drugs used to treat inflammation have toxic side effects when used over a long period of time. Mesenchymal stem cells (MSCs) are pluripotent stem cells that can be isolated from a variety of tissues and can be differentiate into diverse cell types under appropriate conditions. They also exhibit noteworthy anti-inflammatory properties, providing new options for the treatment of inflammatory diseases. The therapeutic potential of MSCs is currently being investigated for various inflammatory diseases, such as kidney injury, lung injury, osteoarthritis (OA), rheumatoid arthritis (RA), and inflammatory bowel disease (IBD). MSCs can perform multiple functions, including immunomodulation, homing, and differentiation, to enable damaged tissues to form a balanced inflammatory and regenerative microenvironment under severe inflammatory conditions. In addition, accumulated evidence indicates that exosomes from extracellular vesicles of MSCs (MSC-Exos) play an extraordinary role, mainly by transferring their components to recipient cells. In this review, we summarize the mechanism and clinical trials of MSCs and MSC-Exos in various inflammatory diseases in detail, with a view to contributing to the treatment of MSCs and MSC-Exos in inflammatory diseases.
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Affiliation(s)
- Shuo Wang
- College of Pharmacy, Southwest Minzu University, Chengdu, 610041, Sichuan, People’s Republic of China
| | - Biyu Lei
- College of Pharmacy, Southwest Minzu University, Chengdu, 610041, Sichuan, People’s Republic of China
| | - E Zhang
- Department of Basic Sciences, Officers College of People’s Armed Police, Chengdu, Sichuan, 610213, People’s Republic of China
| | - Puyang Gong
- College of Pharmacy, Southwest Minzu University, Chengdu, 610041, Sichuan, People’s Republic of China
| | - Jian Gu
- College of Pharmacy, Southwest Minzu University, Chengdu, 610041, Sichuan, People’s Republic of China
| | - Lili He
- College of Pharmacy, Southwest Minzu University, Chengdu, 610041, Sichuan, People’s Republic of China
| | - Lu Han
- College of Pharmacy, Southwest Minzu University, Chengdu, 610041, Sichuan, People’s Republic of China
| | - Zhixiang Yuan
- College of Pharmacy, Southwest Minzu University, Chengdu, 610041, Sichuan, People’s Republic of China
- Correspondence: Zhixiang Yuan; Lu Han, Email ;
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Comment on Kopańska et al. Disorders of the Cholinergic System in COVID-19 Era—A Review of the Latest Research. Int. J. Mol. Sci. 2022, 23, 672. Int J Mol Sci 2022; 23:ijms23052818. [PMID: 35269960 PMCID: PMC8910927 DOI: 10.3390/ijms23052818] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 02/24/2022] [Indexed: 12/19/2022] Open
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34
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Xu H, Rao NA. Grand Challenges in Ocular Inflammatory Diseases. FRONTIERS IN OPHTHALMOLOGY 2022; 2:756689. [PMID: 38983535 PMCID: PMC11182270 DOI: 10.3389/fopht.2022.756689] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 01/27/2022] [Indexed: 07/11/2024]
Affiliation(s)
- Heping Xu
- The Wellcome-Wolfson Institute for Experimental Medicine, Queen’s University Belfast, Belfast, United Kingdom
- Aier Institute of Optometry and Vision Science, Changsha, China
| | - Narsing A. Rao
- Department of Ophthalmology, USC-Roski Eye Institute, Los Angeles, CA, United States
- Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
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35
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Xue W, Li JJ, Zou Y, Zou B, Wei L. Microbiota and Ocular Diseases. Front Cell Infect Microbiol 2021; 11:759333. [PMID: 34746029 PMCID: PMC8566696 DOI: 10.3389/fcimb.2021.759333] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 10/06/2021] [Indexed: 12/12/2022] Open
Abstract
Recent advances have identified significant associations between the composition and function of the gut microbiota and various disorders in organ systems other than the digestive tract. Utilizing next-generation sequencing and multiomics approaches, the microbial community that possibly impacts ocular disease has been identified. This review provides an overview of the literature on approaches to microbiota analysis and the roles of commensal microbes in ophthalmic diseases, including autoimmune uveitis, age-related macular degeneration, glaucoma, and other ocular disorders. In addition, this review discusses the hypothesis of the "gut-eye axis" and evaluates the therapeutic potential of targeting commensal microbiota to alleviate ocular inflammation.
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Affiliation(s)
- Wei Xue
- State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Jing Jing Li
- State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Yanli Zou
- State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China.,Department of Ophthalmology, Affiliated Foshan Hospital, Southern Medical University, Foshan, China
| | - Bin Zou
- State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Lai Wei
- State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
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Goldstein MR, Cheslock M. On the prevention and treatment of Alzheimer's disease: Control the promoters and look beyond the brain. Med Hypotheses 2021; 154:110645. [PMID: 34315048 DOI: 10.1016/j.mehy.2021.110645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 06/05/2021] [Accepted: 07/13/2021] [Indexed: 11/18/2022]
Abstract
Alzheimer's disease (AD) is a progressive incurable neurodegenerative disease of the brain afflicting a third of the population aged 85 and older. Pathologic hallmarks include extracellular plaques of amyloid-beta (Aß), intraneuronal neurofibrillary tangles of hyperphosphorylated tau protein, synaptic destruction, neuronal death, and brain atrophy. Neuroinflammation, mediated by microglia, is a central component of the disease, and is intricately connected with peripheral inflammation. The clinical manifestations include progressive memory loss and eventual death. The present treatment of AD is largely ineffective. Nearly all AD is late-onset and presents age 65 or older, and the most common genetic risk factor is carriage of an apolipoprotein (APO) E4 allele, seen in about 25% of the general population. Individuals carrying an APOE4 allele produce more Aß and clear it less efficiently from the brain throughout life. There has been accumulating pathologic and clinical evidence that microbes, particularly the herpes simplex virus (HSV), is a causative factor for AD, most notable in carriers of the APOE4 allele. Eighty percent of the adult population harbors HSV and it resides in the trigeminal ganglion in latent state throughout life, but periodically reactivates, traveling antegrade resulting in herpes labialis and traveling retrograde into the brain leading to neuroinflammation. Functioning as an antimicrobial peptide, Aß inactivates HSV and the recurring process culminates in a buildup of Aß plaque and other hallmarks of AD over time. Periodontal disease exists in 20-50% of the adult population and is also a causative factor for AD. Accordingly, bacteria causing periodontal disease and their byproducts can enter the brain directly via the trigeminal nerve or indirectly through the bloodstream, resulting in AD pathology over time. There are many other promoters of AD, particularly inflammatory conditions outside of the brain, that can be mitigated. Small trials are finally in progress testing antimicrobial drugs for the prevention and treatment of AD. In the meantime, a more proactive approach to the prevention and treatment of AD is posited, with an emphasis on prevention, since the pathologic underpinnings of the disease start decades before the clinical manifestations. Individuals can be stratified in risk categories using family history, periodontal disease presence, APOE4 carriage, and HSV IgG positivity. Moderate- and high-risk individuals can be treated safely with various preventive measures and appropriate antimicrobial agents as discussed. Importantly, the proposed treatments are concordant with the accepted practice of medicine, and if utilized, could significantly decrease AD prevalence.
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Affiliation(s)
| | - Megan Cheslock
- Harvard Medical School Multi-Campus Geriatric Fellowship, Boston, Massachusetts, USA.
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Postbiotic Supplementation for Children and Newborn's Health. Nutrients 2021; 13:nu13030781. [PMID: 33673553 PMCID: PMC7997220 DOI: 10.3390/nu13030781] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 02/21/2021] [Accepted: 02/24/2021] [Indexed: 12/15/2022] Open
Abstract
It is now well known how the microbiota can positively or negatively influence humans health, depending on its composition. The microbiota's countless beneficial effects have allowed it to be defined as a genuine symbiont for our species. In an attempt to positively influence the microbiota, research has focused on probiotics and prebiotics. Probiotics are viable beneficial bacteria of various strains. Prebiotics are specific substances able to favor the development of advantageous bacteria strains. Postbiotics are a new category of compounds capable of affecting the microbiota. According to the different definitions, postbiotics include both nonviable bacteria and substances deriving from bacterial metabolism. Postbiotics are particularly promising in pediatric settings, as they offer some advantages over probiotics, including the absence of the risk of intestinal translocation or worsening of local inflammation. For these reasons, their use in fragile population categories such as newborns, and even more prematures, seems to be the best solution for improving microbiota's health in this population. This narrative review aims to collect the research conducted so far on postbiotics' potential in the first stages of life.
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