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Parrott AC, Coburn PS, Miller FC, LaGrow AL, Mursalin MH, Callegan MC. The Role of CCL Chemokines in Experimental Staphylococcus aureus Endophthalmitis. Invest Ophthalmol Vis Sci 2024; 65:12. [PMID: 38842829 PMCID: PMC11160947 DOI: 10.1167/iovs.65.6.12] [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: 03/28/2024] [Accepted: 05/14/2024] [Indexed: 06/07/2024] Open
Abstract
Purpose To test the hypothesis that (C-C motif) ligand 2 (CCL2) and CCL3 impact retinal function decline and inflammation during Staphylococcus aureus endophthalmitis. Methods Experimental endophthalmitis was initiated by intravitreal injection of 5000 colony-forming units of S. aureus into the eyes of C57BL/6J, CCL2-/-, or CCL3-/- mice. At 12 and 24 hours post-infection, retinal function, bacterial load, and myeloperoxidase levels were quantified. Results During S. aureus endophthalmitis, we observed a significant improvement in retinal function in CCL2-/- mice relative to C57BL/6J mice at 12 hours but not at 24 hours. In CCL3-/- mice, retinal function was significantly improved relative to C57BL/6J mice at 12 and 24 hours. The absence of CCL2 did not alter intraocular S. aureus intraocular concentrations. However, CCL3-/- mice had significantly lower intraocular S. aureus at 12 hours but not at 24 hours. No difference in myeloperoxidase levels was observed between C57BL/6J and CCL2-/- mice at 12 hours. CCL3-/- mice had almost no myeloperoxidase at 12 hours. At 24 hours, increased myeloperoxidase was observed in CCL2-/- and CCL3-/- mice relative to C57BL/6J mice. Conclusions Although the absence of CCL2 resulted in improved retinal function retention at 12 hours, CCL3 deficiency resulted in improved retinal function at 12 and 24 hours. CCL3 deficiency, but not CCL2 deficiency, resulted in almost no inflammation at 12 hours. However, at 24 hours, the absence of CCL2 or CCL3 resulted in significantly increased inflammation. These results suggest that, although both CCL2 and CCL3 impact intraocular infection outcomes, CCL3 may have a more significant impact in S. aureus endophthalmitis.
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Affiliation(s)
- Aaron C. Parrott
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Phillip S. Coburn
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Frederick C. Miller
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
- Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Austin L. LaGrow
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Md Huzzatul Mursalin
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Michelle C. Callegan
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
- Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
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Hu A, Xiao F, Wu W, Xu H, Su J. LincRNA-EPS inhibits caspase-11 and NLRP3 inflammasomes in gingival fibroblasts to alleviate periodontal inflammation. Cell Prolif 2024; 57:e13539. [PMID: 37710420 PMCID: PMC10771112 DOI: 10.1111/cpr.13539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 07/21/2023] [Accepted: 08/14/2023] [Indexed: 09/16/2023] Open
Abstract
To investigate the effects of long intergenic noncoding RNA-erythroid prosurvival (lincRNA-EPS) on periodontal inflammation mediated by inflammasomes and to explore its mechanism. Experimental periodontitis was induced in KO (lincRNA-EPS-/- ) and WT (lincRNA-EPS+/+ ) mice to compare the periodontal bone loss and inflammation by using micro-computed tomography, immunofluorescence staining and haematoxylin and eosin staining. The expression and activation of cysteinyl aspartate-specific proteinase-11 (caspase-11) and NOD-like receptor protein 3 (NLRP3) inflammasomes, as well as nuclear factor-kappa B (NF-κB) activation in mouse gingival fibroblasts (MGFs), were measured by real-time quantitative polymerase chain reaction, Western blotting, enzyme-linked immunosorbent and lactate dehydrogenase assays. MGFs were transfected with overexpression plasmids to assess the biological functions of lincRNA-EPS. RNA pull-down and immunoprecipitation experiments were performed to identify the interacting protein of lincRNA-EPS. LincRNA-EPS-expressing lentivirus was locally administered to inflamed periodontal tissues to evaluate its salvage function in periodontitis. The absence of lincRNA-EPS increased bone loss and expression of myeloperoxidase, interleukin-1α (IL-1α) and IL-1β in the inflammatory periodontium. LincRNA-EPS KO MGFs exhibited increased expression and activation of caspase-11/NLRP3 inflammasome components than WT MGFs under lipopolysaccharide (LPS) stimulation. The expression and activation of these molecules were inhibited in lincRNA-EPS overexpressed MGFs. Mechanistically, lincRNA-EPS directly bound to transactive response DNA-binding protein 43 (TDP43) in the nucleus of MGFs, and TDP43 knockdown exerted a similar inhibitory effect on NF-κB activation and the inflammasomes as lincRNA-EPS overexpression. Locally injecting lincRNA-EPS-expressing lentivirus weakened the periodontal damage. LincRNA-EPS inhibits the LPS-induced production and activation of caspase-11 and NLRP3 inflammasomes by suppressing the activation of the NF-κB signalling pathway via interacting with TDP43, thereby alleviating periodontitis.
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Affiliation(s)
- Anni Hu
- Department of ProsthodonticsStomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and RegenerationShanghaiChina
| | - Fan Xiao
- Department of ProsthodonticsStomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and RegenerationShanghaiChina
| | - Wenjing Wu
- Department of ProsthodonticsStomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and RegenerationShanghaiChina
| | - Huilin Xu
- Department of ProsthodonticsStomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and RegenerationShanghaiChina
| | - Jiansheng Su
- Department of ProsthodonticsStomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and RegenerationShanghaiChina
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Coburn PS, Miller FC, LaGrow AL, Mursalin H, Gregory A, Parrott A, Astley D, Callegan MC. Virulence-related genotypic differences among Bacillus cereus ocular and gastrointestinal isolates and the relationship to endophthalmitis pathogenesis. Front Cell Infect Microbiol 2023; 13:1304677. [PMID: 38106476 PMCID: PMC10722173 DOI: 10.3389/fcimb.2023.1304677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 11/03/2023] [Indexed: 12/19/2023] Open
Abstract
Background Bacillus cereus (Bc) can cause self-limiting gastrointestinal infections, but when infecting the eye, can cause rapid and irreversible blindness. This study investigated whether clinical ocular and gastrointestinal Bc isolates differed in terms of virulence-related genotypes and endophthalmitis virulence. Methods Twenty-eight Bc ocular, gastrointestinal, and laboratory reference isolates were evaluated. Hemolysis assays were performed to assess potential differences in hemolytic activity. The presence of twenty Bc virulence-related genes was assessed by PCR. A subset of ocular and gastrointestinal isolates differing in PCR positivity for 5 virulence genes was compared to strain ATCC14579 in an experimental murine model of endophthalmitis. At 8 hours post infection, retinal function was evaluated by electroretinography, and intraocular bacterial concentrations were determined by plate counts. Results Gastrointestinal Bc isolates were more hemolytic than the Bc ocular isolates and ATCC14579 (p < 0.0001). Bc ocular isolates were more frequently PCR-positive for capK, cytK, hblA, hblC, and plcR compared to the gastrointestinal isolates (p ≤ 0.0002). In the endophthalmitis model, mean A-wave retention did not differ significantly between eyes infected with ATCC14579 and eyes infected with the selected ocular or gastrointestinal isolates (p ≥ 0.3528). Similar results were observed for mean B-wave retention (p ≥ 0.0640). Only one diarrheal isolate showed significantly greater B-wave retention when compared to ATCC14579 (p = 0.0303). No significant differences in mean A-wave (p ≥ 0.1535) or B-wave (p ≥ 0.0727) retention between the selected ocular and gastrointestinal isolates were observed. Intraocular concentrations of ATCC14579 were significantly higher than the selected ocular isolate and 3 of the gastrointestinal isolates (p ≤ 0.0303). Intraocular concentrations of the selected ocular isolate were not significantly different from the gastrointestinal isolates (p ≥ 0.1923). Conclusions Among the subset of virulence-related genes assessed, 5 were significantly enriched among the ocular isolates compared to gastrointestinal isolates. While hemolytic activity was higher among gastrointestinal isolates, retinal function retention and intraocular growth was not significantly different between the selected ocular and gastrointestinal isolates. These results suggest that Bc strains causing gastrointestinal infections, while differing from ocular isolates in hemolytic activity and virulence-related gene profile, are similarly virulent in endophthalmitis.
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Affiliation(s)
- Phillip S. Coburn
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Frederick C. Miller
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Austin L. LaGrow
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Huzzatul Mursalin
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Anna Gregory
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Aaron Parrott
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Daniel Astley
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Michelle C. Callegan
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Dean McGee Eye Institute, Oklahoma City, OK, United States
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Wang X, Wang T, Lam E, Alvarez D, Sun Y. Ocular Vascular Diseases: From Retinal Immune Privilege to Inflammation. Int J Mol Sci 2023; 24:12090. [PMID: 37569464 PMCID: PMC10418793 DOI: 10.3390/ijms241512090] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/21/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023] Open
Abstract
The eye is an immune privileged tissue that insulates the visual system from local and systemic immune provocation to preserve homeostatic functions of highly specialized retinal neural cells. If immune privilege is breached, immune stimuli will invade the eye and subsequently trigger acute inflammatory responses. Local resident microglia become active and release numerous immunological factors to protect the integrity of retinal neural cells. Although acute inflammatory responses are necessary to control and eradicate insults to the eye, chronic inflammation can cause retinal tissue damage and cell dysfunction, leading to ocular disease and vision loss. In this review, we summarized features of immune privilege in the retina and the key inflammatory responses, factors, and intracellular pathways activated when retinal immune privilege fails, as well as a highlight of the recent clinical and research advances in ocular immunity and ocular vascular diseases including retinopathy of prematurity, age-related macular degeneration, and diabetic retinopathy.
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Affiliation(s)
- Xudong Wang
- Department of Ophthalmology, Harvard Medical School, Boston Children’s Hospital, Boston, MA 02115, USA; (X.W.)
| | - Tianxi Wang
- Department of Ophthalmology, Harvard Medical School, Boston Children’s Hospital, Boston, MA 02115, USA; (X.W.)
| | - Enton Lam
- Department of Ophthalmology, Harvard Medical School, Boston Children’s Hospital, Boston, MA 02115, USA; (X.W.)
| | - David Alvarez
- Department of Immunology, Harvard Medical School, Boston, MA 02115, USA
| | - Ye Sun
- Department of Ophthalmology, Harvard Medical School, Boston Children’s Hospital, Boston, MA 02115, USA; (X.W.)
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5
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Monickaraj F, Acosta G, Cabrera AP, Das A. Transcriptomic Profiling Reveals Chemokine CXCL1 as a Mediator for Neutrophil Recruitment Associated With Blood-Retinal Barrier Alteration in Diabetic Retinopathy. Diabetes 2023; 72:781-794. [PMID: 36930735 PMCID: PMC10202768 DOI: 10.2337/db22-0619] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 02/12/2023] [Indexed: 03/19/2023]
Abstract
Inflammation plays an important role in the pathogenesis of diabetic retinopathy (DR). To precisely define the inflammatory mediators, we examined the transcriptomic profile of human retinal endothelial cells exposed to advanced glycation end products, which revealed the neutrophil chemoattractant chemokine CXCL1 as one of the top genes upregulated. The effect of neutrophils in the alteration of the blood-retinal barrier (BRB) was further assessed in wild-type C57BL/6J mice intravitreally injected with recombinant CXCL1 as well as in streptozotocin-induced diabetic mice. Both intravitreally CXCL1-injected and diabetic animals showed significantly increased retinal vascular permeability, with significant increase in infiltration of neutrophils and monocytes in retinas and increased expression of chemokines and their receptors, proteases, and adhesion molecules. Treatment with Ly6G antibody for neutrophil depletion in both diabetic mice as well as CXCL1-injected animals showed significantly decreased retinal vascular permeability accompanied by decreased infiltration of neutrophils and monocytes and decreased expression of cytokines and proteases. CXCL1 level was significantly increased in the serum samples of patients with DR compared with samples of those without diabetes. These data reveal a novel mechanism by which the chemokine CXCL1, through neutrophil recruitment, alters the BRB in DR and, thus, serves as a potential novel therapeutic target. ARTICLE HIGHLIGHTS Intravitreal CXCL1 injection and diabetes result in increased retinal vascular permeability with neutrophil and monocyte recruitment. Ly6G antibody treatment for neutrophil depletion in both animal models showed decreased retinal permeability and decreased cytokine expression. CXCL1 is produced by retinal endothelial cells, pericytes, and astrocytes. CXCL1 level is significantly increased in serum samples of patients with diabetic retinopathy. CXCL1, through neutrophil recruitment, alters the blood-retinal barrier in diabetic retinopathy and, thus, may be used as a therapeutic target.
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Affiliation(s)
- Finny Monickaraj
- Ophthalmology and Visual Sciences, University of New Mexico, Albuquerque, NM
- New Mexico VA Health Care System, Albuquerque, NM
| | - Gabriella Acosta
- Ophthalmology and Visual Sciences, University of New Mexico, Albuquerque, NM
| | - Andrea P. Cabrera
- Ophthalmology and Visual Sciences, University of New Mexico, Albuquerque, NM
| | - Arup Das
- Ophthalmology and Visual Sciences, University of New Mexico, Albuquerque, NM
- New Mexico VA Health Care System, Albuquerque, NM
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6
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Kaur G, Sharma D, Bisen S, Mukhopadhyay CS, Gurdziel K, Singh NK. Vascular cell-adhesion molecule 1 (VCAM-1) regulates JunB-mediated IL-8/CXCL1 expression and pathological neovascularization. Commun Biol 2023; 6:516. [PMID: 37179352 PMCID: PMC10183029 DOI: 10.1038/s42003-023-04905-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 05/02/2023] [Indexed: 05/15/2023] Open
Abstract
Vascular adhesion molecules play an important role in various immunological disorders, particularly in cancers. However, little is known regarding the role of these adhesion molecules in proliferative retinopathies. We observed that IL-33 regulates VCAM-1 expression in human retinal endothelial cells and that genetic deletion of IL-33 reduces hypoxia-induced VCAM-1 expression and retinal neovascularization in C57BL/6 mice. We found that VCAM-1 via JunB regulates IL-8 promoter activity and expression in human retinal endothelial cells. In addition, our study outlines the regulatory role of VCAM-1-JunB-IL-8 signaling on retinal endothelial cell sprouting and angiogenesis. Our RNA sequencing results show an induced expression of CXCL1 (a murine functional homolog of IL-8) in the hypoxic retina, and intravitreal injection of VCAM-1 siRNA not only decreases hypoxia-induced VCAM-1-JunB-CXCL1 signaling but also reduces OIR-induced sprouting and retinal neovascularization. These findings suggest that VCAM-1-JunB-IL-8 signaling plays a crucial role in retinal neovascularization, and its antagonism might provide an advanced treatment option for proliferative retinopathies.
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Affiliation(s)
- Geetika Kaur
- Integrative Biosciences Center, Wayne State University, Detroit, MI, 48202, USA
- Department of Ophthalmology, Visual and Anatomical Sciences, School of Medicine, Wayne State University, Detroit, MI, 48202, USA
| | - Deepti Sharma
- Integrative Biosciences Center, Wayne State University, Detroit, MI, 48202, USA
- Department of Ophthalmology, Visual and Anatomical Sciences, School of Medicine, Wayne State University, Detroit, MI, 48202, USA
| | - Shivantika Bisen
- Integrative Biosciences Center, Wayne State University, Detroit, MI, 48202, USA
- Department of Ophthalmology, Visual and Anatomical Sciences, School of Medicine, Wayne State University, Detroit, MI, 48202, USA
| | - Chandra Sekhar Mukhopadhyay
- School of Animal Biotechnology, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, 141004, India
| | - Katherine Gurdziel
- Institute of Environmental Health Sciences and Department of Pharmacology, School of Medicine, Wayne State University, Detroit, MI, 48202, USA
| | - Nikhlesh K Singh
- Integrative Biosciences Center, Wayne State University, Detroit, MI, 48202, USA.
- Department of Ophthalmology, Visual and Anatomical Sciences, School of Medicine, Wayne State University, Detroit, MI, 48202, USA.
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7
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Jayachandra K, Gowda MDM, Rudresha GV, Manjuprasanna VN, Urs AP, Nandana MB, Bharatha M, Jameel NM, Vishwanath BS. Inhibition of sPLA 2 enzyme activity by cell-permeable antioxidant EUK-8 and downregulation of p38, Akt, and p65 signals induced by sPLA 2 in inflammatory mouse paw edema model. J Cell Biochem 2023; 124:294-307. [PMID: 36585945 DOI: 10.1002/jcb.30366] [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: 07/17/2022] [Revised: 11/24/2022] [Accepted: 12/19/2022] [Indexed: 01/01/2023]
Abstract
The arachidonic acid (AA) metabolic pathway, plays a vital role in the production of eicosanoids by the action of pro-inflammatory secretory phospholipase A2 (PLA2 ). Release of eicosanoids is known to be involved in many inflammatory diseases. Identification of the inhibitory molecules of this AA pathway enzyme along with the regulation of intracellular signaling cascades may be a finer choice to develop as a powerful anti-inflammatory drug. In this regard, we have screened few cell-permeable antioxidant molecules Tempo, Mito-TEMPO, N,N'-Bis(salicylideneamino)ethane-manganese(II) (EUK)-134, and EUK-8 against pro-inflammatory sPLA2 s. Among these, we found EUK-8 is a potent inhibitor with its IC50 value ranges 0.7-2.0 µM for sPLA2 s isolated from different sources. Furthermore, docking studies confirm the strong binding of EUK-8 towards sPLA2 . In vivo effect of EUK-8 was studied in HSF-sPLA2 -induced edema in mouse paw model. In addition to neutralizing the edema, EUK-8 significantly reduces the phosphorylation level of inflammatory proteins such as p38 member of MAPK pathway, Akt, and p65 along with the suppression of pro-inflammatory cytokine (interleukin-6) and chemokine (CXCL1) in edematous tissue. This shows that EUK-8 not only inhibits the sPLA2 activity, it also plays an important role in the regulation of sPLA2 -induced cell signaling cascades. Apart from the sPLA2 inhibition, we also examine the regulatory actions of EUK-8 with other downstream enzymes of AA pathway such as 5-LOX assay in human polymorphonuclear leukocytes (PMNs) and COX-2 expression in carrageenan-λ induced paw edema. Here EUK-8 significantly inhibits 5-LOX enzyme activity and downregulates COX-2 expression. These data indicate that EUK-8 found to be a promising multitargeted inhibitory molecule toward inflammatory pathway. In conclusion, mitochondrial targeted antioxidant EUK-8 is not only the powerful antioxidant, also a potent anti-inflammatory molecule and may be a choice of molecule for pharmacological applications.
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Affiliation(s)
- Krishnegowda Jayachandra
- Department of Studies in Biochemistry, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
| | - M D Milan Gowda
- Department of Studies in Biochemistry, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
| | - Gotravalli V Rudresha
- Evolutionary Venomics Lab, Centre for Ecological Sciences, Indian Institute of Science, Bengaluru, Karnataka, India
| | | | - Amog P Urs
- Comprehensive Cancer Centre, The Ohio State University, Columbus, Ohio, USA
| | | | - Madeva Bharatha
- Department of Studies in Biochemistry, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
| | - Noor Mohamed Jameel
- Department of Studies in Biochemistry, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
| | - Bannikuppe S Vishwanath
- Department of Studies in Biochemistry, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
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8
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Mursalin MH, Astley R, Coburn PS, Miller FC, Callegan MC. Roles of CCL2 and CCL3 in intraocular inflammation during Bacillus endophthalmitis. Exp Eye Res 2022; 224:109213. [PMID: 36063964 PMCID: PMC9826602 DOI: 10.1016/j.exer.2022.109213] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/18/2022] [Accepted: 08/04/2022] [Indexed: 01/11/2023]
Abstract
Bacillus cereus (B. cereus) endophthalmitis is a vision-threatening bacterial infection. Uncontrolled inflammatory responses are the hallmark of this disease which cause irreversible damage to the retina. We recently reported C-X-C chemokines as a vital modulators which impacted the pathogenesis of this disease. Here, we investigated the impact of two highly upregulated C-C chemokines, CCL2 and CCL3, on intraocular inflammation this disease. B. cereus was injected into the eyes of C57BL/6J (WT), CCL2-/-, and CCL3-/- mice to induce endophthalmitis. Infected eyes were examined for bacterial growth, retinal function, and inflammation. Bacterial growth in CCL2-/- and CCL3-/- mice were similar, but retained retinal function was greater in CCL2-/- and CCL3-/- eyes compared to that of C57BL/6J eyes. The retinal architecture of infected eyes of CCL2-/- mice were conserved for a longer period of time than in infected CCL3-/- eyes. Infected CCL2-/- and CCL3-/- eyes had less inflammation than did infected C57BL/6J eyes. Based on these results, we assessed the efficacies of intravitreal anti-CCL2 or anti-CCL3 with or without the antibiotic gatifloxacin. Compared to infected untreated eyes, there was significantly less inflammation and greater retention of retinal function in eyes treated with anti-CCL2 or anti-CCL3 with gatifloxacin. This study showed that B. cereus endophthalmitis in CCL2-/- mice had a better clinical outcome than in CCL3-/- mice. Intravitreal administration of anti-CCL2 and anti-CCL3 with gatifloxacin significantly reduced inflammation and provided protection of retinal function. These results suggest that CCL2 and CCL3 are prospective anti-inflammatory targets that should be tested along with other antibiotics for treating Bacillus and perhaps other forms of endophthalmitis.
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Affiliation(s)
- Md Huzzatul Mursalin
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
| | - Roger Astley
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Dean McGee Eye Institute, Oklahoma City, Oklahoma, USA
| | - Phillip S. Coburn
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Dean McGee Eye Institute, Oklahoma City, Oklahoma, USA
| | - Frederick C. Miller
- Department of Cell Biology and Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
| | - Michelle C. Callegan
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Dean McGee Eye Institute, Oklahoma City, Oklahoma, USA
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
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9
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Chun LY, Dahmer DJ, Amin SV, Hariprasad SM, Skondra D. Update on Current Microbiological Techniques for Pathogen Identification in Infectious Endophthalmitis. Int J Mol Sci 2022; 23:11883. [PMID: 36233183 PMCID: PMC9570044 DOI: 10.3390/ijms231911883] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 09/19/2022] [Accepted: 09/26/2022] [Indexed: 11/16/2022] Open
Abstract
Infectious endophthalmitis is a vision-threatening medical emergency that requires prompt clinical diagnosis and the initiation of treatment. However, achieving precision in endophthalmitis management remains challenging. In this review, we provide an updated overview of recent studies that are representative of the current trends in clinical microbiological techniques for infectious endophthalmitis.
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Affiliation(s)
- Lindsay Y. Chun
- Department of Ophthalmology and Visual Science, The University of Chicago Hospitals and Health System, Chicago, IL 60637, USA
| | - Donavon J. Dahmer
- College of Medicine, University of South Alabama, Mobile, AL 36688, USA
| | - Shivam V. Amin
- Department of Ophthalmology and Visual Science, The University of Chicago Hospitals and Health System, Chicago, IL 60637, USA
| | - Seenu M. Hariprasad
- Department of Ophthalmology and Visual Science, The University of Chicago Hospitals and Health System, Chicago, IL 60637, USA
| | - Dimitra Skondra
- Department of Ophthalmology and Visual Science, The University of Chicago Hospitals and Health System, Chicago, IL 60637, USA
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10
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Li T, Wu Y, Cai W, Wang D, Ren C, Shen T, Yu D, Qiang S, Hu C, Zhao Z, Yu J, Peng C, Tang BZ. Vision Defense: Efficient Antibacterial AIEgens Induced Early Immune Response for Bacterial Endophthalmitis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2202485. [PMID: 35794437 PMCID: PMC9443450 DOI: 10.1002/advs.202202485] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 06/04/2022] [Indexed: 05/28/2023]
Abstract
Bacterial endophthalmitis (BE) is an acute eye infection and potentially irreversible blinding ocular disease. The empirical intravitreous injection of antibiotic is the primary treatment once diagnosed as BE. However, the overuse of antibiotic contributes to the drug resistance of pathogens and the retinal toxicity of antibiotic limits its application in clinic. Herein, a cationic aggregation-induced emission luminogens named with triphenylamine thiophen pyridinium (TTPy) is reported for photodynamic treatment of BE. TTPy can selectively discriminate and kill bacteria efficiently over normal ocular cells. More importantly, TTPy shows excellent antibacterial ability in BE rat models infected by Staphylococcus aureus. Meanwhile, the bacterial killing behavior triggered by TTPy induces innate immune response at an early stage of infection, limiting subsequent robust inflammation and protecting retina from bacterial toxins and inflammation-induced bystander damage. In addition, TTPy performs better antibacterial ability than commercially used Rose Bengal, suggesting its excellent capability of vision salvage in acute BE. This study exhibits an efficient photodynamic antibacterial treatment to BE, which induces an early intraocular immune response and saves useful vision, endowing TTPy a promising potential for clinical application of ocular infections.
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Affiliation(s)
- Tingting Li
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Yan Wu
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Wenting Cai
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Dong Wang
- Center for AIE ResearchShenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen518060China
| | - Chengda Ren
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Tianyi Shen
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Donghui Yu
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Sujing Qiang
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Chengyu Hu
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Zheng Zhao
- Shenzhen Institute of Molecular Aggregate Science and EngineeringSchool of Science and EngineeringThe Chinese University of Hong KongShenzhen518172China
| | - Jing Yu
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
| | - Chen Peng
- Department of OphthalmologyShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China
- Department of RadiologyShanghai Public Health Clinical CenterFudan UniversityShanghai201508China
| | - Ben Zhong Tang
- Shenzhen Institute of Molecular Aggregate Science and EngineeringSchool of Science and EngineeringThe Chinese University of Hong KongShenzhen518172China
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11
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Soon MY, Allen PJ, Dawkins RC. Cytokine Expression in Staphylococcal and Streptococcal Endophthalmitis. Biomed Hub 2022; 7:88-98. [PMID: 35950012 PMCID: PMC9294960 DOI: 10.1159/000525330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 04/21/2022] [Indexed: 11/19/2022] Open
Abstract
<b><i>Background:</i></b> Endophthalmitis is an infection of ocular tissues, often with devastating outcomes for vision. Immunomodulation is an emerging avenue for therapeutic intervention in endophthalmitis, with the expression of cytokines central to potential mechanisms. This literature review with a systematic approach characterizes the cytokine expression in both animal and human staphylococcal and streptococcal endophthalmitis. <b><i>Method and Results:</i></b> Four online databases were searched for studies profiling cytokine levels in animal models or human populations with staphylococcal and/or streptococcal endophthalmitis. Of the 1,060 articles identified, 14 studies were included in this review comprising eight animal models and six human populations. Mouse, rat, and rabbit models of <i>Staphylococcus aureus</i>, <i>Staphylococcus epidermidis</i>, and <i>Streptococcus pneumoniae</i> endophthalmitis had elevated levels of IL-1β, IL-6, IFN-γ, TNF-α, and IL-8, with earlier peaks observed in <i>S</i>. <i>epidermidis</i> infection. Human endophthalmitis demonstrated significantly increased mediator levels compared to controls for a range of pro-inflammatory and anti-inflammatory cytokines, chemokines, and growth factors. Several associations were established between cytokine concentrations and both initial visual acuity and visual prognosis, with no consistent correlations across trials. <b><i>Conclusions:</i></b> It may be that virulence factors and the combinations of toll-like receptors activated influence the pathogen-specific visual outcomes observed in endophthalmitis. Furthermore, disease severity and potential therapeutic targets may be dependent on synergistic and compensatory cytokine pathways and the expression of anti-inflammatory mediators. Future research should aim to better characterize the roles of inflammatory mediators and solidify associations between pathogens, inflammation, and endophthalmitis outcomes. This has exciting implications for the prevention and treatment of endophthalmitis in clinical settings.
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Affiliation(s)
- Marcus Y. Soon
- Ophthalmology, Department of Surgery, The University of Melbourne, Melbourne, Victoria, Australia
| | - Penelope J. Allen
- Ophthalmology, Department of Surgery, The University of Melbourne, Melbourne, Victoria, Australia
- Royal Victorian Eye and Ear Hospital, Melbourne, Victoria, Australia
- Centre for Eye Research Australia, Melbourne, Victoria, Australia
| | - Rosie C.H. Dawkins
- Ophthalmology, Department of Surgery, The University of Melbourne, Melbourne, Victoria, Australia
- Royal Victorian Eye and Ear Hospital, Melbourne, Victoria, Australia
- Centre for Eye Research Australia, Melbourne, Victoria, Australia
- *Rosie C.H. Dawkins,
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12
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Lee EJ, Napier RJ, Vance EE, Lashley SJ, Truax AD, Ting JP, Rosenzweig HL. The innate immune receptor Nlrp12 suppresses autoimmunity to the retina. J Neuroinflammation 2022; 19:69. [PMID: 35313917 PMCID: PMC8939070 DOI: 10.1186/s12974-022-02425-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 02/27/2022] [Indexed: 12/23/2022] Open
Abstract
Background Nod-like receptors (NLRs) are critical to innate immune activation and induction of adaptive T cell responses. Yet, their role in autoinflammatory diseases of the central nervous system (CNS) remains incompletely defined. The NLR, Nlrp12, has been reported to both inhibit and promote neuroinflammation in an animal model of multiple sclerosis (experimental autoimmune encephalomyelitis, EAE), where its T cell-specific role has been investigated. Uveitis resulting from autoimmunity of the neuroretina, an extension of the CNS, involves a breach in immune privilege and entry of T cells into the eye. Here, we examined the contribution of Nlrp12 in a T cell-mediated model of uveitis, experimental autoimmune uveitis (EAU). Methods Mice were immunized with interphotoreceptor retinoid-binding protein peptide 1–20 (IRBP1–20) emulsified in Complete Freund’s adjuvant, CFA. Uveitis was evaluated by clinical and histopathological scoring, and comparisons were made in WT vs. Nlrp12−/− mice, lymphopenic Rag1−/− mice reconstituted with WT vs. Nlrp12−/− CD4+ T cells, or among bone marrow (BM) chimeric mice. Antigen-specific Th-effector responses were evaluated by ELISA and intracellular cytokine staining. Cellular composition of uveitic eyes from WT or Nlrp12−/− mice was compared using flow cytometry. Expression of Nlrp12 and of cytokines/chemokines within the neuroretina was evaluated by immunoblotting and quantitative PCR. Results Nlrp12−/− mice developed exacerbated uveitis characterized by extensive vasculitis, chorioretinal infiltrates and photoreceptor damage. Nlrp12 was dispensable for T cell priming and differentiation of peripheral Th1 or Th17 cells, and uveitis in immunodeficient mice reconstituted with either Nlrp12−/− or WT T cells was similar. Collectively, this ruled out T cells as the source of Nlrp12-mediated protection to EAU. Uveitic Nlrp12−/− eyes had more pronounced myeloid cell accumulation than uveitic WT eyes. Transplantation of Nlrp12−/− BM resulted in increased susceptibility to EAU regardless of host genotype, but interestingly, a non-hematopoietic origin for Nlrp12 function was also observed. Indeed, Nlrp12 was found to be constitutively expressed in the neuroretina, where it suppressed chemokine/cytokine induction. Conclusions Our data identify a combinatorial role for Nlrp12 in dampening autoimmunity of the neuroretina. These findings could provide a pathway for development of therapies for uveitis and potentially other autoinflammatory/autoimmune diseases of the CNS. Supplementary Information The online version contains supplementary material available at 10.1186/s12974-022-02425-x.
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Affiliation(s)
- Ellen J Lee
- VA Portland Health Care System, Portland, OR, USA.,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA
| | - Ruth J Napier
- VA Portland Health Care System, Portland, OR, USA.,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA
| | - Emily E Vance
- VA Portland Health Care System, Portland, OR, USA.,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA
| | | | - Agnieszka D Truax
- Lineberger Comprehensive Cancer Center, University North Carolina, Chapel Hill, NC, USA
| | - Jenny P Ting
- Lineberger Comprehensive Cancer Center, Depts. Genetics and Microbiology-Immunology, University of North Carolina, Chapel Hill, NC, USA
| | - Holly L Rosenzweig
- VA Portland Health Care System, Portland, OR, USA. .,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA. .,Oregon Health & Science University, VA Portland Health Care System, 3710 SW US Veterans Hospital Rd., Bldg 103, Room E-222, Mail stop: VA R&D-14, Portland, OR, 97239, USA.
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13
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Zhao H, Clevenger AL, Coburn PS, Callegan MC, Rybenkov V. Condensins are essential for Pseudomonas aeruginosa corneal virulence through their control of lifestyle and virulence programs. Mol Microbiol 2022; 117:937-957. [PMID: 35072315 PMCID: PMC9512581 DOI: 10.1111/mmi.14883] [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: 09/30/2021] [Revised: 01/20/2022] [Accepted: 01/20/2022] [Indexed: 12/01/2022]
Abstract
Pseudomonas aeruginosa is a significant opportunistic pathogen responsible for numerous human infections. Its high pathogenicity resides in a diverse array of virulence factors and an ability to adapt to hostile environments. We report that these factors are tied to the activity of condensins, SMC and MksBEF, which primarily function in structural chromosome maintenance. This study revealed that both proteins are required for P. aeruginosa virulence during corneal infection. The reduction in virulence was traced to broad changes in gene expression. Transcriptional signatures of smc and mksB mutants were largely dissimilar and non-additive, with the double mutant displaying a distinct gene expression profile. Affected regulons included those responsible for lifestyle control, primary metabolism, surface adhesion and biofilm growth, iron and sulfur assimilation, and numerous virulence factors, including type 3 and type 6 secretion systems. The in vitro phenotypes of condensin mutants mirrored their transcriptional profiles and included impaired production and secretion of multiple virulence factors, growth deficiencies under nutrient limiting conditions, and altered c-di-GMP signaling. Notably, c-di-GMP mediated some but not all transcriptional responses of the mutants. Thus, condensins are integrated into the control of multiple genetic programs related to epigenetic and virulent behavior of P. aeruginosa.
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Affiliation(s)
- Hang Zhao
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK, USA
| | - April L Clevenger
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK, USA
| | - Phillip S Coburn
- Department of Ophthalmology, the University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd, Oklahoma City, USA
| | - Michelle C Callegan
- Department of Ophthalmology, the University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd, Oklahoma City, USA
| | - Valentin Rybenkov
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK, USA
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14
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Mursalin MH, Coburn PS, Miller FC, Livingston ET, Astley R, Callegan MC. C-X-C Chemokines Influence Intraocular Inflammation During Bacillus Endophthalmitis. Invest Ophthalmol Vis Sci 2021; 62:14. [PMID: 34784411 PMCID: PMC8606850 DOI: 10.1167/iovs.62.14.14] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Purpose The purpose of this study was to explore the C-X-C chemokines CXCL2 and CXCL10 as potential anti-inflammatory targets for Bacillus endophthalmitis. Methods Bacillus endophthalmitis was induced in C57BL/6J, CXCL2−/−, and CXCL10−/− mice. At specific times postinfection, eyes were analyzed for Bacillus, retinal function, and inflammation. The efficacies of intravitreal anti-CXCL2 and anti-CXCL10 with or without gatifloxacin in B. cereus endophthalmitis were also assessed using the same techniques. Results Despite similar Bacillus growth in eyes of C57BL/6J, CXCL2−/−, and CXCL10−/− mice, retinal function retention was greater in eyes of CXCL2−/− and CXCL10−/− mice compared to that of C57BL/6J mice. Neutrophil migration into eyes of CXCL2−/− and CXCL10−/− mice was reduced to a greater degree compared to that of eyes of C57BL/6J mice. Infected CXCL2−/− and CXCL10−/− mouse eyes had significantly less inflammation compared to that of C57BL/6J eyes. Retinal structures in infected eyes of CXCL2−/− mice were preserved for a longer time than in CXCL10−/− eyes. Compared to untreated eyes, there was less inflammation and significant retention of retinal function in eyes treated with anti-CXCL2 and anti-CXCL10 with or without gatifloxacin. Conclusions For Bacillus endophthalmitis, the absence of CXCL2 or CXCL10 in mice resulted in retained retinal function and less inflammation. The absence of CXCL2 led to a better clinical outcome than the absence of CXCL10. The use of anti-CXCL2 and anti-CXCL10 limited inflammation during B. cereus endophthalmitis. These results highlight the utility of CXCL2 and CXCL10 as potential targets for anti-inflammatory therapy that can be tested in conjunction with antibiotics for improving treating Bacillus endophthalmitis.
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Affiliation(s)
- Md Huzzatul Mursalin
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Phillip S Coburn
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States.,Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Frederick C Miller
- Department of Cell Biology and Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Erin T Livingston
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Roger Astley
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States.,Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Michelle C Callegan
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States.,Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States.,Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
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15
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Immune Inhibitor A Metalloproteases Contribute to Virulence in Bacillus Endophthalmitis. Infect Immun 2021; 89:e0020121. [PMID: 34097460 DOI: 10.1128/iai.00201-21] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Endophthalmitis is a devastating infection that can cause blindness. Over half of Bacillus endophthalmitis cases result in significant loss of useful vision. Bacillus produces many virulence factors that may contribute to retinal damage and robust inflammation. We analyzed Bacillus immune inhibitor A (InhA) metalloproteases in the context of this disease, hypothesizing that InhAs contribute to Bacillus intraocular virulence and inflammation. We analyzed phenotypes and infectivity of wild type (WT), InhA1-deficient (ΔinhA1), InhA2-deficient (ΔinhA2), or InhA1, A2, and A3-deficient (ΔinhA1-3) Bacillus thuringiensis. In vitro analysis of growth, proteolysis, and cytotoxicity were compared. WT and InhA mutants were similarly cytotoxic to retinal cells. Mutants ΔinhA1 and ΔinhA2 entered log phase growth earlier than WT. Proteolysis by the ΔinhA1-3 mutant was decreased, but this strain grew similar to WT in vitro. Experimental endophthalmitis was initiated by intravitreally infecting C57BL/6J mice with 200 CFU of B. thuringiensis WT or InhA mutants. Eyes were analyzed for intraocular Bacillus and myeloperoxidase concentrations, retinal function loss, and gross histological changes. Eyes infected with ΔinhA1 or ΔinhA2 strains contained greater numbers of bacteria than eyes infected with WT throughout the infection course. Eyes infected with single mutants had inflammation and retinal function loss similar to eyes infected with WT strain. Eyes infected with ΔinhA1-3 cleared the infection. RT-PCR results suggested that there may be compensatory expression of the other InhAs in the single InhA mutant. These results indicate that together, the InhA metalloproteases contribute to the severity of infection and inflammation in Bacillus endophthalmitis.
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16
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Mursalin MH, Coburn PS, Miller FC, Livingston ET, Astley R, Callegan MC. Innate Immune Interference Attenuates Inflammation In Bacillus Endophthalmitis. Invest Ophthalmol Vis Sci 2021; 61:17. [PMID: 33180117 PMCID: PMC7671874 DOI: 10.1167/iovs.61.13.17] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Purpose To explore the consequences of innate interference on intraocular inflammatory responses during Bacillus endophthalmitis. Methods Bacillus endophthalmitis was induced in mice. Innate immune pathway activation was interfered by injecting S layer protein-deficient (∆slpA) B. thuringiensis or by treating wild-type (WT)–infected mice with a TLR2/4 inhibitor (WT+OxPAPC). At 10 hours postinfection, eyes were harvested and RNA was purified. A NanoString murine inflammation panel was used to compare gene expression in WT-infected, WT+OxPAPC, ∆slpA-infected, and uninfected eyes. Results In WT-infected eyes, 56% of genes were significantly upregulated compared to uninfected controls. Compared to WT-infected eyes, the expression of 27% and 50% of genes were significantly reduced in WT+OxPAPC and ∆slpA-infected eyes, respectively. Expression of 61 genes that were upregulated in WT-infected eyes was decreased in WT+OxPAPC and ∆slpA-infected eyes. Innate interference resulted in blunted expression of complement factors (C3, Cfb, and C6) and several innate pathway genes (TLRs 2, 4, 6, and 8, MyD88, Nod2, Nlrp3, NF-κB, STAT3, RelA, RelB, and Ptgs2). Innate interference also reduced the expression of several inflammatory cytokines (CSF2, CSF3, IL-6, IL-1β, IL-1α, TNFα, IL-23α, TGFβ1, and IL-12β) and chemokines (CCL2, CCL3, and CXCLs 1, 2, 3, 5, 9, and 10). All of the aforementioned genes were significantly upregulated in WT-infected eyes. Conclusions These results suggest that interfering with innate activation significantly reduced the intraocular inflammatory response in Bacillus endophthalmitis. This positive clinical outcome could be a strategy for anti-inflammatory therapy of an infection typically refractory to corticosteroid treatment.
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Affiliation(s)
- Md Huzzatul Mursalin
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States.,Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Phillip S Coburn
- Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States.,Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Frederick C Miller
- Department of Cell Biology and Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Erin T Livingston
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Roger Astley
- Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States.,Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Michelle C Callegan
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States.,Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States.,Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
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17
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Gandhi J, Joseph J. Differential inflammatory response to Aspergillus flavus and Candida albicans infection in human retinal pigment epithelial cells: Role in treatment of endophthalmitis. J Mycol Med 2021; 31:101136. [PMID: 33873147 DOI: 10.1016/j.mycmed.2021.101136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 03/22/2021] [Accepted: 03/29/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Fungal endophthalmitis is an emerging vision-threatening complication in tropical countries and the Retinal pigment epithelial cells (RPE) are said to play a major role in the retinal pathology. The aim of this study was to compare the immune response of Retinal pigment epithelial cells (RPE) challenged with A. flavus and C. albicans strains, isolated from patients with fungal endophthalmitis. MATERIAL AND METHODS Retinal Pigment epithelial cells (ARPE-19) cells were infected with A. flavus and C. albicans, and gene expression were assessed for TLRs, immune-mediators, and matrix metalloproteinases (MMPs). RESULTS We observed a time-dependent gene expression of TLRs (TLR-2,-7 and -9); IL-8 and TNF-α in RPE cells challenged with A. flavus and C. albicans. Additonally, IL-6 (3.3 fold), IL-10 (15.2 fold), and IL-17 (5.6 fold) were significantly up-regulated only in cells infected with A. flavus. Additionally, MMP-9 gene expression was up-regulated in both A.flavus as well as C.albicans infected cells, while MMP- 2 gene expression was induced only in cells infected with C.albicans. A total of 9 upregulated differential expression of genes (DEGs) in A. flavus infected cells and 7 DEGs in C. albicans infected cells were used to construct Protein-protein interaction (PPI) network. CONCLUSION RPE cells induced a differential innate immune response depending on fungal species involved (A.flavus and C.albicans) and may provide clues for novel treatment targets and better prognosis.
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Affiliation(s)
- Jaishree Gandhi
- Jhaveri Microbiology Centre, Brien Holden Eye Research Centre, L. V. Prasad Eye Institute, Hyderabad, Telangana 500034 , India; Manipal Academy of Higher Education, Karnataka, India
| | - Joveeta Joseph
- Jhaveri Microbiology Centre, Brien Holden Eye Research Centre, L. V. Prasad Eye Institute, Hyderabad, Telangana 500034 , India.
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18
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Ma C, Liu G, Liu W, Xu W, Li H, Piao S, Sui Y, Feng W. CXCL1 stimulates decidual angiogenesis via the VEGF-A pathway during the first trimester of pregnancy. Mol Cell Biochem 2021; 476:2989-2998. [PMID: 33770315 DOI: 10.1007/s11010-021-04137-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 03/13/2021] [Indexed: 12/29/2022]
Abstract
Angiogenesis is critical to establishing a successful pregnancy. The chemokine (C-X-C motif) ligand 1 (CXCL1) is a small cytokine belonging to the CXC chemokine family that is an important chemokine involved in the processes of angiogenesis and arteriogenesis; however, little is known about its role in decidual angiogenesis. Effects of CXCL1 on cell proliferation and migration (propidium iodide staining and wound healing assays) of HUVEC cells were determined. The angiogenesis roles of CXCL1 in HUVEC-HTR8/SVneo co-culture system were detected by the tube formation assay. Signal transduction pathways in HUVEC cells in response to CXCL1 were determined by in-cell western analyses. In vivo, mice were injected with (1) PBS (Group A) or (2) CXCL1-neutralizing antibody (Group B) or (3) CXCL1-neutralizing antibody plus recombinant VEGF-A protein (Group C) from E1 to E5 and sacrificed at E6.5 of pregnancy. The decidual angiogenesis in mice was examined by immunohistochemistry of cluster designation 34 (CD34), and the expression levels of vascular endothelial growth factor-A (VEGF-A) in the decidual cells and vascular endothelial growth factor receptor 2 (VEGFR2) in decidual vascular endothelial cells were also tested. Exogenous recombinant human CXCL1 supported endothelial cell proliferation and migration, and this effect was blocked by CXCL1-neutralizing antibody or CXCR2 inhibitor SB265610. The tube formation of HUVEC-HTR8/SVneo co-culture system was significantly stimulated by CXCL1, but this effect was markedly abrogated once they were pretreated with CXCL1-neutralizing antibody or CXCR2 inhibitor SB265610. In addition, the level of vascular endothelial growth factor A (VEGF-A) expression in HUVEC cells was increased by CXCL1, and this level was suppressed by CXCL1-neutralizing antibody or CXCR2 inhibitor SB265610. In vivo, compared with Group A (n = 3), decidual angiogenesis was significantly reduced in Group B by CD34 immunostaining. But compared with Group B, decidual angiogenesis was significantly increased in Group C. In addition, the expression of VEGF-A and VEGFR2 was significantly increased after neutralizing of CXCL1 in Group B. In conclusions, CXCL1 may play essential roles in decidual angiogenesis during the first trimester, and this function may be mediated in part via altering VEGF-A expression.
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Affiliation(s)
- Chao Ma
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China
| | - Guangxing Liu
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China
| | - Wei Liu
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China
| | - Wei Xu
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China
| | - Hongtu Li
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China
| | - Shuhua Piao
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China
| | - Yang Sui
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China
| | - Wenhua Feng
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, Liaoning Province Research Institute of Family Planning, China Medical University, 10 PuHe Street, Huanggu District, Shenyang, 110031, China.
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19
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Mursalin MH, Livingston E, Coburn PS, Miller FC, Astley R, Callegan MC. Intravitreal Injection and Quantitation of Infection Parameters in a Mouse Model of Bacterial Endophthalmitis. J Vis Exp 2021:10.3791/61749. [PMID: 33616100 PMCID: PMC8107885 DOI: 10.3791/61749] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Intraocular bacterial infections are a danger to the vision. Researchers use animal models to investigate the host and bacterial factors and immune response pathways associated with infection to identify viable therapeutic targets and to test drugs to prevent blindness. The intravitreal injection technique is used to inject organisms, drugs, or other substances directly into the vitreous cavity in the posterior segment of the eye. Here, we demonstrated this injection technique to initiate infection in the mouse eye and the technique of quantifying intraocular bacteria. Bacillus cereus was grown in brain heart infusion liquid media for 18 hours and resuspended to a concentration 100 colony forming units (CFU)/0.5 µL. A C57BL/6J mouse was anesthetized using a combination of ketamine and xylazine. Using a picoliter microinjector and glass capillary needles, 0.5 µL of the Bacillus suspension was injected into the mid vitreous of the mouse eye. The contralateral control eye was either injected with sterile media (surgical control) or was not injected (absolute control). At 10 hours post infection, mice were euthanized, and eyes were harvested using sterile surgical tweezers and placed into a tube containing 400 µL sterile PBS and 1 mm sterile glass beads. For ELISAs or myeloperoxidase assays, proteinase inhibitor was added to the tubes. For RNA extraction, the appropriate lysis buffer was added. Eyes were homogenized in a tissue homogenizer for 1-2 minutes. Homogenates were serially diluted 10-fold in PBS and track diluted onto agar plates. The remainder of the homogenates were stored at -80 °C for additional assays. Plates were incubated for 24 hours and CFU per eye was quantified. These techniques result in reproducible infections in mouse eyes and facilitate quantitation of viable bacteria, the host immune response, and omics of host and bacterial gene expression.
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Affiliation(s)
- Md Huzzatul Mursalin
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center; Department of Ophthalmology, Dean McGee Eye Institute
| | - Erin Livingston
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center
| | - Phillip S Coburn
- Department of Ophthalmology, Dean McGee Eye Institute; Dean McGee Eye Institute
| | - Frederick C Miller
- Department of Cell Biology and Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center
| | - Roger Astley
- Department of Ophthalmology, Dean McGee Eye Institute; Dean McGee Eye Institute
| | - Michelle C Callegan
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center; Department of Ophthalmology, Dean McGee Eye Institute; Dean McGee Eye Institute;
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20
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Li JJ, Yi S, Wei L. Ocular Microbiota and Intraocular Inflammation. Front Immunol 2020; 11:609765. [PMID: 33424865 PMCID: PMC7786018 DOI: 10.3389/fimmu.2020.609765] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 11/23/2020] [Indexed: 12/20/2022] Open
Abstract
The term ocular microbiota refers to all types of commensal and pathogenic microorganisms present on or in the eye. The ocular surface is continuously exposed to the environment and harbors various commensals. Commensal microbes have been demonstrated to regulate host metabolism, development of immune system, and host defense against pathogen invasion. An unbalanced microbiota could lead to pathogenic microbial overgrowth and cause local or systemic inflammation. The specific antigens that irritate the deleterious immune responses in various inflammatory eye diseases remain obscure, while recent evidence implies a microbial etiology of these illnesses. The purpose of this review is to provide an overview of the literature on ocular microbiota and the role of commensal microbes in several eye diseases. In addition, this review will also discuss the interaction between microbial pathogens and host factors involved in intraocular inflammation, and evaluate therapeutic potential of targeting ocular microbiota to treat intraocular inflammation.
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Affiliation(s)
- Jing Jing Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Sanjun Yi
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Lai Wei
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
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21
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Napier RJ, Lee EJ, Davey MP, Vance EE, Furtado JM, Snow PE, Samson KA, Lashley SJ, Brown BR, Horai R, Mattapallil MJ, Xu B, Callegan MC, Uebelhoer LS, Lancioni CL, Vehe RK, Binstadt BA, Smith JR, Caspi RR, Rosenzweig HL. T cell-intrinsic role for Nod2 in protection against Th17-mediated uveitis. Nat Commun 2020; 11:5406. [PMID: 33106495 PMCID: PMC7589501 DOI: 10.1038/s41467-020-18961-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 09/20/2020] [Indexed: 12/21/2022] Open
Abstract
Mutations in nucleotide-binding oligomerization domain-containing protein 2 (NOD2) cause Blau syndrome, an inflammatory disorder characterized by uveitis. The antimicrobial functions of Nod2 are well-established, yet the cellular mechanisms by which dysregulated Nod2 causes uveitis remain unknown. Here, we report a non-conventional, T cell-intrinsic function for Nod2 in suppression of Th17 immunity and experimental uveitis. Reconstitution of lymphopenic hosts with Nod2-/- CD4+ T cells or retina-specific autoreactive CD4+ T cells lacking Nod2 reveals a T cell-autonomous, Rip2-independent mechanism for Nod2 in uveitis. In naive animals, Nod2 operates downstream of TCR ligation to suppress activation of memory CD4+ T cells that associate with an autoreactive-like profile involving IL-17 and Ccr7. Interestingly, CD4+ T cells from two Blau syndrome patients show elevated IL-17 and increased CCR7. Our data define Nod2 as a T cell-intrinsic rheostat of Th17 immunity, and open new avenues for T cell-based therapies for Nod2-associated disorders such as Blau syndrome.
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Affiliation(s)
- Ruth J Napier
- VA Portland Health Care System, Portland, OR, 97239, USA.,Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Ellen J Lee
- VA Portland Health Care System, Portland, OR, 97239, USA.,Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Michael P Davey
- VA Portland Health Care System, Portland, OR, 97239, USA.,Department of Medicine, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Emily E Vance
- VA Portland Health Care System, Portland, OR, 97239, USA.,Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, 97239, USA
| | - João M Furtado
- Division of Ophthalmology, Ribeirão Preto Medical School, University of São Paulo, Butanta, Ribeirão Preto, Brazil
| | - Paige E Snow
- Department of Public Health, Oregon Health and Science University, Portland, OR, 97239, USA
| | | | - Sydney J Lashley
- VA Portland Health Care System, Portland, OR, 97239, USA.,Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, 97239, USA
| | | | - Reiko Horai
- Laboratory of Immunology, NEI, NIH, Bethesda, MD, 20814, USA
| | | | - Biying Xu
- Laboratory of Immunology, NEI, NIH, Bethesda, MD, 20814, USA
| | - Michelle C Callegan
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma, OK, 73104, USA.,Dean A. McGee Institute, Oklahoma City, OK, 73104, USA
| | - Luke S Uebelhoer
- Department of Pediatrics, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Christina L Lancioni
- Department of Pediatrics, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Richard K Vehe
- Department of Pediatrics, University of Minnesota and the University of Minnesota Masonic Children's Hospital, Minneapolis, MN, 55455, USA
| | - Bryce A Binstadt
- Department of Pediatrics, University of Minnesota and the University of Minnesota Masonic Children's Hospital, Minneapolis, MN, 55455, USA.,Center for Immunology and Department of Pediatrics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Justine R Smith
- College of Medicine and Public Health, Flinders University, Adelaide, SA, 5042, Australia
| | - Rachel R Caspi
- Laboratory of Immunology, NEI, NIH, Bethesda, MD, 20814, USA
| | - Holly L Rosenzweig
- VA Portland Health Care System, Portland, OR, 97239, USA. .,Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, 97239, USA.
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22
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Glycolytic inhibitor 2-deoxyglucose suppresses inflammatory response in innate immune cells and experimental staphylococcal endophthalmitis. Exp Eye Res 2020; 197:108079. [PMID: 32454039 DOI: 10.1016/j.exer.2020.108079] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 04/04/2020] [Accepted: 05/20/2020] [Indexed: 02/08/2023]
Abstract
Previously, we have shown that Staphylococcus (S) aureus induces a glycolytic response in retinal residential (microglia) and infiltrated cells (neutrophils and macrophages) during endophthalmitis. In this study, we sought to investigate the physiological role of glycolysis in bacterial endophthalmitis using a glycolytic inhibitor, 2-deoxyglucose (2DG). Our data showed that 2DG treatment attenuated the inflammatory responses of mouse bone marrow-derived macrophages (BMDM) and neutrophils (BMDN) when challenged with either live or heat-killed S. aureus (HKSA). Among the inflammatory mediators, 2DG caused a significant reduction in levels of cytokines (TNF-α, IL-1β, IL-6) and chemokines (CXCL1 and CXCL2). Western blot analysis of 2DG treated cells showed downregulation of bacterial-induced MEK/ERK pathways. In vivo, intravitreal administration of 2DG both pre- and post-bacterial infection resulted in a significant reduction in intraocular inflammation in C57BL/6 mouse eyes and downregulation of ERK phosphorylation in retinal tissue. Collectively, our study demonstrates that 2DG attenuates inflammatory response in bacterial endophthalmitis and cultured innate immune cells via inhibition of ERK signaling. Thus glycolytic inhibitors in combination with antibiotics could mitigate inflammation-mediated tissue damage in ocular infections.
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23
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Mursalin MH, Livingston ET, Callegan MC. The cereus matter of Bacillus endophthalmitis. Exp Eye Res 2020; 193:107959. [PMID: 32032628 PMCID: PMC7113113 DOI: 10.1016/j.exer.2020.107959] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/06/2020] [Accepted: 02/03/2020] [Indexed: 02/06/2023]
Abstract
Bacillus cereus (B. cereus) endophthalmitis is a devastating intraocular infection primarily associated with post-traumatic injuries. The majority of these infections result in substantial vision loss, if not loss of the eye itself, within 12-48 h. Multifactorial mechanisms that lead to the innate intraocular inflammatory response during this disease include the combination of robust bacterial replication, migration of the organism throughout the eye, and toxin production by the organism. Therefore, the window of therapeutic intervention in B. cereus endophthalmitis is quite narrow compared to that of other pathogens which cause this disease. Understanding the interaction of bacterial and host factors is critical in understanding the disease and formulating more rational therapeutics for salvaging vision. In this review, we will discuss clinical and research findings related to B. cereus endophthalmitis in terms of the organism's virulence and inflammogenic potential, and strategies for improving of current therapeutic regimens for this blinding disease.
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Affiliation(s)
- Md Huzzatul Mursalin
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Erin T Livingston
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Michelle C Callegan
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, OK, USA; Oklahoma Center for Neuroscience, Oklahoma City, OK, USA; Dean A. McGee Eye Institute, Oklahoma City, OK, USA.
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24
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Mursalin MH, Coburn PS, Livingston E, Miller FC, Astley R, Flores-Mireles AL, Callegan MC. Bacillus S-Layer-Mediated Innate Interactions During Endophthalmitis. Front Immunol 2020; 11:215. [PMID: 32117322 PMCID: PMC7028758 DOI: 10.3389/fimmu.2020.00215] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 01/27/2020] [Indexed: 12/14/2022] Open
Abstract
Bacillus endophthalmitis is a severe intraocular infection. Hallmarks of Bacillus endophthalmitis include robust inflammation and rapid loss of vision. We reported that the absence of Bacillus surface layer protein (SLP) significantly blunted endophthalmitis severity. Here, we further investigated SLP in the context of Bacillus-retinal cell interactions and innate immune pathways to explore the mechanisms by which SLP contributes to intraocular inflammation. We compared phenotypes of Wild-type (WT) and SLP deficient (ΔslpA) Bacillus thuringiensis by analyzing bacterial adherence to and phagocytosis by human retinal Muller cells and phagocytosis by mouse neutrophils. Innate immune receptor activation by the Bacillus envelope and purified SLP was analyzed using TLR2/4 reporter cell lines. A synthetic TLR2/4 inhibitor was used as a control for this receptor activation. To induce endophthalmitis, mouse eyes were injected intravitreally with 100 CFU WT or ΔslpA B. thuringiensis. A group of WT infected mice was treated intravitreally with a TLR2/4 inhibitor at 4 h postinfection. At 10 h postinfection, infected eyes were analyzed for viable bacteria, inflammation, and retinal function. We observed that B. thuringiensis SLPs contributed to retinal Muller cell adherence, and protected this pathogen from Muller cell- and neutrophil-mediated phagocytosis. We found that B. thuringiensis envelope activated TLR2 and, surprisingly, TLR4, suggesting the presence of a surface-associated TLR4 agonist in Bacillus. Further investigation showed that purified SLP from B. thuringiensis activated TLR4, as well as TLR2 in vitro. Growth of WT B. thuringiensis was significantly higher and caused greater inflammation in untreated eyes than in eyes treated with the TLR2/4 inhibitor. Retinal function analysis also showed greater retention of A-wave and B-wave function in infected eyes treated with the TLR2/4 inhibitor. The TLR2/4 inhibitor was not antibacterial in vitro, and did not cause inflammation when injected into uninfected eyes. Taken together, these results suggest a potential role for Bacillus SLP in host-bacterial interactions, as well as in endophthalmitis pathogenesis via TLR2- and TLR4-mediated pathways.
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Affiliation(s)
- Md Huzzatul Mursalin
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Phillip S. Coburn
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Dean McGee Eye Institute, Oklahoma City, OK, United States
| | - Erin Livingston
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Frederick C. Miller
- Department of Cell Biology and Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Roger Astley
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Dean McGee Eye Institute, Oklahoma City, OK, United States
| | - Ana L. Flores-Mireles
- Department of Biological Sciences, University of Notre Dame, South Bend, IN, United States
| | - Michelle C. Callegan
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Dean McGee Eye Institute, Oklahoma City, OK, United States
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25
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Molecular Signatures Related to the Virulence of Bacillus cereus Sensu Lato, a Leading Cause of Devastating Endophthalmitis. mSystems 2019; 4:4/6/e00745-19. [PMID: 31796569 PMCID: PMC6890933 DOI: 10.1128/msystems.00745-19] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacillus endophthalmitis is a devastating eye infection that causes rapid blindness through extracellular tissue-destructive exotoxins. Despite its importance, knowledge of the phylogenetic relationships and population structure of intraocular Bacillus spp. is lacking. In this study, we sequenced the whole genomes of eight Bacillus intraocular pathogens independently isolated from 8/52 patients with posttraumatic Bacillus endophthalmitis infections in the Eye Hospital of Wenzhou Medical University between January 2010 and December 2018. Phylogenetic analysis revealed that the pathogenic intraocular isolates belonged to Bacillus cereus, Bacillus thuringiensis and Bacillus toyonensis To determine the virulence of the ocular isolates, three representative strains were injected into mouse models, and severe endophthalmitis leading to blindness was observed. Through incorporating publicly available genomes for Bacillus spp., we found that the intraocular pathogens could be isolated independently but displayed a similar genetic context. In addition, our data provide genome-wide support for intraocular and gastrointestinal sources of Bacillus spp. belonging to different lineages. Importantly, we identified five molecular signatures of virulence and motility genes associated with intraocular infection, namely, plcA-2, InhA-3, InhA-4, hblA-5, and fliD using pangenome-wide association studies. The characterization of overrepresented genes in the intraocular isolates holds value to predict bacterial evolution and for the design of future intervention strategies in patients with endophthalmitis.IMPORTANCE In this study, we provided a detailed and comprehensive clinicopathological and pathogenic report of Bacillus endophthalmitis over the 8 years of the study period. We first reported the whole-genome sequence of Bacillus spp. causing devastating endophthalmitis and found that Bacillus toyonensis is able to cause endophthalmitis. Finally, we revealed significant endophthalmitis-associated virulence genes involved in hemolysis, immunity inhibition, and pathogenesis. Overall, as more sequencing data sets become available, these data will facilitate comparative research and will reveal the emergence of pathogenic "ocular bacteria."
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26
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Livingston ET, Mursalin MH, Callegan MC. A Pyrrhic Victory: The PMN Response to Ocular Bacterial Infections. Microorganisms 2019; 7:E537. [PMID: 31703354 PMCID: PMC6920826 DOI: 10.3390/microorganisms7110537] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/03/2019] [Accepted: 11/05/2019] [Indexed: 12/21/2022] Open
Abstract
Some tissues of the eye are susceptible to damage due to their exposure to the outside environment and inability to regenerate. Immune privilege, although beneficial to the eye in terms of homeostasis and protection, can be harmful when breached or when an aberrant response occurs in the face of challenge. In this review, we highlight the role of the PMN (polymorphonuclear leukocyte) in different bacterial ocular infections that invade the immune privileged eye at the anterior and posterior segments: keratitis, conjunctivitis, uveitis, and endophthalmitis. Interestingly, the PMN response from the host seems to be necessary for pathogen clearance in ocular disease, but the inflammatory response can also be detrimental to vision retention. This "Pyrrhic Victory" scenario is explored in each type of ocular infection, with details on PMN recruitment and response at the site of ocular infection. In addition, we emphasize the differences in PMN responses between each ocular disease and its most common corresponding bacterial pathogen. The in vitro and animal models used to identify PMN responses, such as recruitment, phagocytosis, degranulation, and NETosis, are also outlined in each ocular infection. This detailed study of the ocular acute immune response to infection could provide novel therapeutic strategies for blinding diseases, provide more general information on ocular PMN responses, and reveal areas of bacterial ocular infection research that lack PMN response studies.
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Affiliation(s)
- Erin T. Livingston
- Department of Microbiology and Immunology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (E.T.L.); (M.H.M.)
| | - Md Huzzatul Mursalin
- Department of Microbiology and Immunology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (E.T.L.); (M.H.M.)
| | - Michelle C. Callegan
- Department of Microbiology and Immunology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (E.T.L.); (M.H.M.)
- Department of Ophthalmology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
- Oklahoma Center for Neuroscience, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
- Dean McGee Eye Institute, Oklahoma City, OK 73104, USA
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27
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Mursalin MH, Coburn PS, Livingston E, Miller FC, Astley R, Fouet A, Callegan MC. S-layer Impacts the Virulence of Bacillus in Endophthalmitis. Invest Ophthalmol Vis Sci 2019; 60:3727-3739. [PMID: 31479113 PMCID: PMC6719748 DOI: 10.1167/iovs.19-27453] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Accepted: 07/19/2019] [Indexed: 02/07/2023] Open
Abstract
Purpose Bacillus causes a sight-threating infection of the posterior segment of the eye. The robust intraocular inflammatory response in this disease is likely activated via host innate receptor interactions with components of the Bacillus cell envelope. S-layer proteins (SLPs) of some Gram-positive pathogens contribute to the pathogenesis of certain infections. The potential contributions of SLPs in eye infection pathogenesis have not been considered. Here, we explored the role of a Bacillus SLP (SlpA) in endophthalmitis pathogenesis. Methods The phenotypes and infectivity of wild-type (WT) and S-layer deficient (ΔslpA) Bacillus thuringiensis were compared. Experimental endophthalmitis was induced in C57BL/6J mice by intravitreally injecting 100-CFU WT or ΔslpA B. thuringiensis. Infected eyes were analyzed by bacterial counts, retinal function analysis, histology, and inflammatory cell influx. SLP-induced inflammation was also analyzed in vitro. Muller cells (MIO-M1) were treated with purified SLP. Nuclear factor-κB (NF-κB) DNA binding was measured by ELISA and expression of proinflammatory mediators from Muller cells was measured by RT-qPCR. Results Tested phenotypes of WT and ΔslpA B. thuringiensis were similar, with the exception of absence of the S-layer in the ΔslpA mutant. Intraocular growth of WT and ΔslpA B. thuringiensis was also similar. However, eyes infected with the ΔslpA mutant had significantly reduced inflammatory cell influx, less inflammatory damage to the eyes, and significant retention of retinal function compared with WT-infected eyes. SLP was also a potent stimulator of the NF-κB pathway and induced the expression of proinflammatory mediators (IL6, TNFα, CCL2, and CXCL-1) in human retinal Muller cells. Conclusions Taken together, our results suggest that SlpA contributes to the pathogenesis of Bacillus endophthalmitis, potentially by triggering innate inflammatory pathways in the retina.
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Affiliation(s)
- Md Huzzatul Mursalin
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Phillip S. Coburn
- Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
- Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Erin Livingston
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Frederick C. Miller
- Department of Cell Biology and Department of Family and Preventive Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Roger Astley
- Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
- Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Agnès Fouet
- Institut Cochin INSERM U1016, Paris, France
- CNRS 8104, Paris, France
- University Paris Descartes, Paris, France
| | - Michelle C. Callegan
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
- Department of Ophthalmology, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
- Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
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28
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Miller FC, Coburn PS, Huzzatul MM, LaGrow AL, Livingston E, Callegan MC. Targets of immunomodulation in bacterial endophthalmitis. Prog Retin Eye Res 2019; 73:100763. [PMID: 31150824 DOI: 10.1016/j.preteyeres.2019.05.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/20/2019] [Accepted: 05/23/2019] [Indexed: 12/11/2022]
Abstract
Bacterial infection of the posterior segment of the eye (endophthalmitis) leads to a robust host response that often results in irreversible damage to the layers of the retina, significant vision loss, and in some patients, enucleation of the globe. While a great deal of effort has gone into understanding the role of bacterial virulence factors in disease initiation and propagation, it is becoming increasingly clear that the host response to infection plays a major role in causing the damage associated with endophthalmitis. Researchers have identified the host receptors which detect infecting organisms and initiate the cascade of events that result in inflammation. This inflammation may damage nonregenerative tissues of the eye while attempting to clear the infection. Both Gram-positive and Gram-negative bacteria can cause endophthalmitis. These organisms initiate an immune response by activating toll-like receptor (TLR) pathways. Once an inflammatory response is initiated, the expression of immunomodulators, such as proinflammatory chemokines and cytokines, affect the recruitment of PMNs and other inflammatory cells into the eye. We and others have reported that knockout mice that do not express specific inflammatory pathways and molecules have an attenuated response to infection and retain significant retinal function. These findings suggest that host immune mediators are important components of the response to infections in the posterior segment of the eye, and the timing and level of their production may be related to the severity of the damage and the ultimate visual outcome. If that is the case, a better understanding of the complex and often redundant role of these pathways and inflammatory mediators may identify host molecules as potential anti-inflammatory therapeutic targets. This review highlights potential anti-inflammatory targets during acute inflammation in endophthalmitis, compares and contrasts those with findings in other models of ocular inflammation, and translates current immunomodulatory strategies for other types of infection and inflammation to this blinding disease. Given the poor visual outcomes seen in patients treated with antibiotics alone or in combination with corticosteroids, immunomodulation in addition to antibiotic therapy might be more effective in preserving vision than current regimens.
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Affiliation(s)
- Frederick C Miller
- Department of Family and Preventive Medicine, USA; Department of Cell Biology, USA
| | | | | | | | | | - Michelle C Callegan
- Department of Ophthalmology, USA; Department of Microbiology and Immunology, USA; Oklahoma Center for Neuroscience, USA; University of Oklahoma Health Sciences Center, Dean McGee Eye Institute, Oklahoma City, OK, USA.
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29
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Zhang M, Zhang M, Wang J, Cai Q, Zhao R, Yu Y, Tai H, Zhang X, Xu C. Retro-inverso follicle-stimulating hormone peptide-mediated polyethylenimine complexes for targeted ovarian cancer gene therapy. Drug Deliv 2018; 25:995-1003. [PMID: 29667478 PMCID: PMC6058519 DOI: 10.1080/10717544.2018.1461956] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 04/03/2018] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND The development of nanoparticle drug delivery systems with targeted ligands has the potential to increase treatment efficiency in ovarian cancer. METHODS We developed a 21-amino acid peptide, YTRDLVYGDPARPGIQGTGTF (L-FP21) conjugated to polyethylenimine (PEI) and methoxy polyethylene glycol (mPEG) to prepare a nanoparticle drug vehicle to target follicle-stimulating hormone receptor (FSHR) in ovarian cancer. At the same time, we optimized the ligand of the nanoparticle vehicle using D-peptides, which consist of D-amino acids (D-FP21). Nanoparticle vehicles carrying the therapeutic gene plasmid growth-regulated oncogene alpha (pGRO-α) short hairpin RNA (shRNA) (FP21-PEG-PEI/pGRO-α) were prepared for further investigation. RESULTS Compared with L-FP21, D-FP21 exhibited improved biological stability and higher uptake rate for FSHR-expressing ovarian cancer cells. The cytotoxicity of the L, D-FP21-PEG-PEI/pGRO-α complexes were significantly lower than that of the PEI/pGRO-α complex. The nanoparticle drug with the targeted ligand showed higher transfection efficiencies and improved anti-proliferation effects for ovarian cancer cells than that without the targeted ligand (mPEG-PEI/pGRO-α). Furthermore, an in vivo evaluation of an antitumor assay indicated that D-FP21-PEG-PEI/pGRO-α inhibited the growth of tumor spheroids considerably more than L-FP21-PEG-PEI/pGRO-α; their tumor inhibition rates were 58.5% and 33.3%, respectively. CONCLUSIONS D-FP21-PEG-PEI/plasmid DNA is a safe and efficient gene delivery vehicle for ovarian cancer targeted therapy.
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Affiliation(s)
- Mengyu Zhang
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
- Department of Gynecology, 411 Military Hospital Affiliated to Changhai Hospital of Shanghai, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, China
| | - Mingxing Zhang
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, China
| | - Jing Wang
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
| | - Qingqing Cai
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, China
| | - Ran Zhao
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
| | - Yi Yu
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
| | - Haiyan Tai
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
| | - Xiaoyan Zhang
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, China
| | - Congjian Xu
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, China
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30
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Pei M, Liu X, Zhao C, Gao F, Tao Y, Zhang M. Chemokine and Adhesion Molecule Profiles in Aqueous Humor of Clinically Quiescent Uveitic Cataracts. Curr Eye Res 2018; 44:194-199. [PMID: 30288998 DOI: 10.1080/02713683.2018.1532012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
PURPOSE To investigate the chemokine and adhesion molecule profiles in aqueous humor (AH) of eyes with inactive uveitis and their correlations with inflammation relapse after cataract surgery. METHODS Patients with inactive uveitis who underwent cataract surgery between July 2014 and January 2016 at our center were included. Undiluted AH samples (100-120 µl) were obtained through lateral corneal incisions during surgery, and concentrations of monocyte chemoattractant protein 1 (MCP-1/CCL2), macrophage inflammatory protein 1 (MIP-1), interleukin 8 (IL-8), regulated on activation, normal T cell expressed and secreted (RANTES/CCL5), soluble vascular cell adhesion molecule (sVCAM) and soluble intercellular adhesion molecule (sICAM) were measured by cytometric bead array (BD Bioscience, San Jose, CA). AH levels of these inflammatory factors were compared between different uveitis entities and non-inflammatory control. Risk factors for postoperative inflammation relapse were also analysed in uveitic eyes. RESULTS As compared with the control group, the panuveitis group had significantly higher aqueous concentrations of MCP-1, IL-8, sVCAM, sICAM; the anterior uveitis group had significantly higher concentrations of MCP-1, MIP-1, sVCAM. Uveitic cataracts with postoperative inflammation relapse had significantly higher levels of MCP-1 and IL-8 in AH than those without. And multivariate cox regression analysis revealed that high AH levels of MCP-1 was an independent predictor for postoperative inflammation relapse. CONCLUSIONS Clinically quiescent uveitic eyes have elevated levels of chemokines and soluble adhesion molecules in AH, of which MCP-1 is associate with inflammation relapses after cataract surgery.
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Affiliation(s)
- Minghang Pei
- a Department of Ophthalmology, Peking Union Medical College Hospital , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing , China
| | - Xinshu Liu
- b Department of Ophthalmology , The Fourth People's Hospital of Shenyang , Shenyang , Liaoning , China
| | - Chan Zhao
- a Department of Ophthalmology, Peking Union Medical College Hospital , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing , China
| | - Fei Gao
- a Department of Ophthalmology, Peking Union Medical College Hospital , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing , China
| | - Yong Tao
- c Department of Ophthalmology, Beijing Chao-Yang Hospital , Capital Medical University , Beijing , China
| | - Meifen Zhang
- a Department of Ophthalmology, Peking Union Medical College Hospital , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing , China
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Abe M, Kinjo Y, Ueno K, Takatsuka S, Nakamura S, Ogura S, Kimura M, Araoka H, Sadamoto S, Shinozaki M, Shibuya K, Yoneyama A, Kaku M, Miyazaki Y. Differences in Ocular Complications Between Candida albicans and Non-albicans Candida Infection Analyzed by Epidemiology and a Mouse Ocular Candidiasis Model. Front Microbiol 2018; 9:2477. [PMID: 30386320 PMCID: PMC6199462 DOI: 10.3389/fmicb.2018.02477] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 09/28/2018] [Indexed: 11/13/2022] Open
Abstract
Objectives:Candida species are a major cause of hospital infections, including ocular candidiasis, but few studies have examined the propensities of specific species to invade the eye or the unique immunological responses induced. This study examined the frequency and characteristics of species-specific Candida eye infections by epidemiology and experiments using a mouse ocular candidiasis model. Methods: We reviewed medical records of candidemia patients from January 2012 to March 2017. We also evaluated ocular fungal burden, inflammatory cytokine and chemokine profiles, and inflammatory cell profiles in mice infected with Candida albicans, Candida glabrata, or Candida parapsilosis. Results: During the study period, 20 ocular candidiasis cases were diagnosed among 99 candidemia patients examined by ophthalmologists. Although C. parapsilosis was the most frequent candidemia pathogen, only C. albicans infection was significantly associated with ocular candidiasis by multivariate analysis. In mice, ocular fungal burden and inflammatory mediators were significantly higher during C. albicans infection, and histopathological analysis revealed invading C. albicans surrounded by inflammatory cells. Ocular neutrophil and inflammatory monocyte numbers were significantly greater during C. albicans infection. Conclusion:Candida albicans is strongly associated with ocular candidiasis due to greater capacity for invasion, induction of inflammatory mediators, and recruitment of neutrophils and inflammatory monocytes.
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Affiliation(s)
- Masahiro Abe
- Department of Chemotherapy and Mycoses, National Institute of Infectious Diseases, Tokyo, Japan.,Department of Infection Control and Laboratory Diagnostics, Tohoku University School of Medicine, Miyagi, Japan.,Department of Infectious Diseases, Toranomon Hospital, Tokyo, Japan
| | - Yuki Kinjo
- Department of Chemotherapy and Mycoses, National Institute of Infectious Diseases, Tokyo, Japan.,Department of Bacteriology, The Jikei University School of Medicine, Tokyo, Japan.,Jikei Center for Biofilm Science and Technology, The Jikei University School of Medicine, Tokyo, Japan
| | - Keigo Ueno
- Department of Chemotherapy and Mycoses, National Institute of Infectious Diseases, Tokyo, Japan
| | - Shogo Takatsuka
- Department of Chemotherapy and Mycoses, National Institute of Infectious Diseases, Tokyo, Japan
| | - Shigeki Nakamura
- Department of Chemotherapy and Mycoses, National Institute of Infectious Diseases, Tokyo, Japan
| | - Sho Ogura
- Department of Infectious Diseases, Toranomon Hospital, Tokyo, Japan
| | - Muneyoshi Kimura
- Department of Infectious Diseases, Toranomon Hospital, Tokyo, Japan
| | - Hideki Araoka
- Department of Infectious Diseases, Toranomon Hospital, Tokyo, Japan.,Okinaka Memorial Institute for Medical Research, Tokyo, Japan
| | - Sota Sadamoto
- Department of Surgical Pathology, Toho University School of Medicine, Tokyo, Japan
| | - Minoru Shinozaki
- Department of Surgical Pathology, Toho University School of Medicine, Tokyo, Japan
| | - Kazutoshi Shibuya
- Department of Surgical Pathology, Toho University School of Medicine, Tokyo, Japan
| | - Akiko Yoneyama
- Department of Infectious Diseases, Toranomon Hospital, Tokyo, Japan.,Okinaka Memorial Institute for Medical Research, Tokyo, Japan
| | - Mitsuo Kaku
- Department of Infection Control and Laboratory Diagnostics, Tohoku University School of Medicine, Miyagi, Japan
| | - Yoshitsugu Miyazaki
- Department of Chemotherapy and Mycoses, National Institute of Infectious Diseases, Tokyo, Japan
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Natanov R, Gueler F, Falk CS, Kühn C, Maus U, Boyle EC, Siemeni T, Knoefel AK, Cebotari S, Haverich A, Madrahimov N. Blood cytokine expression correlates with early multi-organ damage in a mouse model of moderate hypothermia with circulatory arrest using cardiopulmonary bypass. PLoS One 2018; 13:e0205437. [PMID: 30308065 PMCID: PMC6181365 DOI: 10.1371/journal.pone.0205437] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 09/25/2018] [Indexed: 12/12/2022] Open
Abstract
Cardiopulmonary bypass (CPB) with moderate hypothermic cardiac arrest (MHCA) is essential for prolonged complex procedures in cardiac surgery and is associated with postoperative complications. Although cytokine release provoked through MHCA under CPB plays a pivotal role in postoperative organ damage, the pathomechanisms are unclear. Here, we investigated the cytokine release pattern and histological organ damage after MHCA using a recently described mouse CPB model. Eight BALB/c mice underwent 60 minutes of circulatory arrest under CPB, were successively rewarmed and reperfused. Blood cytokine concentrations and liver and kidney function parameters were measured and histological changes to these organs were compared to control animals. Our results showed a marked increase in proinflammatory cytokines and histological changes in the kidney, lung, and liver after CPB. Furthermore, clinical chemistry showed signs of hemolysis and acute kidney injury. These results suggest early onset of solid organ injury which correlates with increased leukocyte infiltration. A better understanding of the interplay between pro-inflammatory cytokine activation and solid organ injury in this model of CBP with MHCA will inform strategies to reduce organ damage during cardiac surgeries in the clinic.
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Affiliation(s)
- Ruslan Natanov
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Faikah Gueler
- Department of Nephrology, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Christine S. Falk
- Institute of Transplant Immunology, Integrated Research and Treatment Center Transplantation (IFB-Tx), Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Christian Kühn
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Ulrich Maus
- Department of Pneumology, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Erin C. Boyle
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Thierry Siemeni
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Ann-Katrin Knoefel
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Serghei Cebotari
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Axel Haverich
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
| | - Nodir Madrahimov
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Lower Saxony, Germany
- * E-mail:
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TLR4 modulates inflammatory gene targets in the retina during Bacillus cereus endophthalmitis. BMC Ophthalmol 2018; 18:96. [PMID: 29661181 PMCID: PMC5902844 DOI: 10.1186/s12886-018-0764-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 04/03/2018] [Indexed: 02/07/2023] Open
Abstract
Background Endophthalmitis is a serious intraocular infection that frequently results in significant inflammation and vision loss. Because current therapeutics are often unsuccessful in mitigating damaging inflammation during endophthalmitis, more rational targets are needed. Toll-like receptors (TLRs) recognize specific motifs on invading pathogens and initiate the innate inflammatory response. We reported that TLR4 contributes to the robust inflammation which is a hallmark of Bacillus cereus endophthalmitis. To identify novel, targetable host inflammatory factors in this disease, we performed microarray analysis to detect TLR4-dependent changes to the retinal transcriptome during B. cereus endophthalmitis. Results C57BL/6 J and TLR4−/− mouse eyes were infected with B. cereus and retinas were harvested at 4 h postinfection, a time representing the earliest onset of neutrophil infiltration. Genes related to acute inflammation and inflammatory cell recruitment including CXCL1 (KC), CXCL2 (MIP2-α), CXCL10 (IP-10), CCL2 (MCP1), and CCL3 (MIP1-α)) were significantly upregulated 5-fold or greater in C57BL/6 J retinas. The immune modulator IL-6, intercellular adhesion molecule ICAM1, and the inhibitor of cytokine signal transduction SOCS3 were upregulated 25-, 11-, and 10-fold, respectively, in these retinas. LIF, which is crucial for photoreceptor cell survival, was increased 6-fold. PTGS2/COX-2, which converts arachidonic acid to prostaglandin endoperoxide H2, was upregulated 9-fold. PTX3, typically produced in response to TLR engagement, was induced 15-fold. None of the aforementioned genes were upregulated in TLR4−/− retinas following B. cereus infection. Conclusions Our results have identified a cohort of mediators driven by TLR4 that may be important in regulating pro-inflammatory and protective pathways in the retina in response to B. cereus intraocular infection. This supports the prospect that blocking the activation of TLR-based pathways might serve as alternative targets for Gram-positive and Gram-negative endophthalmitis therapies in general. Electronic supplementary material The online version of this article (10.1186/s12886-018-0764-8) contains supplementary material, which is available to authorized users.
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Abstract
Endophthalmitis is a severe eye infection that may result in permanent loss of useful vision in the affected eye. Most cases are exogenous and occur as a complication of cataract surgery, an intravitreal injection, or penetrating ocular trauma. Endogenous endophthalmitis results from hematogenous seeding of the eye by bacteria or fungi, but bacteremia or fungemia may be transient and patients may present without symptoms of systemic infection. Nearly all endophthalmitis patients present with decreased vision, and some also have eye pain. Eye examination usually reveals a hypopyon and intraocular inflammation. Diagnosis is clinical, supported by cultures of the vitreous and/or aqueous or by blood cultures in some endogenous cases. Molecular diagnostic techniques have been used in research laboratories for pathogen identification in endophthalmitis and offer the possibility of rapid diagnosis, including in culture-negative cases. Intravitreal injection of antibiotics is the most important component of treatment; some cases also benefit from surgical debridement of the vitreous by a vitrectomy. The visual outcome depends partly on the pathogen: coagulase-negative staphylococcal endophthalmitis has a better prognosis than does streptococcal endophthalmitis, for example. Endophthalmitis is a medical emergency, and prompt diagnosis and treatment are essential for saving vision.
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Affiliation(s)
- Marlene L Durand
- Departments of Medicine and Ophthalmology, Harvard Medical School, and Infectious Disease Service, Massachusetts Eye and Ear Infirmary, and Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
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35
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Callegan MC, Parkunan SM, Randall CB, Coburn PS, Miller FC, LaGrow AL, Astley RA, Land C, Oh SY, Schneewind O. The role of pili in Bacillus cereus intraocular infection. Exp Eye Res 2017; 159:69-76. [PMID: 28336259 PMCID: PMC5492386 DOI: 10.1016/j.exer.2017.03.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 03/09/2017] [Accepted: 03/16/2017] [Indexed: 12/15/2022]
Abstract
Bacterial endophthalmitis is a potentially blinding intraocular infection. The bacterium Bacillus cereus causes a devastating form of this disease which progresses rapidly, resulting in significant inflammation and loss of vision within a few days. The outer surface of B. cereus incites the intraocular inflammatory response, likely through interactions with innate immune receptors such as TLRs. This study analyzed the role of B. cereus pili, adhesion appendages located on the bacterial surface, in experimental endophthalmitis. To test the hypothesis that the presence of pili contributed to intraocular inflammation and virulence, we analyzed the progress of experimental endophthalmitis in mouse eyes infected with wild type B. cereus (ATCC 14579) or its isogenic pilus-deficient mutant (ΔbcpA-srtD-bcpB or ΔPil). One hundred CFU were injected into the mid-vitreous of one eye of each mouse. Infections were analyzed by quantifying intraocular bacilli and retinal function loss, and by histology from 0 to 12 h postinfection. In vitro growth and hemolytic phenotypes of the infecting strains were also compared. There was no difference in hemolytic activity (1:8 titer), motility, or in vitro growth (p > 0.05, every 2 h, 0-18 h) between wild type B. cereus and the ΔPil mutant. However, infected eyes contained greater numbers of wild type B. cereus than ΔPil during the infection course (p ≤ 0.05, 3-12 h). Eyes infected with wild type B. cereus experienced greater losses in retinal function than eyes infected with the ΔPil mutant, but the differences were not always significant. Eyes infected with ΔPil or wild type B. cereus achieved similar degrees of severe inflammation. The results indicated that the intraocular growth of pilus-deficient B. cereus may have been better controlled, leading to a trend of greater retinal function in eyes infected with the pilus-deficient strain. Although this difference was not enough to significantly alter the severity of the inflammatory response, these results suggest a potential role for pili in protecting B. cereus from clearance during the early stages of endophthalmitis, which is a newly described virulence mechanism for this organism and this infection.
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Affiliation(s)
- Michelle C. Callegan
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA,Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, 950 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA,Dean A. McGee Eye Institute, Oklahoma City Oklahoma USA,Corresponding author: DMEI PA-418, 608 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA. Phone: (405) 271-3674, Fax: (405) 271-8128,
| | - Salai Madhumathi Parkunan
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, 950 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA
| | - C. Blake Randall
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA
| | - Phillip S. Coburn
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA
| | - Frederick C. Miller
- Department of Cell Biology, University of Oklahoma Health Sciences Center, 950 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA
| | - Austin L. LaGrow
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA
| | - Roger A. Astley
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA
| | - Craig Land
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, 608 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA
| | - So-Young Oh
- Department of Microbiology, University of Chicago, 920 East 58
| | - Olaf Schneewind
- Department of Microbiology, University of Chicago, 920 East 58
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