Ex Vivo and In Vitro Analysis Identify a Detrimental Impact of Neutrophil Extracellular Traps on Eye Structures in Equine Recurrent Uveitis.
Abstract: Equine recurrent uveitis (ERU) is a common ocular disease of horses and described as a model for human autoimmune uveitis. This immune-mediated, inflammatory condition progressively destroys the eye, ultimately leading to blindness. Genetic and autoimmune factors, next to infections with Leptospira, are discussed as key factors in the pathogenesis. Furthermore, a release of neutrophil extracellular traps (NETs) by activated neutrophils is involved. NETs are composed of decondensed chromatin and proteins that can immobilize invading pathogens. However, if NETs accumulate, they can contribute to detrimental autoimmune processes. Thus, we aimed to investigate the impact of NETs in ERU patients. Therefore, we quantified several NET-markers (cell-free DNA, nucleosomes, citrullinated histone H3, histone-myeloperoxidase complexes, interleukin-17, equine cathelicidin 1 and DNase I activity) and NET-autoantibodies in sera and vitreous body fluids (VBF) of ERU-diseased horses and correlated the data with the disease status (signalment, ERU scores and Leptospira infection status). NET markers were detected to varying degrees in VBF of diseased horses, and partially correlated to disease severity and the presence of Leptospira spp. Cell-free DNA and nucleosomes as NET markers correlate with ERU severity in total and VBF scores, despite the presence of active DNases. Additionally, a significant correlation between fundus affection in the eye and NET autoantibodies was detectable. Therefore, we further investigated the influence of VBF samples from equine patients and isolated NETs on the blood-retina barrier in a cell culture model. VBF of diseased horses significantly induced cytotoxicity in retinal pigment epithelial cells. Moreover, partially digested NETs also resulted in cytotoxic effects. In the presence of lipopolysaccharide (LPS), the main component of the leptospiral surface, both undigested and completely digested NETs were cytotoxic. Correlations between the ERU-scores and Leptospira were also calculated. Detection of leptospiral DNA, and antibody titers of the serovar Grippotyphosa correlated with disease severity. In addition, a correlation between Leptospira and several NET markers was observed in VBF. Altogether, our findings suggest a positive correlation between NET markers with disease severity and involvement of Leptospira in the VBF of ERU-diseased horses, as well as a cytotoxic effect of NETs in eyes.
Copyright © 2022 Fingerhut, Yücel, Strutzberg-Minder, von Köckritz-Blickwede, Ohnesorge and de Buhr.
Publication Date: 2022-02-10 PubMed ID: 35251020PubMed Central: PMC8896353DOI: 10.3389/fimmu.2022.830871Google Scholar: Lookup
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Summary
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Equine recurrent uveitis (ERU) is a frequent eye disease in horses, with detrimental effects including blindness. This study examined the role of neutrophil extracellular traps (NETs) in worsening ERU’s impact, finding that NETs have a toxic effect on eye structure and increases ERU’s severity and progression. Furthermore, it was found that bacterial infection heightens NETs’ negative effects on ERU.
Background of the Study
- ERU is an inflammation of the eyes that results from an immune disorder and can progress to blindness. It’s widespread in horses and serves as a comparable model for autoimmune uveitis in humans.
- Genetic elements, autoimmune responses, and infections (specifically Leptospira) are considered significant causes of ERU.
- NETs, produced by active neutrophils, are comprised of decondensed chromatin and proteins, functioning as a defense mechanism to capture invading pathogens. However, excess accumulation of NETs can lead to detrimental autoimmune reactions, which is why this research aimed to study the impact of NETs on ERU patients.
Methods of the Study
- Researchers measureed various NET-markers and NET-autoantibodies in the blood and intraocular fluids (Vitreous Body Fluids, VBF) of horses suffering from ERU.
- This data was then correlated with the state of the disease in each horse.
- Furthermore, the study explored the effects of VBF from ERU affected horses on the blood-retina barrier using a cell culture model.
Findings of the Study
- The analysis indicated varying degrees of NET markers in the VBF of diseased horses. These markers partly correlated to disease severity and the presence of Leptospira.
- Cell-free DNA and nucleosomes, indicators of NETs, were found to correlate with ERU severity despite the presence of active DNases.
- Additionally, the research pinpointed a direct association between the extent of damage in the eye (fundus affection) and the presence of NET autoantibodies.
- The presence of Leptospiral DNA and Grippotyphosa serovar antibodies was found to directly correlate with disease severity.
- NETs and their markers were observed to be cytotoxic to retinal pigment epithelial cells, both when isolated and when present in VBF.
- A correlation between ERU disease severity and levels of Leptospira was also seen.
Conclusion of the Study
- The study concludes a strong correlation between NET markers and severity of ERU. This suggests that NETs contribute to the worsening of ERU, especially when associated with infection by Leptospira.
- It also indicates that NETs may have a cytotoxic effect on the structures of the eye, potentially contributing to progressive blindness.
Cite This Article
APA
Fingerhut L, Yücel L, Strutzberg-Minder K, von Köckritz-Blickwede M, Ohnesorge B, de Buhr N.
(2022).
Ex Vivo and In Vitro Analysis Identify a Detrimental Impact of Neutrophil Extracellular Traps on Eye Structures in Equine Recurrent Uveitis.
Front Immunol, 13, 830871.
https://doi.org/10.3389/fimmu.2022.830871 Publication
Researcher Affiliations
- Department of Biochemistry, University of Veterinary Medicine Hannover, Hannover, Germany.
- Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Hannover, Germany.
- Clinic for Horses, University of Veterinary Medicine Hannover, Hannover, Germany.
- Clinic for Horses, University of Veterinary Medicine Hannover, Hannover, Germany.
- Institute for Animal Breeding and Genetics, University of Veterinary Medicine Hannover, Hannover, Germany.
- IVD Innovative Veterinary Diagnostics (IVD GmbH), Seelze, Germany.
- Department of Biochemistry, University of Veterinary Medicine Hannover, Hannover, Germany.
- Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Hannover, Germany.
- Clinic for Horses, University of Veterinary Medicine Hannover, Hannover, Germany.
- Department of Biochemistry, University of Veterinary Medicine Hannover, Hannover, Germany.
- Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Hannover, Germany.
MeSH Terms
- Animals
- Autoantibodies
- Biomarkers
- Cell-Free Nucleic Acids
- Chronic Disease
- Extracellular Traps
- Histones
- Horse Diseases / diagnosis
- Horses
- Leptospira
- Nucleosomes
- Uveitis / veterinary
Conflict of Interest Statement
Author KS-M is employed by IVD Innovative Veterinary Diagnostics (IVD GmbH), Seelze, Germany. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
References
This article includes 115 references
- Deeg CA, Hauck SM, Amann B, Pompetzki D, Altmann F, Raith A. Equine Recurrent Uveitis–A Spontaneous Horse Model of Uveitis. Ophthalmic Res 2008 40:151–3.
- Malalana F, Stylianides A, McGowan C. Equine Recurrent Uveitis: Human and Equine Perspectives. Vet J 2015 206:22–9.
- Bansal S, Barathi VA, Iwata D, Agrawal R. Experimental Autoimmune Uveitis and Other Animal Models of Uveitis: An Update. Indian J Ophthalmol 2015 63:211–8.
- Deeg CA, Thurau SR, Gerhards H, Ehrenhofer M, Wildner G, Kaspers B. Uveitis in Horses Induced by Interphotoreceptor Retinoid-Binding Protein Is Similar to the Spontaneous Disease. Eur J Immunol 2002 32:2598–606.
- Deeg CA, Reese S, Gerhards H, Wildner G, Kaspers B. The Uveitogenic Potential of Retinal S-Antigen in Horses. Investig Opthalmol Vis Sci 2004 45:2286.
- von Borstel M, Oey L, Strutzberg-Minder K, Boevé MH, Ohnesorge B. Direct and Indirect Detection of Leptospires in Vitreal Samples of Horses With ERU. Pferdeheilkd Equine Med 2010 26:219–25.
- Gerhards H, Wollanke B. Diagnosis and Therapy of Uveitis in Horses. Pferdeheilkd Equine Med 2001 17:319–29.
- Von Borstel M, Oppen V, Glitz Frühauf, Deegen, Boevé, Ohnesorge B. Langzeitergebnisse Der Pars-Plana-Vitrektomie Bei Equiner Rezidivierender Uveitis. Pferdeheilkunde 2005 21:13–8.
- Gilger BC. Equine Recurrent Uveitis: The Viewpoint From the USA. Equine Vet J Suppl 2010 37:57–61.
- Werry H, Gerhards H. Technique and Indication for Surgical Treatment of Equine Recurrent Uveitis (ERU). Pferdeheilkd Equine Med 1991 7:321–31.
- Deeg CA, Altmann F, Hauck SM, Schoeffmann S, Amann B, Stangassinger M. Down-Regulation of Pigment Epithelium-Derived Factor in Uveitic Lesion Associates With Focal Vascular Endothelial Growth Factor Expression and Breakdown of the Blood-Retinal Barrier. Proteomics 2007 7:1540–8.
- Shechter R, London A, Schwartz M. Orchestrated Leukocyte Recruitment to Immune-Privileged Sites: Absolute Barriers Versus Educational Gates. Nat Rev Immunol 2013 13:206–18.
- Degroote RL, Deeg CA. Immunological Insights in Equine Recurrent Uveitis. Front Immunol 2021 11:609855.
- Kulbrock M, Lehner S, Metzger J, Ohnesorge B, Distl O. A Genome-Wide Association Study Identifies Risk Loci to Equine Recurrent Uveitis in German Warmblood Horses. PloS One 2013 8:e71619.
- Deeg CA, Kaspers B, Gerhards H, Thurau SR, Wollanke B, Wildner G. Immune Responses to Retinal Autoantigens and Peptides in Equine Recurrent Uveitis. Invest Ophthalmol Vis Sci 2001 42:393–8.
- Zipplies JK, Hauck SM, Eberhardt C, Hirmer S, Amann B, Stangassinger M. Miscellaneous Vitreous-Derived IgM Antibodies Target Numerous Retinal Proteins in Equine Recurrent Uveitis. Vet Ophthalmol 2012 15:57–64.
- Regan DP, Aarnio MC, Davis WS, Carmichael KP, Vandenplas ML, Lauderdale JD. Characterization of Cytokines Associated With Th17 Cells in the Eyes of Horses With Recurrent Uveitis. Vet Ophthalmol 2012 15:145–52.
- Swadzba ME, Hirmer S, Amann B, Hauck SM, Deeg CA. Vitreal IgM Autoantibodies Target Neurofilament Medium in a Spontaneous Model of Autoimmune Uveitis. Investig Ophthalmol Vis Sci 2012 53:294–300.
- Kulbrock M, von Borstel M, Rohn K, Distl O, Ohnesorge B. Occurrence and Severity of Equine Recurrent Uveitis in Warmblood Horses - A Comparative Study. Pferdeheilkd Equine Med 2016 29:27–36.
- Dorrego-Keiter E, Tóth J, Dikker L, Sielhorst J, Schusser GF. Kultureller Nachweis Von Leptospiren in Glaskörperflüssigkeit Und Antikörpernachweis Gegen Leptospiren in Glaskörperflüssigkeit Und Serum Von 225 Pferden Mit Equiner Rezidivierender Uveitis (ERU). Berl Munch Tierarztl Wochenschr 2016 129:209–15.
- Vincent AT, Schiettekatte O, Goarant C, Neela VK, Bernet E, Thibeaux R. Revisiting the Taxonomy and Evolution of Pathogenicity of the Genus Leptospira Through the Prism of Genomics. PloS Negl Trop Dis 2019 13:e0007270.
- Gesell-May S, Brem S, Wollanke B, Gerhards H. Examination of Equine Healthy Eyes for Intraocular Leptospiral Infection. Pferdeheilkd Equine Med 2021 37:215–24.
- Wollanke B, Rohrbach BW, Gerhards H. Serum and Vitreous Humor Antibody Titers in and Isolation of Leptospira Interrogans From Horses With Recurrent Uveitis. J Am Vet Med Assoc 2001 219:795–800.
- Wollanke B, Gerhards H, Brem S, Meyer P, Kropp H. Ätiologie Der Equinen Rezidivierenden Uveitis (ERU): Autoimmunkrankheit Oder Intraokulare Leptospireninfektion?. Pferdeheilkunde 2004 20:327–40.
- Ackermann K, Kenngott R, Settles M, Gerhards H, Maierl J, Wollanke B. In Vivo Biofilm Formation of Pathogenic Leptospira Spp. In the Vitreous Humor of Horses With Recurrent Uveitis. Microorganisms 2021 9:1–14.
- Verma A, Artiushin S, Matsunaga J, Haake DA, Timoney JF. LruA and LruB, Novel Lipoproteins of Pathogenic Leptospira Interrogans Associated With Equine Recurrent Uveitis. Infect Immun 2005 73:7259–66.
- Verma A, Kumar P, Babb K, Timoney JF, Stevenson B. Cross-Reactivity of Antibodies Against Leptospiral Recurrent Uveitis-Associated Proteins A and B (LruA and LruB) With Eye Proteins. PloS Negl Trop Dis 2010 4:e778.
- Zipplies JK, Kirschfink M, Amann B, Hauck SM, Stangassinger M, Deeg CA. Complement Factor B Expression Profile in a Spontaneous Uveitis Model. Immunobiology 2010 215:949–55.
- Gilger BC, Malok E, Cutter KV, Stewart T, Horohov DW, Allen JB. Characterization of T-Lymphocytes in the Anterior Uvea of Eyes With Chronic Equine Recurrent Uveitis. Vet Immunol Immunopathol 1999 71:17–28.
- Wiedemann C, Amann B, Degroote RL, Witte T, Deeg CA. Aberrant Migratory Behavior of Immune Cells in Recurrent Autoimmune Uveitis in Horses. Front Cell Dev Biol 2020 8:101.
- Witkowski L, Cywinska A, Paschalis-Trela K, Crisman M, Kita J. Multiple Etiologies of Equine Recurrent Uveitis - A Natural Model for Human Autoimmune Uveitis: A Brief Review. Comp Immunol Microbiol Infect Dis 2016 44:14–20.
- von Engelhardt W, Breves G, Diener M, Gäbel G. Physiologie Der Haustiere. 5th. Stuttgart: Georg Thieme Verlag; 2015.
- Weigand M, Hauck SM, Deeg CA, Degroote RL. Deviant Proteome Profile of Equine Granulocytes Associates to Latent Activation Status in Organ Specific Autoimmune Disease. J Proteomics 2021 230:103989.
- Fingerhut L, Ohnesorge B, von Borstel M, Schumski A, Strutzberg-Minder K, Mörgelin M. Neutrophil Extracellular Traps in the Pathogenesis of Equine Recurrent Uveitis (ERU). Cells 2019 8:1528.
- Brinkmann V. Neutrophil Extracellular Traps Kill Bacteria. Sci (80- ) 2004 303:1532–5.
- Fuchs TA, Abed U, Goosmann C, Hurwitz R, Schulze I, Wahn V. Novel Cell Death Program Leads to Neutrophil Extracellular Traps. J Cell Biol 2007 176:231–41.
- Metzler KD, Fuchs TA, Nauseef WM, Reumaux D, Roesler J, Schulze I. Myeloperoxidase Is Required for Neutrophil Extracellular Trap Formation: Implications for Innate Immunity. Blood 2011 117:953–9.
- Neumann A, Völlger L, Berends ETM, Molhoek EM, Stapels DAC, Midon M. Novel Role of the Antimicrobial Peptide LL-37 in the Protection of Neutrophil Extracellular Traps Against Degradation by Bacterial Nucleases. J Innate Immun 2014 6:860–8.
- Neumann A, Berends ETM, Nerlich A, Molhoek EM, Gallo RL, Meerloo T. The Antimicrobial Peptide LL-37 Facilitates the Formation of Neutrophil Extracellular Traps. Biochem J 2014 464:3–11.
- Saffarzadeh M, Juenemann C, Queisser MA, Lochnit G, Barreto G, Galuska SP. Neutrophil Extracellular Traps Directly Induce Epithelial and Endothelial Cell Death: A Predominant Role of Histones. PloS One 2012 7:e32366.
- Handono K, Sidarta YO, Pradana BA, Nugroho RA, Hartono IA, Kalim H. Vitamin D Prevents Endothelial Damage Induced by Increased Neutrophil Extracellular Traps Formation in Patients With Systemic Lupus Erythematosus. Acta Med Indones 2014 46:189–98.
- Lv D, Xu Y, Cheng H, Ke Y, Zhang X, Ying K. A Novel Cell-Based Assay for Dynamically Detecting Neutrophil Extracellular Traps-Induced Lung Epithelial Injuries. Exp Cell Res 2020 394:112101.
- Fuchs TA, Brill A, Duerschmied D, Schatzberg D, Monestier M, Myers DD. Extracellular DNA Traps Promote Thrombosis. Proc Natl Acad Sci 2010 107:15880–5.
- Grilz E, Mauracher L, Posch F, Königsbrügge O, Zöchbauer-Müller S, Marosi C. Citrullinated Histone H3, a Biomarker for Neutrophil Extracellular Trap Formation, Predicts the Risk of Mortality in Patients With Cancer. Br J Haematol 2019 186:311–20.
- Hakkim A, Furnrohr BG, Amann K, Laube B, Abed UA, Brinkmann V. Impairment of Neutrophil Extracellular Trap Degradation Is Associated With Lupus Nephritis. Proc Natl Acad Sci 2010 107:9813–8.
- An S, Raju I, Surenkhuu B, Kwon J-E, Gulati S, Karaman M. Neutrophil Extracellular Traps (NETs) Contribute to Pathological Changes of Ocular Graft-vs.-Host Disease (oGVHD) Dry Eye: Implications for Novel Biomarkers and Therapeutic Strategies. Ocul Surf 2019 17:589–614.
- Byrd AS, Carmona-Rivera C, O’Neil LJ, Carlucci PM, Cisar C, Rosenberg AZ. Neutrophil Extracellular Traps, B Cells, and Type I Interferons Contribute to Immune Dysregulation in Hidradenitis Suppurativa. Sci Transl Med 2019 11:1–13.
- Pratesi F, Dioni I, Tommasi C, Alcaro MC, Paolini I, Barbetti F. Antibodies From Patients With Rheumatoid Arthritis Target Citrullinated Histone 4 Contained in Neutrophils Extracellular Traps. Ann Rheum Dis 2014 73:1414–22.
- Sur Chowdhury C, Giaglis S, Walker UA, Buser A, Hahn S, Hasler P. Enhanced Neutrophil Extracellular Trap Generation in Rheumatoid Arthritis: Analysis of Underlying Signal Transduction Pathways and Potential Diagnostic Utility. Arthritis Res Ther 2014 16:R122.
- Jennette JC, Falk RJ. Pathogenesis of Antineutrophil Cytoplasmic Autoantibody-Mediated Disease. Nat Rev Rheumatol 2014 10:463–73.
- Kessenbrock K, Krumbholz M, Schönermarck U, Back W, Gross WL, Werb Z. Netting Neutrophils in Autoimmune Small-Vessel Vasculitis. Nat Med 2009 15:623–5.
- Baake EIA, Von Borstel M, Rohn K, Boevé MH, Ohnesorge B. Long-Term Ophthalmologic Examinations of Eyes With Equine Recurrent Uveitis After Pars Plana Vitrectomy. Pferdeheilkd Equine Med 2019 35:220–33.
- OIE. Leptospirosis. Manual of Diagnostic Tests and Vaccines for Terrestrial Animals Paris: World Organisation for Animal Health; 2018.
- Ferreira AS, Costa P, Rocha T, Amaro A, Vieira ML, Ahmed A. Direct Detection and Differentiation of Pathogenic Leptospira Species Using a Multi-Gene Targeted Real Time PCR Approach. PloS One 2014 9:e112312.
- Pérez LJ, Lanka S, DeShambo VJ, Fredrickson RL, Maddox CW. A Validated Multiplex Real-Time PCR Assay for the Diagnosis of Infectious Leptospira Spp.: A Novel Assay for the Detection and Differentiation of Strains From Both Pathogenic Groups I and II. Front Microbiol 2020 11:457.
- Carmona-Rivera C, Kaplan MJ. Detection of SLE Antigens in Neutrophil Extracellular Traps (NETs). Methods Mol Biol 2014 1134:151–61.
- Brogden G, Neumann A, Husein DM, Reuner F, Naim HY, von Köckritz-Blickwede M. Methods to Study Lipid Alterations in Neutrophils and the Subsequent Formation of Neutrophil Extracellular Traps. J Vis Exp 2017 (121):e54667.
- Murcia RY, Vargas A, Lavoie J-P. The Interleukin-17 Induced Activation and Increased Survival of Equine Neutrophils Is Insensitive to Glucocorticoids. PloS One 2016 11:e0154755.
- Zhang Y, Chandra V, Sanchez ER, Dutta P, Quesada PR, Rakoski A. Interleukin-17-Induced Neutrophil Extracellular Traps Mediate Resistance to Checkpoint Blockade in Pancreatic Cancer. J Exp Med 2020 217(12): e20190354.
- Lande R, Ganguly D, Facchinetti V, Frasca L, Conrad C, Gregorio J. Neutrophils Activate Plasmacytoid Dendritic Cells by Releasing Self-DNA-Peptide Complexes in Systemic Lupus Erythematosus. Sci Transl Med 2011 3:73ra19–9.
- Borissoff JI, Joosen IA, Versteylen MO, Brill A, Fuchs TA, Savchenko AS. Elevated Levels of Circulating DNA and Chromatin Are Independently Associated With Severe Coronary Atherosclerosis and a Prothrombotic State. Arterioscler Thromb Vasc Biol 2013 33:2032–40.
- Aucamp J, Bronkhorst AJ, Badenhorst CPS, Pretorius PJ. The Diverse Origins of Circulating Cell-Free DNA in the Human Body: A Critical Re-Evaluation of the Literature. Biol Rev 2018 93:1649–83.
- Butt AN, Swaminathan R. Overview of Circulating Nucleic Acids in Plasma/Serum. Ann N Y Acad Sci 2008 1137:236–42.
- von Köckritz-Blickwede M, Goldmann O, Thulin P, Heinemann K, Norrby-Teglund A, Rohde M. Phagocytosis-Independent Antimicrobial Activity of Mast Cells by Means of Extracellular Trap Formation. Blood 2008 111:3070–80.
- Aulik NA, Hellenbrand KM, Czuprynski CJ. Mannheimia Haemolytica and Its Leukotoxin Cause Macrophage Extracellular Trap Formation by Bovine Macrophages. Infect Immun 2012 80:1923–33.
- Rocha Arrieta YC, Rojas M, Vasquez G, Lopez J. The Lymphocytes Stimulation Induced DNA Release, a Phenomenon Similar to NETosis. Scand J Immunol 2017 86:229–38.
- Ingelsson B, Söderberg D, Strid T, Söderberg A, Bergh A-C, Loitto V. Lymphocytes Eject Interferogenic Mitochondrial DNA Webs in Response to CpG and Non-CpG Oligodeoxynucleotides of Class C. Proc Natl Acad Sci USA 2018 115:E478–87.
- Costanza M, Poliani PL, Portararo P, Cappetti B, Musio S, Pagani F. DNA Threads Released by Activated CD4+ T Lymphocytes Provide Autocrine Costimulation. Proc Natl Acad Sci USA 2019 116:8985–94.
- Koh CC, Wardini AB, Vieira M, Passos LSA, Martinelli PM, Neves EGA. Human CD8+ T Cells Release Extracellular Traps Co-Localized With Cytotoxic Vesicles That Are Associated With Lesion Progression and Severity in Human Leishmaniasis. Front Immunol 2020 11:594581.
- Romeike A, Brügmann M, Drommer W. Immunohistochemical Studies in Equine Recurrent Uveitis (ERU). Vet Pathol 1998 35:515–26.
- Thålin C, Daleskog M, Göransson SP, Schatzberg D, Lasselin J, Laska A-C. Validation of an Enzyme-Linked Immunosorbent Assay for the Quantification of Citrullinated Histone H3 as a Marker for Neutrophil Extracellular Traps in Human Plasma. Immunol Res 2017 65:706–12.
- Chu SAA, Stokol T. Assay Variability and Storage Stability of the Myeloperoxidase Index of the ADVIA 2120i Hematology Analyzer in Canine and Equine Whole Blood Samples. Vet Clin Pathol 2021 50:28–36.
- Neeli I, Khan SN, Radic M. Histone Deimination as a Response to Inflammatory Stimuli in Neutrophils. J Immunol 2008 180:1895–902.
- Wang Y, Li M, Stadler S, Correll S, Li P, Wang D. Histone Hypercitrullination Mediates Chromatin Decondensation and Neutrophil Extracellular Trap Formation. J Cell Biol 2009 184:205–13.
- Scocchi M, Bontempo D, Boscolo S, Tomasinsig L, Giulotto E, Zanetti M. Novel Cathelicidins in Horse Leukocytes. FEBS Lett 1999 457:459–64.
- Bruhn O, Grötzinger J, Cascorbi I, Jung S. Antimicrobial Peptides and Proteins of the Horse - Insights Into a Well-Armed Organism. Vet Res 2011 42:98.
- Deeg CA, Amann B, Raith AJ, Kaspers B. Inter- and Intramolecular Epitope Spreading in Equine Recurrent Uveitis. Invest Ophthalmol Vis Sci 2006 47:652–6.
- Singh VK, Yamaki K, Donoso LA, Shinohara T. Molecular Mimicry. Yeast Histone H3-Induced Experimental Autoimmune Uveitis. J Immunol 1989 142:1512–7.
- Cunha-Vaz JG. The Blood-Retinal Barriers. Doc Ophthalmol 1976 41:287–327.
- Simó R, Villarroel M, Corraliza L, Hernández C, Garcia-Ramírez M. The Retinal Pigment Epithelium: Something More Than a Constituent of the Blood-Retinal Barrier–Implications for the Pathogenesis of Diabetic Retinopathy. J BioMed Biotechnol 2010 2010:190724.
- Deeg CA, Ehrenhofer M, Thurau SR, Reese S, Wildner G, Kaspers B. Immunopathology of Recurrent Uveitis in Spontaneously Diseased Horses. Exp Eye Res 2002 75:127–33.
- De Schaepdrijver L, Simoens P, Lauwers H, De Geest JP. Retinal Vascular Patterns in Domestic Animals. Res Vet Sci 1989 47:34–42.
- Gourlay CW, Ayscough KR. The Actin Cytoskeleton in Ageing and Apoptosis. FEMS Yeast Res 2005 5:1193–8.
- Inumaru J, Nagano O, Takahashi E, Ishimoto T, Nakamura S, Suzuki Y. Molecular Mechanisms Regulating Dissociation of Cell-Cell Junction of Epithelial Cells by Oxidative Stress. Genes Cells 2009 14:703–16.
- Kawano H, Ito T, Yamada S, Hashiguchi T, Maruyama I, Hisatomi T. Toxic Effects of Extracellular Histones and Their Neutralization by Vitreous in Retinal Detachment. Lab Invest 2014 94:569–85.
- Tsourouktsoglou T-D, Warnatsch A, Ioannou M, Hoving D, Wang Q, Papayannopoulos V. Histones, DNA, and Citrullination Promote Neutrophil Extracellular Trap Inflammation by Regulating the Localization and Activation of TLR4. Cell Rep 2020 31:107602.
- Kumar SVR, Kulkarni OP, Mulay SR, Darisipudi MN, Romoli S, Thomasova D. Neutrophil Extracellular Trap-Related Extracellular Histones Cause Vascular Necrosis in Severe GN. J Am Soc Nephrol 2015 26:2399–413.
- Xu J, Zhang X, Pelayo R, Monestier M, Ammollo CT, Semeraro F. Extracellular Histones Are Major Mediators of Death in Sepsis. Nat Med 2009 15:1318–21.
- Abrams ST, Zhang N, Manson J, Liu T, Dart C, Baluwa F. Circulating Histones Are Mediators of Trauma-Associated Lung Injury. Am J Respir Crit Care Med 2013 187:160–9.
- Marsman G, von Richthofen H, Bulder I, Lupu F, Hazelzet J, Luken BM. DNA and Factor VII–activating Protease Protect Against the Cytotoxicity of Histones. Blood Adv 2017 1:2491–502.
- Gauthier VJ, Tyler LN, Mannik M. Blood Clearance Kinetics and Liver Uptake of Mononucleosomes in Mice. J Immunol 1996 156:1151–6.
- Marsman G, Zeerleder S, Luken BM. Extracellular Histones, Cell-Free DNA, or Nucleosomes: Differences in Immunostimulation. Cell Death Dis 2016 7:e2518–8.
- Allam R, Kumar SVR, Darisipudi MN, Anders H-J. Extracellular Histones in Tissue Injury and Inflammation. J Mol Med (Berl) 2014 92:465–72.
- Silk E, Zhao H, Weng H, Ma D. The Role of Extracellular Histone in Organ Injury. Cell Death Dis 2017 8:e2812.
- Bulach DM, Kalambaheti T, de la Pena-Moctezuma A, Adler B. Lipopolysaccharide Biosynthesis in Leptospira. J Mol Microbiol Biotechnol 2000 2:375–80.
- Mookherjee N, Brown KL, Bowdish DME, Doria S, Falsafi R, Hokamp K. Modulation of the TLR-Mediated Inflammatory Response by the Endogenous Human Host Defense Peptide LL-37. J Immunol 2006 176:2455–64.
- Mateos MV, Kamerbeek CB, Giusto NM, Salvador GA. The Phospholipase D Pathway Mediates the Inflammatory Response of the Retinal Pigment Epithelium. Int J Biochem Cell Biol 2014 55:119–28.
- Leung KW, Barnstable CJ, Tombran-Tink J. Bacterial Endotoxin Activates Retinal Pigment Epithelial Cells and Induces Their Degeneration Through IL-6 and IL-8 Autocrine Signaling. Mol Immunol 2009 46:1374–86.
- Pollreisz A, Rafferty B, Kozarov E, Lalla E. Klebsiella Pneumoniae Induces an Inflammatory Response in Human Retinal-Pigmented Epithelial Cells. Biochem Biophys Res Commun 2012 418:33–7.
- Bermúdez V, Tenconi PE, Giusto NM, Mateos MV. Lipopolysaccharide-Induced Autophagy Mediates Retinal Pigment Epithelium Cells Survival. Modulation by the Phospholipase D Pathway. Front Cell Neurosci 2019 13:154.
- Martinez-Zamudio R, Ha HC. Histone ADP-Ribosylation Facilitates Gene Transcription by Directly Remodeling Nucleosomes. Mol Cell Biol 2012 32:2490–502.
- Pieterse E, Rother N, Yanginlar C, Hilbrands LB, van der Vlag J. Neutrophils Discriminate Between Lipopolysaccharides of Different Bacterial Sources and Selectively Release Neutrophil Extracellular Traps. Front Immunol 2016 7:484.
- Callegan MC, Booth MC, Jett BD, Gilmore MS. Pathogenesis of Gram-Positive Bacterial Endophthalmitis. Infect Immun 1999 67:3348–56.
- Vieira ML, Teixeira AF, Pidde G, Ching ATC, Tambourgi DV, Nascimento ALTO. Leptospira Interrogans Outer Membrane Protein Lipl21 Is a Potent Inhibitor of Neutrophil Myeloperoxidase. Virulence 2018 9:414–25.
- Scharrig E, Carestia A, Ferrer MF, Cédola M, Pretre G, Drut R. Neutrophil Extracellular Traps Are Involved in the Innate Immune Response to Infection With Leptospira. PloS Negl Trop Dis 2015 9:e0003927.
- Kumar A, Varma VP, Faisal SM. Screening of Surface Exposed Lipoproteins of Leptospira Involved in Modulation of Host Innate Immune Response. bioRxiv 2021 2021.08.20.457056.
- Wiehen LE. Retrospektive Analyse Zum Vorkommen Der Equinen Rezidiveirenden Uveitis - Unter Berücksichtigung Der Leptospireninfektion - an Der LMU München Von 01/2005 - 06/2012. München, LMU: Vet med Fak, Diss; 2012.
- Brandes K, Wollanke B, Niedermaier G, Brem S, Gerhards H. ERU Vitreal Examination With Ultrastructural Detection of Leptospira. J Vet Med 2007 275:270–5.
- Wilson-Welder JH, Frank AT, Hornsby RL, Olsen SC, Alt DP. Interaction of Bovine Peripheral Blood Polymorphonuclear Cells and Leptospira Species; Innate Responses in the Natural Bovine Reservoir Host. Front Microbiol 2016 7:1110.
- Friggeri A, Banerjee S, Xie N, Cui H, De Freitas A, Zerfaoui M. Extracellular Histones Inhibit Efferocytosis. Mol Med 2012 18:825–33.
- Pradhan VD, Badakere SS, Bichile LS, Almeida AF. Anti-Neutrophil Cytoplasmic Antibodies (ANCA) in Systemic Lupus Erythematosus: Prevalence, Clinical Associations and Correlation With Other Autoantibodies. J Assoc Physicians India 2004 52:533–7.
- Zuo Y, Yalavarthi S, Gockman K, Madison JA, Gudjonsson JE, Kahlenberg JM. Anti-Neutrophil Extracellular Trap Antibodies and Impaired Neutrophil Extracellular Trap Degradation in Antiphospholipid Syndrome. Arthritis Rheumatol (Hoboken NJ) 2020 72:2130–5.
- Khandpur R, Carmona-Rivera C, Vivekanandan-Giri A, Gizinski A, Yalavarthi S, Knight JS. NETs Are a Source of Citrullinated Autoantigens and Stimulate Inflammatory Responses in Rheumatoid Arthritis. Sci Transl Med 2013 5:178ra40–178ra40.
- Hytti M, Piippo N, Korhonen E, Honkakoski P, Kaarniranta K, Kauppinen A. Fisetin and Luteolin Protect Human Retinal Pigment Epithelial Cells From Oxidative Stress-Induced Cell Death and Regulate Inflammation. Sci Rep 2016 5:17645.
- Faghiri Z, Bazan NG. PI3K/Akt and mTOR/P70s6k Pathways Mediate Neuroprotectin D1-Induced Retinal Pigment Epithelial Cell Survival During Oxidative Stress-Induced Apoptosis. Exp Eye Res 2010 90:718–25.
Citations
This article has been cited 8 times.- Sprenzel CJ, Amann B, Deeg CA, Degroote RL. Glycan Signatures on Neutrophils in an Equine Model for Autoimmune Uveitis. Biomolecules 2025 Oct 12;15(10).
- Meiseberg LK, Mergani A, Delarocque J, Imker R, Köhn D, Wanes D, Bonilla MC, Veldhuizen EJA, von Köckritz-Blickwede M, Ohnesorge B, de Buhr N. Equine Asthma Is Characterised by Severity-Dependent Correlations Between Blood Neutrophil Cholesterol Content and NET Formation. Eur J Immunol 2025 Oct;55(10):e70072.
- Lassnig S, Hennig-Pauka I, Bonilla MC, Mörgelin M, Imker R, von Köckritz-Blickwede M, de Buhr N. Impact of bronchoalveolar lavage from influenza A virus diseased pigs on neutrophil functions and growth of co-infecting pathogenic bacteria. Front Immunol 2024;15:1325269.
- Degroote RL, Schmalen A, Hauck SM, Deeg CA. Unveiling Differential Responses of Granulocytes to Distinct Immunostimulants with Implications in Autoimmune Uveitis. Biomedicines 2023 Dec 20;12(1).
- Adeeb S, Arabi TZ, Shah H, Alsalameh S, Abu-Shaar M, El-Sibai AM, Alkattan K, Yaqinuddin A. Unveiling the Web: Exploring the Multifaceted Role of Neutrophil Extracellular Traps in Ocular Health and Disease. J Clin Med 2024 Jan 17;13(2).
- Birckhead EM, Das S, Tidd N, Raidal SL, Raidal SR. Visualizing neutrophil extracellular traps in septic equine synovial and peritoneal fluid samples using immunofluorescence microscopy. J Vet Diagn Invest 2023 Nov;35(6):751-760.
- Zeng J, Wu M, Zhou Y, Zhu M, Liu X. Neutrophil Extracellular Traps (NETs) in Ocular Diseases: An Update. Biomolecules 2022 Oct 8;12(10).
- Strutzberg-Minder K, Ullerich A, Dohmann K, Boehmer J, Goris M. Comparison of Two Leptospira Type Strains of Serovar Grippotyphosa in Microscopic Agglutination Test (MAT) Diagnostics for the Detection of Infections with Leptospires in Horses, Dogs and Pigs. Vet Sci 2022 Aug 29;9(9).
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