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Tang X, Wei T, Guan M, Li P, Pu Y, Cheng L, Zhou Z, Fu P, Zhang L. Phospholipase A 2 induces acute kidney injury by complement mediated mitochondrial apoptosis via TNF-α/NF-κB signaling pathway. Food Chem Toxicol 2023; 172:113591. [PMID: 36581091 DOI: 10.1016/j.fct.2022.113591] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 12/20/2022] [Accepted: 12/24/2022] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Acute kidney injury (AKI) is one of common complications of wasp/bee stings. Phospholipase A2 (PLA2) is a vital pathogenic composition of wasp/bee venom. We aimed to investigate the role of complement mediated mitochondrial apoptosis in PLA2 induced AKI. MATERIALS AND METHODS PLA2 induced AKI model was established by injecting PLA2 into via tail vein on mice. The pathological changes and the microstructural changes of kidney, complement activation, inflammation and apoptosis were detected in vitro and in vivo respectively. RESULTS The results showed that PLA2 induced AKI models were successfully established in vivo and vitro. Compared with control, serum creatinine and urea nitrogen levels were elevated. Complement system activation and mitochondrial damage were observed. Expressions of IL-6, TNF-α, cleaved caspase-3 and cleaved caspase-9, and Bax/Bcl-2 increased in PLA2 induced AKI models. TNF-α/NF-κB signaling pathway activation in AKI models. CONCLUSION In the present study, PLA2 induced AKI model was first successfully established to our knowledge. The role of complement mediated mitochondrial apoptosis pathway in renal tubular epithelial cells in PLA2 induced AKI were verified in vitro and vivo.
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Affiliation(s)
- Xin Tang
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Tiantian Wei
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Mingjing Guan
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Peiyun Li
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Yajun Pu
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Lixin Cheng
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Zhifeng Zhou
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Ping Fu
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Ling Zhang
- Department of Nephrology and Kidney Research Institute, West China Hospital, Sichuan University, Chengdu, China.
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2
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Chiboub O, Capote-Yanes E, Sifaoui I, Reyes-Batlle M, Rodríguez-Expósito RL, Piñero JE, Lorenzo-Morales J. In vitro validation of the amoebicidal activity of commercial eye drops as second activity. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2021; 15:144-151. [PMID: 33684885 PMCID: PMC7940700 DOI: 10.1016/j.ijpddr.2021.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 02/25/2021] [Accepted: 02/25/2021] [Indexed: 11/28/2022]
Abstract
The validation of anti-Acanthamoeba activity of commercial eye drops has gained a great interest recently and a growing number of commercials eye drop were evaluated for their aptitude to inhibit Acanthamoeba as a second pharmacological effect. In the present study, three different eye drops, commercializing in Spain, including TobraDex, Cusimolol and Colircusi antiedema have been tested in vitro against trophozoites and cysts stage of the facultative pathogen Acanthamoeba. The alamarBlue™ method was used to evaluate both trophocidal and cysticidal properties. The most active eye drops were tested for their impact on some programmed cell death features. We found out that the cells inhibition was strain and eye drop dependent, and 5% eye drop was able to eliminate both trophozoite and cyst stage of Acanthamoeba spp. A treatment of 24 h with 5% of TobraDex or Cusimolol was able to show DNA condensation, collapse in the mitochondrial membrane potential and reduction of the ATP level production in Acanthamoeba. We could assume that the present eye drops could induce programed cell death like process in Acanthamoeba via mitochondrial pathway.
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Affiliation(s)
- Olfa Chiboub
- Instituto Universitario De Enfermedades Tropicales y Salud Pública De Canarias, Universidad De La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, La Laguna, Tenerife, Islas, Canarias, 38203, Spain; Departamento de Obstetricia, Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad De La Laguna, La Laguna, Tenerife, Spain; Red de Investigación Cooperativa en Enfermedades Tropicales (RICET), Spain
| | - Eulalia Capote-Yanes
- Instituto Universitario De Enfermedades Tropicales y Salud Pública De Canarias, Universidad De La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, La Laguna, Tenerife, Islas, Canarias, 38203, Spain; Servicio de Oftalmología, Hospital Universitario Nuestra Señora de La Candelaria, Canary Islands, Tenerife, Canarias, Spain
| | - Ines Sifaoui
- Instituto Universitario De Enfermedades Tropicales y Salud Pública De Canarias, Universidad De La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, La Laguna, Tenerife, Islas, Canarias, 38203, Spain; Departamento de Obstetricia, Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad De La Laguna, La Laguna, Tenerife, Spain; Red de Investigación Cooperativa en Enfermedades Tropicales (RICET), Spain.
| | - María Reyes-Batlle
- Instituto Universitario De Enfermedades Tropicales y Salud Pública De Canarias, Universidad De La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, La Laguna, Tenerife, Islas, Canarias, 38203, Spain; Departamento de Obstetricia, Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad De La Laguna, La Laguna, Tenerife, Spain; Red de Investigación Cooperativa en Enfermedades Tropicales (RICET), Spain
| | - Rubén L Rodríguez-Expósito
- Instituto Universitario De Enfermedades Tropicales y Salud Pública De Canarias, Universidad De La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, La Laguna, Tenerife, Islas, Canarias, 38203, Spain; Departamento de Obstetricia, Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad De La Laguna, La Laguna, Tenerife, Spain
| | - José E Piñero
- Instituto Universitario De Enfermedades Tropicales y Salud Pública De Canarias, Universidad De La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, La Laguna, Tenerife, Islas, Canarias, 38203, Spain; Departamento de Obstetricia, Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad De La Laguna, La Laguna, Tenerife, Spain; Red de Investigación Cooperativa en Enfermedades Tropicales (RICET), Spain.
| | - Jacob Lorenzo-Morales
- Instituto Universitario De Enfermedades Tropicales y Salud Pública De Canarias, Universidad De La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, La Laguna, Tenerife, Islas, Canarias, 38203, Spain; Departamento de Obstetricia, Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad De La Laguna, La Laguna, Tenerife, Spain; Red de Investigación Cooperativa en Enfermedades Tropicales (RICET), Spain.
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Wang Z, Wu D, Tachibana H, Feng M, Cheng XJ. Identification and biochemical characterisation of Acanthamoeba castellanii cysteine protease 3. Parasit Vectors 2020; 13:592. [PMID: 33228764 PMCID: PMC7685649 DOI: 10.1186/s13071-020-04474-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 11/05/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Acanthamoeba spp. are free-living amoeba that are ubiquitously distributed in the environment. This study examines pathogenic Acanthamoeba cysteine proteases (AcCPs) belonging to the cathepsin L-family and explores the mechanism of AcCP3 interaction with host cells. METHODS Six AcCP genes were amplified by polymerase chain reaction (PCR). Quantitative real-time PCR was used to analyse the relative mRNA expression of AcCPs during the encystation process and between pre- and post-reactivated trophozoites. To further verify the role of AcCP3 in these processes, AcCP3 recombinant proteins were expressed in Escherichia coli, and the hydrolytic activity of AcCP3 was determined. The influence of the AcCP3 on the hydrolytic activity of trophozoites and the toxicity of trophozoites to human corneal epithelial cells (HCECs) was examined by inhibiting AcCP3 expression using siRNA. Furthermore, the levels of p-Raf and p-Erk were examined in HCECs following coculture with AcCP3 gene knockdown trophozoites by Western blotting. RESULTS During encystation, five out of six AcCPs exhibited decreased expression, and only AcCP6 was substantially up-regulated at the mRNA level, indicating that most AcCPs were not directly correlated to encystation. Furthermore, six AcCPs exhibited increased expression level following trophozoite reactivation with HEp-2 cells, particularly AcCP3, indicating that these AcCPs might be virulent factors. After refolding of recombinant AcCP3 protein, the 27 kDa mature protein from the 34 kDa pro-protein hydrolysed host haemoglobin, collagen and albumin and showed high activity in an acidic environment. After AcCP3 knockdown, the hydrolytic activity of trophozoite crude protein against gelatin was decreased, suggesting that these trophozoites had decreased toxicity. Compared with untreated trophozoites or negative control siRNA-treated trophozoites, AcCP3-knockdown trophozoites were less able to penetrate and damage monolayers of HCECs. Western blot analysis showed that the activation levels of the Ras/Raf/Erk/p53 signalling pathways in HCECs decreased after inhibiting the expression of trophozoite AcCP3. CONCLUSIONS AcCP6 was correlated to encystation. Furthermore, AcCP3 was a virulent factor in trophozoites and participated in the activation of the Ras/Raf/Erk/p53 signalling pathways of host cells.
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Affiliation(s)
- Zhixin Wang
- Department of Medical Microbiology and Parasitology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China
| | - Duo Wu
- Department of Medical Microbiology and Parasitology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China
| | - Hiroshi Tachibana
- Department of Infectious Diseases, Tokai University School of Medicine, Isehara, Kanagawa, 259-1193, Japan
| | - Meng Feng
- Department of Medical Microbiology and Parasitology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China.
| | - Xun-Jia Cheng
- Department of Medical Microbiology and Parasitology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China.
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Cytosolic phospholipase A 2-α participates in lipid body formation and PGE 2 release in human neutrophils stimulated with an L-amino acid oxidase from Calloselasma rhodostoma venom. Sci Rep 2020; 10:10976. [PMID: 32620771 PMCID: PMC7334223 DOI: 10.1038/s41598-020-67345-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 06/05/2020] [Indexed: 12/02/2022] Open
Abstract
Cr-LAAO, an l-amino acid oxidase isolated from Calloselasma rhodosthoma snake venom, has been demonstrated as a potent stimulus for neutrophil activation and inflammatory mediator production. However, the mechanisms involved in Cr-LAAO induced neutrophil activation has not been well characterized. Here we investigated the mechanisms involved in Cr-LAAO-induced lipid body (also known as lipid droplet) biogenesis and eicosanoid formation in human neutrophils. Using microarray analysis, we show for the first time that Cr-LAAO plays a role in the up-regulation of the expression of genes involved in lipid signalling and metabolism. Those include different members of phospholipase A2, mostly cytosolic phospholipase A2-α (cPLA2-α); and enzymes involved in prostaglandin synthesis including cyclooxygenases 2 (COX-2), and prostaglandin E synthase (PTGES). In addition, genes involved in lipid droplet formation, including perilipin 2 and 3 (PLIN 2 and 3) and diacylglycerol acyltransferase 1 (DGAT1), were also upregulated. Furthermore, increased phosphorylation of cPLA2-α, lipid droplet biogenesis and PGE2 synthesis were observed in human neutrophils stimulated with Cr-LAAO. Treatment with cPLA2-α inhibitor (CAY10650) or DGAT-1 inhibitor (A922500) suppressed lipid droplets formation and PGE2 secretion. In conclusion, we demonstrate for the first time the effects of Cr-LAAO to regulate neutrophil lipid metabolism and signalling.
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Khan NA, Anwar A, Siddiqui R. Acanthamoeba Keratitis: Current Status and Urgent Research Priorities. Curr Med Chem 2019; 26:5711-5726. [DOI: 10.2174/0929867325666180510125633] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 01/10/2018] [Accepted: 05/01/2018] [Indexed: 12/13/2022]
Abstract
Background:First discovered in the early 1970s, Acanthamoeba keratitis has remained a major eye infection and presents a significant threat to the public health, especially in developing countries. The aim is to present a timely review of our current understanding of the advances made in this field in a comprehensible manner and includes novel concepts and provides clear directions for immediate research priorities.Methods:We undertook a search of bibliographic databases for peer-reviewed research literature and also summarized our published results in this field.Results:The present review focuses on novel diagnostic and therapeutic strategies in details which can provide access to management and treatment of Acanthamoeba keratitis. This coupled with the recently available genome sequence information together with high throughput genomics technology and innovative approaches should stimulate interest in the rational design of preventative and therapeutic measures. Current treatment of Acanthamoeba keratitis is problematic and often leads to infection recurrence. Better understanding of diagnosis, pathogenesis, pathophysiology and therapeutic regimens, would lead to novel strategies in treatment and prophylaxis.
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Affiliation(s)
- Naveed Ahmed Khan
- Department of Biology, Chemistry and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, University City, Sharjah, United Arab Emirates
| | - Ayaz Anwar
- Department of Biology, Chemistry and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, University City, Sharjah, United Arab Emirates
| | - Ruqaiyyah Siddiqui
- Department of Biology, Chemistry and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, University City, Sharjah, United Arab Emirates
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6
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Neelam S, Niederkorn JY. Pathobiology and Immunobiology of Acanthamoeba Keratitis: Insights from Animal Models
. THE YALE JOURNAL OF BIOLOGY AND MEDICINE 2017; 90:261-268. [PMID: 28656012 PMCID: PMC5482302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Acanthamoeba keratitis (AK) is a rare but sight-threatening disease caused by pathogenic species of Acanthamoeba. Despite its ubiquitous nature, the incidence of AK is relatively low compared to other forms of infectious keratitis. Although contact lens wear is a major risk factor, exposure to contaminated water and ocular trauma are also associated with AK. Once a patient develops AK the prognosis is very poor unless an aggressive treatment regimen is initiated early. Some of the intriguing features of AK are the lack of immunological memory, resistance of the dormant cyst form to treatment, differences between the pathogenic strains and soil isolates of Acanthamoeba and the unique role of the innate immune system in controlling this disease. Understanding the series of steps involved in the pathogenesis of the disease and the host immune response against Acanthamoeba antigens is crucial for developing effective therapeutic strategies targeting the disease.
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Affiliation(s)
| | - Jerry Y. Niederkorn
- To whom all correspondence should be addressed: Jerry Y. Niederkorn, Department of Ophthalmology, UT Southeastern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390, Tel: 214-648-3829. Fax: 214-648-9061. .
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7
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Dubinin MV, Astashev ME, Penkov NV, Gudkov SV, Dyachenko IA, Samartsev VN, Belosludtsev KN. Effects of Phospholipase A2 Inhibitors on Bilayer Lipid Membranes. J Membr Biol 2016; 249:339-47. [DOI: 10.1007/s00232-016-9872-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 01/06/2016] [Indexed: 10/22/2022]
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Pandey R, Ghorpade A. Cytosolic phospholipase A2 regulates alcohol-mediated astrocyte inflammatory responses in HIV-associated neurocognitive disorders. Cell Death Discov 2015; 1:15045. [PMID: 27551474 PMCID: PMC4979440 DOI: 10.1038/cddiscovery.2015.45] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 09/12/2015] [Indexed: 01/09/2023] Open
Abstract
Alcohol (EtOH) abuse and HIV-1 infection remain leading public health problems not only in the United States but also across the world. Alcohol abusers have a significantly greater risk of HIV-1 infection than non-drinkers globally. In the United States, prevalence of EtOH abuse is over two-fold higher in HIV-1-positive individuals than that of the general population. Although alcohol abusers show neurodegeneration, exacerbated neuroinflammation and oxidative damage, the mechanism(s) by which EtOH regulates astrocyte inflammatory responses in HIV-associated neurocognitive disorders is unknown. Thus, we explored signaling pathway(s) involved in EtOH-mediated activation of human astrocytes with HIV-1 and subsequent alterations in their inflammatory functions. Alcohol exposure altered the morphology of astrocytes, proinflammatory responses and induced cytotoxicity in a dose-dependent manner. Time-dependent changes were also evaluated. EtOH and HIV-1 cotreatment decreased cell viability and proliferation, while increasing apoptosis and mitochondrial depolarization. EtOH and HIV-1 together increased the levels of proinflammatory molecules, interleukin-1β, tumor necrosis factor-α, CXCL8, tissue inhibitor of metalloproteinases-1 and more importantly, arachidonic acid, a known downstream target of cytosolic phospholipase A2 (cPLA2). Consistent with this observation, phospho-cPLA2 levels were augmented in HIV-1 and EtOH cotreatment as compared with HIV-1 or EtOH alone. Cyclooxygenase 2 was upregulated as measured by real-time PCR and western blot, whereas cotreatment of HIV-1 and EtOH decreased cytochrome P450-2E1 levels as compared with EtOH alone. Furthermore, we confirmed that blocking cPLA2 with arachidonyl tri floro methyl ketone, a cPLA2-specific inhibitor, effectively prevented cPLA2 phosphorylation and downstream outcomes. Thus, the present findings suggest that cPLA2 has a critical role in alcohol and HIV-induced astrocyte inflammation. In the future, cPLA2 inhibitors may present novel therapeutic tools to treat alcohol abuse and HIV-associated neurocognitive disorder comorbidity.
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Affiliation(s)
- R Pandey
- Department of Cell Biology and Immunology, University of North Texas Health Science Center , Fort Worth, TX, USA
| | - A Ghorpade
- Department of Cell Biology and Immunology, University of North Texas Health Science Center , Fort Worth, TX, USA
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9
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Lipid-Based Therapy for Ocular Surface Inflammation and Disease. Trends Mol Med 2015; 21:736-748. [PMID: 26596867 DOI: 10.1016/j.molmed.2015.10.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 10/06/2015] [Accepted: 10/07/2015] [Indexed: 12/27/2022]
Abstract
Ocular surface diseases such as dry eye, allergic keratoconjunctivitis, and infection are very prevalent conditions and involve ocular surface stress and inflammation. Recently, various lipid-based therapies have been advocated for the modulation of ocular surface inflammation. Here we review the latest developments and challenges of these strategies. These include administration of essential fatty acids, cyclooxygenase (COX) inhibitors and resolvin analogs. Lipids form part of the tear film and are crucial for tear film stability; loss of tear film stability can aggravate ocular surface inflammation. Strategies to replenish tear film lipids - namely, eyelid warming and eye drops containing natural or synthetic lipids - are evaluated. Recent advances in the use of lipids as ocular drug delivery vehicles, antioxidants, and diagnostic markers are discussed.
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11
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Feng X, Zheng W, Wang Y, Zhao D, Jiang X, Lv S. A Rabbit Model ofAcanthamoebaKeratitis That Better Reflects the Natural Human Infection. Anat Rec (Hoboken) 2015; 298:1509-17. [DOI: 10.1002/ar.23154] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 12/20/2014] [Indexed: 01/04/2023]
Affiliation(s)
- Xianmin Feng
- School of Laboratory Medicine, Jilin Medical College; Jilin China
| | - Wenyu Zheng
- Department of Hand Microsurgery; Central Hospital of Jilin City; Jilin China
| | - Yuehua Wang
- School of Laboratory Medicine, Jilin Medical College; Jilin China
- School of Basical Medicine, Jilin Medical College; Jilin China
| | - Donghai Zhao
- School of Basical Medicine, Jilin Medical College; Jilin China
| | - Xiaoming Jiang
- School of Laboratory Medicine, Jilin Medical College; Jilin China
| | - Shijie Lv
- School of Basical Medicine, Jilin Medical College; Jilin China
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He S, Zhang H, Liu S, Liu H, Chen G, Xie Y, Zhang J, Sun S, Li Z, Wang L. γδ T cells regulate the expression of cytokines but not the manifestation of fungal keratitis. Exp Eye Res 2015; 135:93-101. [PMID: 25864785 DOI: 10.1016/j.exer.2015.03.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 02/20/2015] [Accepted: 03/17/2015] [Indexed: 12/31/2022]
Abstract
As an important immunoregulatory cell type, the role of γδ T cells in fungal keratitis (FK) is unclear. We observed the distribution of γδ T cells in infected corneas in vivo by two-photon microscopy. The γδ T cells were depleted by neutralizing antibodies. The cytokine expression profile was obtained by protein arrays to determine the cytokines regulated by γδ T cells. ICAM-1, MIP-2 and IL-17A were evaluated by ELISA assays to confirm the role of γδ T cells in FK. We counted the number of neutrophils, evaluated the volume of fungal hyphae and analyzed the manifestation of the disease. The γδ T cells increased significantly at 36 h and 72 h post fungal infection (P < 0.05) and migrated from the limbus to the infection site. The neutralizing antibodies completely depleted the γδ T cells in 24 h. The depletion of γδ T cells led to up regulation of 25 cytokines and down regulation of 3 cytokines. ICAM-1, MIP-2 and IL-17A changed significantly because of the depletion of γδ T cells (P < 0.05). However, the number of neutrophils, volume of fungal hyphae and manifestation of the disease was not affected by the depletion of γδ T cells. Our results demonstrated that γδ T cells have a role in FK via regulation of some cytokines but did not affect the manifestation of this disease, suggesting that γδ T cells are not the key regulator cells in this disease.
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Affiliation(s)
- Siyu He
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Hongmin Zhang
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Susu Liu
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Hui Liu
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Guoming Chen
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Yanting Xie
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Junjie Zhang
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Shengtao Sun
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Zhijie Li
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Liya Wang
- Henan Eye Institute, Henan Eye Hospital, Ophthalmology Department of Henan Provincial People's Hospital, Ophthalmology Department of People's Hospital of Zhengzhou University, Zhengzhou, 450003, People's Republic of China.
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Lorenzo-Morales J, Khan NA, Walochnik J. An update on Acanthamoeba keratitis: diagnosis, pathogenesis and treatment. ACTA ACUST UNITED AC 2015; 22:10. [PMID: 25687209 PMCID: PMC4330640 DOI: 10.1051/parasite/2015010] [Citation(s) in RCA: 428] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 02/06/2015] [Indexed: 12/21/2022]
Abstract
Free-living amoebae of the genus Acanthamoeba are causal agents of a severe sight-threatening infection of the cornea known as Acanthamoeba keratitis. Moreover, the number of reported cases worldwide is increasing year after year, mostly in contact lens wearers, although cases have also been reported in non-contact lens wearers. Interestingly, Acanthamoeba keratitis has remained significant, despite our advances in antimicrobial chemotherapy and supportive care. In part, this is due to an incomplete understanding of the pathogenesis and pathophysiology of the disease, diagnostic delays and problems associated with chemotherapeutic interventions. In view of the devastating nature of this disease, here we present our current understanding of Acanthamoeba keratitis and molecular mechanisms associated with the disease, as well as virulence traits of Acanthamoeba that may be potential targets for improved diagnosis, therapeutic interventions and/or for the development of preventative measures. Novel molecular approaches such as proteomics, RNAi and a consensus in the diagnostic approaches for a suspected case of Acanthamoeba keratitis are proposed and reviewed based on data which have been compiled after years of working on this amoebic organism using many different techniques and listening to many experts in this field at conferences, workshops and international meetings. Altogether, this review may serve as the milestone for developing an effective solution for the prevention, control and treatment of Acanthamoeba infections.
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Affiliation(s)
- Jacob Lorenzo-Morales
- University Institute of Tropical Diseases and Public Health of the Canary Islands, University of La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, 38203 La Laguna, Tenerife, Canary Islands, Spain
| | - Naveed A Khan
- Department of Biological and Biomedical Sciences, Aga Khan University, Karachi, Pakistan
| | - Julia Walochnik
- Institute of Specific Prophylaxis and Tropical Medicine, Medical University of Vienna, Vienna, Austria
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Tripathi T, Alizadeh H. Significance of arachidonic acid in ocular infections and inflammation. INFLAMMATION AND CELL SIGNALING 2014; 1. [PMID: 26082934 DOI: 10.14800/ics.301] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Innate immune responses in the cornea mainly play an important role to mobilize multiple interrelated pathways of corneal lipid, which involve in inflammatory corneal diseases. Signaling lipid mediators derived from arachidonic acid (AA) control cell proliferation, apoptosis, metabolism, and migration, are known as eicosanoids, phosphoinositides, sphingolipids, and fatty acids. Emerging evidences have highlighted the implication of lipid mediators in both injury and repair mechanisms in the cornea. Recently, the role of AA and its metabolites to induce proinflammatory mediators and inflammatory cell infiltration in the pathogen-infected cornea and to cause severe keratitis have been revealed. In this review, we focus on the novel roles of AA downstream signaling in the corneal inflammatory diseases and also the biological relevance of AA signaling in the therapeutic strategies for targeting sight-threatening diseases.
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Affiliation(s)
- Trivendra Tripathi
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, and North Texas Eye Research Institute, Fort Worth, Texas, 76107, USA
| | - Hassan Alizadeh
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, and North Texas Eye Research Institute, Fort Worth, Texas, 76107, USA
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Tripathi T, Alizadeh H. Role of protease-activated receptors 2 (PAR2) in ocular infections and inflammation. ACTA ACUST UNITED AC 2014; 1. [PMID: 26078987 DOI: 10.14800/rci.291] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Protease-activated receptors (PARs) belong to a unique family of G protein-coupled receptors (GPCRs) that are cleaved at an activation site within the N-terminal exodomain by a variety of proteinases, essentially of the serine (Ser) proteinase family. After cleavage, the new N-terminal sequence functions as a tethered ligand, which binds intramolecularly to activate the receptor and initiate signaling. Cell signals induced through the activation of PARs appear to play a significant role in innate and adoptive immune responses of the cornea, which is constantly exposed to proteinases under physiological or pathophysiological conditions. Activation of PARs interferes with all aspects of the corneal physiology such as barrier function, transports, innate and adoptive immune responses, and functions of corneal nerves. It is not known whether the proteinase released from the microorganism can activate PARs and triggers the inflammatory responses. The role of PAR2 expressed by the corneal epithelial cells and activation by serine protease released from microorganism is discussed here. Recent evidences suggest that activation of PAR2, by the serine proteinases, play an important role in innate and inflammatory responses of the corneal infection.
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Affiliation(s)
- Trivendra Tripathi
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, and North Texas Eye Research Institute, Fort Worth, Texas, 76107, USA
| | - Hassan Alizadeh
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, and North Texas Eye Research Institute, Fort Worth, Texas, 76107, USA
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Highly selective trifluoroacetic ester/ketone metathesis: an efficient approach to trifluoromethyl ketones and esters. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.05.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Tripathi T, Abdi M, Alizadeh H. Protease-activated receptor 2 (PAR2) is upregulated by Acanthamoeba plasminogen activator (aPA) and induces proinflammatory cytokine in human corneal epithelial cells. Invest Ophthalmol Vis Sci 2014; 55:3912-21. [PMID: 24876278 DOI: 10.1167/iovs.14-14486] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
PURPOSE Acanthamoeba plasminogen activator (aPA) is a serine protease elaborated by Acanthamoeba trophozoites that facilitates the invasion of trophozoites to the host and contributes to the pathogenesis of Acanthamoeba keratitis (AK). The aim of this study was to explore if aPA stimulates proinflammatory cytokine in human corneal epithelial (HCE) cells via the protease-activated receptors (PARs) pathway. METHODS Acanthamoeba castellanii trophozoites were grown in peptone-yeast extract glucose for 7 days, and the supernatants were collected and centrifuged. The aPA was purified using the fast protein liquid chromatography system, and aPA activity was determined by zymography assays. Human corneal epithelial cells were incubated with or without aPA (100 μg/mL), PAR1 agonists (thrombin, 10 μM; TRAP-6, 10 μM), and PAR2 agonists (SLIGRL-NH2, 100 μM; AC 55541, 10 μM) for 24 and 48 hours. Inhibition of PAR1 and PAR2 involved preincubating the HCE cells for 1 hour with the antagonist of PAR1 (SCH 79797, 60 μM) and PAR2 (FSLLRY-NH2, 100 μM) with or without aPA. Human corneal epithelial cells also were preincubated with PAR1 and PAR2 antagonists and then incubated with or without PAR1 agonists (thrombin and TRAP-6) and PAR2 agonists (SLIGRL-NH2 and AC 55541). Expression of PAR1 and PAR2 was examined by quantitative RT-PCR (qRT-PCR), flow cytometry, and immunocytochemistry. Interleukin-8 expression was quantified by qRT-PCR and ELISA. RESULTS Human corneal epithelial cells constitutively expressed PAR1 and PAR2 mRNA. Acanthamoeba plasminogen activator and PAR2 agonists significantly upregulated PAR2 mRNA expression (1- and 2-fold, respectively) (P < 0.05). Protease-activated receptor 2 antagonist significantly inhibited aPA, and PAR2 agonists induced PAR2 mRNA expression in HCE cells (P < 0.05). Protease-activated receptor 1 agonists, but not aPA, significantly upregulated PAR1 mRNA expression, which was significantly inhibited by PAR1 antagonist in HCE cells. Acanthamoeba plasminogen activator and PAR2 agonists stimulated IL-8 mRNA expression and protein production, which is significantly diminished by PAR2 antagonist (P < 0.05). Protease-activated receptor 1 antagonist did not alter aPA-stimulated IL-8 mRNA expression and protein production in HCE cells. Flow cytometry and immunocytochemistry showed that aPA and SLIGRL-NH2 (PAR2 agonist) upregulated PAR2 surface protein as compared to that in unstimulated HCE cells. Thrombin, but not aPA, stimulated PAR1 surface protein in HCE cells. CONCLUSIONS Acanthamoeba plasminogen activator specifically induces expression and production of IL-8 in HCE cells via PAR2 pathway, and PAR2 antagonists may be used as a therapeutic target in AK.
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Affiliation(s)
- Trivendra Tripathi
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, and North Texas Eye Research Institute, Fort Worth, Texas, United States
| | - Mahshid Abdi
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, and North Texas Eye Research Institute, Fort Worth, Texas, United States
| | - Hassan Alizadeh
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, and North Texas Eye Research Institute, Fort Worth, Texas, United States
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Pathogenic strains of Acanthamoeba are recognized by TLR4 and initiated inflammatory responses in the cornea. PLoS One 2014; 9:e92375. [PMID: 24633052 PMCID: PMC3954866 DOI: 10.1371/journal.pone.0092375] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 02/21/2014] [Indexed: 12/18/2022] Open
Abstract
Free-living amoebae of the Acanthamoeba species are the causative agent of Acanthamoeba keratitis (AK), a sight-threatening corneal infection that causes severe pain and a characteristic ring-shaped corneal infiltrate. Innate immune responses play an important role in resistance against AK. The aim of this study is to determine if Toll-like receptors (TLRs) on corneal epithelial cells are activated by Acanthamoeba, leading to initiation of inflammatory responses in the cornea. Human corneal epithelial (HCE) cells constitutively expressed TLR1, TLR2, TLR3, TLR4, and TLR9 mRNA, and A. castellanii upregulated TLR4 transcription. Expression of TLR1, TLR2, TLR3, and TLR9 was unchanged when HCE cells were exposed to A. castellanii. IL-8 mRNA expression was upregulated in HCE cells exposed to A. castellanii. A. castellanii and lipopolysaccharide (LPS) induced significant IL-8 production by HCE cells as measured by ELISA. The percentage of total cells positive for TLR4 was higher in A. castellanii stimulated HCE cells compared to unstimulated HCE cells. A. castellanii induced upregulation of IL-8 in TLR4 expressing human embryonic kidney (HEK)-293 cells, but not TLR3 expressing HEK-293 cells. TLR4 neutralizing antibody inhibited A. castellanii-induced IL-8 by HCE and HEK-293 cells. Clinical strains but not soil strains of Acanthamoeba activated TLR4 expression in Chinese hamster corneas in vivo and in vitro. Clinical isolates but not soil isolates of Acanthamoeba induced significant (P< 0.05) CXCL2 production in Chinese hamster corneas 3 and 7 days after infection, which coincided with increased inflammatory cells in the corneas. Results suggest that pathogenic species of Acanthamoeba activate TLR4 and induce production of CXCL2 in the Chinese hamster model of AK. TLR4 may be a potential target in the development of novel treatment strategies in Acanthamoeba and other microbial infections that activate TLR4 in corneal cells.
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