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Johnson WL, Sohn M, Woeller CF, Wozniak RAF. Staphylococcal Enterotoxins Promote Virulence in Bacterial Keratitis. Invest Ophthalmol Vis Sci 2023; 64:5. [PMID: 37133835 PMCID: PMC10166116 DOI: 10.1167/iovs.64.5.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
Purpose Staphylococcus aureus is an important cause of corneal infections (keratitis). To better understand the virulence mechanisms mediating keratitis, a recent comparative genomics study revealed that a set of secreted enterotoxins were found with higher prevalence among ocular versus non-ocular S. aureus clinical infection isolates, suggesting a key role for these toxins in keratitis. Although well known to cause toxic shock syndrome and S. aureus food poisoning, enterotoxins have not yet been shown to mediate virulence in keratitis. Methods A set of clinical isolate test strains, including a keratitis isolate that encodes five enterotoxins (sed, sej, sek, seq, ser), its corresponding enterotoxin deletion mutant and complementation strain, a keratitis isolate devoid of enterotoxins, and the non-ocular S. aureus strain USA300 along with its corresponding enterotoxin deletion and complementation strains, were evaluated for cellular adhesion, invasion and cytotoxicity in a primary corneal epithelial model as well as with microscopy. Additionally, strains were evaluated in an in vivo model of keratitis to quantify enterotoxin gene expression and measure disease severity. Results We demonstrate that, although enterotoxins do not impact bacterial adhesion or invasion, they do elicit direct cytotoxicity in vitro toward corneal epithelial cells. In an in vivo model, sed, sej, sek, seq, ser were found to have variable gene expression across 72 hours of infection and test strains encoding enterotoxins resulted in increased bacterial burden as well as a reduced host cytokine response. Conclusions Our results support a novel role for staphylococcal enterotoxins in promoting virulence in S. aureus keratitis.
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Affiliation(s)
- William L Johnson
- Department of Ophthalmology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
| | - Michael Sohn
- Department of Biostatistics and Computational Biology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
| | - Collynn F Woeller
- Department of Ophthalmology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
| | - Rachel A F Wozniak
- Department of Ophthalmology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
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2
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Exploring the Role of Staphylococcus aureus in Inflammatory Diseases. Toxins (Basel) 2022; 14:toxins14070464. [PMID: 35878202 PMCID: PMC9318596 DOI: 10.3390/toxins14070464] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 06/23/2022] [Accepted: 07/01/2022] [Indexed: 02/04/2023] Open
Abstract
Staphylococcus aureus is a very common Gram-positive bacterium, and S. aureus infections play an extremely important role in a variety of diseases. This paper describes the types of virulence factors involved, the inflammatory cells activated, the process of host cell death, and the associated diseases caused by S. aureus. S. aureus can secrete a variety of enterotoxins and other toxins to trigger inflammatory responses and activate inflammatory cells, such as keratinocytes, helper T cells, innate lymphoid cells, macrophages, dendritic cells, mast cells, neutrophils, eosinophils, and basophils. Activated inflammatory cells can express various cytokines and induce an inflammatory response. S. aureus can also induce host cell death through pyroptosis, apoptosis, necroptosis, autophagy, etc. This article discusses S. aureus and MRSA (methicillin-resistant S. aureus) in atopic dermatitis, psoriasis, pulmonary cystic fibrosis, allergic asthma, food poisoning, sarcoidosis, multiple sclerosis, and osteomyelitis. Summarizing the pathogenic mechanism of Staphylococcus aureus provides a basis for the targeted treatment of Staphylococcus aureus infection.
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3
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Schuler F, Barth PJ, Niemann S, Schaumburg F. A Narrative Review on the Role of Staphylococcus aureus Bacteriuria in S. aureus Bacteremia. Open Forum Infect Dis 2021; 8:ofab158. [PMID: 34189162 PMCID: PMC8233567 DOI: 10.1093/ofid/ofab158] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 03/25/2021] [Indexed: 11/12/2022] Open
Abstract
Staphylococcus aureus bacteriuria (SABU) can occur in patients with S. aureus bacteremia (SAB). However, little is known on the (molecular) pathomechanisms of the renal passage of S. aureus. This review discusses the epidemiology and pathogenesis of SABU in patients with SAB and identifies knowledge gaps. The literature search was restricted to the English language. The prevalence of SABU in patients with SAB is 7.8%-39% depending on the study design. The main risk factor for SABU is urinary tract catheterization. SABU in SAB patients is associated with increased mortality. Given present evidence, hematogenous seeding-as seen in animal models-and the development of micro-abscesses best describe the translocation of S. aureus from blood to urine. Virulence factors that might be involved are adhesion factors, sortase A, and coagulase, among others. Other potential routes of bacterial translocation (eg, transcytosis, paracytosis, translocation via "Trojan horses") were identified as knowledge gaps.
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Affiliation(s)
- Franziska Schuler
- Institute of Medical Microbiology, University Hospital Münster, Münster, Germany
| | - Peter J Barth
- Gerhard Domagk Institute of Pathology, University Hospital Münster, Münster, Germany
| | - Silke Niemann
- Institute of Medical Microbiology, University Hospital Münster, Münster, Germany
| | - Frieder Schaumburg
- Institute of Medical Microbiology, University Hospital Münster, Münster, Germany
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4
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Soe YM, Bedoui S, Stinear TP, Hachani A. Intracellular Staphylococcus aureus and host cell death pathways. Cell Microbiol 2021; 23:e13317. [PMID: 33550697 DOI: 10.1111/cmi.13317] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 01/22/2021] [Accepted: 01/23/2021] [Indexed: 12/13/2022]
Abstract
Staphylococcus aureus is a major opportunistic human pathogen that is globally prevalent. Although S. aureus and humans may have co-evolved to the point of commensalism, the bacterium is equipped with virulence factors causing devastating infections. The adoption of an intracellular lifestyle by S. aureus is an important facet of its pathogenesis. Occupying a privileged intracellular compartment permits evasion from the bactericidal actions of host immunity and antibiotics. However, this localization exposes S. aureus to cell-intrinsic processes comprising autophagy, metabolic challenges and clearance mechanisms orchestrated by host programmed cell death pathways (PCDs), including apoptosis, pyroptosis and necroptosis. Mounting evidence suggests that S. aureus deploys pathoadaptive mechanisms that modulate the expression of its virulence factors to prevent elimination through PCD pathways. In this review, we critically analyse the current literature on the interplay between S. aureus virulence factors with the key, intertwined nodes of PCD. We discuss how S. aureus adaptation to the human host plays an essential role in the evasion of PCD, and we consider future directions to study S. aureus-PCD interactions.
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Affiliation(s)
- Ye Mon Soe
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Sammy Bedoui
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Timothy P Stinear
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Abderrahman Hachani
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
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5
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Missiakas D, Winstel V. Selective Host Cell Death by Staphylococcus aureus: A Strategy for Bacterial Persistence. Front Immunol 2021; 11:621733. [PMID: 33552085 PMCID: PMC7859115 DOI: 10.3389/fimmu.2020.621733] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 12/03/2020] [Indexed: 12/12/2022] Open
Abstract
Host cell death programs are fundamental processes that shape cellular homeostasis, embryonic development, and tissue regeneration. Death signaling and downstream host cell responses are not only critical to guide mammalian development, they often act as terminal responses to invading pathogens. Here, we briefly review and contrast how invading pathogens and specifically Staphylococcus aureus manipulate apoptotic, necroptotic, and pyroptotic cell death modes to establish infection. Rather than invading host cells, S. aureus subverts these cells to produce diffusible molecules that cause death of neighboring hematopoietic cells and thus shapes an immune environment conducive to persistence. The exploitation of cell death pathways by S. aureus is yet another virulence strategy that must be juxtaposed to mechanisms of immune evasion, autophagy escape, and tolerance to intracellular killing, and brings us closer to the true portrait of this pathogen for the design of effective therapeutics and intervention strategies.
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Affiliation(s)
- Dominique Missiakas
- Howard Taylor Ricketts Laboratory, Department of Microbiology, University of Chicago, Lemont, IL, United States
| | - Volker Winstel
- Research Group Pathogenesis of Bacterial Infections, TWINCORE, Centre for Experimental and Clinical Infection Research, a joint venture between the Hannover Medical School and the Helmholtz Centre for Infection Research, Hannover, Germany
- Institute of Medical Microbiology and Hospital Epidemiology, Hannover Medical School, Hannover, Germany
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Maleki F, Sadeghifard N, Sedighian H, Bakhtiyari S, Hosseini HM, Fooladi AAI. TGFαL3-SEB fusion protein as an anticancer against ovarian cancer. Eur J Pharmacol 2020; 870:172919. [DOI: 10.1016/j.ejphar.2020.172919] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 12/23/2019] [Accepted: 01/09/2020] [Indexed: 01/22/2023]
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Patel S, Wall DM, Castillo A, McCormick BA. Caspase-3 cleavage of Salmonella type III secreted effector protein SifA is required for localization of functional domains and bacterial dissemination. Gut Microbes 2019; 10:172-187. [PMID: 30727836 PMCID: PMC6546311 DOI: 10.1080/19490976.2018.1506668] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
SifA is a bi-functional Type III Secretion System (T3SS) effector protein that plays an important role in Salmonella virulence. The N-terminal domain of SifA binds SifA-Kinesin-Interacting-Protein (SKIP), and via an interaction with kinesin, forms tubular membrane extensions called Sif filaments (Sifs) that emanate from the Salmonella Containing Vacuole (SCV). The C-terminal domain of SifA harbors a WxxxE motif that functions to mimic active host cell GTPases. Taken together, SifA functions in inducing endosomal tubulation in order to maintain the integrity of the SCV and promote bacterial dissemination. Since SifA performs multiple, unrelated functions, the objective of this study was to determine how each functional domain of SifA becomes processed. Our work demonstrates that a linker region containing a caspase-3 cleavage motif separates the two functional domains of SifA. To test the hypothesis that processing of SifA by caspase-3 at this particular site is required for function and proper localization of the effector protein domains, we developed two tracking methods to analyze the intracellular localization of SifA. We first adapted a fluorescent tag called phiLOV that allowed for type-III secretion system (T3SS) mediated delivery of SifA and observation of its intracellular colocalization with caspase-3. Additionally, we created a dual-tagging strategy that permitted tracking of each of the SifA functional domains following caspase-3 cleavage to different subcellular locations. The results of this study reveal that caspase-3 cleavage of SifA is required for the proper localization of functional domains and bacterial dissemination. Considering the importance of these events in Salmonella pathogenesis, we conclude that caspase-3 cleavage of effector proteins is a more broadly applicable effector processing mechanism utilized by Salmonella to invade and persist during infection.
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Affiliation(s)
- Samir Patel
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA, USA,CONTACT Beth McCormick Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, 368 Plantation Street AS8-2011, Worcester, MA 01605, USA
| | - Daniel M. Wall
- Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Antonio Castillo
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA, USA
| | - Beth A. McCormick
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA, USA
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Maleki F, Sadeghifard N, Hosseini HM, Bakhtiyari S, Goleij Z, Behzadi E, Sedighian H, Imani Fooladi AA. Growth-inhibitory effects of TGFαL3-SEB chimeric protein on colon cancer cell line. Biomed Pharmacother 2018; 110:190-196. [PMID: 30471512 DOI: 10.1016/j.biopha.2018.11.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 11/04/2018] [Accepted: 11/06/2018] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND TGFαL3-SEB chimeric protein is a synthetic protein, which is produced by combining the third loop (L3) of transforming growth factor-α (TGF-α) with staphylococcal enterotoxin type B. To the best of our knowledge, anti-cancer activity of this chimeric protein against colon cancer that overexpresses epidermal growth factor receptor (EGFR) has not yet been studied. Thus, in the present study, the anti-tumor effects of TGFαL3-SEB chimeric protein on HT-29 colon cancer cells were evaluated. MATERIALS AND METHODS The TGFαL3-SEB chimeric protein was previously designed and cloned in Escherichia coli (E. coli) [1,2]. The level of expression and the purity of this novel protein were examined for further analysis. For this purpose, the cells were treated with different concentrations (25, 50 and 75 μg/ml) of TGFαL3-SEB and then the proliferation was detected using the MTT assay. The apoptosis-inducing potential of TGFαL3-SEB in HT-29 and HEK-293 cells was evaluated by flow cytometry using Annexin V/PI double staining method; in addition, bax/bcl2 mRNA ratio, caspase-3 and caspase-9 activity were also assessed. RESULTS In the present study, TGFαL3-SEB chimeric protein was produced in E. coli. After effective purification, its growth inhibitory effect was evaluated. Our results indicated that the incubation of HT-29 colon cancer cell with 25, 50 and 75 μg/ml of TGFαL3-SEB for 24 h leads to significant reduction of proliferation in a dose-dependent manner (P < 0.05). Further analysis indicated that exposure of EGFR expressing HT-29 cells to TGFαL3-SEB leads to significant increase of the caspase-3 and caspase-9 activity in a concentration-dependent manner (P < 0.05). Bax/bcl-2 ratio also confirmed that TGFαL3-SEB has the pro-apoptotic effect. Flow cytometry analysis of TGFαL3-SEB treated cells showed that in addition to apoptotic cells, necrotic cells were also increased significantly at the concentration of 25, 50 and 75 μg/ml (P < 0.05). CONCLUSION In conclusion, our results demonstrated that TGFαL3-SEB chimeric protein induced cell death through both mechanisms of apoptosis and necrosis in HT-29 colon cancer cells. This paper has highlighted that TGFαL3-SEB has the potential to target EGFR expressing cancer cell.
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Affiliation(s)
- Farajolah Maleki
- Clinical Microbiology Research Center, Ilam University of Medical Sciences, Ilam, Iran
| | - Noorkhoda Sadeghifard
- Clinical Microbiology Research Center, Ilam University of Medical Sciences, Ilam, Iran.
| | - Hamideh Mahmoodzadeh Hosseini
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Salar Bakhtiyari
- Department of Clinical Biochemistry, Faculty of Medicine, Ilam University of Medical Sciences, Ilam, Iran
| | - Zoleikha Goleij
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Elham Behzadi
- Department of Microbiology, College of Basic Sciences, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran
| | - Hamid Sedighian
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Abbas Ali Imani Fooladi
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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9
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Zhang X, Hu X, Rao X. Apoptosis induced by Staphylococcus aureus toxins. Microbiol Res 2017; 205:19-24. [DOI: 10.1016/j.micres.2017.08.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 07/31/2017] [Accepted: 08/09/2017] [Indexed: 10/19/2022]
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10
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Zhang X, Shang W, Yuan J, Hu Z, Peng H, Zhu J, Hu Q, Yang Y, Liu H, Jiang B, Wang Y, Li S, Hu X, Rao X. Positive Feedback Cycle of TNFα Promotes Staphylococcal Enterotoxin B-Induced THP-1 Cell Apoptosis. Front Cell Infect Microbiol 2016; 6:109. [PMID: 27709104 PMCID: PMC5030291 DOI: 10.3389/fcimb.2016.00109] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 09/05/2016] [Indexed: 11/13/2022] Open
Abstract
Staphylococcal enterotoxin B (SEB) has been demonstrated to be of importance in Staphylococcus aureus related diseases, such as atopic dermatitis (AD). Dysregulated apoptosis in AD is remarkable, and SEB can induce apoptosis of various cell types. However, the mechanisms by which SEB induces apoptosis and influences disease processes remain unclear. In this study, the recombinant SEB-induced THP-1 monocyte apoptosis was demonstrated in the absence of preliminary cell activation in a time- and dose-dependent manner. SEB could up-regulate the expression of tumor necrosis factor alpha (TNFα) in THP-1 cells and induce apoptosis via an extrinsic pathway. TNFα could in turn increase the expression of HLA-DRa, the SEB receptor on the cell surface. As a result, a positive feedback cycle of TNFα was established. TNFα expression and SEB-induced apoptosis were decreased by knocking down the expression of either HLA-DRa or TNFR1. Therefore, the feedback cycle of TNFα is crucial for SEB functions. This work provides insights into the mechanisms of SEB-induced monocyte apoptosis and emphasizes the major role of TNFα in future related studies.
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Affiliation(s)
- Xiaopeng Zhang
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Weilong Shang
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Jizhen Yuan
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Zhen Hu
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Huagang Peng
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Junmin Zhu
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Qiwen Hu
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Yi Yang
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Hui Liu
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Bei Jiang
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Yinan Wang
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Shu Li
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Xiaomei Hu
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
| | - Xiancai Rao
- Department of Microbiology, College of Basic Medical Sciences, Third Military Medical University Chongqing, China
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11
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Abstract
Rnd3, also known as RhoE, belongs to the Rnd subclass of the Rho family of small guanosine triphosphate (GTP)-binding proteins. Rnd proteins are unique due to their inability to switch from a GTP-bound to GDP-bound conformation. Even though studies of the biological function of Rnd3 are far from being concluded, information is available regarding its expression pattern, cellular localization, and its activity, which can be altered depending on the conditions. The compiled data from these studies implies that Rnd3 may not be a traditional small GTPase. The basic role of Rnd3 is to report as an endogenous antagonist of RhoA signaling-mediated actin cytoskeleton dynamics, which specifically contributes to cell migration and neuron polarity. In addition, Rnd3 also plays a critical role in arresting cell cycle distribution, inhibiting cell growth, and inducing apoptosis and differentiation. Increasing data have shown that aberrant Rnd3 expression may be the leading cause of some systemic diseases; particularly highlighted in apoptotic cardiomyopathy, developmental arrhythmogenesis and heart failure, hydrocephalus, as well as tumor metastasis and chemotherapy resistance. Therefore, a better understanding of the function of Rnd3 under different physiological and pathological conditions, through the use of suitable models, would provide a novel insight into the origin and treatment of multiple human diseases.
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Affiliation(s)
- Wei Jie
- Department of Pathology, School of Basic Medicine Science, Guangdong Medical College, Zhanjiang, Guangdong Province, China
| | - Kelsey C Andrade
- Texas A&M University Health Science Center, Institute of Biosciences and Technology, Houston, Texas, USA
| | - Xi Lin
- Texas A&M University Health Science Center, Institute of Biosciences and Technology, Houston, Texas, USA
| | - Xiangsheng Yang
- Texas A&M University Health Science Center, Institute of Biosciences and Technology, Houston, Texas, USA
| | - Xiaojing Yue
- Texas A&M University Health Science Center, Institute of Biosciences and Technology, Houston, Texas, USA
| | - Jiang Chang
- Texas A&M University Health Science Center, Institute of Biosciences and Technology, Houston, Texas, USA
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Hammamieh R, Chakraborty N, Lin Y, Shupp JW, Miller SA, Morris S, Jett M. Characterization of the interaction of staphylococcal enterotoxin B with CD1d expressed in human renal proximal tubule epithelial cells. BMC Microbiol 2015; 15:12. [PMID: 25649790 PMCID: PMC4327782 DOI: 10.1186/s12866-015-0344-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 01/13/2015] [Indexed: 11/19/2022] Open
Abstract
Background Participation of renal cells in the pathogenesis of staphylococcal enterotoxin B (SEB) is critical for late cleansing and sequestration of the antigens facilitated by CD1d mediated antigen sensing and recognition. This is a noted deviation from the typical antigen recognition process that recruits the major histocompatibility complex class II (MHC II) molecules. The immunological importance of CD1d is underscored by its influences on the performances of natural killer T-cells and thereby mediates the innate and adaptive immune systems. Results Using diffraction-based dotReady™ immunoassays, the present study showed that SEB directly and specifically conjugated to CD1d. The specificity of the conjugation between SEB and CD1d expressed on human renal proximal tubule epithelial cells (RPTEC) was further established by selective inhibition of CD1d prior to its exposure to SEB. We found that SEB induced the expression of CD1d on the cell surface prompting a rapid conjugation between them. The mRNA transcripts encoding CD1d remained elevated potentially after completing the antigen cleansing process. Conclusion Molecular targets associated with the delayed pathogenic response have essential therapeutic values. Particularly in the event of bioterrorism, the caregivers are typically able to intervene much later than the toxic exposures. Given circumstances mandate a paradigm shift from the conventional therapeutic strategy that counts on targeting the host markers responding to the early assault of pathogens. We demonstrated the role of CD1d in the late stage of pathogen recognition and cleansing, and thereby underscored its clinical potential in treating bioweaponizable antigens, such as Staphylococcal enterotoxin B (SEB). Electronic supplementary material The online version of this article (doi:10.1186/s12866-015-0344-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rasha Hammamieh
- Integrative Systems Biology, US Army Center for Environmental Health Research Fort Detrick, 568 Doughten Drive, Fort Detrick, MD, 21702-5010, USA.
| | - Nabarun Chakraborty
- Integrative Systems Biology, US Army Center for Environmental Health Research Fort Detrick, 568 Doughten Drive, Fort Detrick, MD, 21702-5010, USA.
| | - Yixin Lin
- Axela, Inc., 50 Ronason Drive, Suite 105, Toronto, ON, M9W 1B3, Canada.
| | - Jeffrey W Shupp
- The Burn Center, Department of Surgery, Washington Hospital Center, Washington, DC, 20010, USA.
| | - Stacy-Ann Miller
- Integrative Systems Biology, US Army Center for Environmental Health Research Fort Detrick, 568 Doughten Drive, Fort Detrick, MD, 21702-5010, USA.
| | - Sam Morris
- Axela, Inc., 50 Ronason Drive, Suite 105, Toronto, ON, M9W 1B3, Canada.
| | - Marti Jett
- Integrative Systems Biology, US Army Center for Environmental Health Research Fort Detrick, 568 Doughten Drive, Fort Detrick, MD, 21702-5010, USA.
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Liu Y, Chen W, Ali T, Alkasir R, Yin J, Liu G, Han B. Staphylococcal enterotoxin H induced apoptosis of bovine mammary epithelial cells in vitro. Toxins (Basel) 2014; 6:3552-67. [PMID: 25533519 PMCID: PMC4280547 DOI: 10.3390/toxins6123552] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 12/09/2014] [Accepted: 12/15/2014] [Indexed: 02/01/2023] Open
Abstract
Staphylococcal enterotoxins (SEs) are powerful superantigenic toxins produced by Staphylococcus aureus (S. aureus). They can cause food poisoning and toxic shock. However, their impact on bovine mammary epithelial cells (bMECs) is still unknown. In this study, the distribution of SE genes was evaluated in 116 S. aureus isolates from bovine mastitis, and the most prevalent genes were seh (36.2%), followed by sei (12.1%), seg (11.2%), ser (4.3%), sec (3.4%), sea (2.6%) and sed (1.7%). To better understand the effect of staphylococcal enterotoxin H (SEH) on bMECs, the seh gene was cloned and inserted into the prokaryotic expression vector, pET28a, and transformed into Escherichia coli BL21 (DE3). The recombinant staphylococcal enterotoxin H (rSEH) was expressed and purified as soluble protein. Bioactivity analysis showed that rSEH possessed the activity of stimulating lymphocytes proliferation. The XTT assay showed that 100 μg/mL of rSEH produced the cytotoxic effect on bMECs, and fluorescence microscopy and flow cytometry analysis revealed that a certain dose of rSEH is effective at inducing bMECs apoptosis in vitro. This indicates that SEs can directly lead to cellular apoptosis of bMECs in bovine mastitis associated with S. aureus.
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Affiliation(s)
- Yongxia Liu
- Department of Clinical Medicine, College of Veterinary Medicine, China Agricultural University, Yuan Ming Yuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Wei Chen
- Department of Clinical Medicine, College of Veterinary Medicine, China Agricultural University, Yuan Ming Yuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Tariq Ali
- Department of Clinical Medicine, College of Veterinary Medicine, China Agricultural University, Yuan Ming Yuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Rashad Alkasir
- Department of Clinical Medicine, College of Veterinary Medicine, China Agricultural University, Yuan Ming Yuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Jinhua Yin
- Department of Clinical Medicine, College of Veterinary Medicine, China Agricultural University, Yuan Ming Yuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Gang Liu
- Department of Clinical Medicine, College of Veterinary Medicine, China Agricultural University, Yuan Ming Yuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Bo Han
- Department of Clinical Medicine, College of Veterinary Medicine, China Agricultural University, Yuan Ming Yuan West Road No. 2, Haidian District, Beijing 100193, China.
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Wall DM, McCormick BA. Bacterial secreted effectors and caspase-3 interactions. Cell Microbiol 2014; 16:1746-56. [PMID: 25262664 PMCID: PMC4257569 DOI: 10.1111/cmi.12368] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 09/10/2014] [Accepted: 09/15/2014] [Indexed: 12/29/2022]
Abstract
Apoptosis is a critical process that intrinsically links organism survival to its ability to induce controlled death. Thus, functional apoptosis allows organisms to remove perceived threats to their survival by targeting those cells that it determines pose a direct risk. Central to this process are apoptotic caspases, enzymes that form a signalling cascade, converting danger signals via initiator caspases into activation of the executioner caspase, caspase-3. This enzyme begins disassembly of the cell by activating DNA degrading enzymes and degrading the cellular architecture. Interaction of pathogenic bacteria with caspases, and in particular, caspase-3, can therefore impact both host cell and bacterial survival. With roles outside cell death such as cell differentiation, control of signalling pathways and immunomodulation also being described for caspase-3, bacterial interactions with caspase-3 may be of far more significance in infection than previously recognized. In this review, we highlight the ways in which bacterial pathogens have evolved to subvert caspase-3 both through effector proteins that directly interact with the enzyme or by modulating pathways that influence its activation and activity.
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Affiliation(s)
- Daniel M Wall
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G12 8QQ, UK
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15
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Gustafson JE, Muthaiyan A, Dupre JM, Ricke SC. WITHDRAWN: Staphylococcus aureus and understanding the factors that impact enterotoxin production in foods: A review. Food Control 2014. [DOI: 10.1016/j.foodcont.2014.10.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Staphylococcus aureus induces apoptosis of human monocytic U937 cells via NF-κB signaling pathways. Microb Pathog 2010; 49:252-9. [DOI: 10.1016/j.micpath.2010.06.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2010] [Revised: 06/07/2010] [Accepted: 06/16/2010] [Indexed: 01/31/2023]
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17
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Lin CF, Chen CL, Huang WC, Cheng YL, Hsieh CY, Wang CY, Hong MY. Different types of cell death induced by enterotoxins. Toxins (Basel) 2010; 2:2158-76. [PMID: 22069678 PMCID: PMC3153280 DOI: 10.3390/toxins2082158] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Accepted: 08/03/2010] [Indexed: 02/07/2023] Open
Abstract
The infection of bacterial organisms generally causes cell death to facilitate microbial invasion and immune escape, both of which are involved in the pathogenesis of infectious diseases. In addition to the intercellular infectious processes, pathogen-produced/secreted enterotoxins (mostly exotoxins) are the major weapons that kill host cells and cause diseases by inducing different types of cell death, particularly apoptosis and necrosis. Blocking these enterotoxins with synthetic drugs and vaccines is important for treating patients with infectious diseases. Studies of enterotoxin-induced apoptotic and necrotic mechanisms have helped us to create efficient strategies to use against these well-characterized cytopathic toxins. In this article, we review the induction of the different types of cell death from various bacterial enterotoxins, such as staphylococcal enterotoxin B, staphylococcal alpha-toxin, Panton-Valentine leukocidin, alpha-hemolysin of Escherichia coli, Shiga toxins, cytotoxic necrotizing factor 1, heat-labile enterotoxins, and the cholera toxin, Vibrio cholerae. In addition, necrosis caused by pore-forming toxins, apoptotic signaling through cross-talk pathways involving mitochondrial damage, endoplasmic reticulum stress, and lysosomal injury is discussed.
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Affiliation(s)
- Chiou-Feng Lin
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (W.-C.H.); (Y.-L.C.); (C.-Y.H.); (C.-Y.W.); (M.-Y.H.)
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (C.-L.C.)
- Author to whom correspondence should be addressed; ; Tel.: +886-06-235-3535 ext. 4240; Fax: +886-06-275-8781
| | - Chia-Ling Chen
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (C.-L.C.)
| | - Wei-Ching Huang
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (W.-C.H.); (Y.-L.C.); (C.-Y.H.); (C.-Y.W.); (M.-Y.H.)
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan
| | - Yi-Lin Cheng
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (W.-C.H.); (Y.-L.C.); (C.-Y.H.); (C.-Y.W.); (M.-Y.H.)
- Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan
| | - Chia-Yuan Hsieh
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (W.-C.H.); (Y.-L.C.); (C.-Y.H.); (C.-Y.W.); (M.-Y.H.)
| | - Chi-Yun Wang
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (W.-C.H.); (Y.-L.C.); (C.-Y.H.); (C.-Y.W.); (M.-Y.H.)
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan
| | - Ming-Yuan Hong
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan; (W.-C.H.); (Y.-L.C.); (C.-Y.H.); (C.-Y.W.); (M.-Y.H.)
- Department of Emergency, National Cheng Kung University Hospital, Tainan 701, Taiwan
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