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Pineda GE, Rearte B, Todero MF, Bruballa AC, Bernal AM, Fernandez-Brando RJ, Isturiz MA, Zotta E, Alba-Soto CD, Palermo MS, Ramos MV. Absence of interleukin-10 reduces progression of shiga toxin-induced hemolytic uremic syndrome. Clin Sci (Lond) 2021; 135:575-588. [PMID: 33496327 DOI: 10.1042/cs20200468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 01/15/2021] [Accepted: 01/26/2021] [Indexed: 11/17/2022]
Abstract
Hemolytic Uremic Syndrome (HUS), a disease triggered by Shiga toxin (Stx), is characterized by hemolytic anemia, thrombocytopenia and renal failure. The inflammatory response mediated by polymorphonuclear neutrophils (PMNs) and monocytes is essential to HUS onset. Still, the role of anti-inflammatory cytokines is less clear. The deficiency of IL-10, an anti-inflammatory cytokine, leads to severe pathology in bacterial infections but also to beneficial effects in models of sterile injury. The aim of this work was to analyze the role of IL-10 during HUS. Control and IL-10 lacking mice (IL-10-/-) were intravenously injected with Stx type 2 (Stx2) and survival rate was evaluated. PMN and circulating and renal pro- and anti-inflammatory factors were analyzed by FACS and enzyme-linked immunosorbent assay (ELISA) respectively. IL-10-/- mice showed a higher survival associated with lower renal damage reflected by reduced plasma urea and creatinine levels than control mice. Circulating PMN increased at 72 h in both mouse strains accompanied by an up-regulation of CD11b in control mice. In parallel, renal PMN were significantly increased only in control mice after toxin. Plasma TNF-α, IL-6 and corticosterone levels were higher increased in IL-10-/- than control mice. Simultaneously renal TNF-α raised constantly but was accompanied by increased TGF-β levels in IL-10-/- mice. These results demonstrate that the profile of circulating and renal cytokines after Stx2 differed between strains suggesting that balance of these factors could participate in renal protection. We conclude that IL-10 absence has a protective role in an experimental model of HUS by reducing PMN recruitment into kidney and renal damage, and increasing mice survival.
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Affiliation(s)
- Gonzalo Ezequiel Pineda
- Laboratorio de Patogénesis e Inmunología de los Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Bárbara Rearte
- Laboratorio de Fisiología de los Procesos Inflamatorios, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - María Florencia Todero
- Laboratorio de Fisiología de los Procesos Inflamatorios, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Andrea Cecilia Bruballa
- Laboratorio de Patogénesis e Inmunología de los Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Alan Mauro Bernal
- Laboratorio de Patogénesis e Inmunología de los Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Romina Jimena Fernandez-Brando
- Laboratorio de Patogénesis e Inmunología de los Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Martin Amadeo Isturiz
- Laboratorio de Fisiología de los Procesos Inflamatorios, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Elsa Zotta
- Laboratorio de Fisiopatogenia, Departamento de Ciencias Fisiológicas, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Catalina Dirney Alba-Soto
- Instituto de Microbiología y Parasitología Médica (IMPaM, CONICET-UBA), Departamento de Microbiología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Marina Sandra Palermo
- Laboratorio de Patogénesis e Inmunología de los Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - María Victoria Ramos
- Laboratorio de Patogénesis e Inmunología de los Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)-Academia Nacional de Medicina, Buenos Aires, Argentina
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Vind AC, Genzor AV, Bekker-Jensen S. Ribosomal stress-surveillance: three pathways is a magic number. Nucleic Acids Res 2020; 48:10648-10661. [PMID: 32941609 PMCID: PMC7641731 DOI: 10.1093/nar/gkaa757] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 08/28/2020] [Accepted: 09/06/2020] [Indexed: 12/15/2022] Open
Abstract
Cells rely on stress response pathways to uphold cellular homeostasis and limit the negative effects of harmful environmental stimuli. The stress- and mitogen-activated protein (MAP) kinases, p38 and JNK, are at the nexus of numerous stress responses, among these the ribotoxic stress response (RSR). Ribosomal impairment is detrimental to cell function as it disrupts protein synthesis, increase inflammatory signaling and, if unresolved, lead to cell death. In this review, we offer a general overview of the three main translation surveillance pathways; the RSR, Ribosome-associated Quality Control (RQC) and the Integrated Stress Response (ISR). We highlight recent advances made in defining activation mechanisms for these pathways and discuss their commonalities and differences. Finally, we reflect on the physiological role of the RSR and consider the therapeutic potential of targeting the sensing kinase ZAKα for treatment of ribotoxin exposure.
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Affiliation(s)
- Anna Constance Vind
- Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
| | - Aitana Victoria Genzor
- Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
| | - Simon Bekker-Jensen
- Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
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Lee MS, Tesh VL. Roles of Shiga Toxins in Immunopathology. Toxins (Basel) 2019; 11:E212. [PMID: 30970547 PMCID: PMC6521259 DOI: 10.3390/toxins11040212] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 04/04/2019] [Accepted: 04/05/2019] [Indexed: 12/20/2022] Open
Abstract
Shigella species and Shiga toxin-producing Escherichia coli (STEC) are agents of bloody diarrhea that may progress to potentially lethal complications such as diarrhea-associated hemolytic uremic syndrome (D+HUS) and neurological disorders. The bacteria share the ability to produce virulence factors called Shiga toxins (Stxs). Research over the past two decades has identified Stxs as multifunctional toxins capable of inducing cell stress responses in addition to their canonical ribotoxic function inhibiting protein synthesis. Notably, Stxs are not only potent inducers of cell death, but also activate innate immune responses that may lead to inflammation, and these effects may increase the severity of organ injury in patients infected with Stx-producing bacteria. In the intestines, kidneys, and central nervous system, excessive or uncontrolled host innate and cellular immune responses triggered by Stxs may result in sensitization of cells to toxin mediated damage, leading to immunopathology and increased morbidity and mortality in animal models (including primates) and human patients. Here, we review studies describing Stx-induced innate immune responses that may be associated with tissue damage, inflammation, and complement activation. We speculate on how these processes may contribute to immunopathological responses to the toxins.
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Affiliation(s)
- Moo-Seung Lee
- Environmental Diseases Research Center, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Daejeon 34141, Korea.
- Department of Biomolecular Science, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 127 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea.
| | - Vernon L Tesh
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX 77807, USA.
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Niu S, Paluszynski J, Bian Z, Shi L, Kidder K, Liu Y. LPS-primed CD11b + leukocytes serve as an effective carrier of Shiga toxin 2 to cause hemolytic uremic syndrome in mice. Sci Rep 2018; 8:3994. [PMID: 29507316 PMCID: PMC5838166 DOI: 10.1038/s41598-018-22327-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 02/21/2018] [Indexed: 12/05/2022] Open
Abstract
Shiga toxin (Stx)-induced hemolytic uremic syndrome (HUS) is a life-threatening complication associated with Stx-producing Escherichia coli infection. One critical barrier of understanding HUS is how Stx transports from infected intestine to kidney to cause HUS. Passive dissemination seems unlikely, while circulating blood cells have been debated to serve as the toxin carrier. Employing a murine model of Stx2-induced HUS with LPS priming (LPS-Stx2), we investigate how Stx causes HUS and identify possible toxin carrier. We show that peripheral white blood cells (WBC), but not other blood cells or cell-free plasma, carry Stx2 in LPS-Stx2-treated mice. The capability of WBC binding to Stx2 is confirmed in brief ex vivo Stx2 incubation, and adoptively transferring these Stx2-bound WBC into mice induces HUS. Cell separation further identifies a subpopulation in the CD11b+ myeloid leukocytes not the CD11b− lymphocytes group act as the toxin carrier, which captures Stx2 upon exposure and delivers the toxin in vivo. Interestingly, LPS-induced inflammation significantly augments these leukocytes for binding to Stx2 and enhances HUS toxicity. Our results demonstrate that a specific fraction of circulating leukocytes carry Stx2 and cause HUS in vivo, and that LPS priming enhances the carrier capacity and aggravates organ damage.
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Affiliation(s)
- Shuo Niu
- Program of Immunology & Molecular Cellular Biology, Department of Biology, Center for Diagnostics & Therapeutics, Center of Inflammation, Immunity and Infection, Georgia State University, Atlanta, GA, 30302, USA
| | - John Paluszynski
- Program of Immunology & Molecular Cellular Biology, Department of Biology, Center for Diagnostics & Therapeutics, Center of Inflammation, Immunity and Infection, Georgia State University, Atlanta, GA, 30302, USA
| | - Zhen Bian
- Program of Immunology & Molecular Cellular Biology, Department of Biology, Center for Diagnostics & Therapeutics, Center of Inflammation, Immunity and Infection, Georgia State University, Atlanta, GA, 30302, USA
| | - Lei Shi
- Program of Immunology & Molecular Cellular Biology, Department of Biology, Center for Diagnostics & Therapeutics, Center of Inflammation, Immunity and Infection, Georgia State University, Atlanta, GA, 30302, USA
| | - Koby Kidder
- Program of Immunology & Molecular Cellular Biology, Department of Biology, Center for Diagnostics & Therapeutics, Center of Inflammation, Immunity and Infection, Georgia State University, Atlanta, GA, 30302, USA
| | - Yuan Liu
- Program of Immunology & Molecular Cellular Biology, Department of Biology, Center for Diagnostics & Therapeutics, Center of Inflammation, Immunity and Infection, Georgia State University, Atlanta, GA, 30302, USA.
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Zhang BF, Wang PF, Cong YX, Lei JL, Wang H, Huang H, Han S, Zhuang Y. Anti-high mobility group box-1 (HMGB1) antibody attenuates kidney damage following experimental crush injury and the possible role of the tumor necrosis factor-α and c-Jun N-terminal kinase pathway. J Orthop Surg Res 2017; 12:110. [PMID: 28701229 PMCID: PMC5508710 DOI: 10.1186/s13018-017-0614-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 07/04/2017] [Indexed: 12/18/2022] Open
Abstract
Background Inflammation plays a crucial role in kidney damage after crush syndrome (CS). Several researchers report that high mobility group box-1 protein (HMGB1) may be the vital trigger in kidney damage, and tumor necrosis factor-α (TNF-α) and c-Jun N-terminal kinase (JNK) are involve in this pathophysiological process, but their biological roles are unclear. This study aimed to explore the relationship between HMGB1, JNK, and TNF-α in kidney damage. Methods The crush injury model was established using weight compression. The reliability of the crush injury model was determined by hematoxylin-eosin (HE) staining. Western blot was used to detect the expression of HMGB1, JNK, and TNF-α, and TUNEL was used to mark apoptotic cells in the renal cortex. Results The results showed that the highest expression of HMGB1 in muscle was 12 h after CS. JNK and TNF-α increased and peaked at 1 day after CS in kidneys. Western blot analysis revealed that anti-HMGB1 antibody could downregulate the expression of JNK and TNF-α. Anti-TNF-α could downregulate activation of JNK, and SP600125 could downregulate expression of TNF-α in the kidneys. In addition, anti-HMGB1 antibody, anti-TNF-α antibody, and SP600125 could reduce cellular apoptosis in the renal cortex. Conclusions It is possible that JNK and TNF-α commonly contribute to kidney damage by assembling a positive feedback cycle after CS, leading to increased apoptosis in the renal cortex. HMGB1 from the muscle may be the trigger.
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Affiliation(s)
- Bin-Fei Zhang
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China
| | - Peng-Fei Wang
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China
| | - Yu-Xuan Cong
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China
| | - Jin-Lai Lei
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China
| | - Hu Wang
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China
| | - Hai Huang
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China
| | - Shuang Han
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China
| | - Yan Zhuang
- Department of Orthopedic trauma, Honghui Hospital, College of Medicine, Xi'an Jiaotong University, Beilin District, No. 555 Youyi East Road, 710054, Xi'an, Shaanxi Province, People's Republic of China.
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Sharma D, Bhattacharya P, Kalia K, Tiwari V. Diabetic nephropathy: New insights into established therapeutic paradigms and novel molecular targets. Diabetes Res Clin Pract 2017; 128:91-108. [PMID: 28453961 DOI: 10.1016/j.diabres.2017.04.010] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 04/07/2017] [Indexed: 02/06/2023]
Abstract
Diabetic nephropathy is one of the most prevalent microvascular complication in patients suffering from diabetes and is reported to be the major cause of renal failure when compared to any other kidney disease. Currently, available therapies provide only symptomatic relief and unable to treat the underlying pathophysiology of diabetic nephropathy. This review will explore new insights into the established therapeutic paradigms targeting oxidative stress, inflammation and endoplasmic reticulum stress with the focus on recent clinical developments. Apart from this, the involvement of novel cellular and molecular mechanisms including the role of endothelin-receptor antagonists, Wnt signaling pathway, epigenetics and micro RNA is also discussed so that key molecular switches involved in the pathogenesis of diabetic nephropathy can be identified. Elucidating new molecular pathways will help in the development of novel therapeutics for the prevention and treatment of diabetic nephropathy.
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Affiliation(s)
- Dilip Sharma
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Ahmedabad, Gandhinagar 382355, Gujarat, India
| | - Pallab Bhattacharya
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Ahmedabad, Gandhinagar 382355, Gujarat, India
| | - Kiran Kalia
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Ahmedabad, Gandhinagar 382355, Gujarat, India.
| | - Vinod Tiwari
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Ahmedabad, Gandhinagar 382355, Gujarat, India.
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Sant B, Rao PVL, Nagar DP, Pant SC, Bhasker ASB. Evaluation of abrin induced nephrotoxicity by using novel renal injury markers. Toxicon 2017; 131:20-28. [PMID: 28288935 DOI: 10.1016/j.toxicon.2017.03.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 03/08/2017] [Accepted: 03/09/2017] [Indexed: 12/22/2022]
Abstract
Abrin is a potent plant toxin analogous to ricin that is derived from the seeds of Abrus precatorius plant. It belongs to the family of type II ribosome-inactivating proteins and causes cell death by irreversibly inactivating ribosomes through site-specific depurination. In this study we examined the in vivo nephrotoxicity potential of abrin toxin in terms of oxidative stress, inflammation, histopathological changes and biomarkers of kidney injury. Animals were exposed to 0.5 and 1.0 LD50 dose of abrin by intraperitoneal route and observed for 1, 3, and 7 day post-toxin exposure. Depletion of reduced glutathione and increased lipid peroxidation levels were observed in abrin treated mice. In addition, abrin also induced inflammation in the kidneys as observed through expression of MMP-9 and MMP-9/NGAL complex in abrin treated groups by using zymography method. Nephrotoxicity was also evaluated by western blot analysis of kidney injury biomarkers including Clusterin, Cystatin C and NGAL, and their results indicate severity of kidney injury in abrin treated groups. Kidney histology confirmed inflammatory changes due to abrin. The data generated in the present study clearly prove the nephrotoxicity potential of abrin.
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Affiliation(s)
- Bhavana Sant
- Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road, Gwalior 474002, India
| | - P V Lakshmana Rao
- Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road, Gwalior 474002, India
| | - D P Nagar
- Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road, Gwalior 474002, India
| | - S C Pant
- Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road, Gwalior 474002, India
| | - A S B Bhasker
- Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road, Gwalior 474002, India.
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8
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Shiga Toxins as Multi-Functional Proteins: Induction of Host Cellular Stress Responses, Role in Pathogenesis and Therapeutic Applications. Toxins (Basel) 2016; 8:toxins8030077. [PMID: 26999205 PMCID: PMC4810222 DOI: 10.3390/toxins8030077] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 02/25/2016] [Accepted: 02/29/2016] [Indexed: 12/17/2022] Open
Abstract
Shiga toxins (Stxs) produced by Shiga toxin-producing bacteria Shigella dysenteriae serotype 1 and select serotypes of Escherichia coli are primary virulence factors in the pathogenesis of hemorrhagic colitis progressing to potentially fatal systemic complications, such as hemolytic uremic syndrome and central nervous system abnormalities. Current therapeutic options to treat patients infected with toxin-producing bacteria are limited. The structures of Stxs, toxin-receptor binding, intracellular transport and the mode of action of the toxins have been well defined. However, in the last decade, numerous studies have demonstrated that in addition to being potent protein synthesis inhibitors, Stxs are also multifunctional proteins capable of activating multiple cell stress signaling pathways, which may result in apoptosis, autophagy or activation of the innate immune response. Here, we briefly present the current understanding of Stx-activated signaling pathways and provide a concise review of therapeutic applications to target tumors by engineering the toxins.
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9
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Abstract
Enterohemorrhagic Escherichia coli (EHEC) is a highly pathogenic bacterial strain capable of causing watery or bloody diarrhea, the latter termed hemorrhagic colitis, and hemolytic-uremic syndrome (HUS). HUS is defined as the simultaneous development of non-immune hemolytic anemia, thrombocytopenia, and acute renal failure. The mechanism by which EHEC bacteria colonize and cause severe colitis, followed by renal failure with activated blood cells, as well as neurological symptoms, involves the interaction of bacterial virulence factors and specific pathogen-associated molecular patterns with host cells as well as the host response. The innate immune host response comprises the release of antimicrobial peptides as well as cytokines and chemokines in addition to activation and/or injury to leukocytes, platelets, and erythrocytes and activation of the complement system. Some of the bacterial interactions with the host may be protective in nature, but, when excessive, contribute to extensive tissue injury, inflammation, and thrombosis, effects that may worsen the clinical outcome of EHEC infection. This article describes aspects of the host response occurring during EHEC infection and their effects on specific organs.
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10
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Biomarkers of Gastrointestinal Host Responses to Microbial Infections. Mol Microbiol 2016. [DOI: 10.1128/9781555819071.ch46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Chronic nandrolone administration promotes oxidative stress, induction of pro-inflammatory cytokine and TNF-α mediated apoptosis in the kidneys of CD1 treated mice. Toxicol Appl Pharmacol 2014; 280:97-106. [PMID: 25065671 DOI: 10.1016/j.taap.2014.06.031] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 06/14/2014] [Accepted: 06/15/2014] [Indexed: 12/26/2022]
Abstract
Nandrolone decanoate administration and strenuous exercise increase the extent of renal damage in response to renal toxic injury. We studied the role played by oxidative stress in the apoptotic response caused by nandrolone decanoate in the kidneys of strength-trained male CD1 mice. To measure cytosolic enzyme activity, glutathione peroxidase (GPx), glutathione reductase (GR) and malondialdehyde (MDA) were determined after nandrolone treatment. An immunohistochemical study and Western blot analysis were performed to evaluate cell apoptosis and to measure the effects of renal expression of inflammatory mediators (IL-1β, TNF-α) on the induction of apoptosis (HSP90, TUNEL). Dose-related oxidative damage in the kidneys of treated mice is shown by an increase in MDA levels and by a reduction of antioxidant enzyme GR and GPx activities, resulting in the kidney's reduced radical scavenging ability. Renal specimens of the treated group showed relevant glomeruli alterations and increased immunostaining and protein expressions, which manifested significant focal segmental glomerulosclerosis. The induction of proinflammatory cytokine expression levels was confirmed by Western blot analysis. Long-term administration of nandrolone promotes oxidative injury in the mouse kidneys. TNF-α mediated injury due to nandrolone in renal cells appears to play a role in the activation of both the intrinsic and extrinsic apoptosis pathways.
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12
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Lee MS, Kim MH, Tesh VL. Shiga toxins expressed by human pathogenic bacteria induce immune responses in host cells. J Microbiol 2013; 51:724-30. [PMID: 24385347 DOI: 10.1007/s12275-013-3429-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 10/22/2013] [Indexed: 12/22/2022]
Abstract
Shiga toxins are a family of genetically and structurally related toxins that are the primary virulence factors produced by the bacterial pathogens Shigella dysenteriae serotype 1 and certain Escherichia coli strains. The toxins are multifunctional proteins inducing protein biosynthesis inhibition, ribotoxic and ER stress responses, apoptosis, autophagy, and inflammatory cytokine and chemokine production. The regulated induction of inflammatory responses is key to minimizing damage upon injury or pathogen-mediated infections, requiring the concerted activation of multiple signaling pathways to control cytokine/chemokine expression. Activation of host cell signaling cascades is essential for Shiga toxin-mediated proinflammatory responses and the contribution of the toxins to virulence. Many studies have been reported defining the inflammatory response to Shiga toxins in vivo and in vitro, including production and secretion of tumor necrosis factor alpha (TNF-α), interleukin-1β (IL-1β), macrophage inflammatory protein-1α/β (MIP-1α/β), macrophage chemoattractant monocyte chemoattractant protein 1 (MCP-1), interleukin 8 (IL-8), interleukin 6 (IL-6), and Groβ. These cytokines and chemokines may contribute to damage in the colon and development of life threatening conditions such as acute renal failure (hemolytic uremic syndrome) and neurological abnormalities. In this review, we summarize recent findings in Shiga toxin-mediated inflammatory responses by different types of cells in vitro and in animal models. Signaling pathways involved in the inflammatory responses are briefly reviewed.
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Affiliation(s)
- Moo-Seung Lee
- Infection and Immunity Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Republic of Korea,
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Stearns-Kurosawa DJ, Oh SY, Cherla RP, Lee MS, Tesh VL, Papin J, Henderson J, Kurosawa S. Distinct renal pathology and a chemotactic phenotype after enterohemorrhagic Escherichia coli shiga toxins in non-human primate models of hemolytic uremic syndrome. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 182:1227-38. [PMID: 23402998 PMCID: PMC3620421 DOI: 10.1016/j.ajpath.2012.12.026] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 12/13/2012] [Accepted: 12/24/2012] [Indexed: 12/31/2022]
Abstract
Enterohemorrhagic Escherichia coli cause approximately 1.5 million infections globally with 176,000 cases occurring in the United States annually from ingesting contaminated food, most frequently E. coli O157:H7 in ground beef or fresh produce. In severe cases, the painful prodromal hemorrhagic colitis is complicated by potentially lethal hemolytic uremic syndrome (HUS), particularly in children. Bacterial Shiga-like toxins (Stx1, Stx2) are primarily responsible for HUS and the kidney and neurologic damage that ensue. Small animal models are hampered by the inability to reproduce HUS with thrombotic microangiopathy, hemolytic anemia, and acute kidney injury. Earlier, we showed that nonhuman primates (Papio) recapitulated clinical HUS after Stx challenge and that novel therapeutic intervention rescued the animals. Here, we present detailed light and electron microscopic pathology examination of the kidneys from these Stx studies. Stx1 challenge resulted in more severe glomerular endothelial injury, whereas the glomerular injury after Stx2 also included prominent mesangiolysis and an eosinophilic inflammatory infiltration. Both toxins induced glomerular platelet-rich thrombi, interstitial hemorrhage, and tubular injury. Analysis of kidney and other organs for inflammation biomarkers showed a striking chemotactic profile, with extremely high mRNA levels for IL-8, monocyte chemoattractant protein 1, and macrophage inflammatory protein 1α and elevated urine chemokines at 48 hours after challenge. These observations give unique insight into the pathologic consequences of each toxin in a near human setting and present potential pathways for therapeutic intervention.
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Affiliation(s)
- Deborah J. Stearns-Kurosawa
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Sun-Young Oh
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Rama P. Cherla
- Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, Bryan, Texas
| | - Moo-Seung Lee
- Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, Bryan, Texas
| | - Vernon L. Tesh
- Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, Bryan, Texas
| | - James Papin
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Joel Henderson
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Shinichiro Kurosawa
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts
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Moon Y. Cellular alterations of mucosal integrity by ribotoxins: Mechanistic implications of environmentally-linked epithelial inflammatory diseases. Toxicon 2012; 59:192-204. [DOI: 10.1016/j.toxicon.2011.11.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 10/20/2011] [Accepted: 11/10/2011] [Indexed: 01/01/2023]
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Lipopolysaccharide renders transgenic mice expressing human serum amyloid P component sensitive to Shiga toxin 2. PLoS One 2011; 6:e21457. [PMID: 21731756 PMCID: PMC3123346 DOI: 10.1371/journal.pone.0021457] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Accepted: 06/02/2011] [Indexed: 12/26/2022] Open
Abstract
Transgenic C57BL/6 mice expressing human serum amyloid P component (HuSAP) are resistant to Shiga toxin 2 (Stx2) at dosages that are lethal in HuSAP-negative wild-type mice. However, it is well established that Stx2 initiates extra-intestinal complications such as the haemolytic-uremic syndrome despite the presence of HuSAP in human sera. We now demonstrate that co-administering purified Escherichia coli O55 lipopolysaccharide (LPS), at a dosage of 300 ng/g body weight, to HuSAP-transgenic mice increases their susceptibility to the lethal effects of Stx2. The enhanced susceptibility to Stx2 correlated with an increased expression of genes encoding the pro-inflammatory cytokine TNFα and chemokines of the CXC and CC families in the kidneys of LPS-treated mice, 48 hours after the Stx2/LPS challenge. Co-administering the glucocorticoid dexamethasone, but not the LPS neutralizing cationic peptide LL-37, protected LPS-sensitized HuSAP-transgenic mice from lethal doses of Stx2. Dexamethasone protection was specifically associated with decreased expression of the same inflammatory mediators (CXC and CC-type chemokines and TNFα) linked to enhanced susceptibility caused by LPS. The studies reveal further details about the complex cascade of host-related events that are initiated by Stx2 as well as establish a new animal model system in which to investigate strategies for diminishing serious Stx2-mediated complications in humans infected with enterohemorrhagic E. coli strains.
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Abstract
Purified Shiga toxin (Stx) alone is capable of producing systemic complications, including hemolytic-uremic syndrome (HUS), in animal models of disease. Stx includes two major antigenic forms (Stx1 and Stx2), with minor variants of Stx2 (Stx2a to -h). Stx2a is more potent than Stx1. Epidemiologic studies suggest that Stx2 subtypes also differ in potency, but these differences have not been well documented for purified toxin. The relative potencies of five purified Stx2 subtypes, Stx2a, Stx2b, Stx2c, Stx2d, and activated (elastase-cleaved) Stx2d, were studied in vitro by examining protein synthesis inhibition using Vero monkey kidney cells and inhibition of metabolic activity (reduction of resazurin to fluorescent resorufin) using primary human renal proximal tubule epithelial cells (RPTECs). In both RPTECs and Vero cells, Stx2a, Stx2d, and elastase-cleaved Stx2d were at least 25 times more potent than Stx2b and Stx2c. In vivo potency in mice was also assessed. Stx2b and Stx2c had potencies similar to that of Stx1, while Stx2a, Stx2d, and elastase-cleaved Stx2d were 40 to 400 times more potent than Stx1.
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