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Lang H, Zhang H, Ma M, Wan X, Chen Y, Sun Q, Cao C. Serum Fstl1, a novel biomarker screened based on protein array technology, predict acute kidney injury and major renal adverse events after cardiac surgery: A prospective cohort study. Clin Chim Acta 2023; 539:79-86. [PMID: 36372309 DOI: 10.1016/j.cca.2022.11.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/30/2022] [Accepted: 11/07/2022] [Indexed: 11/13/2022]
Abstract
BACKGROUND Acute kidney injury (AKI) is a severe complication after cardiac surgery. The early prediction of AKI can facilitate timely intervention and prevent adverse outcomes. We aimed to identify unique serum biomarker that can be used to facilitate early prediction of AKI after cardiac surgery. METHODS A prospective cohort study was performed in cardiac surgery patients, serum samples were collected from 172 patients before surgery, 4 h and 1 day after surgery. We used protein array technology to detect the serum protein expression profile of cardiac surgery-associated AKI (CSA-AKI) patients, and verified the novel biomarker follistatin-like 1 (Fstl1) by expanding the sample size. The primary outcome was AKI, under the definition of Kidney Disease: Improving Global Outcomes (KDIGO). RESULTS Patients with AKI had significantly higher serum Fstl1 levels at 4 h after surgery. After multivariate adjustment, the highest quartile of postoperative serum Fstl1 level, compared with the lowest quartile, associated with 56.3-fold higher odds of AKI. Serum Fstl1 at 4 h post-surgery had a high predictive ability for AKI, severe AKI and major renal adverse events(MAKE) (AUC = 0.713, 0.869 and 0.808, respectively). Adding postoperative 4 h serum Fstl1 to the clinical model can significantly improve the predictive performance of the model. CONCLUSIONS Higher serum Fstl1 levels at 4 h post-surgery is associated with higher odds of AKI after cardiac surgery, and when added to clinical model and Cleveland Score, serum Fstl1 levels at 4 h after cardiac surgery enhanced early prediction of AKI, severe AKI and MAKE in patients undergoing cardiac surgery.
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Affiliation(s)
- Hong Lang
- Department of Nephrology, Sir Run Run Hospital, Nanjing Medical University, 109 Longmian Road, Nanjing, Jiangsu 211166, China
| | - Hang Zhang
- Department of Thoracic Surgery, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No. 650 Xinsongjiang Road, Shanghai 201620, China
| | - Mengqing Ma
- Department of Nephrology, Sir Run Run Hospital, Nanjing Medical University, 109 Longmian Road, Nanjing, Jiangsu 211166, China
| | - Xin Wan
- Department of Nephrology, Nanjing First Hospital, Nanjing Medical University, 68 Changle Road, Nanjing, Jiangsu 210006, China
| | - Yuyang Chen
- Department of Nephrology, Sir Run Run Hospital, Nanjing Medical University, 109 Longmian Road, Nanjing, Jiangsu 211166, China
| | - Qing Sun
- Department of Nephrology, Sir Run Run Hospital, Nanjing Medical University, 109 Longmian Road, Nanjing, Jiangsu 211166, China
| | - Changchun Cao
- Department of Nephrology, Sir Run Run Hospital, Nanjing Medical University, 109 Longmian Road, Nanjing, Jiangsu 211166, China.
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Vallés PG, Gil Lorenzo AF, Garcia RD, Cacciamani V, Benardon ME, Costantino VV. Toll-like Receptor 4 in Acute Kidney Injury. Int J Mol Sci 2023; 24:ijms24021415. [PMID: 36674930 PMCID: PMC9864062 DOI: 10.3390/ijms24021415] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/06/2022] [Accepted: 12/13/2022] [Indexed: 01/13/2023] Open
Abstract
Acute kidney injury (AKI) is a common and devastating pathologic condition, associated with considerable high morbidity and mortality. Although significant breakthroughs have been made in recent years, to this day no effective pharmacological therapies for its treatment exist. AKI is known to be connected with intrarenal and systemic inflammation. The innate immune system plays an important role as the first defense response mechanism to tissue injury. Toll-like receptor 4 (TLR4) is a well-characterized pattern recognition receptor, and increasing evidence has shown that TLR4 mediated inflammatory response, plays a pivotal role in the pathogenesis of acute kidney injury. Pathogen-associated molecular patterns (PAMPS), which are the conserved microbial motifs, are sensed by these receptors. Endogenous molecules generated during tissue injury, and labeled as damage-associated molecular pattern molecules (DAMPs), also activate pattern recognition receptors, thereby offering an understanding of sterile types of inflammation. Excessive, uncontrolled and/or sustained activation of TLR4, may lead to a chronic inflammatory state. In this review we describe the role of TLR4, its endogenous ligands and activation in the inflammatory response to ischemic/reperfusion-induced AKI and sepsis-associated AKI. The potential regeneration signaling patterns of TLR4 in acute kidney injury, are also discussed.
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Affiliation(s)
- Patricia G. Vallés
- Área de Fisiopatología, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Centro Universitario, Mendoza 5500, Argentina
- IMBECU-CONICET (Instituto de Medicina y Biología Experimental de Cuyo—Consejo Nacional de Investigaciones Científicas y Técnicas), Mendoza 5500, Argentina
- Correspondence:
| | - Andrea Fernanda Gil Lorenzo
- Área de Fisiopatología, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Centro Universitario, Mendoza 5500, Argentina
| | - Rodrigo D. Garcia
- Área de Fisiopatología, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Centro Universitario, Mendoza 5500, Argentina
| | - Valeria Cacciamani
- IMBECU-CONICET (Instituto de Medicina y Biología Experimental de Cuyo—Consejo Nacional de Investigaciones Científicas y Técnicas), Mendoza 5500, Argentina
| | - María Eugenia Benardon
- Área de Fisiopatología, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Centro Universitario, Mendoza 5500, Argentina
| | - Valeria Victoria Costantino
- IMBECU-CONICET (Instituto de Medicina y Biología Experimental de Cuyo—Consejo Nacional de Investigaciones Científicas y Técnicas), Mendoza 5500, Argentina
- Área de Biología Celular, Departamento de Morfofisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Centro Universitario, Mendoza 5500, Argentina
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3
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Vázquez-Carballo C, Guerrero-Hue M, García-Caballero C, Rayego-Mateos S, Opazo-Ríos L, Morgado-Pascual JL, Herencia-Bellido C, Vallejo-Mudarra M, Cortegano I, Gaspar ML, de Andrés B, Egido J, Moreno JA. Toll-Like Receptors in Acute Kidney Injury. Int J Mol Sci 2021; 22:ijms22020816. [PMID: 33467524 PMCID: PMC7830297 DOI: 10.3390/ijms22020816] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/09/2021] [Accepted: 01/11/2021] [Indexed: 12/16/2022] Open
Abstract
Acute kidney injury (AKI) is an important health problem, affecting 13.3 million individuals/year. It is associated with increased mortality, mainly in low- and middle-income countries, where renal replacement therapy is limited. Moreover, survivors show adverse long-term outcomes, including increased risk of developing recurrent AKI bouts, cardiovascular events, and chronic kidney disease. However, there are no specific treatments to decrease the adverse consequences of AKI. Epidemiological and preclinical studies show the pathological role of inflammation in AKI, not only at the acute phase but also in the progression to chronic kidney disease. Toll-like receptors (TLRs) are key regulators of the inflammatory response and have been associated to many cellular processes activated during AKI. For that reason, a number of anti-inflammatory agents targeting TLRs have been analyzed in preclinical studies to decrease renal damage during AKI. In this review, we updated recent knowledge about the role of TLRs, mainly TLR4, in the initiation and development of AKI as well as novel compounds targeting these molecules to diminish kidney injury associated to this pathological condition.
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Affiliation(s)
- Cristina Vázquez-Carballo
- Renal, Vascular and Diabetes Research Laboratory, IIS-Fundación Jiménez Díaz, Universidad Autónoma de Madrid, 28040 Madrid, Spain; (C.V.-C.); (S.R.-M.); (L.O.-R.); (C.H.-B.)
| | - Melania Guerrero-Hue
- Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Hospital Universitario Reina Sofía, 14004 Córdoba, Spain; (M.G.-H.); (C.G.-C.); (J.L.M.-P.); (M.V.-M.)
| | - Cristina García-Caballero
- Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Hospital Universitario Reina Sofía, 14004 Córdoba, Spain; (M.G.-H.); (C.G.-C.); (J.L.M.-P.); (M.V.-M.)
| | - Sandra Rayego-Mateos
- Renal, Vascular and Diabetes Research Laboratory, IIS-Fundación Jiménez Díaz, Universidad Autónoma de Madrid, 28040 Madrid, Spain; (C.V.-C.); (S.R.-M.); (L.O.-R.); (C.H.-B.)
| | - Lucas Opazo-Ríos
- Renal, Vascular and Diabetes Research Laboratory, IIS-Fundación Jiménez Díaz, Universidad Autónoma de Madrid, 28040 Madrid, Spain; (C.V.-C.); (S.R.-M.); (L.O.-R.); (C.H.-B.)
- Spanish Biomedical Research Centre in Diabetes and Associated Metabolic Disorders (CIBERDEM), 28040 Madrid, Spain
| | - José Luis Morgado-Pascual
- Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Hospital Universitario Reina Sofía, 14004 Córdoba, Spain; (M.G.-H.); (C.G.-C.); (J.L.M.-P.); (M.V.-M.)
| | - Carmen Herencia-Bellido
- Renal, Vascular and Diabetes Research Laboratory, IIS-Fundación Jiménez Díaz, Universidad Autónoma de Madrid, 28040 Madrid, Spain; (C.V.-C.); (S.R.-M.); (L.O.-R.); (C.H.-B.)
| | - Mercedes Vallejo-Mudarra
- Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Hospital Universitario Reina Sofía, 14004 Córdoba, Spain; (M.G.-H.); (C.G.-C.); (J.L.M.-P.); (M.V.-M.)
| | - Isabel Cortegano
- Immunobiology Department, Carlos III Health Institute, 28220 Majadahonda (Madrid), Spain; (I.C.); (M.L.G.); (B.d.A.)
| | - María Luisa Gaspar
- Immunobiology Department, Carlos III Health Institute, 28220 Majadahonda (Madrid), Spain; (I.C.); (M.L.G.); (B.d.A.)
| | - Belén de Andrés
- Immunobiology Department, Carlos III Health Institute, 28220 Majadahonda (Madrid), Spain; (I.C.); (M.L.G.); (B.d.A.)
| | - Jesús Egido
- Renal, Vascular and Diabetes Research Laboratory, IIS-Fundación Jiménez Díaz, Universidad Autónoma de Madrid, 28040 Madrid, Spain; (C.V.-C.); (S.R.-M.); (L.O.-R.); (C.H.-B.)
- Spanish Biomedical Research Centre in Diabetes and Associated Metabolic Disorders (CIBERDEM), 28040 Madrid, Spain
- Correspondence: (J.E.); (J.A.M.); Tel.: +34-915504800 (J.E.); +34-957-218039 (J.A.M.)
| | - Juan Antonio Moreno
- Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Hospital Universitario Reina Sofía, 14004 Córdoba, Spain; (M.G.-H.); (C.G.-C.); (J.L.M.-P.); (M.V.-M.)
- Biomedical Research Networking Center on Cardiovascular Diseases (CIBERCV), 28029 Madrid, Spain
- Department of Cell Biology, Physiology and Immunology, University of Cordoba, 140471 Cordoba, Spain
- Correspondence: (J.E.); (J.A.M.); Tel.: +34-915504800 (J.E.); +34-957-218039 (J.A.M.)
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Ren Q, Cheng L, Yi J, Ma L, Pan J, Gou SJ, Fu P. Toll-like Receptors as Potential Therapeutic Targets in Kidney Diseases. Curr Med Chem 2020; 27:5829-5854. [PMID: 31161985 DOI: 10.2174/0929867325666190603110907] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 03/15/2019] [Accepted: 05/13/2019] [Indexed: 02/08/2023]
Abstract
Toll-like Receptors (TLRs) are members of pattern recognition receptors and serve a pivotal role in host immunity. TLRs response to pathogen-associated molecular patterns encoded by pathogens or damage-associated molecular patterns released by dying cells, initiating an inflammatory cascade, where both beneficial and detrimental effects can be exerted. Accumulated evidence has revealed that TLRs are closely associated with various kidney diseases but their roles are still not well understood. This review updated evidence on the roles of TLRs in the pathogenesis of kidney diseases including urinary tract infection, glomerulonephritis, acute kidney injury, transplant allograft dysfunction and chronic kidney diseases.
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Affiliation(s)
- Qian Ren
- Kidney Research Laboratory, Division of Nephrology, National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Lu Cheng
- Kidney Research Laboratory, Division of Nephrology, National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Jing Yi
- Kidney Research Laboratory, Division of Nephrology, National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Liang Ma
- Kidney Research Laboratory, Division of Nephrology, National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Jing Pan
- Kidney Research Laboratory, Division of Nephrology, National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Shen-Ju Gou
- Kidney Research Laboratory, Division of Nephrology, National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Ping Fu
- Kidney Research Laboratory, Division of Nephrology, National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu 610041, China
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5
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Zhou J, Bai Y, Jiang Y, Tarun P, Feng Y, Huang R, Fu P. Immunomodulatory role of recombinant human erythropoietin in acute kidney injury induced by crush syndrome via inhibition of the TLR4/NF-κB signaling pathway in macrophages. Immunopharmacol Immunotoxicol 2020; 42:37-47. [PMID: 31971040 DOI: 10.1080/08923973.2019.1706555] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Objective: The present study aimed to investigate whether recombinant human erythropoietin (rHuEPO) plays an immunomodulatory function by regulating the TLR4/NF-κB signaling pathway.Materials and methods: C57BL/6 mice were intraperitoneally injected with rHuEPO and, half an hour later, with 50% glycerol at the dose of 7.5 ml/kg to induce crush syndrome (CS)-acute kidney injury (AKI). The levels of TNF-α, IL-1β, IL-6, serum creatinine (Scr), and creatine kinase (CK) were measured. The kidney tissues were analyzed by HE staining, and macrophage infiltration was detected by immunohistochemistry. Double immunofluorescence staining, RT-qPCR, and western blotting were conducted to analyze TLR4/NF-κB p65 expression. Ferrous myoglobin was co-cultured with RAW264.7 cells to mimic crush injury and the production of proinflammatory cytokines. The expression levels of TLR4 and NF-κB p65 were measured.Results: In vivo study results revealed that rHuEPO ameliorated renal function, tissue damage, production of proinflammatory cytokines, and macrophage infiltration in the kidneys. The protein and mRNA expression levels of genes involved in the TLR4/NF-κB signaling pathway in CS-induced AKI mice were upregulated (p < .05). Meanwhile, the expression levels of TLR4, NF-κB p65, and proinflammatory cytokines in RAW264.7 cells were downregulated in CS-AKI mice injected with rHuEPO (p < .05).Conclusions: Our results demonstrated the immunomodulatory capacity of rHuEPO and confirmed that rHuEPO exerts protective effects against CS-induced AKI by regulating the TLR4/NF-κB signaling pathway in macrophages. Therefore, our findings highlight the therapeutic potential of rHuEPO in improving the prognosis of CS-AKI patients.
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Affiliation(s)
- Jiaojiao Zhou
- Division of Ultrasound, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Yajun Bai
- Department of Nephrology, Nanchong Central Hospital, Nanchong, Sichuan, China
| | - Yong Jiang
- Sichuan Center for Disease Control and Prevention, Chengdu, Sichuan, China
| | - Padamata Tarun
- West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Yuying Feng
- Kidney Research Institute, Department of Internal Medicine, Division of Nephrology, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Rongshuang Huang
- Kidney Research Institute, Department of Internal Medicine, Division of Nephrology, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Ping Fu
- Kidney Research Institute, Department of Internal Medicine, Division of Nephrology, West China Hospital of Sichuan University, Chengdu, Sichuan, China
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6
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Tariket S, Hamzeh-Cognasse H, Arthaud CA, Laradi S, Bourlet T, Berthelot P, Garraud O, Cognasse F. Inhibition of the CD40/CD40L complex protects mice against ALI-induced pancreas degradation. Transfusion 2019; 59:1090-1101. [DOI: 10.1111/trf.15206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 11/18/2018] [Accepted: 11/19/2018] [Indexed: 02/06/2023]
Affiliation(s)
- Sofiane Tariket
- Université de Lyon; GIMAP-EA3064; Saint-Etienne France
- Établissement Français du Sang Auvergne-Rhône-Alpes; Saint-Etienne France
| | | | | | - Sandrine Laradi
- Université de Lyon; GIMAP-EA3064; Saint-Etienne France
- Établissement Français du Sang Auvergne-Rhône-Alpes; Saint-Etienne France
| | | | | | - Olivier Garraud
- Université de Lyon; GIMAP-EA3064; Saint-Etienne France
- Institut National de Transfusion Sanguine (INTS); Paris France
| | - Fabrice Cognasse
- Université de Lyon; GIMAP-EA3064; Saint-Etienne France
- Établissement Français du Sang Auvergne-Rhône-Alpes; Saint-Etienne France
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7
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Yang B, Lan S, Dieudé M, Sabo-Vatasescu JP, Karakeussian-Rimbaud A, Turgeon J, Qi S, Gunaratnam L, Patey N, Hébert MJ. Caspase-3 Is a Pivotal Regulator of Microvascular Rarefaction and Renal Fibrosis after Ischemia-Reperfusion Injury. J Am Soc Nephrol 2018; 29:1900-1916. [PMID: 29925521 DOI: 10.1681/asn.2017050581] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 05/11/2018] [Indexed: 12/31/2022] Open
Abstract
Background Ischemia-reperfusion injury (IRI) is a major risk factor for chronic renal failure. Here, we characterize the different modes of programmed cell death in the tubular and microvascular compartments during the various stages of IRI-induced AKI, and their relative importance to renal fibrogenesis.Methods We performed unilateral renal artery clamping for 30 minutes and contralateral nephrectomy in wild-type mice (C57BL/6) or caspase-3-/- mice.Results Compared with their wild-type counterparts, caspase-3-/- mice in the early stage of AKI had high urine cystatin C levels, tubular injury scores, and serum creatinine levels. Electron microscopy revealed evidence of tubular epithelial cell necrosis in caspase-3-/- mice, and immunohistochemistry showed upregulation of the necroptosis marker receptor-interacting serine/threonine-protein kinase 3 (RIPK3) in renal cortical sections. Western blot analysis further demonstrated enhanced levels of phosphorylated RIPK3 in the kidneys of caspase-3-/- mice. In contrast, caspase-3-/- mice had less microvascular congestion and activation in the early and extension phases of AKI. In the long term (3 weeks after IRI), caspase-3-/- mice had reduced microvascular rarefaction and renal fibrosis, as well as decreased expression of α-smooth muscle actin and reduced collagen deposition within peritubular capillaries. Moreover, caspase-3-/- mice exhibited signs of reduced tubular ischemia, including lower tubular expression of hypoxia-inducible factor-1α and improved tubular injury scores.Conclusions These results establish the pivotal importance of caspase-3 in regulating microvascular endothelial cell apoptosis and renal fibrosis after IRI. These findings also demonstrate the predominant role of microvascular over tubular injury as a driver of progressive renal damage and fibrosis after IRI.
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Affiliation(s)
- Bing Yang
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.,Canadian National Transplant Research Program, Edmonton, Alberta, Canada.,Université de Montréal, Montreal, Quebec, Canada
| | - Shanshan Lan
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.,Canadian National Transplant Research Program, Edmonton, Alberta, Canada.,Université de Montréal, Montreal, Quebec, Canada
| | - Mélanie Dieudé
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.,Canadian National Transplant Research Program, Edmonton, Alberta, Canada.,Université de Montréal, Montreal, Quebec, Canada
| | | | - Annie Karakeussian-Rimbaud
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.,Canadian National Transplant Research Program, Edmonton, Alberta, Canada
| | - Julie Turgeon
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.,Canadian National Transplant Research Program, Edmonton, Alberta, Canada
| | - Shijie Qi
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.,Canadian National Transplant Research Program, Edmonton, Alberta, Canada
| | - Lakshman Gunaratnam
- Canadian National Transplant Research Program, Edmonton, Alberta, Canada.,London Health Sciences Centre, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada; and
| | - Natalie Patey
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada; .,Canadian National Transplant Research Program, Edmonton, Alberta, Canada.,Université de Montréal, Montreal, Quebec, Canada.,Department of Pathology, Centre hospitalier universitaire Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada
| | - Marie-Josée Hébert
- Research Centre, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada; .,Canadian National Transplant Research Program, Edmonton, Alberta, Canada.,Université de Montréal, Montreal, Quebec, Canada
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8
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Van Beusecum JP, Zhang S, Cook AK, Inscho EW. Acute toll-like receptor 4 activation impairs rat renal microvascular autoregulatory behaviour. Acta Physiol (Oxf) 2017; 221:204-220. [PMID: 28544543 DOI: 10.1111/apha.12899] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/16/2016] [Accepted: 05/18/2017] [Indexed: 12/24/2022]
Abstract
AIM Little is known about how toll-like receptor 4 (TLR4) influences the renal microvasculature. We hypothesized that acute TLR4 stimulation with lipopolysaccharide (LPS) impairs afferent arteriole autoregulatory behaviour, partially through reactive oxygen species (ROS). METHODS We assessed afferent arteriole autoregulatory behaviour after LPS treatment (1 mg kg-1 ; i.p.) using the in vitro blood-perfused juxtamedullary nephron preparation. Autoregulatory behaviour was assessed by measuring diameter responses to stepwise changes in renal perfusion pressure. TLR4 expression was assessed by immunofluorescence, immunohistochemistry and Western blot analysis in the renal cortex and vasculature. RESULTS Baseline arteriole diameter at 100 mmHg averaged 15.2 ± 1.2 μm and 12.2 ± 1.0 μm for control and LPS groups (P < 0.05) respectively. When perfusion pressure was increased in 15 mmHg increments from 65 to 170 mmHg, arteriole diameter in control kidneys decreased significantly to 69 ± 6% of baseline diameter. In the LPS-treated group, arteriole diameter remained essentially unchanged (103 ± 9% of baseline), indicating impaired autoregulatory behaviour. Pre-treatment with anti-TLR4 antibody or the TLR4 antagonist, LPS-RS, preserved autoregulatory behaviour during LPS treatment. P2 receptor reactivity was normal in control and LPS-treated rats. Pre-treatment with Losartan (angiotensin type 1 receptor blocker; (AT1 ) 2 mg kg-1 ; i.p.) increased baseline afferent arteriole diameter but did not preserve autoregulatory behaviour in LPS-treated rats. Acute exposure to Tempol (10-3 mol L-1 ), a superoxide dismutase mimetic, restored pressure-mediated vasoconstriction in kidneys from LPS-treated rats. CONCLUSION These data demonstrate that TLR4 activation impairs afferent arteriole autoregulatory behaviour, partially through ROS, but independently of P2 and AT1 receptor activation.
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Affiliation(s)
- J. P. Van Beusecum
- Division of Nephrology; Department of Medicine; University of Alabama at Birmingham; Birmingham AL USA
- Department of Physiology; Augusta University; Augusta GA USA
| | - S. Zhang
- Division of Nephrology; Department of Medicine; University of Alabama at Birmingham; Birmingham AL USA
- Department of Physiology; Augusta University; Augusta GA USA
| | - A. K. Cook
- Division of Nephrology; Department of Medicine; University of Alabama at Birmingham; Birmingham AL USA
- Department of Physiology; Augusta University; Augusta GA USA
| | - E. W. Inscho
- Division of Nephrology; Department of Medicine; University of Alabama at Birmingham; Birmingham AL USA
- Department of Physiology; Augusta University; Augusta GA USA
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9
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Dube S, Matam T, Yen J, Mang HE, Dagher PC, Hato T, Sutton TA. Endothelial STAT3 Modulates Protective Mechanisms in a Mouse Ischemia-Reperfusion Model of Acute Kidney Injury. J Immunol Res 2017; 2017:4609502. [PMID: 29181415 PMCID: PMC5664346 DOI: 10.1155/2017/4609502] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 08/29/2017] [Indexed: 01/24/2023] Open
Abstract
STAT3 is a transcriptional regulator that plays an important role in coordinating inflammation and immunity. In addition, there is a growing appreciation of the role STAT3 signaling plays in response to organ injury following diverse insults. Acute kidney injury (AKI) from ischemia-reperfusion injury is a common clinical entity with devastating consequences, and the recognition that endothelial alterations contribute to kidney dysfunction in this setting is of growing interest. Consequently, we used a mouse with a genetic deletion of Stat3 restricted to the endothelium to examine the role of STAT3 signaling in the pathophysiology of ischemic AKI. In a mouse model of ischemic AKI, the loss of endothelial STAT3 signaling significantly exacerbated kidney dysfunction, morphologic injury, and proximal tubular oxidative stress. The increased severity of ischemic AKI was associated with more robust endothelial-leukocyte adhesion and increased tissue accumulation of F4/80+ macrophages. Moreover, important proximal tubular adaptive mechanisms to injury were diminished in association with decreased tissue mRNA levels of the epithelial cell survival cytokine IL-22. In aggregate, these findings suggest that the endothelial STAT3 signaling plays an important role in limiting kidney dysfunction in ischemic AKI and that selective pharmacologic activation of endothelial STAT3 signaling could serve as a potential therapeutic target.
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Affiliation(s)
- Shataakshi Dube
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Tejasvi Matam
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jessica Yen
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Henry E. Mang
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Pierre C. Dagher
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Takashi Hato
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Timothy A. Sutton
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
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Surgical preparation of rats and mice for intravital microscopic imaging of abdominal organs. Methods 2017; 128:129-138. [PMID: 28698070 DOI: 10.1016/j.ymeth.2017.07.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/12/2017] [Accepted: 07/04/2017] [Indexed: 01/20/2023] Open
Abstract
Intravital microscopy is a powerful research tool that can provide insight into cellular and subcellular events that take place in organs in the body. However, meaningful results can only be obtained from animals whose physiology is preserved during the process of microscopy. Here I discuss the importance of preserving the overall state of health of the animal, methods of anesthesia, surgical techniques for intravital microscopy of various abdominal organs, methods to maintain and monitor the physiology of the animal during microscopy and associated peri- and post-operative recovery considerations.
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Advances in Chronic Kidney Disease. Int J Mol Sci 2016; 17:ijms17081314. [PMID: 27529223 PMCID: PMC5000711 DOI: 10.3390/ijms17081314] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 08/05/2016] [Accepted: 08/08/2016] [Indexed: 01/13/2023] Open
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