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HIF-1α induction during reperfusion avoids maladaptive repair after renal ischemia/reperfusion involving miR127-3p. Sci Rep 2017; 7:41099. [PMID: 28106131 PMCID: PMC5247697 DOI: 10.1038/srep41099] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 12/15/2016] [Indexed: 12/11/2022] Open
Abstract
Ischemia/reperfusion (I/R) leads to Acute Kidney Injury. HIF-1α is a key factor during organ response to I/R. We previously demonstrated that HIF-1α is induced during renal reperfusion, after ischemia. Here we investigate the role of HIF-1α and the HIF-1α dependent mechanisms in renal repair after ischemia. By interference of HIF-1α in a rat model of renal I/R, we observed loss of expression and mis-localization of e-cadherin and induction of α-SMA, MMP-13, TGFβ, and collagen I. Moreover, we demonstrate that HIF-1α inhibition promotes renal cell infiltrates by inducing IL-1β, TNF-α, MCP-1 and VCAM-1, through NFkB activity. In addition, HIF-1α inhibition induced proximal tubule cells proliferation but it did not induce compensatory apoptosis, both in vivo. In vitro, HIF-1α knockdown in HK2 cells subjected to hypoxia/reoxygenation (H/R) promote cell entry into S phase, correlating with in vivo data. HIF-1α interference leads to downregulation of miR-127-3p and induction of its target gene Bcl6 in vivo. Moreover, modulation of miR-127-3p in HK2 cells subjected to H/R results in EMT regulation: miR127-3p inhibition promote loss of e-cadherin and induction of α-SMA and collagen I. In conclusion, HIF-1α induction during reperfusion is a protector mechanism implicated in a normal renal tissue repair after I/R.
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Abstract
The clinical category of acute kidney injury includes a wide range of completely different disorders, many with their own pathomechanisms and treatment targets. In this review we focus on the role of inflammation in the pathogenesis of acute tubular necrosis (ATN). We approach this topic by first discussing the role of the immune system in the different phases of ATN (ie, early and late injury phase, recovery phase, and the long-term outcome phase of an ATN episode). A more detailed discussion focuses on putative therapeutic targets among the following mechanisms and mediators: oxidative stress and reactive oxygen species-related necroinflammation, regulated cell death-related necroinflammation, immunoregulatory lipid mediators, cytokines and cytokine signaling, chemokines and chemokine signaling, neutrophils and neutrophils extracellular traps (NETs) associated neutrophil cell death, called NETosis, extracellular histones, proinflammatory mononuclear phagocytes, humoral mediators such as complement, pentraxins, and natural antibodies. Any prioritization of these targets has to take into account the intrinsic differences between rodent models and human ATN, the current acute kidney injury definitions, and the timing of clinical decision making. Several conceptual problems need to be solved before anti-inflammatory drugs that are efficacious in rodent ATN may become useful therapeutics for human ATN.
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Affiliation(s)
- Shrikant R Mulay
- Nephrologisches Zentrum, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany
| | - Alexander Holderied
- Nephrologisches Zentrum, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany
| | - Santhosh V Kumar
- Nephrologisches Zentrum, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany
| | - Hans-Joachim Anders
- Nephrologisches Zentrum, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany.
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203
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Guiteras R, Flaquer M, Cruzado JM. Macrophage in chronic kidney disease. Clin Kidney J 2016; 9:765-771. [PMID: 27994852 PMCID: PMC5162417 DOI: 10.1093/ckj/sfw096] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 08/22/2016] [Indexed: 12/13/2022] Open
Abstract
Chronic kidney disease (CKD) has become a major health problem worldwide. This review describes the role of macrophages in CKD and highlights the importance of anti-inflammatory M2 macrophage activation in both renal fibrosis and wound healing processes. Furthermore, the mechanisms by which M2 macrophages induce renal repair and regeneration are still under debate and currently demand more attention. The M1/M2 macrophage balance is related to the renal microenvironment and could influence CKD progression. In fact, an inflammatory renal environment and M2 plasticity can be the major hurdles to establishing macrophage cell-based therapies in CKD. M2 macrophage cell-based therapy is promising if the M2 phenotype remains stable and is 'fixed' by in vitro manipulation. However, a greater understanding of phenotype polarization is still required. Moreover, better strategies and targets to induce reparative macrophages in vivo should guide future investigations in order to abate kidney diseases.
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Affiliation(s)
- Roser Guiteras
- Experimental Nephrology, Departament de Ciències Clíniques, Universitat de Barcelona, Institut d'Investigació biomèdica de Bellvitge (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
| | - Maria Flaquer
- Experimental Nephrology, Departament de Ciències Clíniques, Universitat de Barcelona, Institut d'Investigació biomèdica de Bellvitge (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
| | - Josep M. Cruzado
- Experimental Nephrology, Departament de Ciències Clíniques, Universitat de Barcelona, Institut d'Investigació biomèdica de Bellvitge (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
- Nephrology Department, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain
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204
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Inflammatory macrophages can transdifferentiate into myofibroblasts during renal fibrosis. Cell Death Dis 2016; 7:e2495. [PMID: 27906172 PMCID: PMC5261004 DOI: 10.1038/cddis.2016.402] [Citation(s) in RCA: 206] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 11/01/2016] [Accepted: 11/02/2016] [Indexed: 01/06/2023]
Abstract
Myofibroblasts play a central role in renal fibrosis although the origin of these cells remains controversial. We recently reported that bone marrow-derived macrophages can give rise to myofibroblasts through macrophage to myofibroblast transition (MMT). However, several important issues remain to be addressed, including whether MMT occurs in human kidney disease and verification of the MMT process through lineage tracing. Biopsies from a cohort of 58 patients with various forms of kidney disease were examined for MMT cells that co-express macrophage (CD68) and myofibroblast (α-smooth muscle actin, α-SMA) markers. MMT cells were evident in active fibrotic lesions, but were largely absent in acute inflammatory or sclerotic lesions, suggesting that MMT cells contribute to progressive renal fibrosis. Fate-mapping studies in LysMCreTomato mice identified substantial numbers of Tomato+ myeloid cells with F4/80+ macrophage phenotype expressing α-SMA and collagen I in the unilateral ureteral obstructive model of renal fibrosis, providing direct evidence for the MMT process during the development of renal fibrosis. In addition, MMT cells had a predominant M2 phenotype in both human and mouse renal fibrosis. Finally, selective depletion of myeloid cells via diphtheria toxin in LysMCreiDTR mice largely abolished macrophage infiltration and MMT cells in the obstructed kidney and substantially reduced accumulation of α-SMA+ myofibroblasts and collagen deposition, revealing a pathogenic role for inflammatory macrophages in MMT and tissue fibrosis. In conclusion, these findings provide substantial new data to support the postulate that macrophages can directly transdifferentiate into collagen-producing myofibroblasts in human and experimental kidney disease.
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205
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Transfusion of CD206 + M2 Macrophages Ameliorates Antibody-Mediated Glomerulonephritis in Mice. THE AMERICAN JOURNAL OF PATHOLOGY 2016; 186:3176-3188. [PMID: 27855848 DOI: 10.1016/j.ajpath.2016.08.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/26/2016] [Accepted: 08/09/2016] [Indexed: 01/04/2023]
Abstract
Macrophages are multifunctional immune cells that may either drive or modulate disease pathogenesis, depending on the activated phenotype. In this study, we investigated the protective effects of CD206+ M2 macrophages against nephrotoxic serum nephritis in mice. We found that these immunosuppressive macrophages, derived from bone marrow and stimulated with IL-4/IL-13 [CD206+ M2 bone marrow-derived macrophages (M2BMMs)], protected against renal injury, decreased proteinuria, and diminished the infiltration of CD68+ macrophages, neutrophils, and T cells into glomerular tissue. Comparable therapeutic results were obtained with CD206+ M2 cells derived from induced pluripotent stem cells. Notably, CD206+ M2BMMs, which retained an M2 signature, could elicit a switch of M1 to M2 phenotype in co-cultured macrophages. Moreover, these cells were found to induce the production of regulatory T cells in the spleen and renal draining lymph node. Accordingly, mRNA expression of the T helper 1 cytokines tumor necrosis factor-α, interferon-β, interferon-γ, and IL-12 was significantly reduced in kidneys from mice treated with CD206+ M2BMMs. Taken together, the data suggest that CD206+ M2 may have therapeutic potential against antibody-mediated glomerular injury and presents its therapeutic value for the treatment of crescentic nephritis in humans.
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206
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Abstract
Adipose tissue not only functions as the major energy-storing tissue, but also functions as an endocrine organ that regulates systemic metabolism by releasing various hormones called adipokines. Macrophages play a critical role in maintaining adipocyte health in a lean state and in remodeling during the progression of obesity. Large numbers of classically activated (M1) macrophages accumulate in adipose tissue as adipocytes become larger because of excessive energy conditions, and they adversely affect insulin resistance by triggering local and systemic inflammation. In contrast, alternatively activated (M2) macrophages seem to maintain the health of adipose tissues in a lean state. In addition, they play a role in adapting to excess energy states, because M2 macrophage dysfunction caused by genetic disruption of the M2 gene results in metabolic disorders under high-fat-fed conditions that are probably attributable to their anti-inflammatory functions. Nonetheless, how M2 macrophages contribute to maintaining the health of adipose tissue and therefore to insulin sensitivity is largely unknown. In this article, we review the literature on the role of M1 and M2 macrophages in metabolism, with a special focus on the role of M2 macrophages in adipose tissue. Likewise, we raise topics of M2 macrophages in non-adipose tissues to expand our understanding of macrophage heterogeneity.
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207
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Yang D, Jia W, Zhu YZ. Leonurine, a Potential Agent of Traditional Chinese Medicine: Recent Updates and Future Perspectives. Nat Prod Commun 2016. [DOI: 10.1177/1934578x1601101130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Herba Leonuri, also named Chinese Motherwort, has been extensively investigated as an effective agent on the uterus system. Our group has been studying the natural products of Herba Leonuri for several years, and during this period, many biological activities of the drug were recognized. Leonurine (4-guanidino- N-butyl-syringate) is an alkaloid present in Herba Leonuri. Recently, growing evidence has highlighted the therapeutic potential of leonurine in multiple diseases, especially cardiovascular. In this review, we discuss the biological activities of leonurine, as well as recent advances involving this alkaloid.
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Affiliation(s)
- Di Yang
- Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China, 201203
| | - Wanwan Jia
- Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China, 201203
| | - Yi Zhun Zhu
- Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China, 201203
- School of Pharmacy, Macau University of Science and Technology, Macau
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208
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Lovisa S, Zeisberg M, Kalluri R. Partial Epithelial-to-Mesenchymal Transition and Other New Mechanisms of Kidney Fibrosis. Trends Endocrinol Metab 2016; 27:681-695. [PMID: 27372267 DOI: 10.1016/j.tem.2016.06.004] [Citation(s) in RCA: 176] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 06/06/2016] [Accepted: 06/06/2016] [Indexed: 12/24/2022]
Abstract
Kidney fibrosis is the unavoidable consequence of chronic kidney disease irrespective of the primary underlying insult. It is a complex phenomenon governed by the interplay between different cellular components and intricate networks of signaling pathways, which together lead to loss of renal functionality and replacement of kidney parenchyma with scar tissue. An immense effort has recently been made to understand the molecular and cellular mechanisms leading to kidney fibrosis. The cellular protagonists of this process include myofibroblasts, tubular epithelial cells, endothelial cells, and immune cells. We discuss here the most recent findings, including partial epithelial-to-mesenchymal transition (EMT), in the initiation and progression of tissue fibrosis and chronic kidney disease (CKD). A deep understanding of these mechanisms will allow the development of effective therapies.
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Affiliation(s)
- Sara Lovisa
- Department of Cancer Biology, Metastasis Research Center, University of Texas M.D. Anderson Cancer Center, Houston, TX 77054, USA
| | - Michael Zeisberg
- Department of Nephrology and Rheumatology, Göttingen University Medical Center, Georg August University, Göttingen, Germany
| | - Raghu Kalluri
- Department of Cancer Biology, Metastasis Research Center, University of Texas M.D. Anderson Cancer Center, Houston, TX 77054, USA; Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA; Department of Bioengineering, Rice University, Houston, TX 77030, USA.
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209
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Weber GJ, Pushpakumar S, Tyagi SC, Sen U. Homocysteine and hydrogen sulfide in epigenetic, metabolic and microbiota related renovascular hypertension. Pharmacol Res 2016; 113:300-312. [PMID: 27602985 DOI: 10.1016/j.phrs.2016.09.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 08/31/2016] [Accepted: 09/02/2016] [Indexed: 12/18/2022]
Abstract
Over the past several years, hydrogen sulfide (H2S) has been shown to be an important player in a variety of physiological functions, including neuromodulation, vasodilation, oxidant regulation, inflammation, and angiogenesis. H2S is synthesized primarily through metabolic processes from the amino acid cysteine and homocysteine in various organ systems including neuronal, cardiovascular, gastrointestinal, and kidney. Derangement of cysteine and homocysteine metabolism and clearance, particularly in the renal vasculature, leads to H2S biosynthesis deregulation causing or contributing to existing high blood pressure. While a variety of environmental influences, such as diet can have an effect on H2S regulation and function, genetic factors, and more recently epigenetics, also have a vital role in H2S regulation and function, and therefore disease initiation and progression. In addition, new research into the role of gut microbiota in the development of hypertension has highlighted the need to further explore these microorganisms and how they influence the levels of H2S throughout the body and possibly exploiting microbiota for use of hypertension treatment. In this review, we summarize recent advances in the field of hypertension research emphasizing renal contribution and how H2S physiology can be exploited as a possible therapeutic strategy to ameliorate kidney dysfunction as well as to control blood pressure.
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Affiliation(s)
- Gregory J Weber
- Department of Physiology, University of Louisville, School of Medicine, Louisville, KY 40202, United States
| | - Sathnur Pushpakumar
- Department of Physiology, University of Louisville, School of Medicine, Louisville, KY 40202, United States
| | - Suresh C Tyagi
- Department of Physiology, University of Louisville, School of Medicine, Louisville, KY 40202, United States
| | - Utpal Sen
- Department of Physiology, University of Louisville, School of Medicine, Louisville, KY 40202, United States.
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210
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Baldwin WM, Morelli AE. Strategically Altering the Balance of Macrophage Subpopulations to Inhibit Chronic Rejection. Am J Transplant 2016; 16:2510-1. [PMID: 27136758 PMCID: PMC6479223 DOI: 10.1111/ajt.13849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 04/28/2016] [Indexed: 01/25/2023]
Affiliation(s)
- W. M. Baldwin
- Department of Immunology, Cleveland Clinic, Cleveland, OH 44195,Corresponding Author: William M Baldwin III,
| | - Adrian E. Morelli
- T.E. Starzl Institute and Department of Surgery. University of Pittsburgh, Pittsburgh, PA 15213
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211
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Berthier CC, Kretzler M, Davidson A. A systems approach to renal inflammation in SLE. Clin Immunol 2016; 185:109-118. [PMID: 27534926 DOI: 10.1016/j.clim.2016.08.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 08/11/2016] [Accepted: 08/12/2016] [Indexed: 12/17/2022]
Abstract
Lupus disease and its complications including lupus nephritis (LN) are very disabling and significantly impact the quality of life and longevity of patients. Broadly immunosuppressive treatments do not always provide the expected clinical benefits and have significant side effects that contribute to patient morbidity. In the era of systems biology, new strategies are being deployed integrating diverse sources of information (molecular and clinical) so as to identify individual disease specificities and select less aggressive treatments. In this review, we summarize integrative approaches linking molecular disease profiles (mainly tissue transcriptomics) and clinical phenotypes. The main goals are to better understand the pathogenesis of lupus nephritis, to identify the risk factors for renal flare and to find the predictors of both short and long-term clinical outcome. Identification of common key drivers and additional patient-specific key drivers can open the door to improved and individualized therapy to prevent and treat LN.
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Affiliation(s)
- Celine C Berthier
- Internal Medicine, Department of Nephrology, University of Michigan, Ann Arbor, MI, USA
| | - Matthias Kretzler
- Internal Medicine, Department of Nephrology, University of Michigan, Ann Arbor, MI, USA
| | - Anne Davidson
- Feinstein Institute, Center for Autoimmunity and Musculoskeletal Diseases, Manhasset, NY, USA 11030.
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212
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Peda JD, Salah SM, Wallace DP, Fields PE, Grantham CJ, Fields TA, Swenson-Fields KI. Autocrine IL-10 activation of the STAT3 pathway is required for pathological macrophage differentiation in polycystic kidney disease. Dis Model Mech 2016; 9:1051-61. [PMID: 27491076 PMCID: PMC5047688 DOI: 10.1242/dmm.024745] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 07/14/2016] [Indexed: 12/16/2022] Open
Abstract
Polycystic kidney disease (PKD) is characterized by slow expansion of fluid-filled cysts derived from tubules within the kidney. Cystic expansion results in injury to surrounding parenchyma and leads to inflammation, scarring and ultimately loss of renal function. Macrophages are a key element in this process, promoting cyst epithelial cell proliferation, cyst expansion and disease progression. Previously, we have shown that the microenvironment established by cystic epithelial cells can ‘program’ macrophages, inducing M2-like macrophage polarization that is characterized by expression of markers that include Arg1 and Il10. Here, we functionally characterize these macrophages, demonstrating that their differentiation enhances their ability to promote cyst cell proliferation. This observation indicates a model of reciprocal pathological interactions between cysts and the innate immune system: cyst epithelial cells promote macrophage polarization to a phenotype that, in turn, is especially efficient in promoting cyst cell proliferation and cyst growth. To better understand the genesis of this macrophage phenotype, we examined the role of IL-10, a regulatory cytokine shown to be important for macrophage-stimulated tissue repair in other settings. Herein, we show that the acquisition of the pathological macrophage phenotype requires IL-10 secretion by the macrophages. Further, we demonstrate a requirement for IL-10-dependent autocrine activation of the STAT3 pathway. These data suggest that the IL-10 pathway in macrophages plays an essential role in the pathological relationship between cysts and the innate immune system in PKD, and thus could be a potential therapeutic target. Summary: Macrophages in polycystic kidney disease are induced by cyst epithelial cell factors to perform pathological pro-proliferative functions through stimulation of an autocrine IL-10–STAT3 pathway.
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Affiliation(s)
- Jacqueline D Peda
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160, USA Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Sally M Salah
- Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Darren P Wallace
- Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160, USA Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Patrick E Fields
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160, USA Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Connor J Grantham
- Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Timothy A Fields
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160, USA Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Katherine I Swenson-Fields
- Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
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213
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Braga TT, Correa-Costa M, Azevedo H, Silva RC, Cruz MC, Almeida MES, Hiyane MI, Moreira-Filho CA, Santos MF, Perez KR, Cuccovia IM, Camara NOS. Early infiltration of p40IL12(+)CCR7(+)CD11b(+) cells is critical for fibrosis development. IMMUNITY INFLAMMATION AND DISEASE 2016; 4:300-14. [PMID: 27621813 PMCID: PMC5004285 DOI: 10.1002/iid3.114] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 06/22/2016] [Accepted: 06/23/2016] [Indexed: 12/27/2022]
Abstract
INTRODUCTION Macrophages are heterogeneous and thus can be correlated with distinct tissue outcomes after injury. Conflicting data have indicated that the M2-related phenotype directly triggers fibrosis. Conversely, we hypothesize here that the inflammatory milieu provided by early infiltration of pro-inflammatory macrophages dictates tissue scarring after injury. METHODS AND RESULTS We first determined that tissue-localized macrophages exhibit a pro-inflammatory phenotype (p40IL12(+)CCR7(+)CD11b(+)) during the early phase of a chronic injury model, in contrast to a pro-resolving phenotype (Arg1(+)IL10(+)CD206(+)CD11b(+)) at a later stage. Then, we evaluated the effects of injecting macrophages differentiated in vitro in the presence of IFNγ + LPS or IL4 + IL13 or non-differentiated macrophages (hereafter, M0) on promoting inflammation and progression of chronic injury in macrophage-depleted mice. In addition to enhancing the expression of pro-inflammatory cytokines, the injection of M (IFNγ + LPS), but not M (IL4 + IL13) or M0, accentuated fibrosis while augmenting levels of anti-inflammatory molecules, increasing collagen deposition and impairing organ function. We observed a similar profile after injection of sorted CCR7(+)CD11b(+) cells and a more pronounced effect of M (IFNγ + LPS) cells originated from Stat6(-/-) mice. The injection of M (IFNγ + LPS) cells was associated with the up-regulation of inflammation- and fibrosis-related proteins (Thbs1, Mmp7, Mmp8, and Mmp13). CONCLUSIONS Our results suggest that pro-inflammatory macrophages promote microenvironmental changes that may lead to fibrogenesis by inducing an inflammatory milieu that alters a network of extracellular-related genes, culminating in tissue fibrosis.
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Affiliation(s)
- Tarcio Teodoro Braga
- Laboratory of Transplantation Immunobiology, Department of Immunology Institute of Biomedical Sciences IV, University of São Paulo (USP) São Paulo Brazil
| | - Matheus Correa-Costa
- Laboratory of Transplantation Immunobiology, Department of Immunology Institute of Biomedical Sciences IV, University of São Paulo (USP) São Paulo Brazil
| | - Hatylas Azevedo
- Department of Pediatrics Faculdade de Medicina da Universidade de São Paulo (FMUSP) São Paulo Brazil
| | - Reinaldo Correia Silva
- Laboratory of Transplantation Immunobiology, Department of Immunology Institute of Biomedical Sciences IV, University of São Paulo (USP) São Paulo Brazil
| | - Mario Costa Cruz
- Laboratory of Transplantation Immunobiology, Department of Immunology Institute of Biomedical Sciences IV, University of São Paulo (USP) São Paulo Brazil
| | | | - Meire Ioshie Hiyane
- Laboratory of Transplantation Immunobiology, Department of Immunology Institute of Biomedical Sciences IV, University of São Paulo (USP) São Paulo Brazil
| | | | - Marinilce Fagundes Santos
- Department of Cellular Biology-Institute of Biomedical Sciences University of São Paulo (USP) São Paulo Brazil
| | - Katia Regina Perez
- Department of Biochemistry-Institute of Chemistry University of São Paulo (USP) São Paulo Brazil
| | - Iolanda Midea Cuccovia
- Department of Biochemistry-Institute of Chemistry University of São Paulo (USP) São Paulo Brazil
| | - Niels Olsen Saraiva Camara
- Laboratory of Transplantation Immunobiology, Department of ImmunologyInstitute of Biomedical Sciences IV, University of São Paulo (USP)São PauloBrazil; Laboratory of Clinical and Experimental Immunology, Division of NephrologyFederal University of São Paulo (UNIFESP)São PauloBrazil; Renal Pathophysiology Laboratory (LIM16)Faculty of Medicine, University of São PauloSão PauloBrazil
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214
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Liang H, Ma Z, Peng H, He L, Hu Z, Wang Y. CXCL16 Deficiency Attenuates Renal Injury and Fibrosis in Salt-Sensitive Hypertension. Sci Rep 2016; 6:28715. [PMID: 27353044 PMCID: PMC4926114 DOI: 10.1038/srep28715] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 06/08/2016] [Indexed: 12/20/2022] Open
Abstract
Inflammation plays an important role in the pathogenesis of hypertensive kidney disease. However, the molecular mechanisms underlying the induction of inflammation are not completely understood. We have found that CXCL16 is induced in the kidney in deoxycorticosterone acetate (DOCA)-salt hypertension. Here we examined whether CXCL16 is involved in DOCA-salt-induced renal inflammation and fibrosis. Wild-type and CXCL16 knockout mice were subjected to uninephrectomy and DOCA-salt treatment for 3 weeks. There was no difference in blood pressure at baseline between wild-type and CXCL16 knockout mice. DOCA-salt treatment resulted in significant elevation in blood pressure that was comparable between wild-type and CXCL16 knockout mice. CXCL16 knockout mice exhibited less severe renal dysfunction, proteinuria, and fibrosis after DOCA-salt treatment compared with wild-type mice. CXCL16 deficiency attenuated extracellular matrix protein production and suppressed bone marrow–derived fibroblast accumulation and myofibroblast formation in the kidneys following DOCA-salt treatment. Furthermore, CXCL16 deficiency reduced macrophage and T cell infiltration into the kidneys in response to DOCA-salt hypertension. Taken together, our results indicate that CXCL16 plays a key role in the pathogenesis of renal injury and fibrosis in salt-sensitive hypertension through regulation of bone marrow–derived fibroblast accumulation and macrophage and T cell infiltration.
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Affiliation(s)
- Hua Liang
- Selzman Institute for Kidney Health and Section of Nephrology, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.,Department of Anesthesiology, Affiliated Foshan Hospital of Sun Yat-sen University, Foshan, China
| | - Zhiheng Ma
- Selzman Institute for Kidney Health and Section of Nephrology, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.,Section of Nephrology, Department of Medicine, Shuguang Hospital, Shanghai, China
| | - Hui Peng
- Selzman Institute for Kidney Health and Section of Nephrology, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.,Section of Nephrology, Department of Internal Medicine, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Liqun He
- Section of Nephrology, Department of Medicine, Shuguang Hospital, Shanghai, China
| | - Zhaoyong Hu
- Selzman Institute for Kidney Health and Section of Nephrology, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
| | - Yanlin Wang
- Selzman Institute for Kidney Health and Section of Nephrology, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.,Center for Translational Research on Inflammatory Diseases (CTRID) and Renal Section, Michael E. DeBakey VA Medical Center, Houston, Texas, USA
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215
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Sosa Peña MDP, Lopez-Soler R, Melendez JA. Senescence in chronic allograft nephropathy. Am J Physiol Renal Physiol 2016; 315:F880-F889. [PMID: 27306980 DOI: 10.1152/ajprenal.00195.2016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Despite increasing numbers of patients on dialysis, the numbers of renal transplants performed yearly have remained relatively static. During the last 50 years, there have been many advances in the pharmacology of prevention of organ rejection. However, most patients will suffer from a slow but steady decline in renal function leading to graft loss. The most common cause of long-term graft loss is chronic allograft nephropathy (CAN). Therefore, elucidating and understanding the mechanisms involved in CAN is crucial for achieving better posttransplant outcomes. It is thought that the development of epithelial to mesenchymal transition (EMT) in proximal tubules is one of the first steps towards CAN, and has been shown to be a result of cellular senescence. Cells undergoing senescence acquire a senescence associated secretory phenotype (SASP) leading to the production of interleukin-1 alpha (IL-1α), which has been implicated in several degenerative and inflammatory processes including renal disease. A central mediator in SASP activation is the production of reactive oxygen species (ROS), which are produced in response to numerous physiological and pathological stimuli. This review explores the connection between SASP and the development of EMT/CAN in an effort to suggest future directions for research leading to improved long-term graft outcomes.
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Affiliation(s)
| | - Reynold Lopez-Soler
- Albany Medical Center, Department of Surgery, Division of Transplantation, Albany, New York
| | - J Andrés Melendez
- SUNY Polytechnic Institute, Colleges of Nanoscale Science and Engineering, Albany, New York
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Endo N, Tsuboi N, Furuhashi K, Shi Y, Du Q, Abe T, Hori M, Imaizumi T, Kim H, Katsuno T, Ozaki T, Kosugi T, Matsuo S, Maruyama S. Urinary soluble CD163 level reflects glomerular inflammation in human lupus nephritis. Nephrol Dial Transplant 2016; 31:2023-2033. [PMID: 27242373 DOI: 10.1093/ndt/gfw214] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 04/17/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND In addition to classically activated macrophages that have effector roles in tissue injury, alternatively activated M2 macrophages are involved in the resolution of inflammation in animal models of kidney disease. To clarify the clinical relevance of macrophage phenotypes in human glomerular diseases, we evaluated the renal accumulation of macrophages and plasma and urine levels of CD163, an M2 marker, in lupus nephritis (LN) patients. METHODS Kidney biopsies and plasma and urine samples were obtained from LN patients who underwent renal biopsy between 2008 and 2012. CD163+, CD68+ and CD204+ cells were counted in paraffin-embedded and frozen sections. LN histological activity was evaluated semiquantitatively using the biopsy activity index. Plasma and urinary soluble CD163 (sCD163) concentrations were also measured and evaluated for their significance as potential LN biomarkers. RESULTS Immunohistological analysis of glomeruli from LN patients revealed that >60% of CD68+ macrophages had merged with CD163+ cells. The increased number of glomerular CD163+ macrophages was correlated with LN severity, as determined by the biopsy active index (r = 0.635). Urinary (u-) sCD163 level was strongly correlated with glomerular CD163+ cell counts and histological disease score as well as urinary monocyte chemoattractant protein 1 levels (r = 0.638 and 0.592, respectively). Furthermore, the u-sCD163 level was higher in patients with active LN than in those with other diseases. CONCLUSIONS Glomerular CD163+ macrophages are the predominant phenotype in the kidneys of lupus patients. These findings indicate that the u-sCD163 level can serve as a biomarker for macrophage-dependent glomerular inflammation in human LN.
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Affiliation(s)
- Nobuhide Endo
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Naotake Tsuboi
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Kazuhiro Furuhashi
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan.,Columbia Center for Translational Immunology, Department of Medicine, Surgery and Microbiology/Immunology, College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Yiqin Shi
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Qiuna Du
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Tomoko Abe
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Mayuko Hori
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Takahiro Imaizumi
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Hangsoo Kim
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Takayuki Katsuno
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Takenori Ozaki
- Department of Nephrology, Banbuntane Hotokukai Hospital and Fujita Health University, Nakagawa-ku, Nagoya, Aichi, Japan
| | - Tomoki Kosugi
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Seiichi Matsuo
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
| | - Shoichi Maruyama
- Department of Nephrology, Internal Medicine, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi, Japan
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217
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Matsui M, Roche L, Geroult S, Soupé-Gilbert ME, Monchy D, Huerre M, Goarant C. Cytokine and Chemokine Expression in Kidneys during Chronic Leptospirosis in Reservoir and Susceptible Animal Models. PLoS One 2016; 11:e0156084. [PMID: 27219334 PMCID: PMC4878748 DOI: 10.1371/journal.pone.0156084] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 05/09/2016] [Indexed: 01/24/2023] Open
Abstract
Leptospirosis is caused by pathogenic spirochetes of the genus Leptospira. Humans can be infected after exposure to contaminated urine of reservoir animals, usually rodents, regarded as typical asymptomatic carriers of leptospires. In contrast, accidental hosts may present an acute form of leptospirosis with a range of clinical symptoms including the development of Acute Kidney Injury (AKI). Chronic Kidney Disease (CKD) is considered as a possible AKI-residual sequela but little is known about the renal pathophysiology consequent to leptospirosis infection. Herein, we studied the renal morphological alterations in relation with the regulation of inflammatory cytokines and chemokines, comparing two experimental models of chronic leptospirosis, the golden Syrian hamster that survived the infection, becoming carrier of virulent leptospires, and the OF1 mouse, a usual reservoir of the bacteria. Animals were monitored until 28 days after injection with a virulent L. borgpetersenii serogroup Ballum to assess chronic infection. Hamsters developed morphological alterations in the kidneys with tubulointerstitial nephritis and fibrosis. Grading of lesions revealed higher scores in hamsters compared to the slight alterations observed in the mouse kidneys, irrespective of the bacterial load. Interestingly, pro-fibrotic TGF-β was downregulated in mouse kidneys. Moreover, cytokines IL-1β and IL-10, and chemokines MIP-1α/CCL3 and IP-10/CXCL-10 were significantly upregulated in hamster kidneys compared to mice. These results suggest a possible maintenance of inflammatory processes in the hamster kidneys with the infiltration of inflammatory cells in response to bacterial carriage, resulting in alterations of renal tissues. In contrast, lower expression levels in mouse kidneys indicated a better regulation of the inflammatory response and possible resolution processes likely related to resistance mechanisms.
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Affiliation(s)
- Mariko Matsui
- Institut Pasteur International Network, Institut Pasteur de Nouvelle-Calédonie, Leptospirosis Research and Expertise Unit, Noumea, New Caledonia
| | - Louise Roche
- Institut Pasteur International Network, Institut Pasteur de Nouvelle-Calédonie, Leptospirosis Research and Expertise Unit, Noumea, New Caledonia
| | - Sophie Geroult
- Institut Pasteur International Network, Institut Pasteur de Nouvelle-Calédonie, Leptospirosis Research and Expertise Unit, Noumea, New Caledonia
| | - Marie-Estelle Soupé-Gilbert
- Institut Pasteur International Network, Institut Pasteur de Nouvelle-Calédonie, Leptospirosis Research and Expertise Unit, Noumea, New Caledonia
| | - Didier Monchy
- Anatomic Pathology Laboratory, Gaston-Bourret Territorial Hospital Center, Noumea, New Caledonia
| | - Michel Huerre
- Unité de Recherche et Expertise en Histotechnologie et Pathologie, Institut Pasteur, Paris, France.,Departement de Pathologie, Institut Curie, Paris, France
| | - Cyrille Goarant
- Institut Pasteur International Network, Institut Pasteur de Nouvelle-Calédonie, Leptospirosis Research and Expertise Unit, Noumea, New Caledonia
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218
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Gong W, Mao S, Yu J, Song J, Jia Z, Huang S, Zhang A. NLRP3 deletion protects against renal fibrosis and attenuates mitochondrial abnormality in mouse with 5/6 nephrectomy. Am J Physiol Renal Physiol 2016; 310:F1081-8. [DOI: 10.1152/ajprenal.00534.2015] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 02/08/2016] [Indexed: 11/22/2022] Open
Abstract
Progressive fibrosis in chronic kidney disease (CKD) is the well-recognized cause leading to the progressive loss of renal function. Emerging evidence indicated a pathogenic role of the NACHT, LRR and PYD domains-containing protein 3 (NLRP3) inflammasome in mediating kidney injury. However, the role of NLRP3 in the remnant kidney disease model is still undefined. The present study was undertaken to evaluate the function of NLRP3 in modulating renal fibrosis in a CKD model of 5/6 nephrectomy (5/6 Nx) and the potential involvement of mitochondrial dysfunction in the pathogenesis. Employing NLRP3+/+ and NLRP3−/− mice with or without 5/6 Nx, we examined renal fibrotic response and mitochondrial function. Strikingly, tubulointerstitial fibrosis was remarkably attenuated in NLRP3−/− mice as evidenced by the blockade of extracellular matrix deposition. Meanwhile, renal tubular cells in NLRP3−/− mice maintained better mitochondrial morphology and higher mitochondrial DNA copy number, indicating an amelioration of mitochondrial abnormality. Moreover, NLRP3 deletion also blunted the severity of proteinuria and CKD-related hypertension. To further evaluate the direct role of NLRP3 in triggering fibrogenesis, mouse proximal tubular cells (PTCs) were subjected to transforming growth factor β1 (TGF-β1), and the cellular phenotypic changes were detected. As expected, TGF-β1-induced alterations of PTC phenotype were abolished by NLRP3 small interfering RNA, in line with a protection of mitochondrial function. Taken together, NLRP3 deletion protected against renal fibrosis in the 5/6 Nx disease model, possibly via inhibiting mitochondrial dysfunction.
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Affiliation(s)
- Wei Gong
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing 210008
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029; and
- Nanjing Key Laboratory of Pediatrics, Nanjing 210008, China
| | - Song Mao
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing 210008
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029; and
- Nanjing Key Laboratory of Pediatrics, Nanjing 210008, China
| | - Jing Yu
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing 210008
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029; and
- Nanjing Key Laboratory of Pediatrics, Nanjing 210008, China
| | - Jiayu Song
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing 210008
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029; and
- Nanjing Key Laboratory of Pediatrics, Nanjing 210008, China
| | - Zhanjun Jia
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing 210008
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029; and
- Nanjing Key Laboratory of Pediatrics, Nanjing 210008, China
| | - Songming Huang
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing 210008
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029; and
- Nanjing Key Laboratory of Pediatrics, Nanjing 210008, China
| | - Aihua Zhang
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing 210008
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029; and
- Nanjing Key Laboratory of Pediatrics, Nanjing 210008, China
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Rubio-Navarro A, Carril M, Padro D, Guerrero-Hue M, Tarín C, Samaniego R, Cannata P, Cano A, Villalobos JMA, Sevillano ÁM, Yuste C, Gutiérrez E, Praga M, Egido J, Moreno JA. CD163-Macrophages Are Involved in Rhabdomyolysis-Induced Kidney Injury and May Be Detected by MRI with Targeted Gold-Coated Iron Oxide Nanoparticles. Theranostics 2016; 6:896-914. [PMID: 27162559 PMCID: PMC4860897 DOI: 10.7150/thno.14915] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 03/18/2016] [Indexed: 02/07/2023] Open
Abstract
Macrophages play an important role in rhabdomyolysis-acute kidney injury (AKI), although the molecular mechanisms involved in macrophage differentiation are poorly understood. We analyzed the expression and regulation of CD163, a membrane receptor mainly expressed by anti-inflammatory M2 macrophages, in rhabdomyolysis-AKI and developed targeted probes for its specific detection in vivo by MRI. Intramuscular injection of glycerol in mice promoted an early inflammatory response, with elevated proportion of M1 macrophages, and partial differentiation towards a M2 phenotype in later stages, where increased CD163 expression was observed. Immunohistological studies confirmed the presence of CD163-macrophages in human rhabdomyolysis-AKI. In cultured macrophages, myoglobin upregulated CD163 expression via HO-1/IL-10 axis. Moreover, we developed gold-coated iron oxide nanoparticles vectorized with an anti-CD163 antibody that specifically targeted CD163 in kidneys from glycerol-injected mice, as determined by MRI studies, and confirmed by electron microscopy and immunological analysis. Our findings are the first to demonstrate that CD163 is present in both human and experimental rhabdomyolysis-induced AKI, suggesting an important role of this molecule in this pathological condition. Therefore, the use of probes targeting CD163-macrophages by MRI may provide important information about the cellular composition of renal lesion in rhabdomyolysis.
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220
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Olmes G, Büttner-Herold M, Ferrazzi F, Distel L, Amann K, Daniel C. CD163+ M2c-like macrophages predominate in renal biopsies from patients with lupus nephritis. Arthritis Res Ther 2016; 18:90. [PMID: 27091114 PMCID: PMC4835936 DOI: 10.1186/s13075-016-0989-y] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 04/05/2016] [Indexed: 02/04/2023] Open
Abstract
Background The role of macrophages in the pathogenesis of lupus nephritis, in particular their differentiation to a certain subtype (e.g., M1- or M2-like) modulating the inflammatory reaction, is unknown. Here we investigated whether the differentiation in M1- or M2-like macrophages depends on the stage of lupus nephritis and whether this correlates with clinical parameters. Method Using immunohistochemical analysis we analyzed renal biopsies from 68 patients with lupus nephritis (ISN/RPS classes II–V) for infiltration with M1-like (iNOS+/CD68+), M2a-like (CD206+/CD68+), M2c-like macrophages (CD163+/CD68+), and FoxP3+ regulatory T-cells. In addition, clinical parameters at the time of renal biopsy, i.e., blood pressure, proteinuria and serum urea were correlated with the macrophage infiltration using the Spearman test. Results The mean number of CD68+ macrophages was related to the diagnosed ISN/RPS class, showing the highest macrophage infiltration in biopsies with diffuse class IV and the lowest number in ISN/RPS class V. In all ISN/RPS classes we detected more M2c-like CD163+/CD68+ than M2a-like CD206+/CD68+ cells, while M1-macrophages played only a minor role. Cluster analysis using macrophage subtype numbers in different renal compartments revealed three main clusters showing cluster 1 dominated by class V. Clusters 2 and 3 were dominated by lupus class IV indicating that this class can be further differentiated by its macrophage population. The number of tubulointerstitial FoxP3+ cells correlated with all investigated macrophage subtypes showing the strongest association to numbers of M2a-like macrophages. Kidney function, as assessed by serum creatinine and serum urea, correlated positively with the number of total CD68+, M2a-like and M2c-like macrophages in the tubulointerstitium. In addition, total CD68+ and M2c-like macrophage numbers highly correlated with Austin activity score. Interestingly, in hypertensive lupus patients only the number of M2a-like macrophages was significantly increased compared to biopsies from normotensive lupus patients. Conclusion M2-like macrophages are the dominant subpopulation in human lupus nephritis and particularly, M2a subpopulations were associated with disease progression, but their role in disease progression remains unclear.
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Affiliation(s)
- Gregor Olmes
- Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Krankenhausstr. 8-10, 91054, Erlangen, Germany
| | - Maike Büttner-Herold
- Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Krankenhausstr. 8-10, 91054, Erlangen, Germany
| | - Fulvia Ferrazzi
- Institute of Human Genetics, FAU Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Luitpold Distel
- Department of Radiation Oncology, FAU Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Kerstin Amann
- Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Krankenhausstr. 8-10, 91054, Erlangen, Germany
| | - Christoph Daniel
- Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Krankenhausstr. 8-10, 91054, Erlangen, Germany.
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Cao Q, Harris DCH, Wang Y. Macrophages in kidney injury, inflammation, and fibrosis. Physiology (Bethesda) 2016; 30:183-94. [PMID: 25933819 DOI: 10.1152/physiol.00046.2014] [Citation(s) in RCA: 195] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Macrophages are found in normal kidney and in increased numbers in diseased kidney, where they act as key players in renal injury, inflammation, and fibrosis. Macrophages are highly heterogeneous cells and exhibit distinct phenotypic and functional characteristics in response to various stimuli in the local microenvironment in different types of kidney disease. In kidney tissue necrosis and/or infection, damage- and/or pathogen-associated molecular patterns induce pro-inflammatory macrophages, which contribute to further tissue injury, inflammation, and subsequent fibrosis. Apoptotic cells and anti-inflammatory factors in post-inflammatory tissues induced anti-inflammatory macrophages, which can mediate kidney repair and regeneration. This review summarizes the role of macrophages with different phenotypes in kidney injury, inflammation, and fibrosis in various acute and chronic kidney diseases. Understanding alterations of kidney microenvironment and the factors that control the phenotype and functions of macrophages may offer an avenue for the development of new cellular and cytokine/growth factor-based therapies as alternative treatment options for patients with kidney disease.
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Affiliation(s)
- Qi Cao
- Centre for Transplant and Renal Research, Westmead Millennium Institute, University of Sydney, Sydney, New South Wales, Australia
| | - David C H Harris
- Centre for Transplant and Renal Research, Westmead Millennium Institute, University of Sydney, Sydney, New South Wales, Australia
| | - Yiping Wang
- Centre for Transplant and Renal Research, Westmead Millennium Institute, University of Sydney, Sydney, New South Wales, Australia
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222
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Links between coagulation, inflammation, regeneration, and fibrosis in kidney pathology. J Transl Med 2016; 96:378-90. [PMID: 26752746 DOI: 10.1038/labinvest.2015.164] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 09/22/2015] [Indexed: 12/14/2022] Open
Abstract
Acute kidney injury (AKI) involves nephron injury leading to irreversible nephron loss, ie, chronic kidney disease (CKD). Both AKI and CKD are associated with distinct histological patterns of tissue injury, but kidney atrophy in CKD involves tissue remodeling with interstitial inflammation and scarring. No doubt, nephron atrophy, inflammation, fibrosis, and renal dysfunction are associated with each other, but their hierarchical relationships remain speculative. To better understand the pathophysiology, we provide an overview of the fundamental danger response programs that assure host survival upon traumatic injury from as early as the first multicellular organisms, ie, bleeding control by coagulation, infection control by inflammation, epithelial barrier restoration by re-epithelialization, and tissue stabilization by mesenchymal repair. Although these processes assure survival in the majority of the populations, their dysregulation causes kidney disease in a minority. We discuss how, in genetically heterogeneous population, genetic variants shift balances and modulate danger responses toward kidney disease. We further discuss how classic kidney disease entities develop from an insufficient or overshooting activation of these danger response programs. Finally, we discuss molecular pathways linking, for example, inflammation and regeneration or inflammation and fibrosis. Understanding the causative and hierarchical relationships and the molecular links between the danger response programs should help to identify molecular targets to modulate kidney injury and to improve outcomes for kidney disease patients.
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223
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Fullerton JN, Gilroy DW. Resolution of inflammation: a new therapeutic frontier. Nat Rev Drug Discov 2016; 15:551-67. [PMID: 27020098 DOI: 10.1038/nrd.2016.39] [Citation(s) in RCA: 565] [Impact Index Per Article: 70.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Dysregulated inflammation is a central pathological process in diverse disease states. Traditionally, therapeutic approaches have sought to modulate the pro- or anti-inflammatory limbs of inflammation, with mixed success. However, insight into the pathways by which inflammation is resolved has highlighted novel opportunities to pharmacologically manipulate these processes - a strategy that might represent a complementary (and perhaps even superior) therapeutic approach. This Review discusses the state of the art in the biology of resolution of inflammation, highlighting the opportunities and challenges for translational research in this field.
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Affiliation(s)
- James N Fullerton
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, UK
| | - Derek W Gilroy
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, UK
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Abstract
BACKGROUND CD163, a marker of M2 macrophages, possesses anti-inflammatory properties. This study aims to investigate the clinicopathological significance of CD163-positive macrophages in proliferative glomerulonephritis. METHODS Renal tissue samples from patients with lupus nephritis (LN, n = 22), antineutrophil cytoplasmic autoantibody (ANCA)-associated pauci-immune necrotizing glomerulonephritis (PNGN, n = 10), type 1 membranoproliferative glomerulonephritis (n = 5), minimal change disease (n = 8) and normal control kidneys (n = 3) were included in this study. The expression of CD163, CD68, CD20 and CD3 in renal tissues was detected by immunohistochemistry or immunofluorescence. The level of urinary neutrophil gelatinase-associated lipocalin (NGAL) was determined by enzyme-linked immunosorbent assay. RESULTS CD163 was mainly expressed in active crescentic glomerulonephritis, proliferative glomerular lesions and areas of tubulointerstitial injury. Patients with LN-IV and PNGN had numerous CD163-positive cells in glomerular and acute tubulointerstitial lesions. CD163-positive cells in glomeruli positively correlated to proteinuria yet negatively correlated to estimated glomerular filtration rate. There was a positive correlation between the number of CD163 cells in acute tubulointerstitial lesions and NGAL levels, whereas a negative correlation between CD163 numbers and estimated glomerular filtration rate. The number of CD163-positive cells in crescentic glomerulonephritis was more than other groups. In LN, the number of CD163 cells in the tubulointerstitial and glomerular lesions had a positive correlation with activity index. Dual staining showed that CD163-positive cells also expressed CD68, although they did not show any staining for CD20 or CD3. CONCLUSIONS CD163-positive macrophages were involved in the pathogenesis of proliferative glomerular lesions, active crescentic glomerulonephritis and acute tubular injury of patients with PNGN and active LN.
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Chen X, Wei SY, Li JS, Zhang QF, Wang YX, Zhao SL, Yu J, Wang C, Qin Y, Wei QJ, Lv GX, Li B. Overexpression of Heme Oxygenase-1 Prevents Renal Interstitial Inflammation and Fibrosis Induced by Unilateral Ureter Obstruction. PLoS One 2016; 11:e0147084. [PMID: 26765329 PMCID: PMC4713170 DOI: 10.1371/journal.pone.0147084] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 12/27/2015] [Indexed: 02/07/2023] Open
Abstract
Renal fibrosis plays an important role in the onset and progression of chronic kidney diseases. Many studies have demonstrated that heme oxygenase-1 (HO-1) is involved in diverse biological processes as a cytoprotective molecule, including anti-inflammatory, anti-oxidant, anti-apoptotic, antiproliferative, and immunomodulatory effects. However, the mechanisms of HO-1 prevention in renal interstitial fibrosis remain unknown. In this study, HO-1 transgenic (TG) mice were employed to investigate the effect of HO-1 on renal fibrosis using a unilateral ureter obstruction (UUO) model and to explore the potential mechanisms. We found that HO-1 was adaptively upregulated in kidneys of both TG and wild type (WT) mice after UUO. The levels of HO-1 mRNA and protein were increased in TG mice compared with WT mice under normal conditions. HO-1 expression was further enhanced after UUO and remained high during the entire experimental process. Renal interstitial fibrosis in the TG group was significantly attenuated compared with that in the WT group after UUO. Moreover, overexpression of HO-1 inhibited the loss of peritubular capillaries. In addition, UUO-induced activation and proliferation of myofibroblasts were suppressed by HO-1 overexpression. Furthermore, HO-1 restrained tubulointerstitial infiltration of macrophages and regulated the secretion of inflammatory cytokines in UUO mice. We also found that high expression of HO-1 inhibited reactivation of Wnt/β-catenin signaling, which could play a crucial role in attenuating renal fibrosis. In conclusion, these data suggest that HO-1 prevents renal tubulointerstitial fibrosis possibly by regulating the inflammatory response and Wnt/β-catenin signaling. This study provides evidence that augmentation of HO-1 levels may be a therapeutic strategy against renal interstitial fibrosis.
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Affiliation(s)
- Xiao Chen
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Shi-Yao Wei
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jian-Si Li
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Qing-Fang Zhang
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Yu-Xiao Wang
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Shi-Lei Zhao
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jing Yu
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Chang Wang
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Ying Qin
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Qiu-Ju Wei
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Gui-Xiang Lv
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- * E-mail: (BL); (G-XL)
| | - Bing Li
- Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
- * E-mail: (BL); (G-XL)
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Sureshbabu A, Muhsin SA, Choi ME. TGF-β signaling in the kidney: profibrotic and protective effects. Am J Physiol Renal Physiol 2016; 310:F596-F606. [PMID: 26739888 DOI: 10.1152/ajprenal.00365.2015] [Citation(s) in RCA: 177] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 01/04/2016] [Indexed: 12/31/2022] Open
Abstract
Transforming growth factor-β (TGF-β) is generally considered as a central mediator of fibrotic diseases. Indeed, much focus has been placed on inhibiting TGF-β and its downstream targets as ideal therapeutic strategies. However, pharmacological blockade of TGF-β has not yet translated into successful therapy for humans, which may be due to pleiotropic effects of TGF-β signaling. Equally, TGF-β signaling as a protective response in kidney injury has been relatively underexplored. An emerging body of evidence from experimental kidney disease models indicates multifunctionality of TGF-β capable of inducing profibrotic and protective effects. This review discusses recent advances highlighting the diverse roles of TGF-β in promoting not only renal fibrosis but also protective responses of TGF-β signaling. We review, in particular, growing evidence that supports protective effects of TGF-β by mechanisms which include inhibiting inflammation and induction of autophagy. Additional detailed studies are required to fully understand the diverse mechanisms of TGF-β actions in renal fibrosis and inflammation that will likely direct toward effective antifibrotic therapies.
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Affiliation(s)
- Angara Sureshbabu
- Division of Nephrology and Hypertension, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, New York; and
| | - Saif A Muhsin
- New York-Presbyterian Hospital-Weill Cornell Medical Center, New York, New York
| | - Mary E Choi
- Division of Nephrology and Hypertension, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, New York; and .,New York-Presbyterian Hospital-Weill Cornell Medical Center, New York, New York
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227
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Aldosterone Induces Renal Fibrosis and Inflammatory M1-Macrophage Subtype via Mineralocorticoid Receptor in Rats. PLoS One 2016; 11:e0145946. [PMID: 26730742 PMCID: PMC4701403 DOI: 10.1371/journal.pone.0145946] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 12/10/2015] [Indexed: 01/03/2023] Open
Abstract
We aimed to evaluate macrophages heterogeneity and structural, functional and inflammatory alterations in rat kidney by aldosterone + salt administration. The effects of treatment with spironolactone on above parameters were also analyzed. Male Wistar rats received aldosterone (1 mgkg-1d-1) + 1% NaCl for 3 weeks. Half of the animals were treated with spironolactone (200 mg kg-1d-1). Systolic and diastolic blood pressures were elevated (p<0.05) in aldosterone + salt–treated rats. Relative kidney weight, collagen content, fibronectin, macrophage infiltrate, CTGF, Col I, MMP2, TNF-α, CD68, Arg2, and SGK-1 were increased (p<0.05) in aldosterone + salt–treated rats, being reduced by spironolactone (p<0.05). Increased iNOS and IFN-γ mRNA gene expression (M1 macrophage markers) was observed in aldosterone + salt rats, whereas no significant differences were observed in IL-10 and gene ArgI mRNA expression or ED2 protein content (M2 macrophage markers). All the observed changes were blocked with spironolactone treatment. Macrophage depletion with liposomal clodronate reduced macrophage influx and inflammatory M1 markers (INF-γ or iNOS), whereas interstitial fibrosis was only partially reduced after this intervention, in aldosterone plus salt-treated rats. In conclusion, aldosterone + salt administration mediates inflammatory M1 macrophage phenotype and increased fibrosis throughout mineralocorticoid receptors activation.
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228
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Macrophage and Multinucleated Giant Cell Classification. CURRENT TOPICS IN ENVIRONMENTAL HEALTH AND PREVENTIVE MEDICINE 2016. [DOI: 10.1007/978-4-431-55732-6_1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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229
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Bhatt K, Lanting LL, Jia Y, Yadav S, Reddy MA, Magilnick N, Boldin M, Natarajan R. Anti-Inflammatory Role of MicroRNA-146a in the Pathogenesis of Diabetic Nephropathy. J Am Soc Nephrol 2015; 27:2277-88. [PMID: 26647423 DOI: 10.1681/asn.2015010111] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 10/15/2015] [Indexed: 12/14/2022] Open
Abstract
Inflammation has a critical role in the pathogenesis of diabetic complications, including diabetic nephropathy (DN). MicroRNAs have recently emerged as important regulators of DN. However, the role of microRNAs in the regulation of inflammation during DN is poorly understood. Here, we examined the in vivo role of microRNA-146a (miR-146a), a known anti-inflammatory microRNA, in the pathogenesis of DN. In a model of streptozotocin-induced diabetes, miR-146a(-/-) mice showed significantly exacerbated proteinuria, renal macrophage infiltration, glomerular hypertrophy, and fibrosis relative to the respective levels in control wild-type mice. Diabetes-induced upregulation of proinflammatory and profibrotic genes was significantly greater in the kidneys of miR-146a(-/-) than in the kidneys of wild-type mice. Notably, miR-146a expression increased in both peritoneal and intrarenal macrophages in diabetic wild-type mice. Mechanistically, miR-146a deficiency during diabetes led to increased expression of M1 activation markers and suppression of M2 markers in macrophages. Concomitant with increased expression of proinflammatory cytokines, such as IL-1β and IL-18, markers of inflammasome activation also increased in the macrophages of diabetic miR-146a(-/-) mice. These studies suggest that in early DN, miR-146a upregulation exerts a protective effect by downregulating target inflammation-related genes, resulting in suppression of proinflammatory and inflammasome gene activation. Loss of this protective mechanism in miR-146a(-/-) mice leads to accelerated DN. Taken together, these results identify miR-146a as a novel anti-inflammatory noncoding RNA modulator of DN.
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Affiliation(s)
| | | | - Ye Jia
- Department of Diabetes Complications
| | | | | | - Nathaniel Magilnick
- Department of Molecular and Cellular Biology, and Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute of City of Hope National Medical Center, Duarte, California
| | - Mark Boldin
- Department of Molecular and Cellular Biology, and
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230
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Dias CB, Malafronte P, Lee J, Resende A, Jorge L, Pinheiro CC, Malheiros D, Woronik V. Role of renal expression of CD68 in the long-term prognosis of proliferative lupus nephritis. J Nephrol 2015; 30:87-94. [DOI: 10.1007/s40620-015-0252-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 11/18/2015] [Indexed: 11/30/2022]
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231
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Sun XY, Gan QZ, Ouyang JM. Calcium oxalate toxicity in renal epithelial cells: the mediation of crystal size on cell death mode. Cell Death Discov 2015; 1:15055. [PMID: 27551481 PMCID: PMC4979418 DOI: 10.1038/cddiscovery.2015.55] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 10/06/2015] [Accepted: 10/16/2015] [Indexed: 12/14/2022] Open
Abstract
The cytotoxicity of calcium oxalate (CaOx) in renal epithelial cells has been studied extensively, but the cell death mode induced by CaOx with different physical properties, such as crystal size and crystal phase, has not been studied in detail. In this study, we comparatively investigated the differences of cell death mode induced by nano-sized (50 nm) and micron-sized (10 μm) calcium oxalate monohydrate (COM) and calcium oxalate dihydrate (COD) to explore the cell death mechanism. The effect of the exposure of nano-/micron-sized COM and COD crystals toward the African green monkey renal epithelial (Vero) cells were investigated by detecting cell cytoskeleton changes, lysosomal integrity, mitochondrial membrane potential (Δψm), apoptosis and/or necrosis, osteopontin (OPN) expression, and malondialdehyde (MDA) release. Nano-/micron-sized COM and COD crystals could cause apoptosis and necrosis simultaneously. Nano-sized crystals primarily caused apoptotic cell death, leading to cell shrinkage, phosphatidylserine ectropion, and nuclear shrinkage, whereas micron-sized crystals primarily caused necrotic cell death, leading to cell swelling and cell membrane and lysosome rupture. Nano-sized COM and COD crystals induced much greater cell death (sum of apoptosis and necrosis) than micron-sized crystals, and COM crystals showed higher cytotoxicity than the same-sized COD crystals. Both apoptosis and necrosis could lead to mitochondria depolarization and elevate the expression of OPN and the generation of lipid peroxidation product MDA. The amount of expressed OPN and generated MDA was positively related to cell injury degree. The physicochemical properties of crystals could affect the cell death mode. The results of this study may provide a basis for future studies on cell death mechanisms.
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Affiliation(s)
- X-Y Sun
- Department of Chemistry, Jinan University, Guangzhou 510632, China
- Institute of Biomineralization and Lithiasis Research, Guangzhou 510632, China
| | - Q-Z Gan
- Department of Chemistry, Jinan University, Guangzhou 510632, China
- Institute of Biomineralization and Lithiasis Research, Guangzhou 510632, China
| | - J-M Ouyang
- Department of Chemistry, Jinan University, Guangzhou 510632, China
- Institute of Biomineralization and Lithiasis Research, Guangzhou 510632, China
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232
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Engineering macrophages to control the inflammatory response and angiogenesis. Exp Cell Res 2015; 339:300-9. [PMID: 26610863 DOI: 10.1016/j.yexcr.2015.11.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 11/14/2015] [Accepted: 11/19/2015] [Indexed: 12/17/2022]
Abstract
Macrophage (MΦ) dysregulation is increasingly becoming recognized as a risk factor for a number of inflammatory complications including atherosclerosis, cancer, and the host response elicited by biomedical devices. It is still unclear what roles the pro-inflammatory (M1) MΦ and pro-healing (M2) MΦ phenotypes play during the healing process. However, it has been shown that a local overabundance of M1 MΦs can potentially lead to a chronically inflamed state of the tissue; while a local over-exuberant M2 MΦ response can lead to tissue fibrosis and even promote tumorigenesis. These notions strengthen the argument that the tight temporal regulation of this phenotype balance is necessary to promote inflammatory resolution that leads to tissue homeostasis. In this study, we have engineered pro-inflammatory MΦs, MΦ-cTLR4 cells, which can be activated to a M1-like MΦ phenotype with a small molecule, the chemical inducer of dimerization (CID) drug. The MΦ-cTLR4 cells when activated with the CID drug, express increased levels of TNFα, IL-6, and iNOS. Activated MΦ-cTLR4 cells stay stimulated for at least 48h; once the CID drug is withdrawn, the MΦ-cTLR4 cells return to baseline state within 18h. Further, in vitro CID-activated MΦ-cTLR4 cells induce upregulation of VCAM-1 and ICAM-1 on endothelial cells (EC) in a TNFα-dependent manner. With the ability to specifically modulate the MФ-cTLR4 cells with the presence or absence of a small molecule, we now have the tool necessary to observe a primarily M1 MФ response during inflammation. By isolating this phase of the wound healing response, it may be possible to determine conditions for ideal healing.
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233
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Abstract
Despite marked improvements in the survival of patients with severe lupus nephritis over the past 50 years, the rate of complete clinical remission after immune suppression therapy is <50% and renal impairment still occurs in 40% of affected patients. An appreciation of the factors that lead to the development of chronic kidney disease following acute or subacute renal injury in patients with systemic lupus erythematosus is beginning to emerge. Processes that contribute to end-stage renal injury include continuing inflammation, activation of intrinsic renal cells, cell stress and hypoxia, metabolic abnormalities, aberrant tissue repair and tissue fibrosis. A deeper understanding of these processes is leading to the development of novel or adjunctive therapies that could protect the kidney from the secondary non-immune consequences of acute injury. Approaches based on a molecular-proteomic-lipidomic classification of disease should yield new information about the functional basis of disease heterogeneity so that the most effective and least toxic treatment regimens can be formulated for individual patients.
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234
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Adhyatmika A, Putri KSS, Beljaars L, Melgert BN. The Elusive Antifibrotic Macrophage. Front Med (Lausanne) 2015; 2:81. [PMID: 26618160 PMCID: PMC4643133 DOI: 10.3389/fmed.2015.00081] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 10/29/2015] [Indexed: 12/23/2022] Open
Abstract
Fibrotic diseases, especially of the liver, the cardiovascular system, the kidneys, and the lungs, account for approximately 45% of deaths in Western societies. Fibrosis is a serious complication associated with aging and/or chronic inflammation or injury and cannot be treated effectively yet. It is characterized by excessive deposition of extracellular matrix (ECM) proteins by myofibroblasts and impaired degradation by macrophages. This ultimately destroys the normal structure of an organ, which leads to loss of function. Most efforts to develop drugs have focused on inhibiting ECM production by myofibroblasts and have not yielded many effective drugs yet. Another option is to stimulate the cells that are responsible for degradation and uptake of excess ECM, i.e., antifibrotic macrophages. However, macrophages are plastic cells that have many faces in fibrosis, including profibrotic behavior-stimulating ECM production. This can be dependent on their origin, as the different organs have tissue-resident macrophages with different origins and a various influx of incoming monocytes in steady-state conditions and during fibrosis. To be able to pharmacologically stimulate the right kind of behavior in fibrosis, a thorough characterization of antifibrotic macrophages is necessary, as well as an understanding of the signals they need to degrade ECM. In this review, we will summarize the current state of the art regarding the antifibrotic macrophage phenotype and the signals that stimulate its behavior.
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Affiliation(s)
- Adhyatmika Adhyatmika
- Department of Pharmacokinetics, Toxicology and Targeting, Groningen Research Institute for Pharmacy (GRIP), University of Groningen , Groningen , Netherlands
| | - Kurnia S S Putri
- Department of Pharmacokinetics, Toxicology and Targeting, Groningen Research Institute for Pharmacy (GRIP), University of Groningen , Groningen , Netherlands ; Department of Pharmaceutical Technology and Biopharmacy, Groningen Research Institute for Pharmacy (GRIP), University of Groningen , Groningen , Netherlands ; Faculty of Pharmacy, University of Indonesia , Depok , Indonesia
| | - Leonie Beljaars
- Department of Pharmacokinetics, Toxicology and Targeting, Groningen Research Institute for Pharmacy (GRIP), University of Groningen , Groningen , Netherlands
| | - Barbro N Melgert
- Department of Pharmacokinetics, Toxicology and Targeting, Groningen Research Institute for Pharmacy (GRIP), University of Groningen , Groningen , Netherlands ; GRIAC Research Institute, University Medical Center Groningen, University of Groningen , Groningen , Netherlands
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235
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Protective Effects of Paricalcitol on Peritoneal Remodeling during Peritoneal Dialysis. BIOMED RESEARCH INTERNATIONAL 2015; 2015:468574. [PMID: 26605330 PMCID: PMC4641933 DOI: 10.1155/2015/468574] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 09/10/2015] [Accepted: 10/01/2015] [Indexed: 11/17/2022]
Abstract
Peritoneal dialysis (PD) is associated with structural and functional alterations of the peritoneal membrane, consisting of fibrosis, angiogenesis, and loss of ultrafiltration capacity. Vitamin D receptor activation (VDRA) plays an important role in mineral metabolism and inflammation, but also antiangiogenic and antifibrotic properties have been reported. Therefore, the effects of active vitamin D treatment on peritoneal function and remodeling were investigated. Rats were either kept naïve to PDF exposure or daily exposed to 10 mL PDF and were treated for five or seven weeks with oral paricalcitol or vehicle control. Non-PDF-exposed rats showed no peritoneal changes upon paricalcitol treatment. Paricalcitol reduced endogenous calcitriol but did not affect mineral homeostasis. However, upon PDF exposure, loss of ultrafiltration capacity ensued which was fully rescued by paricalcitol treatment. Furthermore, PD-induced ECM thickening was significantly reduced and omental PD-induced angiogenesis was less pronounced upon paricalcitol treatment. No effect of paricalcitol treatment on total amount of peritoneal cells, peritoneal leukocyte composition, and epithelial to mesenchymal transition (EMT) was observed. Our data indicates that oral VDRA reduces tissue remodeling during chronic experimental PD and prevents loss of ultrafiltration capacity. Therefore, VDRA is potentially relevant in the prevention of treatment technique failure in PD patients.
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236
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Baba I, Egi Y, Utsumi H, Kakimoto T, Suzuki K. Inhibitory effects of fasudil on renal interstitial fibrosis induced by unilateral ureteral obstruction. Mol Med Rep 2015; 12:8010-20. [PMID: 26498136 PMCID: PMC4758322 DOI: 10.3892/mmr.2015.4467] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 08/25/2015] [Indexed: 02/07/2023] Open
Abstract
Renal fibrosis is the major cause of chronic kidney disease, and the Rho/Rho-associated coiled-coil kinase (ROCK) signaling cascade is involved in the renal fibrotic processes. Several studies have reported that ROCK inhibitors attenuate renal fibrosis. However, the mechanism of this process remains to be fully elucidated. The present study assessed the inhibitory effect of fasudil, a ROCK inhibitor using immunohistochemistry, reverse transcription-quantitative polymerase chain reaction and western blot analyses, in vivo and in vitro, to elucidate the mechanisms underlying renal interstitial fibrosis. In mice induced with unilateral ureteral obstruction (UUO), collagen accumulation, the expression of fibrosis-associated genes and the content of hydroxyproline in the kidney increased 3, 7, and 14 days following UUO. Fasudil attenuated the histological changes, and the production of collagen and extracellular matrix in the UUO kidney. The expression of α-smooth muscle actin (α-SMA) and the transforming growth factor-β (TGFβ)-Smad signaling pathway, and macrophage infiltration were suppressed by fasudil in the kidneys of the UUO mice. The present study also evaluated the role of intrinsic renal cells and infiltrated macrophages using NRK-52E, NRK-49F and RAW264.7 cells. The mRNA and protein expression levels of collagen I and α-SMA increased in the NRK-52E and NRK-49F cells stimulated by TGF-β1. Hydroxyfasudil, a bioactive metabolite of fasudil, attenuated the increase in the mRNA and protein expression levles of α-SMA in the two cell types. However, the reduction in the mRNA expression of collagen I was observed in the NRK-49F cells only. Hydroxyfasudil decreased the mRNA expression of monocyte chemoattractant protein-1 (MCP-1) induced by TGF-β1 in the NRK-52E cells, but not in the NRK-49F cells. In the RAW264.7 cells, the mRNA expression levels of MCP-1, interleukin (IL)-1β, IL-6 and tumor necrosis factor α were increased significantly following lipopolysaccharide stimulation, and were not suppressed by hydroxyfasudil. These data suggested that the inhibition of ROCK activity by fasudil suppressed the transformation of renal intrinsic cells into the myofibroblast cells, and attenuated the infiltration of macrophages, without inhibiting the expression or the activation of cytokine/chemokines, in the progression of renal interstitial fibrosis.
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Affiliation(s)
- Itsuko Baba
- Pharmacology Research Laboratories II, Research Division, Mitsubishi Tanabe Pharma Corporation, Toda‑shi, Saitama 335‑8505, Japan
| | - Yasuhiro Egi
- Pharmacology Research Laboratories II, Research Division, Mitsubishi Tanabe Pharma Corporation, Toda‑shi, Saitama 335‑8505, Japan
| | - Hiroyuki Utsumi
- Safety Research Laboratory, Research Division, Mitsubishi Tanabe Pharma Corporation, Toda‑shi, Saitama 335‑8505, Japan
| | - Tetsuhiro Kakimoto
- Safety Research Laboratory, Research Division, Mitsubishi Tanabe Pharma Corporation, Toda‑shi, Saitama 335‑8505, Japan
| | - Kazuo Suzuki
- Pharmacology Research Laboratories II, Research Division, Mitsubishi Tanabe Pharma Corporation, Toda‑shi, Saitama 335‑8505, Japan
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237
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Souza ACP, Tsuji T, Baranova IN, Bocharov AV, Wilkins KJ, Street JM, Alvarez-Prats A, Hu X, Eggerman T, Yuen PST, Star RA. TLR4 mutant mice are protected from renal fibrosis and chronic kidney disease progression. Physiol Rep 2015; 3:3/9/e12558. [PMID: 26416975 PMCID: PMC4600397 DOI: 10.14814/phy2.12558] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Chronic kidney disease (CKD) is associated with persistent low-grade inflammation and immunosuppression. In this study we tested the role of Toll-like receptor 4, the main receptor for endotoxin (LPS), in a mouse model of renal fibrosis and in a model of progressive CKD that better resembles the human disease. C3HeJ (TLR4 mutant) mice have a missense point mutation in the TLR4 gene, rendering the receptor nonfunctional. In a model of renal fibrosis after folic acid injection, TLR4 mutant mice developed less interstititial fibrosis in comparison to wild-type (WT) mice. Furthermore, 4 weeks after 5/6 nephrectomy with continuous low-dose angiotensin II infusion, C3HeOuJ (TLR4 WT) mice developed progressive CKD with albuminuria, increased serum levels of BUN and creatinine, glomerulosclerosis, and interstitial fibrosis, whereas TLR4 mutant mice were significantly protected from CKD progression. TLR4 WT mice also developed low-grade systemic inflammation, splenocyte apoptosis and increased expression of the immune inhibitory receptor PD-1 in the spleen, which were not observed in TLR4 mutant mice. In vitro, endotoxin (LPS) directly upregulated NLRP3 inflammasome expression in renal epithelial cells via TLR4. In summary, TLR4 contributes to renal fibrosis and CKD progression, at least in part, via inflammasome activation in renal epithelial cells, and may also participate in the dysregulated immune response that is associated with CKD.
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Affiliation(s)
- Ana C P Souza
- Renal Diagnostics and Therapeutics Unit, NIDDK NIH, Bethesda, Maryland
| | - Takayuki Tsuji
- Renal Diagnostics and Therapeutics Unit, NIDDK NIH, Bethesda, Maryland
| | - Irina N Baranova
- Department of Laboratory Medicine, Clinical Center NIH, Bethesda, Maryland
| | | | - Kenneth J Wilkins
- Biostatistics Program, Office of Director, NIDDK NIH, Bethesda, Maryland
| | - Jonathan M Street
- Renal Diagnostics and Therapeutics Unit, NIDDK NIH, Bethesda, Maryland
| | | | - Xuzhen Hu
- Renal Diagnostics and Therapeutics Unit, NIDDK NIH, Bethesda, Maryland
| | - Thomas Eggerman
- Department of Laboratory Medicine, Clinical Center NIH, Bethesda, Maryland Division of Diabetes, Endocrinology, and Metabolic Diseases, NIDDK NIH, Bethesda, Maryland
| | - Peter S T Yuen
- Renal Diagnostics and Therapeutics Unit, NIDDK NIH, Bethesda, Maryland
| | - Robert A Star
- Renal Diagnostics and Therapeutics Unit, NIDDK NIH, Bethesda, Maryland
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238
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Nutter FH, Haylor JL, Khwaja A. Inhibiting ERK Activation with CI-1040 Leads to Compensatory Upregulation of Alternate MAPKs and Plasminogen Activator Inhibitor-1 following Subtotal Nephrectomy with No Impact on Kidney Fibrosis. PLoS One 2015; 10:e0137321. [PMID: 26415098 PMCID: PMC4586140 DOI: 10.1371/journal.pone.0137321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 08/15/2015] [Indexed: 11/27/2022] Open
Abstract
Extracellular-signal regulated kinase (ERK) activation by MEK plays a key role in many of the cellular processes that underlie progressive kidney fibrosis including cell proliferation, apoptosis and transforming growth factor β1-mediated epithelial to mesenchymal transition. We therefore assessed the therapeutic impact of ERK1/2 inhibition using a MEK inhibitor in the rat 5/6 subtotal nephrectomy (SNx) model of kidney fibrosis. There was a twentyfold upregulation in phospho-ERK1/2 expression in the kidney after SNx in Male Wistar rats. Rats undergoing SNx became hypertensive, proteinuric and developed progressive kidney failure with reduced creatinine clearance. Treatment with the MEK inhibitor, CI-1040 abolished phospho- ERK1/2 expression in kidney tissue and prevented phospho-ERK1/2 expression in peripheral lymphocytes during the entire course of therapy. CI-1040 had no impact on creatinine clearance, proteinuria, glomerular and tubular fibrosis, and α-smooth muscle actin expression. However, inhibition of ERK1/2 activation led to significant compensatory upregulation of the MAP kinases, p38 and JNK in kidney tissue. CI-1040 also increased the expression of plasminogen activator inhibitor-1 (PAI-1), a key inhibitor of plasmin-dependent matrix metalloproteinases. Thus inhibition of ERK1/2 activation has no therapeutic effect on kidney fibrosis in SNx possibly due to increased compensatory activation of the p38 and JNK signalling pathways with subsequent upregulation of PAI-1.
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Affiliation(s)
- Faith Hannah Nutter
- Academic Unit of Nephrology, Department of Infection and Immunity, Medical School, University of Sheffield, Sheffield, England
- * E-mail:
| | - John L. Haylor
- Academic Unit of Nephrology, Department of Infection and Immunity, Medical School, University of Sheffield, Sheffield, England
| | - Arif Khwaja
- Sheffield Kidney Institute, Northern General Hospital, Sheffield, England
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240
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Pandey A, Goru SK, Kadakol A, Malek V, Gaikwad AB. Differential regulation of angiotensin converting enzyme 2 and nuclear factor-κB by angiotensin II receptor subtypes in type 2 diabetic kidney. Biochimie 2015; 118:71-81. [PMID: 26271886 DOI: 10.1016/j.biochi.2015.08.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 08/05/2015] [Indexed: 12/22/2022]
Abstract
Angiotensin II (Ang II) acts through Angiotensin Converting Enzyme (ACE)/Ang II type 1 receptor (AT1R) axis to promote renal failure whereas the Ang II type 2 receptor (AT2R)/Angiotensin Converting Enzyme 2 (ACE2)/Ang1-7/Mas axis constitutes the protective arm of Renin Angiotensin System (RAS). Though Ang II has been known to activate the Nuclear Factor-κB (NF-κB) signalling pathway through different receptor subtype(s) in different tissues under various diseases, the subtype orchestrating this stimulation in type 2 diabetic kidney remains elusive. ACE2, a protective monocarboxypeptidase, responsible for conversion of Ang II to Ang1-7, opposes the deleterious effects of RAS pathway but how its expression is altered with blockade of AT1R and AT2R is not yet known. Hence, the present study was conceived to understand the regulation of NF-κB and ACE2 by using specific AT1 and AT2 receptor antagonists in non-genetic model of type 2 diabetic nephropathy. Our results show that the AT1R and AT2R antagonists lead to the repression and activation of NF-κB signalling pathway, respectively which suggests the role of AT1R in NF-κB activation. The blockade of AT2R led to an increase in ACE2 expression, which may be a compensatory response to the drastically increased inflammatory mediators and oxidative stress in the diabetic kidney. To the best of our knowledge, this is the first study showing the differential regulation of NF-κB and ACE2 by Ang II receptor subtypes and thus this study improves our understanding regarding regulation of inflammatory cascade and ACE2 by AT1R and AT2R in type 2 diabetic kidney, which may help in designing novel strategies to combat the disease in future.
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Affiliation(s)
- Anuradha Pandey
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan, 333031, India
| | - Santosh Kumar Goru
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan, 333031, India
| | - Almesh Kadakol
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan, 333031, India
| | - Vajir Malek
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan, 333031, India
| | - Anil Bhanudas Gaikwad
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan, 333031, India.
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241
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Meng XM, Tang PMK, Li J, Lan HY. Macrophage Phenotype in Kidney Injury and Repair. KIDNEY DISEASES 2015; 1:138-46. [PMID: 27536674 DOI: 10.1159/000431214] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 04/15/2015] [Indexed: 12/31/2022]
Abstract
BACKGROUND Glomerular and interstitial macrophage infiltration is a feature for both the acute and chronic kidney diseases. Macrophages have been shown to play a diverse role in kidney injury and repair. Thus, macrophages may be a key cell type in acute and chronic kidney injury and repair. SUMMARY AND KEY MESSAGES During renal inflammation, circulating monocytes are recruited and then become activated and polarized. By adapting to the local microenvironment, macrophages can differentiate into different phenotypes and function as a double-bladed sword in different stages of kidney disease. In general, M1 macrophages play a pathogenic role in boosting inflammatory renal injury, whereas M2 macrophages exert an anti-inflammatory and wound healing (or profibrotic) role during renal repair. In this review, we highlight the phenotypic polarization of macrophages in renal diseases and dissect their distinct functions in renal injury and repair processes, respectively. Moreover, the current understanding of regulatory mechanisms on the phenotypic switch and macrophage-related therapy are also intensively discussed.
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Affiliation(s)
- Xiao-Ming Meng
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Patrick Ming-Kuen Tang
- Department of Medicine and Therapeutics, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - Jun Li
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Hui Yao Lan
- Department of Medicine and Therapeutics, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, SAR, China; Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
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242
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Affiliation(s)
- Madhur P Motwani
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, United Kingdom
| | - Derek W Gilroy
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, United Kingdom.
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243
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Toering TJ, van der Graaf AM, Visser FW, Buikema H, Navis G, Faas MM, Lely AT. Gender differences in response to acute and chronic angiotensin II infusion: a translational approach. Physiol Rep 2015; 3:3/7/e12434. [PMID: 26149279 PMCID: PMC4552520 DOI: 10.14814/phy2.12434] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Women with renal disease progress at a slower rate to end stage renal disease than men. As angiotensin II has both hemodynamic and direct renal effects, we hypothesized that the female protection may result from gender differences in responses to angiotensin II. Therefore, we studied gender differences in response to angiotensin II, during acute (human) and chronic (rats) angiotensin II administration. In young healthy men (n = 18) and women (n = 18) we studied the responses of renal hemodynamics (125I-iothalamate and 131I-Hippuran) and blood pressure to graded angiotensin II infusion (0.3, 1.0, and 3.0 ng/kg/min for 1 h). Men had increased responses of diastolic blood pressure (P = 0.01), mean arterial pressure (P = 0.05), and a more pronounced decrease in effective renal plasma flow (P = 0.009) than women. We measured the changes in proteinuria and blood pressure in response to chronic administration (200 ng/kg/min for 3 weeks) of angiotensin II in rats. Male rats had an increased response of proteinuria compared with females (GEE analysis, P = 0.001). Male, but not female, angiotensin II-treated rats had increased numbers of renal interstitial macrophages compared to sham-treated rats (P < 0.001). In conclusion, gender differences are present in the response to acute and chronic infusion of angiotensin II. Difference in angiotensin II sensitivity could play a role in gender differences in progression of renal disease.
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Affiliation(s)
- Tsjitske J Toering
- Division of Nephrology, Department of Internal Medicine, University of Groningen University Medical Center Groningen, Groningen, The Netherlands
| | - Anne Marijn van der Graaf
- Division of Medical Biology, Department of Pathology and Medical Biology, University of Groningen University Medical Center Groningen, Groningen, The Netherlands
| | - Folkert W Visser
- Division of Nephrology, Department of Internal Medicine, University of Groningen University Medical Center Groningen, Groningen, The Netherlands
| | - Hendrik Buikema
- Department of Clinical Pharmacology, University of Groningen University Medical Center Groningen, Groningen, The Netherlands
| | - Gerjan Navis
- Division of Nephrology, Department of Internal Medicine, University of Groningen University Medical Center Groningen, Groningen, The Netherlands
| | - Marijke M Faas
- Division of Medical Biology, Department of Pathology and Medical Biology, University of Groningen University Medical Center Groningen, Groningen, The Netherlands
| | - A Titia Lely
- Department of Obstetrics & Gynaecology, University of Groningen University Medical Center Groningen, Groningen, The Netherlands
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244
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Baek JH, Zeng R, Weinmann-Menke J, Valerius MT, Wada Y, Ajay AK, Colonna M, Kelley VR. IL-34 mediates acute kidney injury and worsens subsequent chronic kidney disease. J Clin Invest 2015; 125:3198-214. [PMID: 26121749 DOI: 10.1172/jci81166] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 05/14/2015] [Indexed: 12/12/2022] Open
Abstract
Macrophages (Mø) are integral in ischemia/reperfusion injury-incited (I/R-incited) acute kidney injury (AKI) that leads to fibrosis and chronic kidney disease (CKD). IL-34 and CSF-1 share a receptor (c-FMS), and both cytokines mediate Mø survival and proliferation but also have distinct features. CSF-1 is central to kidney repair and destruction. We tested the hypothesis that IL-34-dependent, Mø-mediated mechanisms promote persistent ischemia-incited AKI that worsens subsequent CKD. In renal I/R, the time-related magnitude of Mø-mediated AKI and subsequent CKD were markedly reduced in IL-34-deficient mice compared with controls. IL-34, c-FMS, and a second IL-34 receptor, protein-tyrosine phosphatase ζ (PTP-ζ) were upregulated in the kidney after I/R. IL-34 was generated by tubular epithelial cells (TECs) and promoted Mø-mediated TEC destruction during AKI that worsened subsequent CKD via 2 distinct mechanisms: enhanced intrarenal Mø proliferation and elevated BM myeloid cell proliferation, which increases circulating monocytes that are drawn into the kidney by chemokines. CSF-1 expression in TECs did not compensate for IL-34 deficiency. In patients, kidney transplants subject to I/R expressed IL-34, c-FMS, and PTP-ζ in TECs during AKI that increased with advancing injury. Moreover, IL-34 expression increased, along with more enduring ischemia in donor kidneys. In conclusion, IL-34-dependent, Mø-mediated, CSF-1 nonredundant mechanisms promote persistent ischemia-incited AKI that worsens subsequent CKD.
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245
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Pennathur S, Pasichnyk K, Bahrami NM, Zeng L, Febbraio M, Yamaguchi I, Okamura DM. The macrophage phagocytic receptor CD36 promotes fibrogenic pathways on removal of apoptotic cells during chronic kidney injury. THE AMERICAN JOURNAL OF PATHOLOGY 2015; 185:2232-45. [PMID: 26092500 DOI: 10.1016/j.ajpath.2015.04.016] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 04/04/2015] [Accepted: 04/08/2015] [Indexed: 12/19/2022]
Abstract
The removal of apoptotic cells is an innate function of tissue macrophages; however, its role in disease progression is unclear. The present study was designed to investigate the role of macrophage CD36, a recognized receptor of apoptotic cells and oxidized lipids, in two models of kidney injury: unilateral ureteral obstruction (UUO) and ischemia reperfusion. To differentiate the macrophage CD36-specific effects in vivo, we generated CD36 chimeric mice by bone marrow transplantation and evaluated the two models. Fibrosis severity was substantially decreased after UUO with a corresponding decrease in matrix synthesis in macrophage CD36-deficient mice. Despite a reduction in fibrosis severity, a 56% increase in apoptotic cells was found without an increase in apoptotic effectors. In addition, a substantial reduction was observed in tumor necrosis factor-α and transforming growth factor-β1 mRNA levels and intracellular bioactive oxidized lipid levels in CD36-deficient macrophages. To validate the functional role of macrophage CD36, we performed unilateral ischemia reperfusion, followed by contralateral nephrectomy. Similarly, we found that the severity of fibrosis was reduced by 55% with a corresponding improvement in kidney function by 88% in macrophage CD36-deficient mice. Taken together, these data suggest that macrophage CD36 is a critical regulator of oxidative fibrogenic signaling and that CD36-mediated phagocytosis of apoptotic cells may serve as an important pathway in the progression of fibrosis.
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Affiliation(s)
| | - Katie Pasichnyk
- Seattle Children's Hospital Research Institute, University of Washington, Seattle, Washington
| | - Nadia M Bahrami
- Seattle Children's Hospital Research Institute, University of Washington, Seattle, Washington
| | - Lixia Zeng
- Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
| | - Maria Febbraio
- Department of Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Ikuyo Yamaguchi
- Seattle Children's Hospital Research Institute, University of Washington, Seattle, Washington
| | - Daryl M Okamura
- Seattle Children's Hospital Research Institute, University of Washington, Seattle, Washington.
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246
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Alternatively activated macrophages in the pathogenesis of chronic kidney allograft injury. Pediatr Nephrol 2015; 30:1007-17. [PMID: 25487670 DOI: 10.1007/s00467-014-3023-0] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 11/05/2014] [Accepted: 11/20/2014] [Indexed: 01/09/2023]
Abstract
BACKGROUND Prevention of chronic kidney allograft injury (CAI) is a major goal in improving kidney allograft survival; however, the mechanisms of CAI are not clearly understood. The current study investigated whether alternatively activated M2-type macrophages are involved in the development of CAI. METHODS A retrospective study examined kidney allograft protocol biopsies (at 1 h and at years 1, 5, and 10--a total of 41 biopsies) obtained from 13 children undergoing transplantation between 1991 and 2008 who were diagnosed with CAI: interstitial fibrosis and tubular atrophy (IF/TA) not otherwise specified (IF/TA-NOS). RESULTS Immunostaining identified a significant increase in interstitial fibrosis with accumulation of CD68 + CD163+ M2-type macrophages. CD163+ cells were frequently localized to areas of interstitial fibrosis exhibiting collagen I deposition and accumulation of α-smooth muscle actin (SMA) + myofibroblasts. There was a significant correlation between interstitial CD163+ cells and the parameters of interstitial fibrosis (p < 0.0001), and kidney function (r =-0.82, p < 0.0001). The number of interstitial CD163+ cells at years 1 and 5 also correlated with parameters of interstitial fibrosis at years 5 and 10 respectively. Notably, urine CD163 levels correlated with interstitial CD163+ cells (r = 0.79, p < 0.01) and parameters of interstitial fibrosis (p < 0.0001). However, CD3+ T lymphocytic infiltration did not correlate with macrophage accumulation or fibrosis. In vitro, dexamethasone up-regulated expression of CD163 and cytokines (TGF-β1, FGF-2, CTGF) in human monocyte-derived macrophages, indicating a pro-fibrotic phenotype. CONCLUSIONS Our findings identify a major population of M2-type macrophages in patients with CAI, and suggest that these M2-type macrophages might promote the development of interstitial fibrosis in IF/TA-NOS.
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247
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Anti-fibrotic effect of natural toxin bee venom on animal model of unilateral ureteral obstruction. Toxins (Basel) 2015; 7:1917-28. [PMID: 26035488 PMCID: PMC4488681 DOI: 10.3390/toxins7061917] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 04/27/2015] [Accepted: 05/01/2015] [Indexed: 02/06/2023] Open
Abstract
Progressive renal fibrosis is the final common pathway for all kidney diseases leading to chronic renal failure. Bee venom (BV) has been widely used as a traditional medicine for various diseases. However, the precise mechanism of BV in ameliorating the renal fibrosis is not fully understood. To investigate the therapeutic effects of BV against unilateral ureteral obstruction (UUO)-induced renal fibrosis, BV was given intraperitoneally after ureteral ligation. At seven days after UUO surgery, the kidney tissues were collected for protein analysis and histologic examination. Histological observation revealed that UUO induced a considerable increase in the number of infiltrated inflammatory cells. However, BV treatment markedly reduced these reactions compared with untreated UUO mice. The expression levels of TNF-α and IL-1β were significantly reduced in BV treated mice compared with UUO mice. In addition, treatment with BV significantly inhibited TGF-β1 and fibronectin expression in UUO mice. Moreover, the expression of α-SMA was markedly withdrawn after treatment with BV. These findings suggest that BV attenuates renal fibrosis and reduces inflammatory responses by suppression of multiple growth factor-mediated pro-fibrotic genes. In conclusion, BV may be a useful therapeutic agent for the prevention of fibrosis that characterizes progression of chronic kidney disease.
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248
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Clements M, Gershenovich M, Chaber C, Campos-Rivera J, Du P, Zhang M, Ledbetter S, Zuk A. Differential Ly6C Expression after Renal Ischemia-Reperfusion Identifies Unique Macrophage Populations. J Am Soc Nephrol 2015; 27:159-70. [PMID: 26015452 DOI: 10.1681/asn.2014111138] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 03/27/2015] [Indexed: 12/17/2022] Open
Abstract
Macrophages are a heterogeneous cell type implicated in injury, repair, and fibrosis after AKI, but the macrophage population associated with each phase is unclear. In this study, we used a renal bilateral ischemia-reperfusion injury mouse model to identify unique monocyte/macrophage populations by differential expression of Ly6C in CD11b(+) cells and to define the function of these cells in the pathophysiology of disease on the basis of microarray gene signatures and reduction strategies. Macrophage populations were isolated from kidney homogenates by fluorescence-activated cell sorting for whole genome microarray analysis. The CD11b(+)/Ly6C(high) population associated with the onset of renal injury and increase in proinflammatory cytokines, whereas the CD11b(+)/Ly6C(intermediate) population peaked during kidney repair. The CD11b(+)/Ly6C(low) population emerged with developing renal fibrosis. Principal component and hierarchical cluster analyses identified gene signatures unique to each population. The CD11b(+)/Ly6C(intermediate) population had a distinct phenotype of wound healing, confirmed by results of studies inhibiting the macrophage colony-stimulating factor 1 receptor,whereas the CD11b(+)/Ly6C(low) population had a profibrotic phenotype. All populations, including the CD11b(+)/Ly6C(high) population, carried differential inflammatory signatures. The expression of M2-specific markers was detected in both the CD11b(+)/Ly6C(intermediate) and CD11b(+)/Ly6C(low) populations, suggesting these in vivo populations do not fit into the traditional classifications defined by in vitro systems. Results of this study in a renal ischemia-reperfusion injury model allow phenotype and function to be assigned to CD11b(+)/Ly6C(+) monocyte/macrophage populations in the pathophysiology of disease after AKI.
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Affiliation(s)
| | | | | | | | - Pan Du
- Functional Genomics, Genzyme R&D Center, Genzyme, a Sanofi Company, Framingham, Massachusetts
| | - Mindy Zhang
- Functional Genomics, Genzyme R&D Center, Genzyme, a Sanofi Company, Framingham, Massachusetts
| | | | - Anna Zuk
- Tissue Protection and Repair Unit, Renal Science,
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249
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Rictor/mTORC2 signaling mediates TGFβ1-induced fibroblast activation and kidney fibrosis. Kidney Int 2015; 88:515-27. [PMID: 25970154 PMCID: PMC4558569 DOI: 10.1038/ki.2015.119] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Revised: 02/23/2015] [Accepted: 02/26/2015] [Indexed: 02/06/2023]
Abstract
The mammalian target of rapamycin (mTOR) was recently identified in two structurally distinct multiprotein complexes: mTORC1 and mTORC2. Previously, we found that Rictor/mTORC2 protects against cisplatin-induced acute kidney injury, but the role and mechanisms for Rictor/mTORC2 in TGFβ1-induced fibroblast activation and kidney fibrosis remains unknown. To study this, we initially treated NRK-49F cells with TGFβ1 and found that TGFβ1 could activate Rictor/mTORC2 signaling in cultured cells. Blocking Rictor/mTORC2 signaling with Rictor or Akt1 small interfering RNAs markedly inhibited TGFβ1-induced fibronection and α-smooth muscle actin expression. Ensuing western blotting or immunostaining results showed that Rictor/mTORC2 signaling was activated in kidney interstitial myofibroblasts from mice with unilateral ureteral obstruction. Next, a mouse model with fibroblast-specific deletion of Rictor was generated. These knockout mice were normal at birth and had no obvious kidney dysfunction or kidney morphological abnormality within 2 months of birth. Compared with control littermates, the kidneys of Rictor knockout mice developed less interstitial extracellular matrix deposition and inflammatory cell infiltration at 1 or 2 weeks after ureteral obstruction. Thus our study suggests that Rictor/mTORC2 signaling activation mediates TGFβ1-induced fibroblast activation and contributes to the development of kidney fibrosis. This may provide a therapeutic target for chronic kidney diseases.
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250
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Sogkas G, Stegner D, Syed SN, Vögtle T, Rau E, Gewecke B, Schmidt RE, Nieswandt B, Gessner JE. Cooperative and alternate functions for STIM1 and STIM2 in macrophage activation and in the context of inflammation. IMMUNITY INFLAMMATION AND DISEASE 2015; 3:154-70. [PMID: 26417434 PMCID: PMC4578517 DOI: 10.1002/iid3.56] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 03/05/2015] [Accepted: 03/06/2015] [Indexed: 12/12/2022]
Abstract
Calcium (Ca(2+)) signaling in immune cells, including macrophages, controls a wide range of effector functions that are critical for host defense and contribute to inflammation and autoimmune diseases. However, receptor-mediated Ca(2+) responses consist of complex mechanisms that make it difficult to identify the pathogenesis and develop therapy. Previous studies have revealed the importance of the Ca(2+) sensor STIM1 and store-operated Ca(2+)-entry (SOCE) for Fcγ-receptor activation and IgG-induced inflammation. Here, we identify the closely related STIM2 as mediator of cell migration and cytokine production downstream of GPCR and TLR4 activation in macrophages and show that mice lacking STIM2 are partially resistant to inflammatory responses in peritonitis and LPS-induced inflammation. Interestingly, STIM2 modulates the migratory behavior of macrophages independent from STIM1 and without a strict requirement for Ca(2+) influx. While STIM2 also contributes in part to FcγR activation, the C5a-induced amplification of IgG-mediated phagocytosis is mainly dependent on STIM1. Blockade of STIM-related functions limits mortality in experimental models of AIHA and LPS-sepsis in normal mice. These results suggest benefits of Ca(2+)-inhibition for suppression of exacerbated immune reactions and illustrate the significance of alternate functions of STIM proteins in macrophage activation and in the context of innate immune inflammation.
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Affiliation(s)
- Georgios Sogkas
- Clinical Department of Immunology and Rheumatology, Hannover Medical School Germany
| | - David Stegner
- Chair of Experimental Biomedicine University Hospital and Rudolf Virchow Center DFG Research Center for Experimental Biomedicine, University of Würzburg Würzburg, Germany
| | - Shahzad N Syed
- Clinical Department of Immunology and Rheumatology, Hannover Medical School Germany
| | - Timo Vögtle
- Chair of Experimental Biomedicine University Hospital and Rudolf Virchow Center DFG Research Center for Experimental Biomedicine, University of Würzburg Würzburg, Germany
| | - Eduard Rau
- Clinical Department of Immunology and Rheumatology, Hannover Medical School Germany
| | - Britta Gewecke
- Clinical Department of Immunology and Rheumatology, Hannover Medical School Germany
| | - Reinhold E Schmidt
- Clinical Department of Immunology and Rheumatology, Hannover Medical School Germany
| | - Bernhard Nieswandt
- Chair of Experimental Biomedicine University Hospital and Rudolf Virchow Center DFG Research Center for Experimental Biomedicine, University of Würzburg Würzburg, Germany
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