1
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Yung S, Chan TM. Endothelial cell activation and glycocalyx shedding - potential as biomarkers in patients with lupus nephritis. Front Immunol 2023; 14:1251876. [PMID: 37854589 PMCID: PMC10579905 DOI: 10.3389/fimmu.2023.1251876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Accepted: 09/18/2023] [Indexed: 10/20/2023] Open
Abstract
Lupus nephritis (LN) is a common and severe manifestation of systemic lupus erythematosus and an important cause of acute and chronic kidney injury. Early diagnosis of LN and preventing relapses are key to preserving renal reserve. However, due to the complexity and heterogeneity of the disease, clinical management remains challenging. Kidney biopsy remains the gold standard for confirming the diagnosis of LN and subsequent assessment of kidney histopathology, but it is invasive and cannot be repeated frequently. Current clinical indicators of kidney function such as proteinuria and serum creatinine level are non-specific and do not accurately reflect histopathological changes, while anti-dsDNA antibody and C3 levels reflect immunological status but not kidney injury. Identification of novel and specific biomarkers for LN is prerequisite to improve management. Renal function deterioration is associated with changes in the endothelial glycocalyx, a delicate gel-like layer located at the interface between the endothelium and bloodstream. Inflammation induces endothelial cell activation and shedding of glycocalyx constituents into the circulation. This review discusses the potential role of soluble glycocalyx components as biomarkers of active LN, especially in patients in whom conventional serological and biochemical markers do not appear helpful.
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Affiliation(s)
- Susan Yung
- Department of Medicine, School of Clinical Medicine, The University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Tak Mao Chan
- Department of Medicine, School of Clinical Medicine, The University of Hong Kong, Hong Kong, Hong Kong SAR, China
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2
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Tan Z, Hall P, Costin A, Crawford SA, Ramm G, Wong CHY, Kitching AR, Hickey MJ. Removal of the endothelial surface layer via hyaluronidase does not modulate monocyte and neutrophil interactions with the glomerular endothelium. Microcirculation 2023; 30:e12823. [PMID: 37494581 PMCID: PMC10909409 DOI: 10.1111/micc.12823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/13/2023] [Accepted: 07/14/2023] [Indexed: 07/28/2023]
Abstract
OBJECTIVE The endothelial surface layer (ESL), a layer of macromolecules on the surface of endothelial cells, can both impede and facilitate leukocyte recruitment. However, its role in monocyte and neutrophil recruitment in glomerular capillaries is unknown. METHODS We used multiphoton intravital microscopy to examine monocyte and neutrophil behavior in the glomerulus following ESL disruption with hyaluronidase. RESULTS Constitutive retention and migration of monocytes and neutrophils within the glomerular microvasculature was unaltered by hyaluronidase. Consistent with this, inhibition of the hyaluronan-binding molecule CD44 also failed to modulate glomerular trafficking of these immune cells. To investigate the contribution of the ESL during acute inflammation, we induced glomerulonephritis via in situ immune complex deposition. This resulted in increases in glomerular retention of monocytes and neutrophils but did not induce marked reduction in the glomerular ESL. Furthermore, hyaluronidase treatment did not modify the prolonged retention of monocytes and neutrophils in the acutely inflamed glomerular microvasculature. CONCLUSIONS These observations indicate that, despite evidence that the ESL has the capacity to inhibit leukocyte-endothelial cell interactions while also containing adhesive ligands for immune cells, neither of these functions modulate trafficking of monocytes and neutrophils in steady-state or acutely-inflamed glomeruli.
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Affiliation(s)
- ZheHao Tan
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
| | - Pam Hall
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
| | - Adam Costin
- Monash Ramaciotti Centre for Cryo‐Electron MicroscopyMonash UniversityClaytonVictoriaAustralia
| | - Simon A. Crawford
- Monash Ramaciotti Centre for Cryo‐Electron MicroscopyMonash UniversityClaytonVictoriaAustralia
| | - Georg Ramm
- Monash Ramaciotti Centre for Cryo‐Electron MicroscopyMonash UniversityClaytonVictoriaAustralia
| | - Connie H. Y. Wong
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
| | - A. Richard Kitching
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
- Department of NephrologyMonash Medical CentreClaytonVictoriaAustralia
- Department of Pediatric NephrologyMonash Medical CentreClaytonVictoriaAustralia
| | - Michael J. Hickey
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
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3
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Kadoya H, Hirano A, Umeno R, Kajimoto E, Iwakura T, Kondo M, Wada Y, Kidokoro K, Kishi S, Nagasu H, Sasaki T, Taniguchi S, Takahashi M, Kashihara N. Activation of the inflammasome drives peritoneal deterioration in a mouse model of peritoneal fibrosis. FASEB J 2023; 37:e23129. [PMID: 37606578 DOI: 10.1096/fj.202201777rrr] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 07/10/2023] [Accepted: 07/25/2023] [Indexed: 08/23/2023]
Abstract
During peritoneal dialysis (PD), the peritoneum is exposed to a bioincompatible dialysate, deteriorating the tissue and limiting the long-term effectiveness of PD. Peritoneal fibrosis is triggered by chronic inflammation induced by a variety of stimuli, including peritonitis. Exposure to PD fluid alters peritoneal macrophages phenotype. Inflammasome activation triggers chronic inflammation. First, it was determined whether inflammasome activation causes peritoneal deterioration. In the in vivo experiments, the increased expression of the inflammasome components, caspase-1 activity, and concomitant overproduction of IL-1β and IL-18 were observed in a mouse model of peritoneal fibrosis. ASC-positive and F4/80-positive cells colocalized in the subperitoneal mesothelial cell layer. These macrophages expressed high CD44 levels indicating that the CD44-positive macrophages contribute to developing peritoneal deterioration. Furthermore, intravital imaging of the peritoneal microvasculature demonstrated that the circulating CD44-positive leukocytes may contribute to peritoneal fibrosis. Bone marrow transplantation in ASC-deficient mice suppressed inflammasome activation, thereby attenuating peritoneal fibrosis in a high glucose-based PD solution-injected mouse model. Our results suggest inflammasome activation in CD44-positive macrophages may be involved in developing peritoneal fibrosis. The inflammasome-derived pro-inflammatory cytokines might therefore serve as new biomarkers for developing encapsulating peritoneal sclerosis.
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Affiliation(s)
- Hiroyuki Kadoya
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Akira Hirano
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Reina Umeno
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Eriko Kajimoto
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Tsukasa Iwakura
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Megumi Kondo
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Yoshihisa Wada
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Kengo Kidokoro
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Seiji Kishi
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Hajime Nagasu
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Tamaki Sasaki
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
| | - Shun'ichiro Taniguchi
- Advanced Cancer Medicine for Gynecologic Cancer, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Masafumi Takahashi
- Division of Inflammation Research, Center for Molecular Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Naoki Kashihara
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Japan
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4
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Bordoni L, Kristensen AM, Sardella D, Kidmose H, Pohl L, Krag SRP, Schiessl IM. Longitudinal tracking of acute kidney injury reveals injury propagation along the nephron. Nat Commun 2023; 14:4407. [PMID: 37479698 PMCID: PMC10362041 DOI: 10.1038/s41467-023-40037-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 07/10/2023] [Indexed: 07/23/2023] Open
Abstract
Acute kidney injury (AKI) is an important risk factor for chronic kidney disease (CKD), but the underlying mechanisms of failed tubule repair and AKI-CKD transition are incompletely understood. In this study, we aimed for dynamic tracking of tubule injury and remodeling to understand if focal injury upon AKI may spread over time. Here, we present a model of AKI, in which we rendered only half of the kidney ischemic. Using serial intravital 2-photon microscopy and genetic identification of cycling cells, we tracked dynamic tissue remodeling in post- and non-ischemic kidney regions simultaneously and over 3 weeks. Spatial and temporal analysis of cycling cells relative to initial necrotic cell death demonstrated pronounced injury propagation and expansion into non-necrotic tissue regions, which predicted tubule atrophy with epithelial VCAM1 expression. In summary, our longitudinal analyses of tubule injury, remodeling, and fate provide important insights into AKI pathology.
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Affiliation(s)
- Luca Bordoni
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- GliaLab and Letten Centre, Division of Anatomy, Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | | | - Donato Sardella
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Hanne Kidmose
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Layla Pohl
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
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5
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Abdullah S, Ghio M, Cotton-Betteridge A, Vinjamuri A, Drury R, Packer J, Aras O, Friedman J, Karim M, Engelhardt D, Kosowski E, Duong K, Shaheen F, McGrew PR, Harris CT, Reily R, Sammarco M, Chandra PK, Pociask D, Kolls J, Katakam PV, Smith A, Taghavi S, Duchesne J, Jackson-Weaver O. Succinate metabolism and membrane reorganization drives the endotheliopathy and coagulopathy of traumatic hemorrhage. SCIENCE ADVANCES 2023; 9:eadf6600. [PMID: 37315138 PMCID: PMC10266735 DOI: 10.1126/sciadv.adf6600] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 05/10/2023] [Indexed: 06/16/2023]
Abstract
Acute hemorrhage commonly leads to coagulopathy and organ dysfunction or failure. Recent evidence suggests that damage to the endothelial glycocalyx contributes to these adverse outcomes. The physiological events mediating acute glycocalyx shedding are undefined, however. Here, we show that succinate accumulation within endothelial cells drives glycocalyx degradation through a membrane reorganization-mediated mechanism. We investigated this mechanism in a cultured endothelial cell hypoxia-reoxygenation model, in a rat model of hemorrhage, and in trauma patient plasma samples. We found that succinate metabolism by succinate dehydrogenase mediates glycocalyx damage through lipid oxidation and phospholipase A2-mediated membrane reorganization, promoting the interaction of matrix metalloproteinase 24 (MMP24) and MMP25 with glycocalyx constituents. In a rat hemorrhage model, inhibiting succinate metabolism or membrane reorganization prevented glycocalyx damage and coagulopathy. In patients with trauma, succinate levels were associated with glycocalyx damage and the development of coagulopathy, and the interaction of MMP24 and syndecan-1 was elevated compared to healthy controls.
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Affiliation(s)
- Sarah Abdullah
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
| | - Michael Ghio
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
| | | | | | - Robert Drury
- Tulane University School of Medicine, New Orleans, LA, USA
| | - Jacob Packer
- Tulane University School of Medicine, New Orleans, LA, USA
| | - Oguz Aras
- Tulane University School of Medicine, New Orleans, LA, USA
| | - Jessica Friedman
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
| | - Mardeen Karim
- Tulane University School of Medicine, New Orleans, LA, USA
| | | | | | - Kelby Duong
- Tulane University School of Medicine, New Orleans, LA, USA
| | - Farhana Shaheen
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
| | - Patrick R. McGrew
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
- University Medical Center, New Orleans, LA, USA
| | - Charles T. Harris
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
- University Medical Center, New Orleans, LA, USA
| | - Robert Reily
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
- University Medical Center, New Orleans, LA, USA
| | - Mimi Sammarco
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
| | - Partha K. Chandra
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, LA, USA
| | - Derek Pociask
- Tulane University School of Medicine, Center for Translational Research in Infection and Inflammation, New Orleans, LA, USA
| | - Jay Kolls
- Tulane University School of Medicine, Center for Translational Research in Infection and Inflammation, New Orleans, LA, USA
| | - Prasad V. Katakam
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, LA, USA
| | - Alison Smith
- Louisiana State University Health Sciences Center, New Orleans, LA, USA
- University Medical Center, New Orleans, LA, USA
| | - Sharven Taghavi
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
- University Medical Center, New Orleans, LA, USA
| | - Juan Duchesne
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
- University Medical Center, New Orleans, LA, USA
| | - Olan Jackson-Weaver
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
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6
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The effects of female sexual hormones on the endothelial glycocalyx. CURRENT TOPICS IN MEMBRANES 2023; 91:89-137. [PMID: 37080682 DOI: 10.1016/bs.ctm.2023.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
The glycocalyx is a layer composed of carbohydrate side chains bound to core proteins that lines the vascular endothelium. The integrity of the glycocalyx is essential for endothelial cells' performance and vascular homeostasis. The neuroendocrine and immune systems influence the composition, maintenance, activity and degradation of the endothelial glycocalyx. The female organism has unique characteristics, and estrogen and progesterone, the main female hormones are essential to the development and physiology of the reproductive system and to the ability to develop a fetus. Female sex hormones also exert a wide variety of effects on other organs, including the vascular endothelium. They upregulate nitric oxide synthase expression and activity, decrease oxidative stress, increase vasodilation, and protect from vascular injury. This review will discuss how female hormones and pregnancy, which prompts to high levels of estrogen and progesterone, modulate the endothelial glycocalyx. Diseases prevalent in women that alter the glycocalyx, and therapeutic forms to prevent glycocalyx degradation and potential treatments that can reconstitute its structure and function will also be discussed.
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7
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Takasu M, Kadoya H, Yamanouchi Y, Nojima Y, Yamamoto T, Itano S, Nakata M, Sasaki T, Kashihara N. A case of pleuroperitoneal communication during long-term steroid therapy for dermatomyositis. ARCH ESP UROL 2022; 42:434-436. [PMID: 35318868 DOI: 10.1177/08968608221088441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Masanobu Takasu
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Hiroyuki Kadoya
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Yu Yamanouchi
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Yuji Nojima
- Department of General Thoracic Surgery, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Toshiya Yamamoto
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Seiji Itano
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Masao Nakata
- Department of General Thoracic Surgery, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Tamaki Sasaki
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Naoki Kashihara
- Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan
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8
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Oates JC, Russell DL, Van Beusecum JP. Endothelial cells: potential novel regulators of renal inflammation. Am J Physiol Renal Physiol 2022; 322:F309-F321. [PMID: 35129369 PMCID: PMC8897017 DOI: 10.1152/ajprenal.00371.2021] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Substantial evidence has supported the role of endothelial cell (EC) activation and dysfunction in the development of hypertension, chronic kidney disease (CKD), and lupus nephritis (LN). In both humans and experimental models of hypertension, CKD, and LN, ECs become activated and release potent mediators of inflammation including cytokines, chemokines, and reactive oxygen species that cause EC dysfunction, tissue damage, and fibrosis. Factors that activate the endothelium include inflammatory cytokines, mechanical stretch, and pathological shear stress. These signals can activate the endothelium to promote upregulation of adhesion molecules, such as intercellular adhesion molecule-1 and vascular cell adhesion molecule-1, which promote leukocyte adhesion and migration to the activated endothelium. More importantly, it is now recognized that some of these signals may in turn promote endothelial antigen presentation through major histocompatibility complex II. In this review, we will consider in-depth mechanisms of endothelial activation and the novel mechanism of endothelial antigen presentation. Moreover, we will discuss these proinflammatory events in renal pathologies and consider possible new therapeutic approaches to limit the untoward effects of endothelial inflammation in hypertension, CKD, and LN.
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Affiliation(s)
- Jim C. Oates
- 1Ralph H. Johnson Veteran Affairs Medical Center, Charleston, South Carolina,2Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Dayvia L. Russell
- 2Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Justin P. Van Beusecum
- 1Ralph H. Johnson Veteran Affairs Medical Center, Charleston, South Carolina,3Division of Nephrology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
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9
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Kitching AR, Hickey MJ. Immune cell behaviour and dynamics in the kidney - insights from in vivo imaging. Nat Rev Nephrol 2022; 18:22-37. [PMID: 34556836 DOI: 10.1038/s41581-021-00481-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/11/2021] [Indexed: 02/08/2023]
Abstract
The actions of immune cells within the kidney are of fundamental importance in kidney homeostasis and disease. In disease settings such as acute kidney injury, anti-neutrophil cytoplasmic antibody-associated vasculitis, lupus nephritis and renal transplant rejection, immune cells resident within the kidney and those recruited from the circulation propagate inflammatory responses with deleterious effects on the kidney. As in most forms of inflammation, intravital imaging - particularly two-photon microscopy - has been critical to our understanding of immune cell responses in the renal microvasculature and interstitium, enabling visualization of immune cell dynamics over time rather than statically. These studies have demonstrated differences in the recruitment and function of these cells from those in more conventional vascular beds, and provided a wealth of information on the actions of blood-borne immune cells such as neutrophils, monocytes and T cells, as well as kidney-resident mononuclear phagocytes, in a range of diseases affecting different kidney compartments. In particular, in vivo imaging has furthered our understanding of leukocyte function within the glomerulus in acute glomerulonephritis, and in the tubulointerstitium and interstitial microvasculature during acute kidney injury and following transplantation, revealing mechanisms of immune surveillance, antigen presentation and inflammation in the kidney.
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Affiliation(s)
- A Richard Kitching
- Centre for Inflammatory Diseases, Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia. .,Departments of Nephrology and Paediatric Nephrology, Monash Medical Centre, Clayton, Victoria, Australia.
| | - Michael J Hickey
- Centre for Inflammatory Diseases, Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia
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10
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Ballermann BJ, Nyström J, Haraldsson B. The Glomerular Endothelium Restricts Albumin Filtration. Front Med (Lausanne) 2021; 8:766689. [PMID: 34912827 PMCID: PMC8667033 DOI: 10.3389/fmed.2021.766689] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 11/05/2021] [Indexed: 12/29/2022] Open
Abstract
Inflammatory activation and/or dysfunction of the glomerular endothelium triggers proteinuria in many systemic and localized vascular disorders. Among them are the thrombotic microangiopathies, many forms of glomerulonephritis, and acute inflammatory episodes like sepsis and COVID-19 illness. Another example is the chronic endothelial dysfunction that develops in cardiovascular disease and in metabolic disorders like diabetes. While the glomerular endothelium is a porous sieve that filters prodigious amounts of water and small solutes, it also bars the bulk of albumin and large plasma proteins from passing into the glomerular filtrate. This endothelial barrier function is ascribed predominantly to the endothelial glycocalyx with its endothelial surface layer, that together form a relatively thick, mucinous coat composed of glycosaminoglycans, proteoglycans, glycolipids, sialomucins and other glycoproteins, as well as secreted and circulating proteins. The glycocalyx/endothelial surface layer not only covers the glomerular endothelium; it extends into the endothelial fenestrae. Some glycocalyx components span or are attached to the apical endothelial cell plasma membrane and form the formal glycocalyx. Other components, including small proteoglycans and circulating proteins like albumin and orosomucoid, form the endothelial surface layer and are bound to the glycocalyx due to weak intermolecular interactions. Indeed, bound plasma albumin is a major constituent of the endothelial surface layer and contributes to its barrier function. A role for glomerular endothelial cells in the barrier of the glomerular capillary wall to protein filtration has been demonstrated by many elegant studies. However, it can only be fully understood in the context of other components, including the glomerular basement membrane, the podocytes and reabsorption of proteins by tubule epithelial cells. Discovery of the precise mechanisms that lead to glycocalyx/endothelial surface layer disruption within glomerular capillaries will hopefully lead to pharmacological interventions that specifically target this important structure.
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Affiliation(s)
| | - Jenny Nyström
- Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Börje Haraldsson
- Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
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11
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Gyarmati G, Shroff UN, Izuhara A, Hou X, Da Sacco S, Sedrakyan S, Lemley KV, Amann K, Perin L, Peti-Peterdi J. Intravital imaging reveals glomerular capillary distension and endothelial and immune cell activation early in Alport syndrome. JCI Insight 2021; 7:152676. [PMID: 34793332 PMCID: PMC8765042 DOI: 10.1172/jci.insight.152676] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 11/17/2021] [Indexed: 11/17/2022] Open
Abstract
Alport syndrome (AS) is a genetic disorder caused by mutations in type IV collagen that lead to defective glomerular basement membrane, glomerular filtration barrier (GFB) damage, and progressive chronic kidney disease. While the genetic basis of AS is well known, the molecular and cellular mechanistic details of disease pathogenesis have been elusive, hindering the development of mechanism-based therapies. Here, we performed intravital multiphoton imaging of the local kidney tissue microenvironment in a X-linked AS mouse model to directly visualize the major drivers of AS pathology. Severely distended glomerular capillaries and aneurysms were found accompanied by numerous microthrombi, increased glomerular endothelial surface layer (glycocalyx) and immune cell homing, GFB albumin leakage, glomerulosclerosis, and interstitial fibrosis by 5 months of age, with an intermediate phenotype at 2 months. Renal histology in mouse or patient tissues largely failed to detect capillary aberrations. Treatment of AS mice with hyaluronidase or the ACE inhibitor enalapril reduced the excess glomerular endothelial glycocalyx and blocked immune cell homing and GFB albumin leakage. This study identified central roles of glomerular mechanical forces and endothelial and immune cell activation early in AS, which could be therapeutically targeted to reduce mechanical strain and local tissue inflammation and improve kidney function.
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Affiliation(s)
- Georgina Gyarmati
- Department of Physiology and Neuroscience, University of Southern California, Los Angeles, United States of America
| | - Urvi Nikhil Shroff
- Department of Physiology and Neuroscience, University of Southern California, Los Angeles, United States of America
| | - Audrey Izuhara
- Department of Physiology and Neuroscience, University of Southern California, Los Angeles, United States of America
| | - Xiaogang Hou
- Division of Urology, Children's Hospital Los Angeles, Los Angeles, United States of America
| | - Stefano Da Sacco
- Division of Urology, Children's Hospital Los Angeles, Los Angeles, United States of America
| | - Sargis Sedrakyan
- Division of Urology, Children's Hospital Los Angeles, Los Angeles, United States of America
| | - Kevin V Lemley
- Department of Pediatics, Children's Hospital Los Angeles, Los angeles, United States of America
| | - Kerstin Amann
- Department of Nephropathology, Friedrich Alexander University, Erlangen, Germany
| | - Laura Perin
- Division of Urology, Children's Hospital Los Angeles, Los Angeles, United States of America
| | - János Peti-Peterdi
- Department of Physiology and Neuroscience, University of Southern California, Los Angeles, United States of America
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12
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Gyarmati G, Jacob CO, Peti-Peterdi J. New Endothelial Mechanisms in Glomerular (Patho)biology and Proteinuria Development Captured by Intravital Multiphoton Imaging. Front Med (Lausanne) 2021; 8:765356. [PMID: 34722598 PMCID: PMC8548465 DOI: 10.3389/fmed.2021.765356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 09/17/2021] [Indexed: 11/23/2022] Open
Abstract
In the past two decades, intravital imaging using multiphoton microscopy has provided numerous new visual and mechanistic insights into glomerular biology and disease processes including the function of glomerular endothelial cells (GEnC), podocytes, and the development of proteinuria. Although glomerular endothelial injury is known to precede podocyte damage in several renal diseases, the primary role of GEnCs in proteinuria development received much less attention compared to the vast field of podocyte pathobiology. Consequently, our knowledge of GEnC mechanisms in glomerular diseases is still emerging. This review highlights new visual clues on molecular and cellular mechanisms of GEnCs and their crosstalk with podocytes and immune cells that were acquired recently by the application of multiphoton imaging of the intact glomerular microenvironment in various proteinuric disease models. New mechanisms of glomerular tissue remodeling and regeneration are discussed based on results of tracking the fate and function of individual GEnCs using serial intravital multiphoton imaging over several days and weeks. The three main topics of this review include (i) the role of endothelial injury and microthrombi in podocyte detachment and albumin leakage via hemodynamic and mechanical forces, (ii) the alterations of the endothelial surface layer (glycocalyx) and its interactions with circulating immune cells in lupus nephritis, and (iii) the structural and functional remodeling and regeneration of GEnCs in hypertension, diabetes, and other experimental injury conditions. By the comprehensive visual portrayal of GEnCs and the many other contributing glomerular cell types, this review emphasizes the complexity of pathogenic mechanisms that result in proteinuria development.
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Affiliation(s)
- Georgina Gyarmati
- Departments of Physiology and Neuroscience, and Medicine, Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA, United States
| | - Chaim O Jacob
- Division of Rheumatology and Immunology, Department of Medicine, University of Southern California, Los Angeles, CA, United States
| | - János Peti-Peterdi
- Departments of Physiology and Neuroscience, and Medicine, Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA, United States
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Desposito D, Schiessl IM, Gyarmati G, Riquier-Brison A, Izuhara AK, Kadoya H, Der B, Shroff UN, Hong YK, Peti-Peterdi J. Serial intravital imaging captures dynamic and functional endothelial remodeling with single-cell resolution. JCI Insight 2021; 6:123392. [PMID: 33848265 PMCID: PMC8262275 DOI: 10.1172/jci.insight.123392] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 04/12/2021] [Indexed: 01/01/2023] Open
Abstract
Endothelial cells are important in the maintenance of healthy blood vessels and in the development of vascular diseases. However, the origin and dynamics of endothelial precursors and remodeling at the single-cell level have been difficult to study in vivo owing to technical limitations. Therefore, we aimed to develop a direct visual approach to track the fate and function of single endothelial cells over several days and weeks in the same vascular bed in vivo using multiphoton microscopy (MPM) of transgenic Cdh5-Confetti mice and the kidney glomerulus as a model. Individual cells of the vascular endothelial lineage were identified and tracked owing to their unique color combination, based on the random expression of cyan/green/yellow/red fluorescent proteins. Experimental hypertension, hyperglycemia, and laser-induced endothelial cell ablation rapidly increased the number of new glomerular endothelial cells that appeared in clusters of the same color, suggesting clonal cell remodeling by local precursors at the vascular pole. Furthermore, intravital MPM allowed the detection of distinct structural and functional alterations of proliferating endothelial cells. No circulating Cdh5-Confetti+ cells were found in the renal cortex. Moreover, the heart, lung, and kidneys showed more significant clonal endothelial cell expansion compared with the brain, pancreas, liver, and spleen. In summary, we have demonstrated that serial MPM of Cdh5-Confetti mice in vivo is a powerful technical advance to study endothelial remodeling and repair in the kidney and other organs under physiological and disease conditions.
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Affiliation(s)
- Dorinne Desposito
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Ina Maria Schiessl
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Georgina Gyarmati
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Anne Riquier-Brison
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Audrey K Izuhara
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Hiroyuki Kadoya
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Balint Der
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Urvi Nikhil Shroff
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
| | - Young-Kwon Hong
- Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Janos Peti-Peterdi
- Department of Physiology and Neuroscience, Zilkha Neurogenetic Institute, and
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Ding X, Ren Y, He X. IFN-I Mediates Lupus Nephritis From the Beginning to Renal Fibrosis. Front Immunol 2021; 12:676082. [PMID: 33959133 PMCID: PMC8093624 DOI: 10.3389/fimmu.2021.676082] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 04/06/2021] [Indexed: 12/13/2022] Open
Abstract
Lupus nephritis (LN) is a common complication of systemic lupus erythematosus (SLE) and a major risk factor for morbidity and mortality. The abundant cell-free nucleic (DNA/RNA) in SLE patients, especially dsDNA, is a key substance in the pathogenesis of SLE and LN. The deposition of DNA/RNA-immune complexes (DNA/RNA-ICs) in the glomerulus causes a series of inflammatory reactions that lead to resident renal cell disturbance and eventually renal fibrosis. Cell-free DNA/RNA is the most effective inducer of type I interferons (IFN-I). Resident renal cells (rather than infiltrating immune cells) are the main source of IFN-I in the kidney. IFN-I in turn damages resident renal cells. Not only are resident renal cells victims, but also participants in this immunity war. However, the mechanism for generation of IFN-I in resident renal cells and the pathological mechanism of IFN-I promoting renal fibrosis have not been fully elucidated. This paper reviews the latest epidemiology of LN and its development process, discusses the mechanism for generation of IFN-I in resident renal cells and the role of IFN-I in the pathogenesis of LN, and may open a new perspective for the treatment of LN.
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Affiliation(s)
- Xuewei Ding
- Institute of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, China.,Laboratory of Pediatric Nephrology, Institute of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yi Ren
- Institute of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, China.,Laboratory of Pediatric Nephrology, Institute of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, China.,Pediatric Internal Medicine Department, Haikou Maternal and Child Health Hospital, Haikou, China
| | - Xiaojie He
- Institute of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, China.,Laboratory of Pediatric Nephrology, Institute of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, China
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Hemorrhagic Shock and Resuscitation Causes Glycocalyx Shedding and Endothelial Oxidative Stress Preferentially in the Lung and Intestinal Vasculature. Shock 2021; 56:803-812. [PMID: 34259440 DOI: 10.1097/shk.0000000000001764] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
INTRODUCTION Hemorrhagic shock has recently been shown to cause shedding of a carbohydrate surface layer of endothelial cells known as the glycocalyx. This shedding of the glycocalyx is thought to be a mediator of the coagulopathy seen in trauma patients. Clinical studies have demonstrated increases in shed glycocalyx in the blood after trauma, and animal studies have measured glycocalyx disruption in blood vessels in the lung, skeletal muscle, and mesentery. However, no study has measured glycocalyx disruption across a wide range of vascular beds to quantify the primary locations of this shedding. METHODS In the present study, we used a rat model of hemorrhagic shock and resuscitation to more comprehensively assess glycocalyx disruption across a range of organs. Glycocalyx disruption was assessed by fluorescent-labelled wheat germ agglutinin or syndecan-1 antibody staining in flash frozen tissue. RESULTS We found that our model did elicit glycocalyx shedding, as assessed by an increase in plasma syndecan-1 levels. In tissue sections, we found that the greatest glycocalyx disruption occurred in vessels in the lung and intestine. Shedding to a lesser extent was observed in vessels of the brain, heart, and skeletal muscle. Liver vessel glycocalyx was unaffected, and kidney vessels, including the glomerular capillaries, displayed an increase in glycocalyx. We also measured reactive oxygen species (ROS) in the endothelial cells from these organs, and found that the greatest increase in ROS occurred in the two beds with the greatest glycocalyx shedding, the lungs and intestine. We also detected fibrin deposition in lung vessels following hemorrhage-resuscitation. CONCLUSIONS We conclude that the endothelium in the lungs and intestine are particularly susceptible to the oxidative stress of hemorrhage-resuscitation, as well as the resulting glycocalyx disruption. Thus these two vessel beds may be important drivers of coagulopathy in trauma patients.
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Clarke J. The glycocalyx presents a sweet new target in lupus nephritis. Nat Rev Rheumatol 2020; 16:604. [PMID: 32968224 DOI: 10.1038/s41584-020-00516-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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