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Jiang L, Hu X, Feng Y, Wang Z, Tang H, Lin Q, Shen Y, Zhu Y, Xu Q, Li X. Reduction of renal interstitial fibrosis by targeting Tie2 in vascular endothelial cells. Pediatr Res 2024; 95:959-965. [PMID: 38012310 PMCID: PMC10920200 DOI: 10.1038/s41390-023-02893-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 10/08/2023] [Accepted: 10/30/2023] [Indexed: 11/29/2023]
Abstract
BACKGROUND Tie2, a functional angiopoietin receptor, is expressed in vascular endothelial cells and plays an important role in angiogenesis and vascular stability. This study aimed to evaluate the effects of an agonistic Tie2 signal on renal interstitial fibrosis (RIF) and elucidate the underlying mechanisms. METHODS We established an in vivo mouse model of folic acid-induced nephropathy (FAN) and an in vitro model of lipopolysaccharide-stimulated endothelial cell injury, then an agonistic Tie2 monoclonal antibody (Tie2 mAb) was used to intervent these processes. The degree of tubulointerstitial lesions and related molecular mechanisms were determined by histological assessment, immunohistochemistry, western blotting, and qPCR. RESULTS Tie2 mAb attenuated RIF and reduced the level of fibroblast-specific protein 1 (FSP1). Further, it suppressed vascular cell adhesion molecule-1 (VCAM-1) and increased CD31 density in FAN. In the in vitro model, Tie2 mAb was found to decrease the expression of VCAM-1, Bax, and α-smooth muscle actin (α-SMA). CONCLUSIONS The present findings indicate that the agonistic Tie2 mAb exerted vascular protective effects and ameliorated RIF via inhibition of vascular inflammation, apoptosis, and fibrosis. Therefore, Tie2 may be a potential target for the treatment of this disease. IMPACT This is the first report to confirm that an agonistic Tie2 monoclonal antibody can reduce renal interstitial fibrosis in folic acid-induced nephropathy in mice. This mechanism possibly involves vascular protective effects brought about by inhibition of vascular inflammation, apoptosis and fibrosis. Our data show that Tie2 signal may be a novel, endothelium-specific target for the treatment of tubulointerstitial fibrosis.
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Affiliation(s)
- Lu Jiang
- Department of Nephrology and Immunology, Children's Hospital of Soochow University, Suzhou, 215003, China
| | - Xiaohan Hu
- Institute of Pediatrics, Children's Hospital of Soochow University, Suzhou, 215003, China
| | - Yajun Feng
- Department of Pediatrics, Jiangyin People's Hospital, Jiangyin, 214400, China
| | - Zhen Wang
- Department of Pediatrics, Zibo Maternal and Child Health Care Hospital, Zibo, 255000, China
| | - Hanyun Tang
- Department of Nephrology and Immunology, Children's Hospital of Soochow University, Suzhou, 215003, China
| | - Qiang Lin
- Department of Nephrology and Immunology, Children's Hospital of Soochow University, Suzhou, 215003, China
| | - Yunyan Shen
- Department of Nephrology and Immunology, Children's Hospital of Soochow University, Suzhou, 215003, China
| | - Yun Zhu
- Department of Nephrology and Immunology, Children's Hospital of Soochow University, Suzhou, 215003, China
| | - Qinying Xu
- Department of Nephrology and Immunology, Children's Hospital of Soochow University, Suzhou, 215003, China
| | - Xiaozhong Li
- Department of Nephrology and Immunology, Children's Hospital of Soochow University, Suzhou, 215003, China.
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Steegh FMEG, Keijbeck AA, de Hoogt PA, Rademakers T, Houben AJHM, Reesink KD, Stehouwer CDA, Daemen MJAP, Peutz-Kootstra CJ. Capillary rarefaction: a missing link in renal and cardiovascular disease? Angiogenesis 2024; 27:23-35. [PMID: 37326760 DOI: 10.1007/s10456-023-09883-8] [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: 03/20/2023] [Accepted: 05/28/2023] [Indexed: 06/17/2023]
Abstract
Patients with chronic kidney disease (CKD) have an increased risk for cardiovascular morbidity and mortality. Capillary rarefaction may be both one of the causes as well as a consequence of CKD and cardiovascular disease. We reviewed the published literature on human biopsy studies and conclude that renal capillary rarefaction occurs independently of the cause of renal function decline. Moreover, glomerular hypertrophy may be an early sign of generalized endothelial dysfunction, while peritubular capillary loss occurs in advanced renal disease. Recent studies with non-invasive measurements show that capillary rarefaction is detected systemically (e.g., in the skin) in individuals with albuminuria, as sign of early CKD and/or generalized endothelial dysfunction. Decreased capillary density is found in omental fat, muscle and heart biopsies of patients with advanced CKD as well as in skin, fat, muscle, brain and heart biopsies of individuals with cardiovascular risk factors. No biopsy studies have yet been performed on capillary rarefaction in individuals with early CKD. At present it is unknown whether individuals with CKD and cardiovascular disease merely share the same risk factors for capillary rarefaction, or whether there is a causal relationship between rarefaction in renal and systemic capillaries. Further studies on renal and systemic capillary rarefaction, including their temporal relationship and underlying mechanisms are needed. This review stresses the importance of preserving and maintaining capillary integrity and homeostasis in the prevention and management of renal and cardiovascular disease.
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Affiliation(s)
- Floor M E G Steegh
- Department of Pathology, Maastricht University Medical Centre+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Anke A Keijbeck
- Department of Pathology, Maastricht University Medical Centre+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Patrick A de Hoogt
- Surgery, Maastricht University Medical Centre+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Timo Rademakers
- Department of Cell Biology-Inspired Tissue Engineering, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, The Netherlands
| | - Alfons J H M Houben
- Internal Medicine, Maastricht University Medical Centre+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Koen D Reesink
- Biomedical Engineering, Maastricht University Medical Centre+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Coen D A Stehouwer
- Internal Medicine, Maastricht University Medical Centre+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Mat J A P Daemen
- Department of Pathology, UMC Amsterdam Cardiovascular Sciences, University of Amsterdam, Amsterdam, The Netherlands
| | - Carine J Peutz-Kootstra
- Department of Pathology, Maastricht University Medical Centre+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands.
- Department of Pathology, Gelre Ziekenhuizen, Apeldoorn, The Netherlands.
- , Porthoslaan 39, 6213 CN, Maastricht, The Netherlands.
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van der Weijden J, De Hoogt PA, Leufkens MME, Keijbeck AA, van Goor H, van den Heuvel MC, Cleutjens JPM, Moers C, Snoeijs MG, Navis GJ, van Londen M, Nolte IM, Berger SP, De Borst MH, Peutz-Kootstra CJ. The relationship of peritubular capillary density with glomerular volume and kidney function in living kidney donors. J Nephrol 2023; 36:2111-2124. [PMID: 37768545 PMCID: PMC10543576 DOI: 10.1007/s40620-023-01734-5] [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: 03/09/2023] [Accepted: 07/03/2023] [Indexed: 09/29/2023]
Abstract
BACKGROUND Peritubular capillary rarefaction plays an important role in the progression of chronic kidney disease. Little is known about the relation between peritubular capillary density, glomerular volume and filtration rate in the healthy kidney. METHODS In this single-center study, we included 69 living kidney donors who donated between 2005 and 2008 and had representative renal biopsies available. In all donors, glomerular filtration rate was measured using 125I-Iothalamate before donation and at five years after donation. Before donation, the increase in glomerular filtration rate after dopamine stimulation was measured. Glomerular volume and peritubular capillary density were determined in biopsies taken at the time of transplantation. Pearson's correlation coefficient and linear regression were used to assess relations between parameters. RESULTS Mean donor age was 52 ± 11 years and mean measured glomerular filtration rate was 119 ± 22 mL/min before donation and 82 ± 15 mL/min at five years after donation. While peritubular capillary density (measured by either number of peritubular capillaries/50,000 μm2 or number of peritubular capillaries/tubule) was not associated with measured glomerular filtration rate before or after donation, number of peritubular capillaries/tubule was associated with the increase in measured glomerular filtration rate after dopamine stimulation (St.β = 0.33, p = 0.004), and correlated positively with glomerular volume (R = 0.24, p = 0.047). Glomerular volume was associated with unstimulated measured glomerular filtration rate before donation (St.β = 0.31, p = 0.01) and at five years (St.β = 0.30, p = 0.01) after donation, independent of age. CONCLUSIONS In summary, peritubular capillary density was not related to unstimulated kidney function before or after kidney donation, in contrast to glomerular volume. However, number of peritubular capillaries/tubule correlated with the increase in glomerular filtration rate after dopamine stimulation in healthy kidneys, and with glomerular volume. These findings suggest that peritubular capillary density and glomerular volume differentially affect kidney function in healthy living kidney donors.
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Affiliation(s)
- J van der Weijden
- Division of Nephrology, Department of Internal Medicine, University Medical Center Groningen, University of Groningen, Hanzeplein 1, P.O. Box AA53, 9713 GZ, Groningen, The Netherlands.
| | - P A De Hoogt
- Department of Vascular Surgery, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - M M E Leufkens
- Department of Pathology, Maastricht University Medical Center+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, The Netherlands
| | - A A Keijbeck
- Department of Pathology, Maastricht University Medical Center+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, The Netherlands
| | - H van Goor
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - M C van den Heuvel
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - J P M Cleutjens
- Department of Pathology, Maastricht University Medical Center+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, The Netherlands
| | - C Moers
- Department of Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - M G Snoeijs
- Department of Vascular Surgery, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - G J Navis
- Division of Nephrology, Department of Internal Medicine, University Medical Center Groningen, University of Groningen, Hanzeplein 1, P.O. Box AA53, 9713 GZ, Groningen, The Netherlands
| | - M van Londen
- Division of Nephrology, Department of Internal Medicine, University Medical Center Groningen, University of Groningen, Hanzeplein 1, P.O. Box AA53, 9713 GZ, Groningen, The Netherlands
| | - I M Nolte
- Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - S P Berger
- Division of Nephrology, Department of Internal Medicine, University Medical Center Groningen, University of Groningen, Hanzeplein 1, P.O. Box AA53, 9713 GZ, Groningen, The Netherlands
| | - M H De Borst
- Division of Nephrology, Department of Internal Medicine, University Medical Center Groningen, University of Groningen, Hanzeplein 1, P.O. Box AA53, 9713 GZ, Groningen, The Netherlands
| | - C J Peutz-Kootstra
- Department of Pathology, Maastricht University Medical Center+, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, The Netherlands
- Department of Pathology, Gelre Ziekenhuizen, Apeldoorn, The Netherlands
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Chen Y, Zee J, Janowczyk AR, Rubin J, Toro P, Lafata KJ, Mariani LH, Holzman LB, Hodgin JB, Madabhushi A, Barisoni L. Clinical Relevance of Computationally Derived Attributes of Peritubular Capillaries from Kidney Biopsies. KIDNEY360 2023; 4:648-658. [PMID: 37016482 PMCID: PMC10278770 DOI: 10.34067/kid.0000000000000116] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 02/13/2023] [Indexed: 04/06/2023]
Abstract
Key Points Computational image analysis allows for the extraction of new information from whole-slide images with potential clinical relevance. Peritubular capillary (PTC) density is decreased in areas of interstitial fibrosis and tubular atrophy when measured in interstitial fractional space. PTC shape (aspect ratio) is associated with clinical outcome in glomerular diseases. Background The association between peritubular capillary (PTC) density and disease progression has been studied in a variety of kidney diseases using immunohistochemistry. However, other PTC attributes, such as PTC shape, have not been explored yet. The recent development of computer vision techniques provides the opportunity for the quantification of PTC attributes using conventional stains and whole-slide images. Methods To explore the relationship between PTC characteristics and clinical outcome, n =280 periodic acid–Schiff-stained kidney biopsies (88 minimal change disease, 109 focal segmental glomerulosclerosis, 46 membranous nephropathy, and 37 IgA nephropathy) from the Nephrotic Syndrome Study Network digital pathology repository were computationally analyzed. A previously validated deep learning model was applied to segment cortical PTCs. Average PTC aspect ratio (PTC major to minor axis ratio), size (PTC pixels per PTC segmentation), and density (PTC pixels per unit cortical area) were computed for each biopsy. Cox proportional hazards models were used to assess associations between these PTC parameters and outcome (40% eGFR decline or kidney failure). Cortical PTC characteristics and interstitial fractional space PTC density were compared between areas of interstitial fibrosis and tubular atrophy (IFTA) and areas without IFTA. Results When normalized PTC aspect ratio was below 0.6, a 0.1, increase in normalized PTC aspect ratio was significantly associated with disease progression, with a hazard ratio (95% confidence interval) of 1.28 (1.04 to 1.59) (P = 0.019), while PTC density and size were not significantly associated with outcome. Interstitial fractional space PTC density was lower in areas of IFTA compared with non-IFTA areas. Conclusions Computational image analysis enables quantification of the status of the kidney microvasculature and the discovery of a previously unrecognized PTC biomarker (aspect ratio) of clinical outcome.
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Affiliation(s)
- Yijiang Chen
- Center for Computational Imaging and Personalized Diagnostics, Case Western Reserve University, Cleveland, Ohio
| | - Jarcy Zee
- Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia, Pennsylvania
- Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Andrew R. Janowczyk
- Geneva University Hospitals, Pathology and Oncology Departments, Geneva, Switzerland
- Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, Atlanta, Georgia
| | - Jeremy Rubin
- Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Paula Toro
- Department of Pathology, Cleveland Clinic, Cleveland, Ohio
| | - Kyle J. Lafata
- Department of Radiology, Duke University, Durham, North Carolina
- Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina
- Department of Radiation Oncology, Duke University, Durham, North Carolina
| | - Laura H. Mariani
- Department of Internal Medicine, Division of Nephrology, University of Michigan, Ann Arbor, Michigan
| | - Lawrence B. Holzman
- Department of Medicine, Renal-Electrolyte and Hypertension Division, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Jeffrey B. Hodgin
- Department of Pathology, University of Michigan, Ann Arbor, Michigan
| | - Anant Madabhushi
- Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, Atlanta, Georgia
- Atlanta Veterans Affairs Medical Center, Atlanta, Georgia
| | - Laura Barisoni
- Department of Pathology, Division of AI and Computational Pathology, Duke University, Durham, North Carolina
- Department of Medicine, Division of Nephrology, Duke University, Durham, North Carolina
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5
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Kwiatkowska E, Kwiatkowski S, Dziedziejko V, Tomasiewicz I, Domański L. Renal Microcirculation Injury as the Main Cause of Ischemic Acute Kidney Injury Development. BIOLOGY 2023; 12:biology12020327. [PMID: 36829602 PMCID: PMC9953191 DOI: 10.3390/biology12020327] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 02/04/2023] [Accepted: 02/09/2023] [Indexed: 02/22/2023]
Abstract
Acute kidney injury (AKI) can result from multiple factors. The main cause is reduced renal perfusion. Kidneys are susceptible to ischemia due to the anatomy of microcirculation that wraps around the renal tubules-peritubular capillary (PTC) network. Cortical and medullary superficial tubules have a large share in transport and require the supply of oxygen for ATP production, while it is the cortex that receives almost 100% of the blood flowing through the kidneys and the medulla only accounts for 5-10% of it. This difference makes the tubules present in the superficial layer of the medulla very susceptible to ischemia. Impaired blood flow causes damage to the endothelium, with an increase in its prothrombotic and pro-adhesive properties. This causes congestion in the microcirculation of the renal medulla. The next stage is the migration of pericytes with the disintegration of these vessels. The phenomenon of destruction of small vessels is called peritubular rarefaction, attributed as the main cause of further irreversible changes in the damaged kidney leading to the development of chronic kidney disease. In this article, we will present the characteristic structure of renal microcirculation, its regulation, and the mechanism of damage in acute ischemia, and we will try to find methods of prevention with particular emphasis on the inhibition of the renin-angiotensin-aldosterone system.
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Affiliation(s)
- Ewa Kwiatkowska
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University in Szczecin, Powstańców Wlkp, 72, 70-204 Szczecin, Poland
- Correspondence:
| | - Sebastian Kwiatkowski
- Department of Obstetrician and Gynecology, Pomeranian Medical University in Szczecin, Powstańców Wlkp, 72, 70-204 Szczecin, Poland
| | - Violetta Dziedziejko
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University in Szczecin, Powstańców Wlkp, 72, 70-204 Szczecin, Poland
| | - Izabela Tomasiewicz
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University in Szczecin, Powstańców Wlkp, 72, 70-204 Szczecin, Poland
| | - Leszek Domański
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University in Szczecin, Powstańców Wlkp, 72, 70-204 Szczecin, Poland
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Sarioglu S, Tekin E, Unlu M, Yildiz S, Heybeli, MD C. Peritubular Capillaritis in Native Kidney Biopsies. Am J Clin Pathol 2022; 158:389-394. [PMID: 35639718 DOI: 10.1093/ajcp/aqac061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 04/14/2022] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES To determine the frequency and predictors of peritubular capillaritis (PTCitis) among native kidney biopsies. METHODS Consecutive native kidney biopsies of 169 patients were reexamined for capturing possible PTCitis according to the Banff Classification. The relation of PTCitis with demographic and clinicopathological findings was evaluated. Logistic regression analysis was performed to determine predictors of PTCitis. RESULTS Peritubular capillaritis was captured in 90 (53.3%) patients, with scores of 1, 2, and 3 in 57 (33.7%), 31 (18.3%), and 2 (1.2%) patients, respectively. The highest frequency of PTCitis was observed in pauci-immune glomerulonephritis. In univariate analysis, male sex, the presence of interstitial inflammation, pauci-immune glomerulonephritis, and a higher serum creatinine level were associated with a higher risk of PTCitis, while severe interstitial fibrosis/tubular atrophy was associated with a lower risk. The presence of interstitial inflammation (odds ratio [OR], 5.94 [95% confidence interval (CI), 1.41-25.03]; P = .015), pauci-immune glomerulonephritis (OR, 3.08 [95% CI, 1.01-9.36]; P = .048), and a higher serum creatinine level (per 1 mg/dL) (OR, 1.56 [95% CI, 1.14-2.11]; P = .005) were independent predictors of PTCitis development in a multivariate regression model. CONCLUSIONS Peritubular capillaritis is common in native biopsies and more likely to be observed in the presence of interstitial inflammation, pauci-immune glomerulonephritis, and a higher serum creatinine level.
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Affiliation(s)
- Sulen Sarioglu
- Department of Pathology, Dokuz Eylül University Faculty of Medicine , İzmir , Turkey
| | - Emel Tekin
- Department of Pathology , Eskisehir Osmangazi University, Eskisehir, Turkey
| | - Mehtat Unlu
- Department of Pathology, Dokuz Eylül University Faculty of Medicine , İzmir , Turkey
| | - Serkan Yildiz
- Division of Nephrology, Medicana Hospital , İzmir , Turkey
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Core fucosylation involvement in the paracrine regulation of proteinuria-induced renal interstitial fibrosis evaluated with the use of a microfluidic chip. Acta Biomater 2022; 142:99-112. [PMID: 35189379 DOI: 10.1016/j.actbio.2022.02.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Revised: 02/11/2022] [Accepted: 02/15/2022] [Indexed: 11/23/2022]
Abstract
Proteinuria is a clinical manifestation of chronic kidney disease that aggravates renal interstitial fibrosis (RIF), in which injury of peritubular microvessels is an important event. However, the changes in peritubular microvessels induced by proteinuria and their molecular mechanisms remain unclear. Thus, we aimed to develop a co-culture microfluidic device that contains renal tubules and peritubular microvessels to create a proteinuria model. We found that protein overload in the renal tubule induced trans-differentiation and apoptosis of endothelial cells (ECs) and pericytes. Moreover, profiling of secreted proteins in this model revealed that a paracrine network between tubules and microvessels was activated in proteinuria-induced microvascular injury. Multiple cytokine receptors in this paracrine network were core-fucosylated. Inhibition of core fucosylation significantly reduced ligand-receptor binding ability and blocked downstream pathways, alleviating trans-differentiation and apoptosis of ECs and pericytes. Furthermore, the protective effect of genetic FUT8 deficiency on proteinuria overload-induced RIF and pericyte-myofibroblast trans-differentiation was validated in FUT8 knockout heterozygous mice. In conclusion, we constructed and used a multiple-unit integrated microfluidic device to uncover the mechanism of proteinuria-induced RIF. Furthermore, FUT8 may serve as a hub-like therapeutic target to alleviate peritubular microvascular injury in RIF. STATEMENT OF SIGNIFICANCE: In this study, we constructed a multiple-unit integrated renal tubule-vascular chip. We reproduced human proteinuria on the chip and found that multiple receptors were modified by FUT8-catalyzed core fucosylation (CF) involved in the cross-talk between renal tubules and peritubular microvessels in proteinuria-induced RIF, and inhibiting the FUT8 of receptors could block the tubule-microvessel paracrine network and reverse the damage of peritubular microvessels and renal interstitial fibrosis. This tubule-vascular chip may provide a prospective platform to facilitate future investigations into the mechanisms of kidney diseases, and target-FUT8 inhibition may be an innovative and potential therapeutic strategy for RIF induced by proteinuria.
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Peritubular Capillary Rarefaction: An Underappreciated Regulator of CKD Progression. Int J Mol Sci 2020; 21:ijms21218255. [PMID: 33158122 PMCID: PMC7662781 DOI: 10.3390/ijms21218255] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Accepted: 10/29/2020] [Indexed: 12/15/2022] Open
Abstract
Peritubular capillary (PTC) rarefaction is commonly detected in chronic kidney disease (CKD) such as hypertensive nephrosclerosis and diabetic nephropathy. Moreover, PTC rarefaction prominently correlates with impaired kidney function and predicts the future development of end-stage renal disease in patients with CKD. However, it is still underappreciated that PTC rarefaction is a pivotal regulator of CKD progression, primarily because the molecular mechanisms of PTC rarefaction have not been well-elucidated. In addition to the established mechanisms (reduced proangiogenic factors and increased anti-angiogenic factors), recent studies discovered significant contribution of the following elements to PTC loss: (1) prompt susceptibility of PTC to injury, (2) impaired proliferation of PTC, (3) apoptosis/senescence of PTC, and (4) pericyte detachment from PTC. Mainly based on the recent and novel findings in basic research and clinical study, this review describes the roles of the above-mentioned elements in PTC loss and focuses on the major factors regulating PTC angiogenesis, the assessment of PTC rarefaction and its surrogate markers, and an overview of the possible therapeutic agents to mitigate PTC rarefaction during CKD progression. PTC rarefaction is not only a prominent histological characteristic of CKD but also a central driving force of CKD progression.
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