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Guo M, Shen D, Su Y, Xu J, Zhao S, Zhang W, Wang Y, Jiang W, Wang J, Geng X, Ding X, Xu X. Syndecan-1 shedding destroys epithelial adherens junctions through STAT3 after renal ischemia/reperfusion injury. iScience 2023; 26:108211. [PMID: 37942007 PMCID: PMC10628745 DOI: 10.1016/j.isci.2023.108211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 07/22/2023] [Accepted: 10/11/2023] [Indexed: 11/10/2023] Open
Abstract
Adherens junctions between tubular epithelial cells are disrupted in renal ischemia/reperfusion (I/R) injury. Syndecan-1 (SDC-1) is involved in maintaining cell morphology. We aimed to study the role of SDC-1 shedding induced by renal I/R in the destruction of intracellular adherens junctions. We found that SDC-1 shedding was increased while the expression of E-cadherin was decreased. This observation was accompanied by the activation of STAT3 in the kidneys. Inhibiting the shedding of SDC-1 induced by I/R could alleviate this effect. Mild renal I/R could induce more severe renal injury, lower E-cadherin expression, damaged cell junctions, and activated STAT3 in knockout mice with the tubule-specific deletion of SDC-1 mice. The results in vitro were consistent with those in vivo. Inhibiting the shedding of SDC-1 could alleviate the decreased expression of E-cadherin and damage of cell adherens junctions through inhibiting the activation of STAT3 during ischemic acute kidney injury.
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Affiliation(s)
- Man Guo
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Daoqi Shen
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Yiqi Su
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Jiarui Xu
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Shuan Zhao
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Weidong Zhang
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Yaqiong Wang
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Wuhua Jiang
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Jialin Wang
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Xuemei Geng
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Xiaoqiang Ding
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
| | - Xialian Xu
- Division of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Medical Center of Kidney Disease, Shanghai, China
- Shanghai Institute of Kidney and Dialysis, Shanghai, China
- Key Laboratory of Kidney and Blood Purification, Shanghai, China
- Hemodialysis quality control center of Shanghai, Shanghai, China
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Strubl S, Torres JA, Spindt AK, Pellegrini H, Liebau MC, Weimbs T. STAT signaling in polycystic kidney disease. Cell Signal 2020; 72:109639. [PMID: 32325185 PMCID: PMC7269822 DOI: 10.1016/j.cellsig.2020.109639] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 04/13/2020] [Accepted: 04/14/2020] [Indexed: 02/06/2023]
Abstract
The most common form of polycystic kidney disease (PKD) in humans is caused by mutations in the PKD1 gene coding for polycystin1 (PC1). Among the many identified or proposed functions of PC1 is its ability to regulate the activity of transcription factors of the STAT family. Most STAT proteins that have been investigated were found to be aberrantly activated in kidneys in PKD, and some have been shown to be drivers of disease progression. In this review, we focus on the role of signal transducer and activator of transcription (STAT) signaling pathways in various renal cell types in healthy kidneys as compared to polycystic kidneys, on the mechanisms of STAT regulation by PC1 and other factors, and on the possibility to target STAT signaling for PKD therapy.
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Affiliation(s)
- Sebastian Strubl
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA 93106-9625, USA; Department II of Internal Medicine, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Jacob A Torres
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA 93106-9625, USA
| | - Alison K Spindt
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA 93106-9625, USA
| | - Hannah Pellegrini
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA 93106-9625, USA
| | - Max C Liebau
- Department of Pediatrics and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany; Department II of Internal Medicine, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Thomas Weimbs
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA 93106-9625, USA.
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3
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Chen W, Yuan H, Cao W, Wang T, Chen W, Yu H, Fu Y, Jiang B, Zhou H, Guo H, Zhao X. Blocking interleukin-6 trans-signaling protects against renal fibrosis by suppressing STAT3 activation. Am J Cancer Res 2019; 9:3980-3991. [PMID: 31281526 PMCID: PMC6592178 DOI: 10.7150/thno.32352] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 04/09/2019] [Indexed: 01/04/2023] Open
Abstract
Rationale: Renal fibrosis is the terminal manifestation of chronic and irreversible renal disease. Effective therapies other than dialysis are extremely limited. In this study, we investigated the potential effects of targeting elevated interleukin-6 (IL-6) levels in the treatment of renal fibrosis. Methods: Fc-gp130 was used to specifically block IL-6 trans-signaling. Unilateral ureteral occlusion (UUO) and ischemia reperfusion (IR) mouse models were constructed to investigate the therapeutic effect of Fc-gp130 on renal fibrosis. The role of IL-6 trans-signaling and phosphorylation of signal transducer and activator of transcription (STAT) 3 in regulating fibroblast accumulation and extracellular matrix protein deposition were evaluated in cell experiments and mouse models. Results: The kidneys of mice with UUO were found to have elevated soluble IL-6 receptor (sIL-6R) levels in the progression of fibrosis. Fc-gp130 attenuated renal fibrosis in mice, as evidenced by reductions in tubular atrophy and the production of extracellular matrix protein. Blockade of IL-6 trans-signaling with Fc-gp130 also reduced inflammation levels, immune cell infiltration, and profibrotic cytokines expression in renal tissue, with decreased STAT3 phosphorylation and reduced fibroblast accumulation in the renal tissue. In vitro, Fc-gp130 also reduced the phosphorylation of STAT3 induced by transforming growth factor (TGF)-β1 in fibroblasts. Furthermore, the therapeutic effect of Fc-gp130 was confirmed in a model of acute kidney injury-chronic kidney disease. Conclusion: Overall, IL-6 trans-signaling may contribute to crucial events in the development of renal fibrosis, and the targeting of IL-6 trans-signaling by Fc-gp130 may provide a novel therapeutic strategy for the treatment of renal fibrosis.
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Dube S, Matam T, Yen J, Mang HE, Dagher PC, Hato T, Sutton TA. Endothelial STAT3 Modulates Protective Mechanisms in a Mouse Ischemia-Reperfusion Model of Acute Kidney Injury. J Immunol Res 2017; 2017:4609502. [PMID: 29181415 PMCID: PMC5664346 DOI: 10.1155/2017/4609502] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 08/29/2017] [Indexed: 01/24/2023] Open
Abstract
STAT3 is a transcriptional regulator that plays an important role in coordinating inflammation and immunity. In addition, there is a growing appreciation of the role STAT3 signaling plays in response to organ injury following diverse insults. Acute kidney injury (AKI) from ischemia-reperfusion injury is a common clinical entity with devastating consequences, and the recognition that endothelial alterations contribute to kidney dysfunction in this setting is of growing interest. Consequently, we used a mouse with a genetic deletion of Stat3 restricted to the endothelium to examine the role of STAT3 signaling in the pathophysiology of ischemic AKI. In a mouse model of ischemic AKI, the loss of endothelial STAT3 signaling significantly exacerbated kidney dysfunction, morphologic injury, and proximal tubular oxidative stress. The increased severity of ischemic AKI was associated with more robust endothelial-leukocyte adhesion and increased tissue accumulation of F4/80+ macrophages. Moreover, important proximal tubular adaptive mechanisms to injury were diminished in association with decreased tissue mRNA levels of the epithelial cell survival cytokine IL-22. In aggregate, these findings suggest that the endothelial STAT3 signaling plays an important role in limiting kidney dysfunction in ischemic AKI and that selective pharmacologic activation of endothelial STAT3 signaling could serve as a potential therapeutic target.
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Affiliation(s)
- Shataakshi Dube
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Tejasvi Matam
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jessica Yen
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Henry E. Mang
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Pierre C. Dagher
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Takashi Hato
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Timothy A. Sutton
- Department of Medicine, Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
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5
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Jin X, Xu Z, Zhao X, Chen M, Xu S. The antagonistic effect of selenium on lead-induced apoptosis via mitochondrial dynamics pathway in the chicken kidney. CHEMOSPHERE 2017; 180:259-266. [PMID: 28411542 DOI: 10.1016/j.chemosphere.2017.03.130] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/23/2017] [Accepted: 03/29/2017] [Indexed: 06/07/2023]
Abstract
Selenium (Se) is known to have antagonistic effects against lead (Pb) toxicity in animal. The aim of this study was to evaluate the roles of mitochondrial dynamics on Pb-induced apoptosis in the chicken kidney and investigate the antagonistic effect of Se. In the present study, brown layer chickens were randomly allocated to four groups, and each group were exposed to a basic diet (0.2 mg kg-1 Se and 0.5 mg kg-1 Pb), a Se-adequate diet (1 mg kg-1 Se and 0.5 mg kg-1 Pb), a Se and Pb compound diet (1 mg kg-1 Se and 350 mg kg-1 Pb) or a Pb supplemented diet (0.2 mg kg-1 Se and 350 mg kg-1 Pb). On the 90th day, the kidney was removed to determine the activities of mitochondrial respiratory chain complexes, ATPases and oxidative indexes. The expression levels of mitochondrial dynamics and apoptosis-related genes were also determined. The results showed that Pb treatment significantly decreased the activities of mitochondrial complexes and ATPases, and increased oxidative stress, and mitochondrial dynamics and anti-apoptosis-related genes had a lower expression, whereas mitochondrial pro-apoptosis related genes presented higher expressions in the Pb group compared with control group (P < 0.05). However, the co-treatment of Se and Pb significantly alleviated those changes compared with the Pb group (P < 0.05). In conclusion, we speculated that Pb could increase the oxidative stress and promote the apoptosis via regulating mitochondrial dynamics and apoptosis-related genes, and Se exhibited antagonistic roles against the Pb-induced apoptosis in the kidney of chickens.
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Affiliation(s)
- Xi Jin
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China
| | - Zhe Xu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China
| | - Xia Zhao
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China
| | - Menghao Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China
| | - Shiwen Xu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China.
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Calzavacca P, May CN, Bellomo R. Glomerular haemodynamics, the renal sympathetic nervous system and sepsis-induced acute kidney injury. Nephrol Dial Transplant 2014; 29:2178-2184. [DOI: 10.1093/ndt/gfu052] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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7
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Yang C, Xu Z, Zhao Z, Li L, Zhao T, Peng D, Xu M, Rong R, Long YQ, Zhu T. A novel proteolysis-resistant cyclic helix B peptide ameliorates kidney ischemia reperfusion injury. Biochim Biophys Acta Mol Basis Dis 2014; 1842:2306-17. [PMID: 25220479 DOI: 10.1016/j.bbadis.2014.09.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Revised: 08/14/2014] [Accepted: 09/02/2014] [Indexed: 12/27/2022]
Abstract
Helix B surface peptide (HBSP), derived from erythropoietin, displays powerful tissue protection during kidney ischemia reperfusion (IR) injury without erythropoietic side effects. We employed cyclization strategy for the first time, and synthesized thioether-cyclized helix B peptide (CHBP) to improve metabolic stability and renoprotective effect. LC-MS/MS analysis was adopted to examine the stability of CHBP in vitro and in vivo. The renoprotective effect of CHBP in terms of renal function, apoptosis, inflammation, extracellular matrix deposition, and histological injury was also detected in vivo and in vitro. Antibody array and western blot were performed to analyze the signal pathway of involvement by CHBP in the IR model and renal tubular epithelial cells. In this study, thioether-cyclized peptide was significantly stable in vivo and in vitro. One dose of 8nmol/kg CHBP administered intraperitoneally at the onset of reperfusion improved renal protection compared with three doses of 8nmol/kg linear HBSP in a 48h murine IR model. In a one-week model, the one dose CHBP-treated group exhibited remarkably improved renal function over the IR group, and attenuated kidney injury, including reduced inflammation and apoptosis. Interestingly, we found that the phosphorylation of autophagy protein mTORC1 was dramatically reduced upon CHBP treatment. We also demonstrated that CHBP induced autophagy via inhibition of mTORC1 and activation of mTORC2, leading to renoprotective effects on IR. Our results indicate that the novel metabolically stable CHBP is a promising therapeutic medicine for kidney IR injury treatment.
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Affiliation(s)
- Cheng Yang
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China; Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Zhongliang Xu
- CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Zitong Zhao
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China; Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Long Li
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China; Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Tian Zhao
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China; Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Dian Peng
- CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Ming Xu
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China; Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Ruiming Rong
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China; Shanghai Key Laboratory of Organ Transplantation, Shanghai, China; Department of Transfusion, Zhongshan Hospital, Fudan University, Shanghai, China.
| | - Ya-Qiu Long
- CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.
| | - Tongyu Zhu
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China; Shanghai Key Laboratory of Organ Transplantation, Shanghai, China; Qingpu Branch Zhongshan Hospital, Fudan University, Shanghai, China.
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8
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Weimbs T, Olsan EE, Talbot JJ. Regulation of STATs by polycystin-1 and their role in polycystic kidney disease. JAKSTAT 2014; 2:e23650. [PMID: 24058808 PMCID: PMC3710321 DOI: 10.4161/jkst.23650] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 01/16/2013] [Accepted: 01/17/2013] [Indexed: 01/14/2023] Open
Abstract
Autosomal-dominant polycystic kidney disease (ADPKD) is a common genetic disease caused by mutations in the gene coding for polycystin-1 (PC1). PC1 can regulate STAT transcription factors by a novel, dual mechanism. STAT3 and STAT6 are aberrantly activated in renal cysts. Genetic and pharmacological approaches to inhibit STAT3 or STAT6 have led to promising results in ADPKD mouse models. Here, we review current findings that lead to a model of PC1 as a key regulator of STAT signaling in renal tubule cells. We discuss how PC1 may orchestrate appropriate epithelial responses to renal injury, and how this system may lead to aberrant STAT activation in ADPKD thereby causing inappropriate activation of tissue repair programs that culminate in renal cyst growth and fibrosis.
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Affiliation(s)
- Thomas Weimbs
- Department of Molecular, Cellular, and Developmental Biology; and Neuroscience Research Institute; University of California, Santa Barbara; Santa Barbara, CA USA
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9
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Burnstock G, Evans LC, Bailey MA. Purinergic signalling in the kidney in health and disease. Purinergic Signal 2014; 10:71-101. [PMID: 24265071 PMCID: PMC3944043 DOI: 10.1007/s11302-013-9400-5] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Accepted: 10/24/2013] [Indexed: 12/21/2022] Open
Abstract
The involvement of purinergic signalling in kidney physiology and pathophysiology is rapidly gaining recognition and this is a comprehensive review of early and recent publications in the field. Purinergic signalling involvement is described in several important intrarenal regulatory mechanisms, including tuboglomerular feedback, the autoregulatory response of the glomerular and extraglomerular microcirculation and the control of renin release. Furthermore, purinergic signalling influences water and electrolyte transport in all segments of the renal tubule. Reports about purine- and pyrimidine-mediated actions in diseases of the kidney, including polycystic kidney disease, nephritis, diabetes, hypertension and nephrotoxicant injury are covered and possible purinergic therapeutic strategies discussed.
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Affiliation(s)
- Geoffrey Burnstock
- Autonomic Neuroscience Centre, University College Medical School, Rowland Hill Street, London, NW3 2PF, UK,
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10
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Abstract
Mutations in the gene coding for the integral membrane protein polycystin-1 (PC1) are the cause of most cases of autosomal-dominant polycystic kidney disease (ADPKD), a very common disease that leads to kidney failure and currently lacks approved treatment. Recent work has revealed that PC1 can regulate the transcription factor STAT3, and that STAT3 is aberrantly activated in the kidneys of ADPKD patients and PKD mouse models. Recent approaches to directly inhibit STAT3 in PKD mouse models have been promising. Numerous signaling pathways are known to activate STAT3 and many have long been implicated in the pathogenesis of PKD - such as EGF/EGFR, HGF/c-Met, Src. However, a role of STAT3 in the pathogenesis of PKD had never been considered until now. Here, we review the current findings that suggest that STAT3 is a promising target for the treatment of PKD.
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Affiliation(s)
- Thomas Weimbs
- Department of Molecular, Cellular, and Developmental Biology; and Neuroscience Research Institute, University of California, Santa Barbara, CA 93106-9610, U.S.A
| | - Jeffrey J Talbot
- Department of Molecular, Cellular, and Developmental Biology; and Neuroscience Research Institute, University of California, Santa Barbara, CA 93106-9610, U.S.A
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11
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Neuwirt H, Eder IE, Puhr M, Rudnicki M. SOCS-3 is downregulated in progressive CKD patients and regulates proliferation in human renal proximal tubule cells in a STAT1/3 independent manner. J Transl Med 2013; 93:123-34. [PMID: 23108375 DOI: 10.1038/labinvest.2012.154] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Proliferation and the sequence of epithelial to mesenchymal transition (EMT) and mesenchymal to epithelial transition (MET), called epithelial-mesenchymal-epithelial (EME) cycling are pivotal mechanisms of kidney repair and fibrosis. Furthermore, data suggest that dedifferentiation (EMT) is a prerequisite for proliferation of tubule cells. These processes have been shown to be regulated by STAT1/3 signaling. Suppressor of cytokine signaling-3 (SOCS-3) is a negative regulator of STAT1/3 signaling. Using a transcriptomics data set of patients with proteinuric kidney diseases we found that low levels of SOCS-3 RNA were associated with high-serum creatinine values in the long-term follow-up, which suggested a role of SOCS-3, regulated signaling in progression of chronic kidney disease. This result was validated in an independent cohort of patients with proteinuric nephropathies on protein level. In addition ∼60% of STAT target genes were differentially expressed in relation to stable kidney disease patients. Using two renal cellular models and SOCS-3 knockdown by short interfering RNA we investigated SOCS-3 effects on oncostatin M-induced STAT activation, differentiation and proliferation. SOCS-3 knockdown resulted in enhanced pSTAT1/3 phosphorylation and epithelial differentiation. The latter effect was only slightly enhanced by OSM treatment. Cellular proliferation was inhibited after SOCS-3 knockdown. This effect could not be further stimulated by OSM. Effects of SOCS-3 knockdown were not enhanced by downregulation of STAT1/3, suggesting a STAT independent effect on cell cycle regulators. Indeed, knockdown and overexpression of SOCS-3 were associated with decrease and increase of cyclin D1, -E and proliferation, respectively. In summary, SOCS-3 inhibits phosphorylation of pSTAT1/3 in renal tubule cells. Additionally, we show for the first time that-in vivo-loss of SOCS-3 is associated with unfavorable prognosis. In vitro, downregulation of SOCS-3 inhibits dedifferentiation (EMT) and cellular proliferation in kidney proximal tubule cells.
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Affiliation(s)
- Hannes Neuwirt
- Department of Internal Medicine IV, Nephrology and Hypertension, Medical University Innsbruck, Innsbruck, Austria.
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12
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Zhang X, Urbieta-Caceres VH, Eirin A, Bell CC, Crane JA, Tang H, Jordan KL, Oh YK, Zhu XY, Korsmo MJ, Bachar AR, Cohen P, Lerman A, Lerman LO. Humanin prevents intra-renal microvascular remodeling and inflammation in hypercholesterolemic ApoE deficient mice. Life Sci 2012; 91:199-206. [PMID: 22820173 DOI: 10.1016/j.lfs.2012.07.010] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 06/11/2012] [Accepted: 07/06/2012] [Indexed: 11/17/2022]
Abstract
AIMS Humanin (HN) is an endogenous mitochondrial-derived cytoprotective peptide that has shown protective effects against atherosclerosis and is expressed in human vessels. However, its effects on the progression of kidney disease are unknown. We hypothesized that HN would protect the kidney in the early phase of atherogenesis. MAIN METHODS Forty-eight mice were studied in four groups (n=12 each). Twenty-four ApoE deficient mice were fed a 16-week high-cholesterol diet supplemented with saline or HN (4mg/kg/day, intraperitoneal). C57BL/6 mice were fed a normal diet supplemented with saline or HN. Microvascular architecture was assessed with micro-CT and vascular wall remodeling by alpha-SMA staining. The effects of HN on angiogenesis, inflammation, apoptosis and fibrosis were evaluated in the kidney tissue by Western blotting and histology. KEY FINDINGS Cortical microvascular spatial density and media/lumen area ratio were significantly increased in high-cholesterol diet fed ApoE deficient mice, but restored by HN. HN up-regulated the renal expressions of anti-angiogenic proteins angiostatin and TSP-1, and inhibited angiopoietin-1. HN attenuated inflammation by down-regulating MCP-1, TNF-alpha and osteopontin. HN also tended to restore pSTAT3 and attenuated Bax expression, suggesting blunted apoptosis. Kidney collagen IV expression was alleviated by HN treatment. SIGNIFICANCE HN attenuates renal microvascular remodeling, inflammation and apoptosis in the early stage of kidney disease in hypercholesterolemic ApoE(-/-) mice. HN may serve as a novel therapeutic target to mitigate kidney damage in early atherosclerosis.
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Affiliation(s)
- Xin Zhang
- Division of Nephrology and Hypertension, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
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13
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Vacas E, Fernández-Martínez AB, Bajo AM, Sánchez-Chapado M, Schally AV, Prieto JC, Carmena MJ. Vasoactive intestinal peptide (VIP) inhibits human renal cell carcinoma proliferation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1823:1676-85. [PMID: 22728770 DOI: 10.1016/j.bbamcr.2012.06.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 05/29/2012] [Accepted: 06/14/2012] [Indexed: 12/13/2022]
Abstract
Clear renal cell carcinoma (cRCC) is an aggressive and fatal neoplasm. The present work was undertaken to investigate the antiproliferative potential of vasoactive intestinal peptide (VIP) exposure on non-tumoral (HK2) and tumoral (A498, cRCC) human proximal tubular epithelial cell lines. Reverse transcription and semiquantitative PCR was used at the VIP mRNA level whereas enzyme immunoanalysis was performed at the protein level. Both renal cell lines expressed VIP as well as VIP/pituitary adenylate cyclase-activating peptide (VPAC) receptors whereas only HK2 cells expressed formyl peptide receptor-like 1 (FPRL-1). Receptors were functional, as shown by VIP stimulation of adenylyl cyclase activity. Treatment with 0.1μM VIP (24h) inhibited proliferation of A498 but not HK2 cells as based on a reduction in the incorporation of [(3)H]-thymidine and BrdU (5'-Br-2'-deoxyuridine), PCNA (proliferating-cell nuclear antigen) expression and STAT3 (signal transducer and activator of transcription 3) expression and activation. VPAC(1)-receptor participation was established using JV-1-53 antagonist and siRNA transfection. Growth-inhibitory response to VIP was related to the cyclic adenosine monophosphate (cAMP)/exchange protein directly activated by cAMP (EPAC)/phosphoinositide 3-kinase (PI3-K) signaling systems as shown by studies on adenylate cyclase stimulation, and using the EPAC-specific compound 8CPT-2Me-cAMP and specific kinase inhibitors such as H89, wortmannin and PD98059. The efficacy of VIP on the prevention of tumor progression was confirmed in vivo using xenografted athymic mouse. These actions support a potential role of this peptide and its agonists in new therapies for cRCC.
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Affiliation(s)
- Eva Vacas
- Department of Biochemistry and Molecular Biology, University of Alcalá, Alcalá de Henares, Spain
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Carneiro PDS, Peters LC, Vorraro F, Borrego A, Ribeiro OG, Starobinas N, Jensen JR, Cabrera WHK, Ibañez OM, De Franco M. Gene expression profiles of bone marrow cells from mice phenotype-selected for maximal or minimal acute inflammations: searching for genes in acute inflammation modifier loci. Immunology 2008; 128:e562-71. [PMID: 19740317 DOI: 10.1111/j.1365-2567.2008.03032.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Two mouse lines were phenotype-selected for maximum (AIRmax) or minimum (AIRmin) acute inflammation responses to polyacrylamide bead (Biogel) injection. These lines differ in terms of bone marrow granulopoiesis, neutrophil resistance to apoptosis, and inflammatory cytokine production during acute inflammation responses. We compared gene expression profiles in bone marrow cells (BMC) of AIRmax and AIRmin mice during acute inflammatory reactions. The BMC from femurs were recovered 24 hr after subcutaneous injections of Biogel. Global gene expression analysis was performed on CodeLink Bioarrays (36K genes) using RNA pools of BMC from both control and treated AIRmax and AIRmin mice. Differentially expressed genes were statistically established and the over-represented gene ontology biological process categories were identified. Upregulations of about 136 and 198 genes were observed in the BMC of Biogel-treated AIRmax and AIRmin mice, respectively, but 740 genes were found to be downregulated in AIRmin mice compared with 94 genes in AIRmax mice. The over-represented biological themes of the differently expressed genes among AIRmax and AIRmin mice represent inflammatory response, signal transduction, cell proliferation and immune cell chemotaxis. We were able to demonstrate a broad downmodulation of gene transcripts in BMC from AIRmin mice during acute inflammation, and significant differentially expressed genes colocalized with previously mapped regions for inflammation-related phenotypes in chromosomes 1, 3, 6 and 11.
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