1
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Gekle M, Eckenstaler R, Braun H, Olgac A, Robaa D, Mildenberger S, Dubourg V, Schreier B, Sippl W, Benndorf R. Direct GPCR-EGFR interaction enables synergistic membrane-to-nucleus information transfer. Cell Mol Life Sci 2024; 81:272. [PMID: 38900158 PMCID: PMC11335197 DOI: 10.1007/s00018-024-05281-5] [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: 12/27/2023] [Revised: 04/12/2024] [Accepted: 05/14/2024] [Indexed: 06/21/2024]
Abstract
We addressed the heteromerization of the epidermal growth factor receptor (EGFR) with G-protein coupled receptors (GPCR) on the basis of angiotensin-II-receptor-subtype-1(AT1R)-EGFR interaction as proof-of-concept and show its functional relevance during synergistic nuclear information transfer, beyond ligand-dependent EGFR transactivation. Following in silico modelling, we generated EGFR-interaction deficient AT1R-mutants and compared them to AT1R-wildtype. Receptor interaction was assessed by co-immunoprecipitation (CoIP), Förster resonance energy transfer (FRET) and fluorescence-lifetime imaging microscopy (FLIM). Changes in cell morphology, ERK1/2-phosphorylation (ppERK1/2), serum response factor (SRF)-activation and cFOS protein expression were determined by digital high content microscopy at the single cell level. FRET, FLIM and CoIP confirmed the physical interaction of AT1R-wildtype with EGFR that was strongly reduced for the AT1R-mutants. Responsiveness of cells transfected with AT1R-WT or -mutants to angiotensin II or EGF was similar regarding changes in cell circularity, ppERK1/2 (direct and by ligand-dependent EGFR-transactivation), cFOS-expression and SRF-activity. By contrast, the EGFR-AT1R-synergism regarding these parameters was completely absent for in the interaction-deficient AT1R mutants. The results show that AT1R-EGFR heteromerisation enables AT1R-EGFR-synergism on downstream gene expression regulation, modulating the intensity and the temporal pattern of nuclear AT1R/EGFR-information transfer. Furthermore, remote EGFR transactivation, via ligand release or cytosolic tyrosine kinases, is not sufficient for the complete synergistic control of gene expression.
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Affiliation(s)
- Michael Gekle
- Julius-Bernstein-Institute of Physiology, Martin Luther University Halle-Wittenberg, 06112, Halle (Saale), Germany.
| | - Robert Eckenstaler
- Institute of Pharmacy, Department of Clinical Pharmacy and Pharmacotherapy, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Heike Braun
- Institute of Pharmacy, Department of Clinical Pharmacy and Pharmacotherapy, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Abdurrahman Olgac
- Institute of Pharmacy, Department of Medical Chemistry, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Dina Robaa
- Institute of Pharmacy, Department of Medical Chemistry, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Sigrid Mildenberger
- Julius-Bernstein-Institute of Physiology, Martin Luther University Halle-Wittenberg, 06112, Halle (Saale), Germany
| | - Virginie Dubourg
- Julius-Bernstein-Institute of Physiology, Martin Luther University Halle-Wittenberg, 06112, Halle (Saale), Germany
| | - Barbara Schreier
- Julius-Bernstein-Institute of Physiology, Martin Luther University Halle-Wittenberg, 06112, Halle (Saale), Germany
| | - Wolfgang Sippl
- Institute of Pharmacy, Department of Medical Chemistry, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Ralf Benndorf
- Institute of Pharmacy, Department of Clinical Pharmacy and Pharmacotherapy, Martin Luther University Halle-Wittenberg, Halle, Germany
- Institute of Pharmacology and Toxicology, Ruhr-University Bochum, 44780, Bochum, Germany
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2
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Oszwald A, Mejía-Pedroza RA, Schachner H, Aigner C, Rees A, Kain R. Digital Spatial Profiling of Glomerular Gene Expression in Pauci-Immune Focal Necrotizing Glomerulonephritis. KIDNEY360 2023; 4:83-91. [PMID: 36700908 PMCID: PMC10101620 DOI: 10.34067/kid.000461202] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 11/09/2022] [Indexed: 01/27/2023]
Abstract
Pauci-immune focal necrotizing glomerulonephritis (piFNGN) involves asynchronous onset and progression of injurious lesions in biopsies. Pathologists can describe this heterogeneity within a biopsy, but translating the information into prognostic or expression analyses is challenging. Understanding the underlying molecular processes could improve treatment; however, bulk or single-cell transcriptomic analyses of dissociated tissue disregard the heterogeneity of glomerular injury. We characterize protein and mRNA expression of individual glomeruli in 20 biopsies from 18 patients with antineutrophil cytoplasmic antibody-associated piFNGN using the NanoString digital spatial profiling (DSP) platform. For this purpose, circular annotations of glomeruli were analyzed using protein, immuno-oncology RNA, and Cancer Transcriptome Atlas panels (n=120, 72, and 48 glomeruli, respectively). Histologic evaluation of glomerular patterns of injury was performed in adjacent serial sections. Expression data were processed by log2 transformation, quantile normalization, and batch adjustment. DSP revealed distinct but overlapping gene expression profiles relating to the morphological evolution of injurious lesions, including dynamic expression of various immune checkpoint regulators. Enrichment analysis indicated deregulated pathways that underline known and highlight novel potential mechanisms of disease. Moreover, by capturing individual glomeruli, DSP describes heterogeneity between and within biopsies. We demonstrate the benefit of spatial profiling for characterization of heterogeneous glomerular injury, indicating novel molecular correlates of glomerular injury in piFNGN.
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Affiliation(s)
- André Oszwald
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | | | - Helga Schachner
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | - Christof Aigner
- Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Andrew Rees
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | - Renate Kain
- Department of Pathology, Medical University of Vienna, Vienna, Austria
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Deshpande A, Shetty PMV, Frey N, Rangrez AY. SRF: a seriously responsible factor in cardiac development and disease. J Biomed Sci 2022; 29:38. [PMID: 35681202 PMCID: PMC9185982 DOI: 10.1186/s12929-022-00820-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 05/27/2022] [Indexed: 11/10/2022] Open
Abstract
The molecular mechanisms that regulate embryogenesis and cardiac development are calibrated by multiple signal transduction pathways within or between different cell lineages via autocrine or paracrine mechanisms of action. The heart is the first functional organ to form during development, which highlights the importance of this organ in later stages of growth. Knowledge of the regulatory mechanisms underlying cardiac development and adult cardiac homeostasis paves the way for discovering therapeutic possibilities for cardiac disease treatment. Serum response factor (SRF) is a major transcription factor that controls both embryonic and adult cardiac development. SRF expression is needed through the duration of development, from the first mesodermal cell in a developing embryo to the last cell damaged by infarction in the myocardium. Precise regulation of SRF expression is critical for mesoderm formation and cardiac crescent formation in the embryo, and altered SRF levels lead to cardiomyopathies in the adult heart, suggesting the vital role played by SRF in cardiac development and disease. This review provides a detailed overview of SRF and its partners in their various functions and discusses the future scope and possible therapeutic potential of SRF in the cardiovascular system.
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Affiliation(s)
- Anushka Deshpande
- Department of Internal Medicine III, Cardiology and Angiology, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany.,Department of Cardiology, Angiology and Pneumology, University Hospital Heidelberg, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research), Partner site Hamburg/Kiel/Lübeck, Kiel, Germany
| | - Prithviraj Manohar Vijaya Shetty
- Department of Cardiology, Angiology and Pneumology, University Hospital Heidelberg, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
| | - Norbert Frey
- Department of Cardiology, Angiology and Pneumology, University Hospital Heidelberg, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
| | - Ashraf Yusuf Rangrez
- Department of Cardiology, Angiology and Pneumology, University Hospital Heidelberg, Heidelberg, Germany. .,DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany.
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4
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Yu R, Zhang Y, Lu Z, Li J, Shi P, Li J. Long-chain non-coding RNA UCA1 inhibits renal tubular epithelial cell apoptosis by targeting microRNA-206 in diabetic nephropathy. Arch Physiol Biochem 2022; 128:231-239. [PMID: 31608712 DOI: 10.1080/13813455.2019.1673431] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In this study, the inhibitory effect of long-chain non-coding RNA urothelial carcinoma associated 1 (UCA1) on renal tubular epithelial cell apoptosis by targeting microRNA (miRNA)-206 in diabetic nephropathy (DN) was investigated through DN rat model. The results showed that UCA1 expression was significantly reduced in diabetic renal tubular epithelial tissues and HG-induced HK-2 cells. UCA1 significantly inhibited HG-induced apoptosis and inflammation of renal tubular epithelial cells in HK-2 cells. In addition, UCA1 can directly act as an anti-pro-cytokine by inhibiting the expression of miR-206, and finally inhibit the apoptosis and inflammation of renal tubular epithelial cells. We conclude that UCA1 inhibits renal tubular epithelial cell apoptosis by targeting miRNA-206 in DN and can be used as a potential therapeutic target for DN.
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Affiliation(s)
- Rucui Yu
- Department of Traditional Chinese Medicine, Division of Life Sciences and Medicine, The First Affiliated Hospital of USTC, University of Science and Technology of China, Hefei, PR China
| | - Yan Zhang
- Anorectal Department of the 105 Hospital of People's Liberation Army, Hefei, PR China
| | - Zhihui Lu
- Department of Traditional Chinese Medicine, Division of Life Sciences and Medicine, The First Affiliated Hospital of USTC, University of Science and Technology of China, Hefei, PR China
| | - Jinhu Li
- Department of Traditional Chinese Medicine, Division of Life Sciences and Medicine, The First Affiliated Hospital of USTC, University of Science and Technology of China, Hefei, PR China
| | - Peng Shi
- Department of Neurology, First Affiliated Hospital of Bengbu Medical College, Bengbu, PR China
| | - Jianming Li
- Department of Nephrology, Beijing Hospital of Chinese Traditional and Western Medicine, Beijing, PR China
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Liu T, Chen J, Ying Y, Shi L, Chen Z. Inhibitory Effect of Gliquidone on Epithelial-to-Mesenchymal-Transition of Renal Tubular Epithelial Cells Under Diabetic Nephropathy Mouse Model. J BIOMATER TISS ENG 2022. [DOI: 10.1166/jbt.2022.2870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This research aimed to study the inhibitory effect of Glurenorm (gliquidone) on epithelial-to-mesenchymal-transition (EMT) of renal tubular epithelial cells based on the diabetic nephropathy (DN) model. In this study, 30 specific pathogen-free (SPF) mice were selected to construct DN
model and randomly rolled into groups A, B, and C, with 10 mice in each group. Low-dose, mediumdose, and high-dose Glurenorm were administered intragastrically. The results showed that the serum urea nitrogen content (7.23±0.39 mmol/L, 6.18±0.46 mmol/L) of control and C group
was considerably inferior to A group (8.01±0.48 mmol/L), and the content of C group was greatly lower than controls (P < 0.05). The creatinine clearance rate (2.97±0.44 mL/min, 4.02±0.31 mL/min) of mice in control and C group was notably superior to A group (2.18±0.38
mL/min), and that of C group was obviously higher versus controls (P < 0.05). After 5 weeks of intragastric intervention by Glurenorm, the body mass of the mice in control and C group was evidently lower relative to A group, and that of C group was obviously higher versus controls
(P < 0.05). Mice in control and C group were remarkably lower in body mass at the 7th week after Glurenorm intervention versus A group, and C group was relatively lower versus controls (P < 0.05). In short, EMT played an important role in promoting the occurrence and progression
of renal fibrosis. Glurenorm can reduce the progression of renal fibrosis, inhibit EMT of renal tubular epithelial cells, and effectively protect kidney function.
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Affiliation(s)
- Ting Liu
- Department of Nephrology, Ningbo Urology and Nephrology Hospital, Ningbo, 315000, Zhejiang, China
| | - Jie Chen
- Department of Nephrology, Ningbo Urology and Nephrology Hospital, Ningbo, 315000, Zhejiang, China
| | - Yiying Ying
- Department of Nephrology, Ningbo Urology and Nephrology Hospital, Ningbo, 315000, Zhejiang, China
| | - Ling Shi
- Department of Nephrology, Ningbo Urology and Nephrology Hospital, Ningbo, 315000, Zhejiang, China
| | - Zhengyue Chen
- Department of Nephrology, Ningbo Urology and Nephrology Hospital, Ningbo, 315000, Zhejiang, China
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Joshi H, Vastrad B, Joshi N, Vastrad C. Integrated bioinformatics analysis reveals novel key biomarkers in diabetic nephropathy. SAGE Open Med 2022; 10:20503121221137005. [PMID: 36385790 PMCID: PMC9661593 DOI: 10.1177/20503121221137005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 10/18/2022] [Indexed: 11/13/2022] Open
Abstract
Objectives: The underlying molecular mechanisms of diabetic nephropathy have yet not been investigated clearly. In this investigation, we aimed to identify key genes involved in the pathogenesis and prognosis of diabetic nephropathy. Methods: We downloaded next-generation sequencing data set GSE142025 from Gene Expression Omnibus database having 28 diabetic nephropathy samples and nine normal control samples. The differentially expressed genes between diabetic nephropathy and normal control samples were analyzed. Biological function analysis of the differentially expressed genes was enriched by Gene Ontology and REACTOME pathways. Then, we established the protein–protein interaction network, modules, miRNA-differentially expressed gene regulatory network and transcription factor-differentially expressed gene regulatory network. Hub genes were validated by using receiver operating characteristic curve analysis. Results: A total of 549 differentially expressed genes were detected including 275 upregulated and 274 downregulated genes. The biological process analysis of functional enrichment showed that these differentially expressed genes were mainly enriched in cell activation, integral component of plasma membrane, lipid binding, and biological oxidations. Analyzing the protein–protein interaction network, miRNA-differentially expressed gene regulatory network and transcription factor-differentially expressed gene regulatory network, we screened hub genes MDFI, LCK, BTK, IRF4, PRKCB, EGR1, JUN, FOS, ALB, and NR4A1 by the Cytoscape software. The receiver operating characteristic curve analysis confirmed that hub genes were of diagnostic value. Conclusions: Taken above, using integrated bioinformatics analysis, we have identified key genes and pathways in diabetic nephropathy, which could improve our understanding of the cause and underlying molecular events, and these key genes and pathways might be therapeutic targets for diabetic nephropathy.
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Affiliation(s)
- Harish Joshi
- Endocrine and Diabetes Care Center, Hubbali, India
| | - Basavaraj Vastrad
- Department of Pharmaceutical Chemistry, KLE Society’s College of Pharmacy, Gadag, India
| | - Nidhi Joshi
- Dr. D. Y. Patil Medical College, Kolhapur, India
| | - Chanabasayya Vastrad
- Biostatistics and Bioinformatics, Chanabasava Nilaya, Dharwad, India
- Chanabasayya Vastrad, Biostatistics and Bioinformatics, Chanabasava Nilaya, Bharthinagar, Dharwad 580001, India.
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7
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Zhao L, Li C, Guan C, Song N, Luan H, Luo C, Jiang W, Bu Q, Wang Y, Che L, Xu Y. Serum response factor, a novel early diagnostic biomarker of acute kidney injury. Aging (Albany NY) 2021; 13:2885-2894. [PMID: 33406503 PMCID: PMC7880358 DOI: 10.18632/aging.202381] [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: 06/15/2020] [Accepted: 10/31/2020] [Indexed: 12/29/2022]
Abstract
Objective: Studies have shown that serum response factor (SRF) is increased in chronic kidney injury, such as diabetic nephropathy, hyperuricemic nephropathy and renal cell carcinoma. The objective is to explore the early diagnostic value of SRF in acute kidney injury (AKI). Methods: AKI-related microarray data were analyzed, and the expression and location of SRF were investigated in the early phase of AKI. Results: Bioinformatics results demonstrated that SRF was dramatically elevated 2-4 h after ischemia/reperfusion (I/R) in mouse renal tissue. In I/R rats, SRF was mostly expressed and located in renal tubular epithelial cells (TECs). SRF started to increase at 1 h, peaked at 3-9 h and started to decrease at 12 h after I/R. The areas under the ROC curve of renal SRF mRNA, renal SRF protein, urinary SRF, serum SRF and serum creatinine (Scr) were 87.9%, 83.0%, 81.3%, 78.8%, 68.8%, respectively. Conclusion: SRF is remarkably upregulated in early (before 24 h) AKI and can replace Scr as a potential new early diagnostic biomarker of AKI.
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Affiliation(s)
- Long Zhao
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Chenyu Li
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Chen Guan
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Ning Song
- Department of Obstetrics, Weifang People's Hospital, Weifang 261041, China
| | - Hong Luan
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Congjuan Luo
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Wei Jiang
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Quandong Bu
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Yanfei Wang
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Lin Che
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Yan Xu
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
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8
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Zhao L, Li C, Jiang W, Luan H, Zhao J, Zhang J, Xu Y. Serum response factor increases renal cell carcinoma migration and invasion through promoting epithelial-mesenchymal transition. Int J Urol 2020; 27:808-816. [PMID: 32524697 DOI: 10.1111/iju.14275] [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: 02/06/2020] [Accepted: 04/29/2020] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To explore the regulation and function of serum response factor in epithelial-mesenchymal transition in renal cell carcinoma. METHODS First, bioinformatics analysis of human renal cell carcinoma tissues was carried out. Then, the expression of serum response factor, mesenchymal markers (N-cadherin, vimentin and fibronectin) and epithelial markers (zonula occludens-1 and epithelial cadherin) was examined in 786-O cells (a human renal cell carcinoma cell line). Serum response factor was overexpressed with pcDNA-serum response factor plasmid, and suppressed by CCG-1423 (a small molecule inhibitor of serum response factor) to study how serum response factor affects epithelial-mesenchymal transition in renal cell carcinoma. A xenograft nude mouse model was established to explore whether serum response factor affected the tumorigenic ability of renal cell carcinoma cells. RESULTS Serum response factor interacted with several important differentially expressed genes in renal cell carcinoma. In 786-O cells, serum response factor, N-cadherin, vimentin and fibronectin were upregulated, whereas zonula occludens-1 and epithelial cadherin were downregulated. Serum response factor upregulation in 786-O cells increased the Snail expression. Serum response factor suppression reduced Snail induction, and migration and invasion in renal cell carcinoma, which decreased the xenograft tumor volume. CONCLUSIONS Serum response factor is a critical transcription factor in human renal cell carcinoma. Increased serum response factor activity induces epithelial-mesenchymal transition, migration and invasion in 786-O cells, and facilitates the progression of renal cell carcinoma. Targeting serum response factor with CCG-1423 might be an attractive therapeutic strategy for renal cell carcinoma.
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Affiliation(s)
- Long Zhao
- Departments of, Department of, Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Chenyu Li
- Departments of, Department of, Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Wei Jiang
- Departments of, Department of, Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Hong Luan
- Departments of, Department of, Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Jun Zhao
- Department of, Nephrology, Weifang People's Hospital, Weifang, China
| | - Jiaxin Zhang
- Department of, Breast Surgery, Weifang People's Hospital, Weifang, China
| | - Yan Xu
- Departments of, Department of, Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao, China
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9
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Caven L, Carabeo RA. Pathogenic Puppetry: Manipulation of the Host Actin Cytoskeleton by Chlamydia trachomatis. Int J Mol Sci 2019; 21:ijms21010090. [PMID: 31877733 PMCID: PMC6981773 DOI: 10.3390/ijms21010090] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 12/18/2019] [Accepted: 12/19/2019] [Indexed: 12/25/2022] Open
Abstract
The actin cytoskeleton is crucially important to maintenance of the cellular structure, cell motility, and endocytosis. Accordingly, bacterial pathogens often co-opt the actin-restructuring machinery of host cells to access or create a favorable environment for their own replication. The obligate intracellular organism Chlamydia trachomatis and related species exemplify this dynamic: by inducing actin polymerization at the site of pathogen-host attachment, Chlamydiae induce their own uptake by the typically non-phagocytic epithelium they infect. The interaction of chlamydial adhesins with host surface receptors has been implicated in this effect, as has the activity of the chlamydial effector TarP (translocated actin recruitment protein). Following invasion, C. trachomatis dynamically assembles and maintains an actin-rich cage around the pathogen’s membrane-bound replicative niche, known as the chlamydial inclusion. Through further induction of actin polymerization and modulation of the actin-crosslinking protein myosin II, C. trachomatis promotes egress from the host via extrusion of the inclusion. In this review, we present the experimental findings that can inform our understanding of actin-dependent chlamydial pathogenesis, discuss lingering questions, and identify potential avenues of future study.
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Affiliation(s)
- Liam Caven
- School of Molecular Biosciences, Washington State University, Pullman, WA 99164, USA;
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198-5900, USA
| | - Rey A. Carabeo
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198-5900, USA
- Correspondence: ; Tel.: +1-402-836-9778
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Zhao L, Li C, Zhou B, Luo C, Wang Y, Che L, Zhao J, Xu Y. Crucial role of serum response factor in renal tubular epithelial cell epithelial-mesenchymal transition in hyperuricemic nephropathy. Aging (Albany NY) 2019; 11:10597-10609. [PMID: 31774735 PMCID: PMC6914413 DOI: 10.18632/aging.102479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Accepted: 11/08/2019] [Indexed: 11/29/2022]
Abstract
Objective: To explore the regulation and function of serum response factor (SRF) in epithelial-mesenchymal transition (EMT) in renal tubular epithelial cells (TECs) in hyperuricemic nephropathy (HN). Results: In NRK-52E cells treated with UA and renal medulla tissue samples from hyperuricemic rats, SRF, fibronectin, α-SMA and FSP-1 expression was upregulated, while ZO-1 and E-cadherin expression was downregulated. SRF upregulation in NRK-52E cells increased slug expression. Blockade of SRF by an SRF-specific siRNA or CCG-1423 reduced slug induction and protected TECs from undergoing EMT both in vitro and in vivo. Conclusion: Increased SRF activity promotes EMT and dysfunction in TECs in HN. Targeting SRF with CCG-1423 may be an attractive therapeutic strategy in HN. Methods: The expression of SRF, mesenchymal markers (fibronectin, α-SMA, and FSP-1), epithelial markers (ZO-1 and E-cadherin) and was examined in rat renal TECs (NRK-52E cells) or renal medulla tissue samples following uric acid (UA) treatment. SRF overexpressed with pcDNA-SRF plasmid and suppressed by CCG-1423 (a small molecule inhibitor of SRF) to study how SRF influences EMT in TECs in HN. Oxonic acid (OA) was used to establish HN in rats.
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Affiliation(s)
- Long Zhao
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Chenyu Li
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Bin Zhou
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Congjuan Luo
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Yanfei Wang
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Lin Che
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
| | - Jun Zhao
- Department of Nephrology, Shandong Weifang People's Hospital, Weifang 261041, China
| | - Yan Xu
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
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11
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Epigenetic activation of CTGF transcription by high glucose in renal tubular epithelial cells is mediated by myocardin-related transcription factor A. Cell Tissue Res 2019; 379:549-559. [PMID: 31773302 DOI: 10.1007/s00441-019-03124-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 10/09/2019] [Indexed: 01/26/2023]
Abstract
Diabetic nephropathy (DN) is one of the most devastating complications of diabetes. Connective tissue growth factor (CTGF) levels are up-regulated in patients with DN and in renal tubular epithelial cells (RTECs) exposed to high glucose (HG). The underlying epigenetic mechanism remains to be elucidated. In the present study, we investigate the role of myocardin-related transcription factor A (MRTF-A) in HG-induced CTGF transcription in RTECs. We report that in two different animal models of DN, one induced by streptozotocin (STZ) injection and the other induced by high-fat diet (HFD) feeding, MRTF-A deficiency attenuated CTGF induction in the kidneys. In cultured RTECs, MRTF-A knockdown similarly ameliorated CTGF induction by HG treatment. Upon CTGF induction, there was an increase in acetylated histone H3 (AcH3) and trimethylated H3K4 (H3K4Me3) on the CTGF promoter region accompanying a decrease in dimethylated H3K9 (H3K9Me2). MRTF-A ablation in vivo or depletion in vitro comparably dampened the accumulation of AcH3 and H3K4Me3 but restored H3K9Me2 on the CTGF promoter. Further analyses revealed that MRTF-A interacted with and recruited histone demethylase KDM3A to the CTGF promoter to activate transcription. KDM3A silencing equivalently weakened HG-induced CTGF induction in RTECs. In conclusion, MRTF-A contributes to HG-induced CTGF transcription via an epigenetic mechanism.
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12
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Dong Z, Sun Y, Wei G, Li S, Zhao Z. A Nucleoside/Nucleobase-Rich Extract from Cordyceps Sinensis Inhibits the Epithelial-Mesenchymal Transition and Protects against Renal Fibrosis in Diabetic Nephropathy. Molecules 2019; 24:E4119. [PMID: 31739543 PMCID: PMC6891521 DOI: 10.3390/molecules24224119] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 02/07/2023] Open
Abstract
Cordyceps Sinensis, a traditional Chinese medicine and a healthy food, has been used for the treatment of kidney disease for a long time. The aim of present study was to isolate a nucleoside/nucleobase-rich extract from Cordyceps Sinensis (CS-N), determine the contents of nucleosides and nucleobases, and explore its anti-diabetic nephropathy activity. CS-N was isolated and purified by using microporous resin and glucan columns and the unknown compounds were identified by using HPLC-DAD and LC-MS. The effects of CS-N on the epithelial-mesenchymal transition (EMT), extracellular matrix (ECM) depositions, and the MAPK signaling pathway were evaluated in streptozotocin (STZ)-induced diabetic mice and high glucose (HG)-exposed HK-2 cells. CS-N significantly attenuated the abnormity of renal functional parameters, ameliorated histopathological changes, and inhibited EMT and ECM accumulation by regulating p38/ERK signaling pathways. Our findings indicate that CS-N exerts a therapeutic effect on experimental diabetic renal fibrosis by mitigating the EMT and the subsequent ECM deposition with inhibition of p38 and ERK signaling pathways.
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Affiliation(s)
- Zhonghua Dong
- School of Pharmaceutical Sciences, Shandong University, 44 West Wenhua Road, Jinan 250012, China; (Z.D.); (Y.S.)
| | - Yueyue Sun
- School of Pharmaceutical Sciences, Shandong University, 44 West Wenhua Road, Jinan 250012, China; (Z.D.); (Y.S.)
| | - Guangwei Wei
- School of Basic Medical Sciences, Shandong University, 44 West Wenhua Road, Jinan 250012, China;
| | - Siying Li
- School of Basic Medical Sciences, Shandong University, 44 West Wenhua Road, Jinan 250012, China;
| | - Zhongxi Zhao
- School of Pharmaceutical Sciences, Shandong University, 44 West Wenhua Road, Jinan 250012, China; (Z.D.); (Y.S.)
- Shandong Engineering & Technology Research Center for Jujube Food and Drug, 44 West Wenhua Road, Jinan 250012, China
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13
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Guo Q, Zhong W, Duan A, Sun G, Cui W, Zhuang X, Liu L. Protective or deleterious role of Wnt/beta-catenin signaling in diabetic nephropathy: An unresolved issue. Pharmacol Res 2019; 144:151-157. [PMID: 30935943 DOI: 10.1016/j.phrs.2019.03.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 02/26/2019] [Accepted: 03/25/2019] [Indexed: 12/16/2022]
Abstract
In recent years, the Wnt/β-catenin signaling has gained tremendous attention due to its ability to modulate a number of diseases including diabetic nephropathy. Studies have shown that there is decrease in the secretion of Wnt proteins including Wnt4, 5a and Wnt 6 during high glucose concentration or diabetic conditions, which leads to decreased translocation of β-catenin to nucleus. The down-regulation of Wnt/β-catenin signaling leads to detrimental effects on kidney including increased apoptosis of mesangial cells and increased deposition of fibrous tissue in mesangium. The pharmacological modulators such as spironolactone, NO donor and antioxidant are shown to produce beneficial effects in diabetic nephropathy by up regulating the expression of Wnt proteins and activation of diabetes-induced suppressed Wnt/β-catenin signaling. On the other hand, it is documented that diabetes leads to overactivation of Wnt1/β-catenin signaling, which promotes podocyte injury, induce epithelial-mesenchymal transition of podocytes along with renal injury and fibrosis. Accordingly, different interventions aimed to suppress overactivated Wnt/β-catenin signaling are reported to improve the condition and symptoms associated with diabetic nephropathy. The present review discusses the dual role of Wnt/beta-catenin signaling in the pathogenesis of diabetic nephropathy.
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Affiliation(s)
- Qiaoyan Guo
- Department of Nephrology, The Second Hospital of Jilin University, Changchun, 130041, China.
| | - Wei Zhong
- Department of Ophthalmology, The China-Japan Union Hospital of Jilin University, Changchun, 130033, China.
| | - Aosong Duan
- Department of Intensive Care Unit, The First Hospital of Jilin University, Changchun, 130021,China.
| | - Guanggong Sun
- Department of Nephrology, The Second Hospital of Jilin University, Changchun, 130041, China.
| | - Wenpeng Cui
- Department of Nephrology, The Second Hospital of Jilin University, Changchun, 130041, China.
| | - Xiaohua Zhuang
- Department of Nephrology, The Second Hospital of Jilin University, Changchun, 130041, China.
| | - Lihua Liu
- Department of Nephrology, The Second Hospital of Jilin University, Changchun, 130041, China.
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14
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Chen YZ, Sun DQ, Zheng Y, Zheng GK, Chen RQ, Lin M, Huang LF, Huang C, Song D, Wu BQ. WISP1 silencing confers protection against epithelial-mesenchymal transition of renal tubular epithelial cells in rats via inactivation of the wnt/β-catenin signaling pathway in uremia. J Cell Physiol 2018; 234:9673-9686. [PMID: 30556898 DOI: 10.1002/jcp.27654] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 09/29/2018] [Accepted: 10/02/2018] [Indexed: 12/30/2022]
Abstract
Uremia can affect hepatic metabolism of drugs by regulating the clearance of drugs, but it has not been clarified whether gene silencing could modulate the epithelial-mesenchymal transition (EMT) process in uremia. Hence, we investigated the effect of WISP1 gene silencing on the renal tubular EMT in uremia through the wnt/β-catenin signaling pathway. Initially, microarray-based gene expression profiling of uremia was used to identify differentially expressed genes. Following the establishment of uremia rat model, serum creatinine, and urea nitrogen of rats were detected. Renal tubular epithelial cells (TECs) were transfected with shRNA-WISP1 lentivirus interference vectors and LiCI (the wnt/β-catenin signaling pathway activator) to explore the regulatory mechanism of WISP1 in uremia in relation to the wnt/β-catenin signaling pathway. Then, expression of WISP1, wnt2b, E-cadherin, α-SMA, c-myc, Cyclin D1, MMP-2, and MMP-9 was determined. Furthermore, TEC migration and invasion were evaluated. Results suggested that WISP1 and the wnt/β-catenin signaling pathway were associated with uremia. Uremic rats exhibited increased serum creatinine and urea nitrogen levels, upregulated WISPl, and activated wnt/β-catenin signaling pathway. Subsequently, WISP1 silencing decreased wnt2b, c-myc, Cyclin D1, α-SMA, MMP-2, and MMP-9 expression but increased E-cadherin expression, whereas LiCI treatment exhibited the opposite trends. In addition, WISP1 silencing suppressed TEC migration and invasion, whereas LiCI treatment promoted TEC migration and invasion. The findings indicate that WISP1 gene silencing suppresses the activation of the wnt/β-catenin signaling pathway, thus reducing EMT of renal TECs in uremic rats.
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Affiliation(s)
- Yuan-Zhen Chen
- Department of Nephrology, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Dan-Qin Sun
- Department of Nephrology, Wuxi No. 2 People's Hospital, Nanjing Medical University, Wuxi, China
| | - Yi Zheng
- Central Laboratory, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China.,Central Laboratory, Huadu District People's Hospital, Southern Medical University, Guangzhou, China
| | - Guang-Kuai Zheng
- Department of Nephrology, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Rong-Quan Chen
- Department of Nephrology, Wuxi No. 2 People's Hospital, Nanjing Medical University, Wuxi, China
| | - Mei Lin
- Department of Nephrology, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Lian-Fang Huang
- Department of Nephrology, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Cong Huang
- Department of Nephrology, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Dan Song
- Department of Nephrology, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Ben-Qing Wu
- Children's Medical Center, University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
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15
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Ma L, Yu Y, Qu X. Suppressing serum response factor inhibits invasion in cervical cancer cell lines via regulating Egr‑1 and epithelial-mesenchymal transition. Int J Mol Med 2018; 43:614-620. [PMID: 30365040 DOI: 10.3892/ijmm.2018.3954] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 09/27/2018] [Indexed: 11/06/2022] Open
Abstract
Serum response factor (SRF) is a transcription factor that has important roles in tumor progression. However, its role in cervical cancer cell proliferation and invasion remains unclear. The present study revealed that SRF silencing constrained cervical cancer cell proliferation and invasion via controlling early growth response‑1 (Egr‑1). The results demonstrated that SRF was significantly increased in cervical cancer tissues and cell lines, compared with normal. Suppressing SRF, by using a loss‑of‑function experiment, constrained cervical cancer cell proliferation, invasion, and epithelial‑mesenchymal transition. Furthermore, SRF knockdown significantly downregulated Egr‑1 expression in cervical cancer cell lines, and overexpression of Egr‑1 reversed the effect of SRF on cell proliferation, invasion, and epithelial‑mesenchymal transition. Therefore, SRF may control cell proliferation and invasion by regulating Egr‑1 in cervical cancer.
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Affiliation(s)
- Liya Ma
- Clinical Skills Training Center, Henan University of Chinese Medicine, Zhengzhou, Henan 450046, P.R. China
| | - Ying Yu
- Perinatal Care Division, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing 100026, P.R. China
| | - Xiaohui Qu
- Obstetrics and Gynecology, Second Affiliated Hospital of Shaanxi University of Chinese Medicine, Xianyang, Shaanxi 712000, P.R. China
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16
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Li SS, He AL, Deng ZY, Liu QF. Ginsenoside-Rg1 Protects against Renal Fibrosis by Regulating the Klotho/TGF-β1/Smad Signaling Pathway in Rats with Obstructive Nephropathy. Biol Pharm Bull 2018; 41:585-591. [DOI: 10.1248/bpb.b17-00934] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Sha-sha Li
- Clinical Research & Lab Centre, Kunshan First People’s Hospital Affiliated to Jiangsu University
| | - Ao-lin He
- Clinical Research & Lab Centre, Kunshan First People’s Hospital Affiliated to Jiangsu University
| | - Zhi-yong Deng
- Department of Pathology, Kunshan First People’s Hospital Affiliated to Jiangsu University
| | - Qi-feng Liu
- Department of Nephrology, Kunshan First People’s Hospital Affiliated to Jiangsu University
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17
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Guo B, Lyu Q, Slivano OJ, Dirkx R, Christie CK, Czyzyk J, Hezel AF, Gharavi AG, Small EM, Miano JM. Serum Response Factor Is Essential for Maintenance of Podocyte Structure and Function. J Am Soc Nephrol 2017; 29:416-422. [PMID: 29114040 DOI: 10.1681/asn.2017050473] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 10/11/2017] [Indexed: 01/15/2023] Open
Abstract
Podocytes contain an intricate actin cytoskeleton that is essential for the specialized function of this cell type in renal filtration. Serum response factor (SRF) is a master transcription factor for the actin cytoskeleton, but the in vivo expression and function of SRF in podocytes are unknown. We found that SRF protein colocalizes with podocyte markers in human and mouse kidneys. Compared with littermate controls, mice in which the Srf gene was conditionally inactivated with NPHS2-Cre exhibited early postnatal proteinuria, hypoalbuminemia, and azotemia. Histologic changes in the mutant mice included glomerular capillary dilation and mild glomerulosclerosis, with reduced expression of multiple canonical podocyte markers. We also noted tubular dilation, cell proliferation, and protein casts as well as reactive changes in mesangial cells and interstitial inflammation. Ultrastructure analysis disclosed foot process effacement with loss of slit diaphragms. To ascertain the importance of SRF cofactors in podocyte function, we disabled the myocardin-related transcription factor A and B genes. Although loss of either SRF cofactor alone had no observable effect in the kidney, deficiency of both recapitulated the Srf-null phenotype. These results establish a vital role for SRF and two SRF cofactors in the maintenance of podocyte structure and function.
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Affiliation(s)
- Bing Guo
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York.,Department of Hepatobiliary Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qing Lyu
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Orazio J Slivano
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Ronald Dirkx
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Christine K Christie
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Jan Czyzyk
- Department of Pathology and Laboratory Medicine and
| | - Aram F Hezel
- James P. Wilmot Cancer Center, University of Rochester School of Medicine and Dentistry, Rochester, New York; and
| | - Ali G Gharavi
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York
| | - Eric M Small
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Joseph M Miano
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York;
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18
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Abstract
Protein function can be regulated via post-translational modifications by numerous enzymatic and non-enzymatic mechanisms, including oxidation of cysteine and methionine residues. Redox-dependent regulatory mechanisms have been identified for nearly every cellular process, but the major paradigm has been that cellular components are oxidized (damaged) by reactive oxygen species (ROS) in a relatively unspecific way, and then reduced (repaired) by designated reductases. While this scheme may work with cysteine, it cannot be ascribed to other residues, such as methionine, whose reaction with ROS is too slow to be biologically relevant. However, methionine is clearly oxidized in vivo and enzymes for its stereoselective reduction are present in all three domains of life. Here, we revisit the chemistry and biology of methionine oxidation, with emphasis on its generation by enzymes from the monooxygenase family. Particular attention is placed on MICALs, a recently discovered family of proteins that harbor an unusual flavin-monooxygenase domain with an NADPH-dependent methionine sulfoxidase activity. Based on structural and kinetic information we provide a rational framework to explain MICAL mechanism, inhibition, and regulation. Methionine residues that are targeted by MICALs are reduced back by methionine sulfoxide reductases, suggesting that reversible methionine oxidation may be a general mechanism analogous to the regulation by phosphorylation by kinases/phosphatases. The identification of new enzymes that catalyze the oxidation of methionine will open a new area of research at the forefront of redox signaling.
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Affiliation(s)
- Bruno Manta
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Vadim N Gladyshev
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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19
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Lan X, Wen H, Cheng K, Plagov A, Marashi Shoshtari SS, Malhotra A, Singhal PC. Hedgehog pathway plays a vital role in HIV-induced epithelial-mesenchymal transition of podocyte. Exp Cell Res 2017; 352:193-201. [PMID: 28159470 DOI: 10.1016/j.yexcr.2017.01.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 01/25/2017] [Accepted: 01/29/2017] [Indexed: 11/28/2022]
Abstract
HIV-associated nephropathy (HIVAN) is characterized by heavy proteinuria, rapidly progressive renal failure, and distinct morphological features in the kidney. HIV-induced epithelial-mesenchymal transition (EMT) is critically important for the progression of kidney injury. In this study, we tested the role of hedgehog pathway in the HIV-induced EMT and fibrosis of kidney. We used the Tg26 mice, the abundantly used HIVAN mouse model, to investigate the activation of hedgehog pathway by HIV. Western blotting and real time PCR results showed that renal tissue expression of hedgehog pathway related molecules, including hedgehog homologous (Shh, Ihh, Dhh), PTCH, and Gli1, were increased in HIVAN (Tg26) mice; while immunofluorescent staining displayed localization PTCH expression in podocytes. For in vitro studies, we used recombinant sonic hedgehog (Shh) and HIV for their expression by podocytes. Both the methods activated the hedgehog pathway, enhanced the expression of EMT markers, and decreased impermeability. Overexpression of Gli1 by human podocytes also augmented their expression of EMT markers. On the other hand, the blockade of hedgehog pathway with Gant 58, a specific blocker for Gli1-induced transcription, dramatically decreased HIV-induced podocyte EMT and permeability. These results indicate that hedgehog pathway plays an important role in HIV-induced podocyte injury. The present study provides mechanistical insight into a new target for therapeutic strategy.
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Affiliation(s)
- Xiqian Lan
- Renal Molecular Research Laboratory, Feinstein Institute for Medical Research, Hofstra Northwell Medical School, NY, USA.
| | - Hongxiu Wen
- Renal Molecular Research Laboratory, Feinstein Institute for Medical Research, Hofstra Northwell Medical School, NY, USA
| | - Kang Cheng
- Renal Molecular Research Laboratory, Feinstein Institute for Medical Research, Hofstra Northwell Medical School, NY, USA
| | - Andrei Plagov
- Renal Molecular Research Laboratory, Feinstein Institute for Medical Research, Hofstra Northwell Medical School, NY, USA
| | | | - Ashwani Malhotra
- Renal Molecular Research Laboratory, Feinstein Institute for Medical Research, Hofstra Northwell Medical School, NY, USA
| | - Pravin C Singhal
- Renal Molecular Research Laboratory, Feinstein Institute for Medical Research, Hofstra Northwell Medical School, NY, USA.
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20
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Pontrelli P, Conserva F, Papale M, Oranger A, Barozzino M, Vocino G, Rocchetti MT, Gigante M, Castellano G, Rossini M, Simone S, Laviola L, Giorgino F, Grandaliano G, Di Paolo S, Gesualdo L. Lysine 63 ubiquitination is involved in the progression of tubular damage in diabetic nephropathy. FASEB J 2016; 31:308-319. [PMID: 27881486 DOI: 10.1096/fj.201600382rr] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 09/28/2016] [Indexed: 01/15/2023]
Abstract
The purpose of our study was to evaluate how hyperglycemia (HG) influences Lys63 protein ubiquitination and its involvement in tubular damage and fibrosis in diabetic nephropathy (DN). Gene and protein expression of UBE2v1, a ubiquitin-conjugating E2-enzyme variant that mediates Lys63-linked ubiquitination, and Lys63-ubiquitinated proteins increased in HK2 tubular cells under HG. Matrix-assisted laser desorption/ionization-time of flight/tandem mass spectrometry identified 30 Lys63-ubiquitinated proteins, mainly involved in cellular organization, such as β-actin, whose Lys63 ubiquitination increased under HG, leading to cytoskeleton disorganization. This effect was reversed by the inhibitor of the Ubc13/UBE2v1 complex NSC697923. Western blot analysis confirmed that UBE2v1 silencing in HK2 under HG, restored Lys63-β-actin ubiquitination levels to the basal condition. Immunohistochemistry on patients with type 2 diabetic (T2D) revealed an increase in UBE2v1- and Lys63-ubiquitinated proteins, particularly in kidneys of patients with DN compared with control kidneys and other nondiabetic renal diseases, such as membranous nephropathy. Increased Lys63 ubiquitination both in vivo in patients with DN and in vitro, correlated with α-SMA expression, whereas UBE2v1 silencing reduced HG-induced α-SMA protein levels, returning them to basal expression. In conclusion, UBE2v1- and Lys63-ubiquitinated proteins increase in vitro under HG, as well as in vivo in T2D, is augmented in patients with DN, and may affect cytoskeleton organization and influence epithelial-to-mesenchymal transition. This process may drive the progression of tubular damage and interstitial fibrosis in patients with DN.-Pontrelli, P., Conserva, F., Papale, M., Oranger, A., Barozzino, M., Vocino, G., Rochetti, M. T., Gigante, M., Castellano, G., Rossini, M., Simone, S., Laviola, L., Giorgino, F., Grandaliano, G., Di Paolo, S., Gesualdo, L. Lysine 63 ubiquitination is involved in the progression of tubular damage in diabetic nephropathy.
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Affiliation(s)
- Paola Pontrelli
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy;
| | - Francesca Conserva
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy.,Department of Cardiology and Cardiac Rehabilitation, Scientific Clinical Institute of Maugeri, Bari, Italy
| | - Massimo Papale
- Division of Nephrology, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
| | - Annarita Oranger
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Mariagrazia Barozzino
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Grazia Vocino
- Division of Nephrology, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
| | - Maria Teresa Rocchetti
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Margherita Gigante
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Giuseppe Castellano
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Michele Rossini
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Simona Simone
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Luigi Laviola
- Division of Endocrinology, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy; and
| | - Francesco Giorgino
- Division of Endocrinology, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy; and
| | - Giuseppe Grandaliano
- Division of Nephrology, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
| | | | - Loreto Gesualdo
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
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21
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Zhao L, Zhao J, Wang X, Chen Z, Peng K, Lu X, Meng L, Liu G, Guan G, Wang F. Serum response factor induces endothelial-mesenchymal transition in glomerular endothelial cells to aggravate proteinuria in diabetic nephropathy. Physiol Genomics 2016; 48:711-718. [PMID: 27565710 DOI: 10.1152/physiolgenomics.00082.2016] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 08/19/2016] [Indexed: 12/25/2022] Open
Abstract
We investigated the expression and function of serum response factor (SRF) in endothelial-mesenchymal transition (EndMT) in glomerular endothelial cells (GEnCs) of diabetic nephropathy (DN). The expression of SRF, endothelial markers (VE-cadherin, CD31), and mesenchymal markers (α-SMA, FSP-1, fibronectin) was examined in GEnCs following high glucose or in renal cortex tissues of DN rats. SRF was upregulated by SRF plasmids and downregulated by CCG-1423 (a small molecule inhibitor of SRF) to investigate how SRF influenced EndMT in GEnCs of DN. Streptozocin (STZ) was used to generate diabetes mellitus DM in rats. In GEnCs after high glucose treatment and in renal cortex tissues of diabetic rats, SRF, α-SMA, FSP-1, and fibronectin increased, while VE-cadherin and CD31 declined. SRF overexpression in GEnCs induced expression of Snail, an important transcription factor mediating EndMT. Blockade of SRF reduced Snail induction, protected GEnCs from EndMT, and ameliorated proteinuria. Together, increased SRF activity provokes EndMT and barrier dysfunction of GEnCs in DN. Targeting SRF by small molecule inhibitor may be an attractive therapeutic strategy for DN.
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Affiliation(s)
- Long Zhao
- Nephrology Research Institute of Shandong University, The Second Hospital of Shandong University, Shandong University, Jinan, People's Republic of China
| | - Jun Zhao
- Department of Nephrology, Shandong Weifang People's Hospital, Weifang, People's Republic of China; and
| | - Xueling Wang
- Nephrology Research Institute of Shandong University, The Second Hospital of Shandong University, Shandong University, Jinan, People's Republic of China
| | - Zhixin Chen
- Nephrology Research Institute of Shandong University, The Second Hospital of Shandong University, Shandong University, Jinan, People's Republic of China
| | - Kexin Peng
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
| | - Xiaohan Lu
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
| | - Linghang Meng
- Nephrology Research Institute of Shandong University, The Second Hospital of Shandong University, Shandong University, Jinan, People's Republic of China
| | - Gang Liu
- Nephrology Research Institute of Shandong University, The Second Hospital of Shandong University, Shandong University, Jinan, People's Republic of China
| | - Guangju Guan
- Nephrology Research Institute of Shandong University, The Second Hospital of Shandong University, Shandong University, Jinan, People's Republic of China;
| | - Fei Wang
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
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