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Yang H, Luo X, Wang X, Peng Y, Li Z, He Y, Cong J, Xie T, Zhang W. The PP2A inhibitor LB-100 mitigates lupus nephritis by suppressing tertiary lymphoid structure formation. Eur J Pharmacol 2024; 977:176703. [PMID: 38839028 DOI: 10.1016/j.ejphar.2024.176703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 05/29/2024] [Accepted: 05/30/2024] [Indexed: 06/07/2024]
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by multi-organ involvement and autoantibody production. Patients with SLE face a substantial risk of developing lupus nephritis (LN), which imposes a substantial burden on both patients and their families. Protein phosphatase 2A (PP2A) is a widely distributed serine/threonine phosphatase that participates in regulating multiple signaling pathways. Inhibition of PP2A has been implicated in the treatment of various diseases. LB-100, a small molecule inhibitor of PP2A, has demonstrated anti-tumor therapeutic effects and high safety profile in preclinical experiments. However, the role of PP2A and its inhibitor has been insufficiently studied in LN. In this study, we assessed the potential effects of LB-100 in both MRL/lpr mice and R848-induced BALB/c mice. Our findings indicated that LB-100 administration led to reduced spleen enlargement, decreased deposition of immune complexes, ameliorated renal damage, and improved kidney function in both spontaneous and R848-induced lupus mouse models. Importantly, we observed the formation of tertiary lymphoid structures (TLSs) in the kidneys of two distinct lupus mouse models. The levels of signature genes of TLS were elevated in the kidneys of lupus mice, whereas LB-100 mitigated chemokine production and inhibited TLS formation. In addition, we confirmed that inhibition or knockdown of PP2A reduced the production of T cell-related chemokines by renal tubular epithelial cells (RTEC). In summary, our study highlighted the renal protective potential of the PP2A inhibitor LB-100 in two distinct lupus mouse models, suggesting its potential as a novel strategy for treating LN and other autoimmune diseases.
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Affiliation(s)
- Hongyu Yang
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Xiaoyu Luo
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Xuan Wang
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China; Department of General Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China; National Medical Metabolomics International Collaborative Research Center, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Yi Peng
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Zhilan Li
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Yifei He
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Jing Cong
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Tingting Xie
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China; Department of General Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China; National Medical Metabolomics International Collaborative Research Center, Xiangya Hospital, Central South University, Changsha, 410008, China.
| | - Weiru Zhang
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China; Department of General Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China; National Medical Metabolomics International Collaborative Research Center, Xiangya Hospital, Central South University, Changsha, 410008, China.
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Saiki R, Katayama K, Dohi K. Recent Advances in Proteinuric Kidney Disease/Nephrotic Syndrome: Lessons from Knockout/Transgenic Mouse Models. Biomedicines 2023; 11:1803. [PMID: 37509442 PMCID: PMC10376620 DOI: 10.3390/biomedicines11071803] [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: 05/17/2023] [Revised: 06/21/2023] [Accepted: 06/21/2023] [Indexed: 07/30/2023] Open
Abstract
Proteinuria is known to be associated with all-cause and cardiovascular mortality, and nephrotic syndrome is defined by the level of proteinuria and hypoalbuminemia. With advances in medicine, new causative genes for genetic kidney diseases are being discovered increasingly frequently. We reviewed articles on proteinuria/nephrotic syndrome, focal segmental glomerulosclerosis, membranous nephropathy, diabetic kidney disease/nephropathy, hypertension/nephrosclerosis, Alport syndrome, and rare diseases, which have been studied in mouse models. Significant progress has been made in understanding the genetics and pathophysiology of kidney diseases thanks to advances in science, but research in this area is ongoing. In the future, genetic analyses of patients with proteinuric kidney disease/nephrotic syndrome may ultimately lead to personalized treatment options.
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Affiliation(s)
- Ryosuke Saiki
- Department of Cardiology and Nephrology, Mie University Graduate School of Medicine, Tsu 514-8507, Japan
| | - Kan Katayama
- Department of Cardiology and Nephrology, Mie University Graduate School of Medicine, Tsu 514-8507, Japan
| | - Kaoru Dohi
- Department of Cardiology and Nephrology, Mie University Graduate School of Medicine, Tsu 514-8507, Japan
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3
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Ye Q, Lan B, Liu H, Persson PB, Lai EY, Mao J. A critical role of the podocyte cytoskeleton in the pathogenesis of glomerular proteinuria and autoimmune podocytopathies. Acta Physiol (Oxf) 2022; 235:e13850. [PMID: 35716094 DOI: 10.1111/apha.13850] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/23/2022] [Accepted: 06/13/2022] [Indexed: 01/19/2023]
Abstract
Selective glomerular filtration relies on the membrane separating the glomerular arterioles from the Bowman space. As a major component of the glomerular filtration barrier, podocytes form foot processes by the actin cytoskeleton, which dynamically adjusts in response to environmental changes to maintain filtration barrier integrity. The slit diaphragms bridge the filtration slits between neighboring foot processes and act as signaling hubs interacting with the actin cytoskeleton. Focal adhesions relay signals to regulate actin dynamics while allowing podocyte adherence to the basement membrane. Mutations in actin regulatory and signaling proteins may disrupt the actin cytoskeleton, resulting in foot process retraction, effacement, and proteinuria. Large-scale gene expression profiling platforms, transgenic animal models, and other in vivo gene delivery methods now enhance our understanding of the interactions among podocyte focal adhesions, slit diaphragms, and actin dynamics. In addition, our team found that at least 66% of idiopathic nephrotic syndrome (INS) children have podocyte autoantibodies, which was defined as a new disease subgroup-, autoimmune podocytopathies. This review outlines the pathophysiological mechanisms of podocyte cytoskeleton protein interactions in proteinuria and glomerular podocytopathy.
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Affiliation(s)
- Qing Ye
- Department of Clinical Laboratory, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, National Children's Regional Medical Center, Hangzhou, China
| | - Bing Lan
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, National Children's Regional Medical Center, Hangzhou, China
| | - Huihui Liu
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, National Children's Regional Medical Center, Hangzhou, China
| | - Pontus B Persson
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Translational Physiology, Berlin, Germany
| | - En Yin Lai
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Translational Physiology, Berlin, Germany.,Department of Physiology, School of Basic Medical Sciences, Zhejiang University School of Medicine, Hangzhou, China
| | - Jianhua Mao
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, National Children's Regional Medical Center, Hangzhou, China
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NUP133 Controls Nuclear Pore Assembly, Transcriptome Composition, and Cytoskeleton Regulation in Podocytes. Cells 2022; 11:cells11081259. [PMID: 35455939 PMCID: PMC9025798 DOI: 10.3390/cells11081259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 04/04/2022] [Accepted: 04/05/2022] [Indexed: 02/04/2023] Open
Abstract
Steroid-resistant nephrotic syndrome (SRNS) frequently leads to end-stage renal disease, ultimately requiring kidney replacement therapies. SRNS is often caused by hereditary monogenic mutations, specifically affecting specialized epithelial cells (podocytes) of the glomerular filtration barrier. Mutations in several components of the nuclear pore complex, including NUP133 and NUP107, have been recently identified to cause hereditary SRNS. However, underlying pathomechanisms, eliciting podocyte-specific manifestations of these nucleoporopathies, remained largely elusive. Here, we generated an in vitro model of NUP133-linked nucleoporopathies using CRISPR/Cas9-mediated genome editing in human podocytes. Transcriptome, nuclear pore assembly, and cytoskeleton regulation of NUP133 loss-of-function, mutant, and wild-type podocytes were analyzed. Loss of NUP133 translated into a disruption of the nuclear pore, alterations of the podocyte-specific transcriptome, and impaired cellular protrusion generation. Surprisingly, comparative analysis of the described SRNS-related NUP133 mutations revealed only mild defects. Am impaired protein interaction in the Y-complex and decrease of NUP133 protein levels might be the primary and unifying consequence of mutant variants, leading to a partial loss-of-function phenotype and disease manifestation in susceptible cell types, such as podocytes.
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Abstract
RNA-binding proteins (RBPs) are of fundamental importance for post-transcriptional gene regulation and protein synthesis. They are required for pre-mRNA processing and for RNA transport, degradation and translation into protein, and can regulate every step in the life cycle of their RNA targets. In addition, RBP function can be modulated by RNA binding. RBPs also participate in the formation of ribonucleoprotein complexes that build up macromolecular machineries such as the ribosome and spliceosome. Although most research has focused on mRNA-binding proteins, non-coding RNAs are also regulated and sequestered by RBPs. Functional defects and changes in the expression levels of RBPs have been implicated in numerous diseases, including neurological disorders, muscular atrophy and cancers. RBPs also contribute to a wide spectrum of kidney disorders. For example, human antigen R has been reported to have a renoprotective function in acute kidney injury (AKI) but might also contribute to the development of glomerulosclerosis, tubulointerstitial fibrosis and diabetic kidney disease (DKD), loss of bicaudal C is associated with cystic kidney diseases and Y-box binding protein 1 has been implicated in the pathogenesis of AKI, DKD and glomerular disorders. Increasing data suggest that the modulation of RBPs and their interactions with RNA targets could be promising therapeutic strategies for kidney diseases.
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PP2A Catalytic Subunit α promotes fibroblast activation and kidney fibrosis via ERK pathway. Cell Signal 2021; 90:110187. [PMID: 34780974 DOI: 10.1016/j.cellsig.2021.110187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 11/01/2021] [Accepted: 11/02/2021] [Indexed: 11/22/2022]
Abstract
Protein Phosphatase 2A (PP2A), a main serine/threonine phosphatase, plays a profibrotic role in the development of different organs. However, the role and mechanisms of PP2Acα in fibroblast activation and kidney fibrosis are not fully known. Here we found that PP2Acα expression was upregulated in kidney tissue of chronic kidney disease (CKD) patients and unilateral ureter obstructive (UUO) mice. Ablation of fibroblast PP2Acα alleviates fibroblast activation and kidney fibrosis in mouse kidneys with UUO nephropathy compared with the control littermates. In primary cultured fibroblasts, PP2Acα deletion restrains TGFβ1-induced fibroblast activation, which is accompanied by increased phosphorylation of the extracellular regulated kinase (ERK). Blocking ERK pathway activation by PD98059 could promote fibroblast activation, indicating that PP2Acα promotes TGFβ1-induced fibroblast activation via suppressing ERK pathway. Consistently, in vivo, the activation of ERK pathway was upregulated by PP2Acα ablation in kidney fibroblasts. Together, these data uncover that PP2Acα may promote fibroblast activation and kidney fibrosis via suppressing ERK pathway, suggesting that targeting PP2Acα may provide a therapeutic effect for CKD.
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Lu Z, Zhu X, Ye Y, Fu H, Mao J. PP2A protects podocytes against Adriamycin-induced injury and epithelial-to-mesenchymal transition via suppressing JIP4/p38-MAPK pathway. Cytotechnology 2021; 73:697-713. [PMID: 34629746 DOI: 10.1007/s10616-021-00484-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 06/21/2021] [Indexed: 02/06/2023] Open
Abstract
Protein phosphatase 2A (PP2A) is one of the major protein serine/threonine phosphatases (PPPs) with regulatory effects on several cellular processes, but its role and function in Adriamycin (ADR)-treated podocytes injury needs to be further explored. Mice podocytes were treated with ADR and PP2A inhibitor (okadaic acid, OA). After transfection, cell apoptosis was detected by flow cytometry. Expressions of podocytes injury-, apoptosis- and epithelial-to-mesenchymal transition (EMT)- and JNK-interacting protein 4/p38-Mitogen-Activated Protein Kinase (JIP4/p38-MAPK) pathway-related factors were measured using quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot as needed. Interaction between PP2A and JIP4/MAPK pathway was confirmed using co-immunoprecipitation (Co-Ip) assay. In podocytes, ADR inhibited PP2A, Nephrin and Wilms' tumor (WT) 1 expressions yet upregulated apoptosis and Desmin expression, and suppressing PP2A expressionenhanced the effects. PP2A overexpression reversed the effects of ADR on PP2A and podocyte injury-related factors expressions and apoptosis of podocytes. JIP4 was the candidate gene interacting with both PP2A and p38-MAPK pathway, and PP2A overexpression alleviated the effects of ADR on p38-MAPK pathway-related factors expressions. Additionally, in ADR-treated podocytes, PP2A suppression enhanced the effects of ADR, yet silencing of JIP4 reversed the effects of PP2A suppression on regulating p38-MAPK pathway-, apoptosis- and EMT-related factors expressions and apoptosis, with upregulations of B-cell lymphoma-2 (Bcl-2) and E-cadherin and down-regulations of Bcl-2 associated protein X (Bax), cleaved (C)-casapse-3, N-cadherin, Vimentin and Snail. PP2A protects ADR-treated podocytes against injury and EMT by suppressing JIP4/p38-MAPK pathway, showing their interaction in podocytes.
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Affiliation(s)
- Zhihong Lu
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, No. 3333 Binsheng Road, Binjiang District, Hangzhou, 310052 Zhejiang China
| | - Xiujuan Zhu
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, No. 3333 Binsheng Road, Binjiang District, Hangzhou, 310052 Zhejiang China
| | - Yuhong Ye
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, No. 3333 Binsheng Road, Binjiang District, Hangzhou, 310052 Zhejiang China
| | - Haidong Fu
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, No. 3333 Binsheng Road, Binjiang District, Hangzhou, 310052 Zhejiang China
| | - Jianhua Mao
- Department of Nephrology, The Children's Hospital, Zhejiang University School of Medicine, No. 3333 Binsheng Road, Binjiang District, Hangzhou, 310052 Zhejiang China
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8
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Lu Q, Hou Q, Cao K, Sun X, Liang Y, Gu M, Xue X, Zhao AZ, Dai C. Complement factor B in high glucose-induced podocyte injury and diabetic kidney disease. JCI Insight 2021; 6:147716. [PMID: 34622800 PMCID: PMC8525650 DOI: 10.1172/jci.insight.147716] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 08/27/2021] [Indexed: 02/06/2023] Open
Abstract
The role and mechanisms for upregulating complement factor B (CFB) expression in podocyte dysfunction in diabetic kidney disease (DKD) are not fully understood. Here, analyzing Gene Expression Omnibus GSE30528 data, we identified genes enriched in mTORC1 signaling, CFB, and complement alternative pathways in podocytes from patients with DKD. In mouse models, podocyte mTOR complex 1 (mTORC1) signaling activation was induced, while blockade of mTORC1 signaling reduced CFB upregulation, alternative complement pathway activation, and podocyte injury in the glomeruli. Knocking down CFB remarkably alleviated alternative complement pathway activation and DKD in diabetic mice. In cultured podocytes, high glucose treatment activated mTORC1 signaling, stimulated STAT1 phosphorylation, and upregulated CFB expression, while blockade of mTORC1 or STAT1 signaling abolished high glucose–upregulated CFB expression. Additionally, high glucose levels downregulated protein phosphatase 2Acα (PP2Acα) expression, while PP2Acα deficiency enhanced high glucose–induced mTORC1/STAT1 activation, CFB induction, and podocyte injury. Taken together, these findings uncover a mechanism by which CFB mediates podocyte injury in DKD.
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Affiliation(s)
| | | | - Kai Cao
- Center for Kidney Disease and
| | - Xiaoli Sun
- Department of Clinical Genetics, Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | | | | | - Xian Xue
- Department of Clinical Genetics, Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Allan Zijian Zhao
- Institute of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou, China
| | - Chunsun Dai
- Center for Kidney Disease and.,Department of Clinical Genetics, Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
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Shao L, Ma Y, Fang Q, Huang Z, Wan S, Wang J, Yang L. Role of protein phosphatase 2A in kidney disease (Review). Exp Ther Med 2021; 22:1236. [PMID: 34539832 PMCID: PMC8438693 DOI: 10.3892/etm.2021.10671] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 01/06/2021] [Indexed: 12/12/2022] Open
Abstract
Kidney disease affects millions of people worldwide and is a financial burden on the healthcare system. Protein phosphatase 2A (PP2A), which is involved in renal development and the function of ion-transport proteins, aquaporin-2 and podocytes, is likely to serve an important role in renal processes. PP2A is associated with the pathogenesis of a variety of different kidney diseases including podocyte injury, inflammation, tumors and chronic kidney disease. The current review aimed to discuss the structure and function of PP2A subunits in the context of kidney diseases. How dysregulation of PP2A in the kidneys causes podocyte death and the inactivation of PP2A in renal carcinoma tissues is discussed. Inhibition of PP2A activity prevents epithelial-mesenchymal transition and attenuates renal fibrosis, creating a favorable inflammatory microenvironment and promoting the initiation and progression of tumor pathogenesis. The current review also indicates that PP2A serves an important role in protection against renal inflammation. Understanding the detailed mechanisms of PP2A provides information that can be utilized in the design and application of novel therapeutics for the treatment and prevention of renal diseases.
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Affiliation(s)
- Lishi Shao
- Department of Radiology, Kunming Medical University and The Second Affiliated Hospital, Kunming, Yunnan 650500, P.R. China
| | - Yiqun Ma
- Department of Radiology, Kunming Medical University and The Second Affiliated Hospital, Kunming, Yunnan 650500, P.R. China
| | - Qixiang Fang
- Department of Urology, The First Affiliated Hospital of the Medical College of Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P.R. China
| | - Ziye Huang
- Department of Urology, Kunming Medical University and The Second Affiliated Hospital, Kunming, Yunnan 650500, P.R. China
| | - Shanshan Wan
- Department of Radiology, Yunnan Kun-Gang Hospital, Anning, Yunnan 650300, P.R. China
| | - Jiaping Wang
- Department of Radiology, Kunming Medical University and The Second Affiliated Hospital, Kunming, Yunnan 650500, P.R. China
| | - Li Yang
- Department of Anatomy, Histology and Embryology, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
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Ye Q, Zhang Y, Zhuang J, Bi Y, Xu H, Shen Q, Liu J, Fu H, Wang J, Feng C, Tang X, Liu F, Gu W, Zhao F, Zhang J, Qin Y, Shang S, Shen H, Chen X, Shen H, Liu A, Xia Y, Lu Z, Shu Q, Mao J. The important roles and molecular mechanisms of annexin A 2 autoantibody in children with nephrotic syndrome. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:1452. [PMID: 34734004 PMCID: PMC8506724 DOI: 10.21037/atm-21-3988] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 09/01/2021] [Indexed: 01/19/2023]
Abstract
BACKGROUND In recent years, B-cell dysfunction has been found to play an important role in the pathogenesis of primary nephrotic syndrome (PNS). B cells play a pathogenic role by secreting antibodies against their target antigens after transforming into plasma cells. Therefore, this study aimed to screen the autoantibodies that cause PNS and explore their pathogenic mechanisms. METHODS Western blotting and mass spectrometry were employed to screen and identify autoantibodies against podocytes in children with PNS. Both in vivo and in vitro experiments were used to study the pathogenic mechanism of PNS. The results were confirmed in a large multicenter clinical study in children. RESULTS Annexin A2 autoantibody was highly expressed in children with PNS with a pathological type of minimal change disease (MCD) or focal segmental glomerulosclerosis without genetic factors. The mouse model showed that anti-Annexin A2 antibody could induce proteinuria in vivo. Mechanistically, the effect of Annexin A2 antibody on the Rho signaling pathway was realized through promoting the phosphorylation of Annexin A2 at Tyr24 on podocytes by reducing its binding to PTP1B, which led to the cytoskeletal rearrangement and damage of podocytes, eventually causing proteinuria and PNS. CONCLUSIONS Annexin A2 autoantibody may be responsible for some cases of PNS with MCD/FSGS in children.
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Affiliation(s)
- Qing Ye
- Department of Clinical Laboratory, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Yingying Zhang
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Jieqiu Zhuang
- Department of Pediatric Nephrology, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ye Bi
- Department of Pediatric Nephrology, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, China
| | - Hong Xu
- Department of Nephrology, Children’s Hospital of Fudan University, National Pediatric Medical Center of China, Shanghai, China
| | - Qian Shen
- Department of Nephrology, Children’s Hospital of Fudan University, National Pediatric Medical Center of China, Shanghai, China
| | - Jialu Liu
- Department of Nephrology, Children’s Hospital of Fudan University, National Pediatric Medical Center of China, Shanghai, China
| | - Haidong Fu
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Jingjing Wang
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Chunyue Feng
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Xiaoxiao Tang
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Fei Liu
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Weizhong Gu
- Department of Pathology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Fei Zhao
- Department of Nephrology, Children’s Hospital of Nanjing Medical University, Nanjing, China
| | - Jianjiang Zhang
- Department of Pediatrics, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yuanhan Qin
- Department of Pediatric Nephrology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Shiqiang Shang
- Department of Clinical Laboratory, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Hongqiang Shen
- Department of Clinical Laboratory, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Xuejun Chen
- Department of Clinical Laboratory, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Huijun Shen
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Aimin Liu
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Yonghui Xia
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Zhihong Lu
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Qiang Shu
- Department of Thoracic and Cardiovascular Surgery, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Jianhua Mao
- Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
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11
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DNA demethylase Tet2 suppresses cisplatin-induced acute kidney injury. Cell Death Dis 2021; 7:167. [PMID: 34226503 PMCID: PMC8257623 DOI: 10.1038/s41420-021-00528-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 04/08/2021] [Accepted: 05/23/2021] [Indexed: 02/06/2023]
Abstract
Demethylase Tet2 plays a vital role in the immune response. Acute kidney injury (AKI) initiation and maintenance phases are marked by inflammatory responses and leukocyte recruitment in endothelial and tubular cell injury processes. However, the role of Tet2 in AKI is poorly defined. Our study determined the degree of renal tissue damage associated with Tet2 gene expression levels in a cisplatin-induced AKI mice model. Tet2-knockout (KO) mice with cisplatin treatment experienced severe tubular necrosis and dilatation, inflammation, and AKI markers' expression levels than the wild-type mice. In addition, the administration of Tet2 plasmid protected Tet2-KO mice from cisplatin-induced nephrotoxicity, but not Tet2-catalytic-dead mutant. Tet2 KO was associated with a change in metabolic pathways like retinol, arachidonic acid, linolenic acid metabolism, and PPAR signaling pathway in the cisplatin-induced mice model. Tet2 expression is also downregulated in other AKI mice models and clinical samples. Thus, our results indicate that Tet2 has a renal protective effect during AKI by regulating metabolic and inflammatory responses through the PPAR signaling pathway.
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12
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Zhang Y, Xu C, Ye Q, Tong L, Jiang H, Zhu X, Huang L, Lin W, Fu H, Wang J, Persson PB, Lai EY, Mao J. Podocyte apoptosis in diabetic nephropathy by BASP1 activation of the p53 pathway via WT1. Acta Physiol (Oxf) 2021; 232:e13634. [PMID: 33615732 DOI: 10.1111/apha.13634] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 02/05/2021] [Accepted: 02/18/2021] [Indexed: 12/20/2022]
Abstract
AIMS Diabetic nephropathy (DN) is a leading cause of end-stage renal disease. BASP1 (brain acid-soluble protein) is up-regulated in podocyte-specific protein phosphatase 2A knockout mice (Pod-PP2A-KO) that develop kidney dysfunction. Here, we explore the role of BASP1 for podocytes in DN. METHODS BASP1 was assessed in kidneys from DN patients and DN mouse models, podocyte specific BASP1 knockout mice (Pod-BASP1-KO mice) were generated and studied in vivo. Furthermore, podocyte injury and apoptosis were measured after BASP1 knockdown and overexpression in a mouse podocyte cell line (MPC5). Potential signalling pathways involved in podocyte apoptosis were detected. RESULTS BASP1 expression was up-regulated in DN patients compared to normal controls. BASP1 specific deletion in podocytes protected against podocyte injury by reducing the loss of expression of slit diaphragm molecules and foot process effacement in the DN model. BASP1 promoted actin cytoskeleton rearrangements and apoptosis in the MPC5 podocyte line. Molecules involved in the p53 pathway were down-regulated in BASP1 knockdown podocytes treated with high glucose compared to controls. BASP1 promoted podocyte apoptosis and P53 pathway activation through co-repression with Wilms' tumour 1 transcription factor (WT1). CONCLUSION BASP1 activates the p53 pathway through modulation of WT1 to induce podocyte apoptosis in diabetic nephropathy.
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Affiliation(s)
- Yingying Zhang
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Chengxian Xu
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Qing Ye
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Lingxiao Tong
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Hong Jiang
- Kidney Disease Center The First Affiliated HospitalZhejiang University School of Medicine Hangzhou China
| | - Xiujuan Zhu
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Limin Huang
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Weiqiang Lin
- Institute of Translational Medicine Zhejiang University School of Medicine Hangzhou China
| | - Haidong Fu
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Jingjing Wang
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
| | - Pontus B. Persson
- Institute of Vegetative Physiology Charité–Universitätsmedizin Berlincorporate member of Freie Universität Berlin, Humboldt‐Universität zu Berlin, and Berlin Institute of Health Berlin Germany
| | - En Yin Lai
- Kidney Disease Center The First Affiliated HospitalZhejiang University School of Medicine Hangzhou China
- Institute of Vegetative Physiology Charité–Universitätsmedizin Berlincorporate member of Freie Universität Berlin, Humboldt‐Universität zu Berlin, and Berlin Institute of Health Berlin Germany
- Department of Physiology Zhejiang University School of Medicine Hangzhou China
| | - Jianhua Mao
- Department of Nephrology The Children Hospital of Zhejiang University School of MedicineNational Clinical Research Center for Child HealthNational Children’s Regional Medical Center Hangzhou China
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