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Li LL, Luan ZQ, Tan Y, Wang H, Yu XJ, Qu Z, Yu F, Chen M. Anti-complement factor H (CFH) autoantibodies could delay pristane-induced lupus nephritis. Immunol Res 2023; 71:849-859. [PMID: 37322353 PMCID: PMC10667379 DOI: 10.1007/s12026-023-09396-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 05/12/2023] [Indexed: 06/17/2023]
Abstract
PURPOSE Anti-complement factor H (CFH) autoantibodies could be detected in lupus and its significance remained to be elucidated. Herein, we aimed to explore the roles of anti-CFH autoantibodies based on pristane-induced lupus mice. METHODS Twenty-four female Balb/c mice were randomly divided into four groups, with one group injected with pristane (pristane group), one group with pristane and then human CFH (hCFH) (pristane-CFH group) 3 times, and the other two as vertical controls, PBS group and PBS-CFH group. Histopathological analysis was performed six months after pristane administration. Levels of hCFH, anti-CFH autoantibodies and anti-dsDNA antibody were detected. Murine IgG (mIgG) were purified and cross-reactivity, epitopes, subclasses and functional analysis were further evaluated in vitro. RESULTS Immunization with hCFH and subsequent development of anti-CFH autoantibodies significantly attenuated nephritis of pristane-induced lupus, including lower levels of urinary protein and serum creatinine, decreased levels of serum anti-dsDNA antibody, greatly ameliorated renal histopathologic damage, decreased IgG, complements (C1q, C3) deposits and lower inflammatory factor (IL-6) expression in glomerulus. Furthermore, the purified mIgG (contained anti-CFH autoantibodies) could recognize both hCFH and murine CFH, and the epitopes were predominantly located in hCFH short consensus repeats (SCRs) 1-4, 7 and 11-14. The IgG subclasses were predominant IgG1. The autoantibodies could enhance the binding between hCFH and C3b, and increase factor I mediated-C3b lysis in vitro. CONCLUSION Our results suggested that anti-CFH autoantibodies could attenuate pristane-induced lupus nephritis by increasing bio-functions of CFH on regulating complement activation and controlling inflammation.
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Affiliation(s)
- Lin-Lin Li
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China
- Renal Division, Henan Provincial People's Hospital, Zhengzhou, China
| | - Zhong-Qiu Luan
- Department of Nephrology, First Affiliated Hospital of Heilongjiang, University of Chinese Medicine, Beijing, China
| | - Ying Tan
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China
| | - Hui Wang
- Laboratory of Electron Microscopy, Pathological Centre, Peking University First Hospital, Beijing, China
| | - Xiao-Juan Yu
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China
| | - Zhen Qu
- Department of Nephrology, Peking University International Hospital, Beijing, China.
| | - Feng Yu
- Department of Nephrology, Peking University International Hospital, Beijing, China
| | - Min Chen
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China
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Tao Q, Zhang C, Mercier G, Lunetta K, Ang TFA, Akhter‐Khan S, Zhang Z, Taylor A, Killiany RJ, Alosco M, Mez J, Au R, Zhang X, Farrer LA, Qiu WWQ. Identification of an APOE ε4-specific blood-based molecular pathway for Alzheimer's disease risk. ALZHEIMER'S & DEMENTIA (AMSTERDAM, NETHERLANDS) 2023; 15:e12490. [PMID: 37854772 PMCID: PMC10579631 DOI: 10.1002/dad2.12490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 09/25/2023] [Indexed: 10/20/2023]
Abstract
INTRODUCTION The precise apolipoprotein E (APOE) ε4-specific molecular pathway(s) for Alzheimer's disease (AD) risk are unclear. METHODS Plasma protein modules/cascades were analyzed using weighted gene co-expression network analysis (WGCNA) in the Alzheimer's Disease Neuroimaging Initiative study. Multivariable regression analyses were used to examine the associations among protein modules, AD diagnoses, cerebrospinal fluid (CSF) phosphorylated tau (p-tau), and brain glucose metabolism, stratified by APOE genotype. RESULTS The Green Module was associated with AD diagnosis in APOE ε4 homozygotes. Three proteins from this module, C-reactive protein (CRP), complement C3, and complement factor H (CFH), had dose-dependent associations with CSF p-tau and cognitive impairment only in APOE ε4 homozygotes. The link among these three proteins and glucose hypometabolism was observed in brain regions of the default mode network (DMN) in APOE ε4 homozygotes. A Framingham Heart Study validation study supported the findings for AD. DISCUSSION The study identifies the APOE ε4-specific CRP-C3-CFH inflammation pathway for AD, suggesting potential drug targets for the disease.Highlights: Identification of an APOE ε4 specific molecular pathway involving blood CRP, C3, and CFH for the risk of AD.CRP, C3, and CFH had dose-dependent associations with CSF p-Tau and brain glucose hypometabolism as well as with cognitive impairment only in APOE ε4 homozygotes.Targeting CRP, C3, and CFH may be protective and therapeutic for AD onset in APOE ε4 carriers.
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Affiliation(s)
- Qiushan Tao
- Department of Pharmacology, Physiology & BiophysicsBoston University School of MedicineBostonMassachusettsUSA
- Slone Epidemiology CenterSchool of Public HealthBoston University Medical Campus (BUMC)BostonMassachusettsUSA
| | - Chao Zhang
- Section of Computational BiomedicineDepartment of MedicineBoston University School of MedicineBostonMassachusettsUSA
| | - Gustavo Mercier
- Section of Molecular Imaging and Nuclear MedicineDepartment of RadiologyBoston University School of MedicineBostonMassachusettsUSA
| | - Kathryn Lunetta
- Slone Epidemiology CenterSchool of Public HealthBoston University Medical Campus (BUMC)BostonMassachusettsUSA
- Department of BiostatisticsBoston University School of Public HealthBostonMassachusettsUSA
| | - Ting Fang Alvin Ang
- Slone Epidemiology CenterSchool of Public HealthBoston University Medical Campus (BUMC)BostonMassachusettsUSA
- Department of Anatomy & NeurobiologyBoston University School of MedicineBostonMassachusettsUSA
| | - Samia Akhter‐Khan
- Department of Health Service & Population ResearchKing's College London, LondonDavid Goldberg CentreLondonUK
| | - Zhengrong Zhang
- Department of Pharmacology, Physiology & BiophysicsBoston University School of MedicineBostonMassachusettsUSA
| | - Andrew Taylor
- Department of OphthalmologyBoston University School of MedicineBostonMassachusettsUSA
| | - Ronald J. Killiany
- Department of Anatomy & NeurobiologyBoston University School of MedicineBostonMassachusettsUSA
| | - Michael Alosco
- Department of NeurologyBoston University School of MedicineBostonMassachusettsUSA
| | - Jesse Mez
- Department of NeurologyBoston University School of MedicineBostonMassachusettsUSA
- Alzheimer's Disease and CTE CentersBoston University School of MedicineBostonMassachusettsUSA
| | - Rhoda Au
- Slone Epidemiology CenterSchool of Public HealthBoston University Medical Campus (BUMC)BostonMassachusettsUSA
- Department of Anatomy & NeurobiologyBoston University School of MedicineBostonMassachusettsUSA
| | - Xiaoling Zhang
- Department of MedicineBoston University School of MedicineBostonMassachusettsUSA
| | - Lindsay A. Farrer
- Alzheimer's Disease and CTE CentersBoston University School of MedicineBostonMassachusettsUSA
- Department of MedicineBoston University School of MedicineBostonMassachusettsUSA
| | - Wendy Wei Qiao Qiu
- Department of Pharmacology, Physiology & BiophysicsBoston University School of MedicineBostonMassachusettsUSA
- Alzheimer's Disease and CTE CentersBoston University School of MedicineBostonMassachusettsUSA
- Department of PsychiatryBoston University School of MedicineBostonMassachusettsUSA
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3
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Ma Z, Mao C, Jia Y, Yu F, Xu P, Tan Y, Zou QH, Zhou XJ, Kong W, Fu Y. ADAMTS7-Mediated Complement Factor H Degradation Potentiates Complement Activation to Contributing to Renal Injuries. J Am Soc Nephrol 2023; 34:291-308. [PMID: 36735376 PMCID: PMC10103097 DOI: 10.1681/asn.0000000000000004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 10/31/2022] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND The dysfunction of complement factor H (CFH), the main soluble complement negative regulator, potentiates various complement-induced renal injuries. However, insights into the underlying mechanism of CFH dysfunction remain limited. In this study, we investigated whether extracellular protease-mediated degradation accounts for CFH dysfunction in complement-mediated renal injuries. METHODS An unbiased interactome of lupus mice kidneys identified CFH-binding protease. In vitro cleavage assay clarified CFH degradation. Pristane-induced SLE or renal ischemia-reperfusion (I/R) injury models were used in wild-type and ADAMTS7-/- mice. RESULTS We identified the metalloprotease ADAMTS7 as a CFH-binding protein in lupus kidneys. Moreover, the upregulation of ADAMTS7 correlated with CFH reduction in both lupus mice and patients. Mechanistically, ADAMTS7 is directly bound to CFH complement control protein (CCP) 1-4 domain and degraded CCP 1-7 domain through multiple cleavages. In mice with lupus nephritis or renal I/R injury, ADAMTS7 deficiency alleviated complement activation and related renal pathologies, but without affecting complement-mediated bactericidal activity. Adeno-associated virus-mediated CFH silencing compromised these protective effects of ADAMTS7 knockout against complement-mediated renal injuries in vivo. CONCLUSION ADAMTS7-mediated CFH degradation potentiates complement activation and related renal injuries. ADAMTS7 would be a promising anticomplement therapeutic target that does not increase bacterial infection risk.
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Affiliation(s)
- Zihan Ma
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Chenfeng Mao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
- Beijing Institute of Biotechnology, Beijing, China
| | - Yiting Jia
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Fang Yu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Ping Xu
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Research Unit of Proteomics & Research and Development of New Drugs of Chinese Academy of Medical Sciences, Beijing Institute of Lifeomics, Beijing, China
| | - Ying Tan
- Renal Division, Peking University First Hospital, Peking University Institute of Nephrology, Key Laboratory of Renal Disease, Ministry of Health of China, Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, China
| | - Qing-Hua Zou
- Department of Microbiology & Infectious Disease Center, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Xu-Jie Zhou
- Renal Division, Peking University First Hospital, Peking University Institute of Nephrology, Key Laboratory of Renal Disease, Ministry of Health of China, Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, China
| | - Wei Kong
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Yi Fu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
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Bai L, Xie Q, Xia M, Gong K, Wang N, Chen Y, Zhao M. The importance of sialic acid, pH and ion concentration on the interaction of uromodulin and complement factor H. J Cell Mol Med 2021; 25:4316-4325. [PMID: 33788378 PMCID: PMC8093974 DOI: 10.1111/jcmm.16492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 03/05/2021] [Accepted: 03/10/2021] [Indexed: 02/06/2023] Open
Abstract
Uromodulin (UMOD) can bind complement factor H (cFH) and inhibit the activation of complement alternative pathway (AP) by enhancing the cofactor activity of cFH on degeneration of C3b. UMOD, an N-glycans-rich glycoprotein, is expressed in thick ascending limb of Henle's loop where the epithelia need to adapt to gradient change of pH and ion concentration. ELISA-based cofactor activity of cFH and erythrocytes haemolytic assay was used to measure the impact of native and de-glycosylated UMOD on the functions of cFH. The binding assay was performed under different pH and ion concentrations, using ELISA. The levels of sialic acid on UMOD, from healthy controls and patients with chronic kidney disease (CKD), were also detected by lectin-ELISA. It was shown that removal of glycans decreased the binding between UMOD and cFH and abolished the ability of enhancing C3b degradation. In acidic condition, the binding became stronger, but it reduced as sodium concentration increased. A significant decrease of α-2,3 sialic acids on UMOD was observed in CKD patients compared with that of healthy individuals. The sialic acids on UMOD, local pH and sodium concentration could impact the binding capacity between UMOD and cFH and thus regulate the activation of complement AP.
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Affiliation(s)
- Lufeng Bai
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Beijing, China
| | - Qiuyu Xie
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education, Beijing, China
| | - Min Xia
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education, Beijing, China
| | - Kunjing Gong
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education, Beijing, China
| | - Na Wang
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education, Beijing, China
| | - Yuqing Chen
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education, Beijing, China
| | - Minghui Zhao
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Beijing, China
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5
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Chen SF, Wang FM, Li ZY, Yu F, Chen M, Zhao MH. Complement Factor H Inhibits Anti-Neutrophil Cytoplasmic Autoantibody-Induced Neutrophil Activation by Interacting With Neutrophils. Front Immunol 2018; 9:559. [PMID: 29616045 PMCID: PMC5867335 DOI: 10.3389/fimmu.2018.00559] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 03/06/2018] [Indexed: 01/12/2023] Open
Abstract
Our previous study demonstrated that plasma levels of complement factor H (FH) were inversely associated with the disease activity of patients with anti-neutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis (AAV). In addition to serving as an inhibitor of the alternative complement pathway, there is increasing evidence demonstrating direct regulatory roles of FH on several cell types. Here, we investigated the role of FH in the process of ANCA-mediated activation of neutrophils and neutrophil–endothelium interaction. We demonstrated that FH bound to neutrophils by immunostaining and flow cytometry. Interestingly, ANCA-induced activation of neutrophils, including respiratory burst and degranulation, was inhibited by FH. Although FH enhanced neutrophils adhesion and migration toward human glomerular endothelial cells (hGEnCs), it inhibited ANCA-induced activation of neutrophils in the coculture system of hGEnCs and neutrophils. Moreover, the activation and injury of hGEnCs, reflected by the level of endothelin-1 in the supernatant of cocultures, was markedly reduced by FH. However, we found that FH from patients with active AAV exhibited a deficient ability in binding neutrophils and inhibiting ANCA-induced neutrophil activation in fluid phase and on endothelial cells, as compared with that from healthy controls. Therefore, our findings indicate a novel role of FH in inhibiting ANCA-induced neutrophil activation and protecting against glomerular endothelial injury. However, FH from patients with active AAV are deficient in their ability to bind neutrophils and inhibit neutrophil activation by ANCA. It further extends the current understanding of the pathogenesis of AAV, thus providing potential clues for intervention strategies.
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Affiliation(s)
- Su-Fang Chen
- Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
| | - Feng-Mei Wang
- Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
| | - Zhi-Ying Li
- Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
| | - Feng Yu
- Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
| | - Min Chen
- Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
| | - Ming-Hui Zhao
- Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Beijing, China
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6
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Expression and characterization of a recombinant porcinized antibody against the E2 protein of classical swine fever virus. Appl Microbiol Biotechnol 2017; 102:961-970. [DOI: 10.1007/s00253-017-8647-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 11/13/2017] [Accepted: 11/13/2017] [Indexed: 10/18/2022]
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7
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Forier C, Boschetti E, Ouhammouch M, Cibiel A, Ducongé F, Nogré M, Tellier M, Bataille D, Bihoreau N, Santambien P, Chtourou S, Perret G. DNA aptamer affinity ligands for highly selective purification of human plasma-related proteins from multiple sources. J Chromatogr A 2017; 1489:39-50. [PMID: 28179082 DOI: 10.1016/j.chroma.2017.01.031] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 01/04/2017] [Accepted: 01/06/2017] [Indexed: 01/18/2023]
Abstract
Nucleic acid aptamers are promising ligands for analytical and preparative-scale affinity chromatography applications. However, a full industrial exploitation requires that aptamer-grafted chromatography media provide a number of high technical standards that remained largely untested. Ideally, they should exhibit relatively high binding capacity associated to a very high degree of specificity. In addition, they must be highly resistant to harsh cleaning/sanitization conditions, as well as to prolonged and repeated exposure to biological environment. Here, we present practical examples of aptamer affinity chromatography for the purification of three human therapeutic proteins from various sources: Factor VII, Factor H and Factor IX. In a single chromatographic step, three DNA aptamer ligands enabled the efficient purification of their target protein, with an unprecedented degree of selectivity (from 0.5% to 98% of purity in one step). Furthermore, these aptamers demonstrated a high stability under harsh sanitization conditions (100h soaking in 1M NaOH). These results pave the way toward a wider adoption of aptamer-based affinity ligands in the industrial-scale purification of not only plasma-derived proteins but also of any other protein in general.
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Affiliation(s)
| | | | | | | | - Frédéric Ducongé
- CEA, I2BM, MIRCen, UMR 9199, Université Paris Saclay, Fontenay aux Roses, France
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Chen SF, Wang FM, Li ZY, Yu F, Chen M, Zhao MH. The functional activities of complement factor H are impaired in patients with ANCA-positive vasculitis. Clin Immunol 2016; 175:41-50. [PMID: 27939215 DOI: 10.1016/j.clim.2016.11.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 11/21/2016] [Accepted: 11/24/2016] [Indexed: 11/26/2022]
Abstract
Increasing evidences have demonstrated that the activation of the alternative complement pathway is crucial for the pathogenesis of anti-neutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis (AAV). Our recent study found that circulating levels of complement factor H (FH), a key regulator of the alternative pathway, were associated with disease activity. In the current study, functional activities of FH were assessed to further explore the potential role of FH in the pathogenesis of AAV. We found that the two patients with ANCA-negative pauci-immune necrotizing crescentic glomerulonephritis exhibited relatively normal functional activities of FH. However, patients with ANCA-positive vasculitis exhibited deficient functional activities of FH, in terms of interaction with and the regulation of C3b, binding to mCRP and endothelial cells, and the protection of host cells against complement attack. Our findings indicate that functional activities of FH are deficient in patients with ANCA-positive vasculitis, potentially contributing to the disease development.
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Affiliation(s)
- Su-Fang Chen
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Beijing 100034, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing 100034, China
| | - Feng-Mei Wang
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Beijing 100034, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing 100034, China
| | - Zhi-Ying Li
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Beijing 100034, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing 100034, China
| | - Feng Yu
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Beijing 100034, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing 100034, China.
| | - Min Chen
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Beijing 100034, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing 100034, China.
| | - Ming-Hui Zhao
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Beijing 100034, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing 100034, China; Peking-Tsinghua Center for Life Sciences, Beijing 100034, China
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9
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Wang FM, Song D, Pang Y, Song Y, Yu F, Zhao MH. The dysfunctions of complement factor H in lupus nephritis. Lupus 2016; 25:1328-40. [PMID: 27068115 DOI: 10.1177/0961203316642307] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Accepted: 02/18/2016] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Our previous study showed that plasma levels of factor H (FH) were significantly decreased in patients with lupus nephritis and reflected lupus nephritis activity. The aim of this study was to further investigate in vitro biofunctions of plasma FH in patients with lupus nephritis. METHODS FH was purified from the first run of plasma exchange in four active lupus nephritis patients and two non-renal involvement systemic lupus erythematosus (SLE) patients, and plasma from two healthy controls. Then, the biofunctions of the purified FH were analyzed. In addition, FH exons sequencing analysis was performed. RESULTS Homogeneous FH was purified from the plasma fractions and the purity of the purified FH was comparable to the commercial FH. The abilities of FH binding with C3b and mCRP, and its protecting abilities from the lysis of sheep erythrocytes, from No. 3 and No. 4 lupus nephritis patients, decreased significantly compared with those in normal controls. The purified FH from lupus nephritis patients Nos. 2-4 could not induce the phagocytosis of late apoptotic cells significantly compared with normal controls. All four lupus nephritis patients had the known SNP rs1061147 (SCR5, A307A), rs1061170 (SCR7, Y402H), CM050194 (SCR20, S1191W) and CM010322 (SCR20, V1197A), which might be associated with the above dysfunctions. CONCLUSIONS Dysfunctions of FH, including the regulations of complement alternative pathway and the clearance of apoptotic cells, were found in some active lupus nephritis patients, which were associated with their clinical phenotypes. The FH SNPs might contribute to the dysfunctions of FH in patients with lupus nephritis.
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Affiliation(s)
- F-M Wang
- Renal Division, Department of Medicine, Peking University First Hospital; Institute of Nephrology, Peking University, PR China Key Laboratory of Renal Disease, Ministry of Health of China, PR China; Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China, PR China Institute of Nephrology, Zhongda Hospital, Southeast University, Nanjing, PR China
| | - D Song
- Renal Division, Department of Medicine, Peking University First Hospital; Institute of Nephrology, Peking University, PR China Key Laboratory of Renal Disease, Ministry of Health of China, PR China; Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China, PR China
| | - Y Pang
- Renal Division, Department of Medicine, Peking University First Hospital; Institute of Nephrology, Peking University, PR China Key Laboratory of Renal Disease, Ministry of Health of China, PR China; Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China, PR China
| | - Y Song
- Department of Nephrology, the First Affiliated Hospital of Chinese PLA General Hospital, Beijing, PR China
| | - F Yu
- Renal Division, Department of Medicine, Peking University First Hospital; Institute of Nephrology, Peking University, PR China Key Laboratory of Renal Disease, Ministry of Health of China, PR China; Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China, PR China Department of Nephrology, Peking University International Hospital, Beijing, PR China
| | - M-H Zhao
- Renal Division, Department of Medicine, Peking University First Hospital; Institute of Nephrology, Peking University, PR China Key Laboratory of Renal Disease, Ministry of Health of China, PR China; Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China, PR China Peking-Tsinghua Center for Life Sciences, Beijing, PR China
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