1
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Lv M, Cai Y, Hou W, Peng K, Xu K, Lu C, Yu W, Zhang W, Liu L. The C5AR1/TNFSF13B axis alleviates osteoarthritis by activating the PI3K/Akt/GSK3β/Nrf2/HO-1 pathway to inhibit ferroptosis. Exp Cell Res 2024; 441:114195. [PMID: 39098466 DOI: 10.1016/j.yexcr.2024.114195] [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: 04/23/2024] [Revised: 07/05/2024] [Accepted: 08/02/2024] [Indexed: 08/06/2024]
Abstract
Chondrocyte ferroptosis induces the occurrence of osteoarthritis (OA). As a key gene of OA, C5a receptor 1 (C5AR1) is related to ferroptosis. Here, we investigated whether C5AR1 interferes with chondrocyte ferroptosis during OA occurrence. C5AR1 was downregulated in PA-treated chondrocytes. Overexpression of C5AR1 increased the cell viability and decreased ferroptosis in chondrocytes. Moreover, Tumor necrosis factor superfamily member 13B (TNFSF13B) was downregulated in PA-treated chondrocytes, and knockdown of TNFSF13B eliminated the inhibitory effect of C5AR1 on ferroptosis in chondrocytes. More importantly, the PI3K/Akt/GSK3β/Nrf2/HO-1 pathway inhibitor LY294002 reversed the inhibition of C5AR1 or TNFSF13B on ferroptosis in chondrocytes. Finally, we found that C5AR1 alleviated joint tissue lesions and ferroptosis in rats and inhibited the progression of OA in the rat OA model constructed by anterior cruciate ligament transection (ACLT), which was reversed by interfering with TNFSF13B. This study shows that C5AR1 reduces the progression of OA by upregulating TNFSF13B to activate the PI3K/Akt/GSK3β/Nrf2/HO-1 pathway and thereby inhibiting chondrocyte sensitivity to ferroptosis, indicating that C5AR1 may be a potential therapeutic target for ferroptosis-related diseases.
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Affiliation(s)
- Min Lv
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Yuanzhen Cai
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Weikun Hou
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Kan Peng
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Ke Xu
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Chao Lu
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Wenxing Yu
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Weisong Zhang
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China
| | - Lin Liu
- Osteonecrosis and Joint Reconstruction Ward, Honghui Hospital, Xi'an Jiaotong University, China.
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Zhang T, Ma N, Wang J, Min X, Wei L, Li K. C5aR2 Deficiency Lessens C5aR1 Distribution and Expression in Neutrophils and Macrophages. J Immunol Res 2024; 2024:2899154. [PMID: 39021433 PMCID: PMC11254461 DOI: 10.1155/2024/2899154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 06/05/2024] [Accepted: 06/20/2024] [Indexed: 07/20/2024] Open
Abstract
As another receptor for complement activation product C5a, C5aR2 has been paid much attention these years. Although controversial and complex, its specific signals or roles in modulating the classic receptor C5aR1 have been investigated and gradually revealed. The hypothesis of the heterodimer of C5aR1 and C5aR2 has also been suggested and observed under extremely high C5a concentrations. In this article, we tried to investigate whether C5aR2 would affect C5aR1 expression under normal or inflammatory conditions in WT and C5ar2 -/- mice of C57BL/6 background. We focused on the innate immune cells-neutrophils and macrophages. The mRNA levels of C5ar1 in normal kidney, liver, and the mRNA or protein levels of naïve-bone marrow and peripheral blood leukocytes and peritoneal Mφs were comparable between WT and C5ar2 -/- mice, indicating the technique of C5aR2 knockout did not affect the transcription of its neighboring gene C5aR1. However, the mean fluorescence intensity of surface C5aR1 on naïve circulating C5ar2 -/- neutrophils detected by FACS was reduced, which might be due to the reduced internalization of C5aR1 on C5ar2 -/- neutrophils. In the peritonitis model induced by i.p. injection of thioglycollate, more neutrophils were raised after 10 hr in C5ar2 -/- peritoneal cavity, indicating the antagonism of C5aR2 on C5aR1 signal in neutrophil chemotaxis. After 3 days of thioglycollate injection, the mainly infiltrating macrophages were comparable between WT and C5ar2 -/- mice, but the C5ar1 mRNA and surface or total C5aR1 protein expression were both reduced in C5ar2 -/- macrophages, combined with our previous study of reduced chemokines and cytokines expression in C5ar2 -/- peritoneal macrophages, indicating that C5aR2 in macrophages may cooperate with C5aR1 inflammatory signals. Our article found C5aR2 deficiency lessened C5aR1 distribution and expression in neutrophils and macrophages with different functions, indicating C5aR2 might function differently in different cells.
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Affiliation(s)
- Ting Zhang
- Department of PathologyThe Second Affiliated HospitalSchool of MedicineXi'an Jiaotong University, Xi'an 710004, China
- Core Research LaboratoryThe Second Affiliated HospitalSchool of MedicineXi'an Jiaotong University, Xi'an 710004, China
| | - Ning Ma
- Core Research LaboratoryThe Second Affiliated HospitalSchool of MedicineXi'an Jiaotong University, Xi'an 710004, China
| | - Jiaxing Wang
- Institute of HematologySchool of MedicineNorthwest University, Xi'an 710069, China
| | - Xiaoyun Min
- Core Research LaboratoryThe Second Affiliated HospitalSchool of MedicineXi'an Jiaotong University, Xi'an 710004, China
| | - Linlin Wei
- Core Research LaboratoryThe Second Affiliated HospitalSchool of MedicineXi'an Jiaotong University, Xi'an 710004, China
| | - Ke Li
- Core Research LaboratoryThe Second Affiliated HospitalSchool of MedicineXi'an Jiaotong University, Xi'an 710004, China
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Perretta‐Tejedor N, Price KL, Jafree DJ, Pomeranz G, Kolatsi‐Joannou M, Martínez‐Salgado C, Long DA, Vasilopoulou E. Cardiotrophin-1 therapy reduces disease severity in a murine model of glomerular disease. Physiol Rep 2024; 12:e16129. [PMID: 38955668 PMCID: PMC11219243 DOI: 10.14814/phy2.16129] [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: 02/22/2024] [Revised: 06/10/2024] [Accepted: 06/20/2024] [Indexed: 07/04/2024] Open
Abstract
Cardiotrophin-1 (CT-1), a member of the interleukin (IL)-6 cytokine family, has renoprotective effects in mouse models of acute kidney disease and tubulointerstitial fibrosis, but its role in glomerular disease is unknown. To address this, we used the mouse model of nephrotoxic nephritis to test the hypothesis that CT-1 also has a protective role in immune-mediated glomerular disease. Using immunohistochemistry and analysis of single-cell RNA-sequencing data of isolated glomeruli, we demonstrate that CT-1 is expressed in the glomerulus in male mice, predominantly in parietal epithelial cells and is downregulated in mice with nephrotoxic nephritis. Furthermore, analysis of data from patients revealed that human glomerular disease is also associated with reduced glomerular CT-1 transcript levels. In male mice with nephrotoxic nephritis and established proteinuria, administration of CT-1 resulted in reduced albuminuria, prevented podocyte loss, and sustained plasma creatinine, compared with mice administered saline. CT-1 treatment also reduced fibrosis in the kidney cortex, peri-glomerular macrophage accumulation and the kidney levels of the pro-inflammatory mediator complement component 5a. In conclusion, CT-1 intervention therapy delays the progression of glomerular disease in mice by preserving kidney function and inhibiting renal inflammation and fibrosis.
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Affiliation(s)
- Nuria Perretta‐Tejedor
- Developmental Biology and Cancer Research and Teaching DepartmentUCL Great Ormond Street Institute of Child HealthLondonUK
- UCL Centre for Kidney and Bladder HealthLondonUK
- Department of Physiology and Pharmacology, Translational Research on Renal and Cardiovascular Diseases (TRECARD)University of Salamanca, Institute of Biomedical Research of Salamanca (IBSAL)SalamancaSpain
| | - Karen L. Price
- Developmental Biology and Cancer Research and Teaching DepartmentUCL Great Ormond Street Institute of Child HealthLondonUK
- UCL Centre for Kidney and Bladder HealthLondonUK
| | - Daniyal J. Jafree
- Developmental Biology and Cancer Research and Teaching DepartmentUCL Great Ormond Street Institute of Child HealthLondonUK
- UCL Centre for Kidney and Bladder HealthLondonUK
- Specialised Foundation Programme in ResearchNHS East of EnglandCambridgeUK
| | - Gideon Pomeranz
- Developmental Biology and Cancer Research and Teaching DepartmentUCL Great Ormond Street Institute of Child HealthLondonUK
- UCL Centre for Kidney and Bladder HealthLondonUK
| | - Maria Kolatsi‐Joannou
- Developmental Biology and Cancer Research and Teaching DepartmentUCL Great Ormond Street Institute of Child HealthLondonUK
- UCL Centre for Kidney and Bladder HealthLondonUK
| | - Carlos Martínez‐Salgado
- Department of Physiology and Pharmacology, Translational Research on Renal and Cardiovascular Diseases (TRECARD)University of Salamanca, Institute of Biomedical Research of Salamanca (IBSAL)SalamancaSpain
| | - David A. Long
- Developmental Biology and Cancer Research and Teaching DepartmentUCL Great Ormond Street Institute of Child HealthLondonUK
- UCL Centre for Kidney and Bladder HealthLondonUK
| | - Elisavet Vasilopoulou
- Developmental Biology and Cancer Research and Teaching DepartmentUCL Great Ormond Street Institute of Child HealthLondonUK
- UCL Centre for Kidney and Bladder HealthLondonUK
- Comparative Biomedical SciencesThe Royal Veterinary CollegeLondonUK
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4
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Wu KY, Cao B, Chen WB, Wu W, Zhao S, Min XY, Yang J, Han J, Dong X, Wang N, Wu Y, Garred P, Sacks SH, Zhou W, Li K. Collectin 11 has a pivotal role in host defense against kidney and bladder infection in mice. Kidney Int 2024; 105:524-539. [PMID: 38158182 DOI: 10.1016/j.kint.2023.11.031] [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: 02/24/2023] [Revised: 11/11/2023] [Accepted: 11/28/2023] [Indexed: 01/03/2024]
Abstract
The urinary tract is constantly exposed to microorganisms. Host defense mechanisms in protection from microbial colonization and development of urinary tract infections require better understanding to control kidney infection. Here we report that the lectin collectin 11 (CL-11), particularly kidney produced, has a pivotal role in host defense against uropathogen infection. CL-11 was found in mouse urine under normal and pathological conditions. Mice with global gene ablation of Colec11 had increased susceptibility to and severity of kidney and to an extent, bladder infection. Mice with kidney-specific Colec11 ablation exhibited a similar disease phenotype to that observed in global Colec11 deficient mice, indicating the importance of kidney produced CL-11 for protection against kidney and bladder infection. Conversely, intravesical or systemic administration of recombinant CL-11 reduced susceptibility to and severity of kidney and bladder infection. Mechanism analysis revealed that CL-11 can mediate several key innate defense mechanisms (agglutination, anti- adhesion, opsonophagocytosis), and limit local inflammatory responses to pathogens. Furthermore, CL-11-mediated innate defense mechanisms can act on clinically relevant microorganisms including multiple antibiotic resistant strains. CL-11 was detectable in eight of 24 urine samples from patients with urinary tract infections but not detectable in urine samples from ten healthy individuals. Thus, our findings demonstrate that CL-11 is a key factor of host defense mechanisms in kidney and bladder infection with therapeutic potential for human application.
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Affiliation(s)
- Kun-Yi Wu
- Core Research Laboratory, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Bo Cao
- Core Research Laboratory, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Wan-Bing Chen
- Core Research Laboratory, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Weiju Wu
- Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, London, UK
| | - Shujuan Zhao
- Core Research Laboratory, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Xiao-Yun Min
- Core Research Laboratory, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Jurong Yang
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jin Han
- Department of Nephrology, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Xia Dong
- Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangdong, China
| | - Na Wang
- Core Research Laboratory, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Yi Wu
- MOE Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an, China
| | - Peter Garred
- Laboratory of Molecular Medicine, Department of Clinical Immunology, Rigshospitalet and University of Copenhagen, Copenhagen, Denmark
| | - Steven H Sacks
- Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, London, UK
| | - Wuding Zhou
- Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, London, UK.
| | - Ke Li
- Core Research Laboratory, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China.
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5
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Li X, Zhu L, Zhang SY, Li J, Lin D, Wang M. Characterization of microbial contamination in agricultural soil: A public health perspective. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169139. [PMID: 38070547 DOI: 10.1016/j.scitotenv.2023.169139] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/03/2023] [Accepted: 12/04/2023] [Indexed: 01/18/2024]
Abstract
Soil is widely recognized as a reservoir of microbial contaminants including antibiotic resistance genes (ARGs) and human bacterial pathogens (HBPs), which are major public health concerns. Although the risks associated with soil safety in different soil habitats have been studied, the results are not comprehensive. In this study, dryland soils used for vegetable, corn, and soybean planting, and submerged soils used for rice planting and crab farming were collected and subjected to metagenomic sequencing to characterize HBPs, ARGs, and virulence factor genes (VFGs). The results showed that submerged soils had a higher abundance of HBP than dryland soils. In addition, the submerged soil microbiome acquired significantly higher levels of high-risk ARGs than the dryland soil microbiome and these ARGs were mainly assigned to bacA, sul1, and aadA genes submerged. Network analysis revealed that 11 HBPs, including Yersinia enterocolitica, Vibrio cholerae, Escherichia coli, and Leptospira interrogans, were high-risk because of their close association with ARGs, VFGs, and mobile genetic elements (MGEs). Procrustes and network analyses showed that HBPs and ARGs were more closely linked in submerged soil. This study confirms that submerged field has higher ecological environment risk and human health risk than dryland soil.
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Affiliation(s)
- Xiaodi Li
- International Science and Technology Cooperation Platform for Low-Carbon Recycling of Waste and Green Development & Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Lin Zhu
- International Science and Technology Cooperation Platform for Low-Carbon Recycling of Waste and Green Development & Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Si-Yu Zhang
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Jingpeng Li
- International Science and Technology Cooperation Platform for Low-Carbon Recycling of Waste and Green Development & Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Da Lin
- International Science and Technology Cooperation Platform for Low-Carbon Recycling of Waste and Green Development & Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Meizhen Wang
- International Science and Technology Cooperation Platform for Low-Carbon Recycling of Waste and Green Development & Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
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6
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Yang YS, Chen HJ, Chen XC, Tang HJ, Chang FJ, Huang YL, Pan YL, Kesavan DK, Chen HY, Shang HS, Kuo SC, Chen TL, Chiang MH. Elizabethkingia anophelis outer membrane vesicles as a novel vaccine candidate against infection: insights into immune response and potential for passive immunity. mSphere 2023; 8:e0040023. [PMID: 38014949 PMCID: PMC10732079 DOI: 10.1128/msphere.00400-23] [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: 07/17/2023] [Accepted: 10/13/2023] [Indexed: 11/29/2023] Open
Abstract
IMPORTANCE Elizabethkingia anophelis, a Gram-negative pathogen, causes infections such as bacteraemia, pneumonia, and neonatal meningitis. The pathogen resists most antimicrobial classes, making novel approaches urgently needed. In natural settings, Gram-negative bacteria secrete outer membrane vesicles (OMVs) that carry important molecules in the bacterial life cycle. These OMVs are enriched with proteins involved in virulence, survival, and carbohydrate metabolism, making them a promising source for vaccine development against the pathogen. This study investigated the efficacy of imipenem-induced OMVs (iOMVs) as a vaccine candidate against E. anophelis infection in a mouse pneumonia model. Mice immunized with iOMVs were completely protected during lethal-dose challenges. Passive immunization with hyperimmune sera and splenocytes conferred protection against lethal pneumonia. Further investigation is needed to understand the mechanisms underlying the protective effects of iOMV-induced passive immunity, such as the action on specific antibody subclasses or T cell subsets.
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Grants
- 109-2320-B-016-002-MY2, 110-2320-B-016-014, 111-2320-B-016-015, 112-2314-B-016-023, 112-2314-B-016-039, 112-2314-B-016-024-MY2 Ministry of Science and Technology, Taiwan (MOST)
- TSGH-E-111244, TSGH-E-112253 Tri-Service General Hospital (TSGH)
- CMNDMC11108, CMNDMC11206 Chi Mei Medical Center
- MND-MAB-110-049, MND-MAB-D-111072, MND-MAB-D-112115, MND-MAB-D-113078 MOD | Medical Affairs Bureau (MAB)
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Affiliation(s)
- Ya-Sung Yang
- Department of Internal Medicine, Division of Infectious Diseases and Tropical Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Hung-Jui Chen
- Department of Infectious Diseases, Chi Mei Medical Center, Tainan, Taiwan
| | - Xiao-Chun Chen
- Department and Graduate institute of Microbiology and Immunology, National Defense Medical Center, Taipei, Taiwan
| | - Hung-Jen Tang
- Department of Infectious Diseases, Chi Mei Medical Center, Tainan, Taiwan
| | - Fang-Ju Chang
- Department and Graduate Institute of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan
| | - Yun-Ling Huang
- Department and Graduate Institute of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan
| | - Yu-Ling Pan
- Department and Graduate Institute of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan
| | - Dinesh Kumar Kesavan
- School of Material Science, Nanyang Technological University, Singapore, Singapore
| | - Huan-Yuan Chen
- Inflammation Core Facility, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Hung-Sheng Shang
- Department of Pathology, Division of Clinical Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Shu-Chen Kuo
- National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Zhunan, Taiwan
| | - Te-Li Chen
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
| | - Ming-Hsien Chiang
- Department and Graduate Institute of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan
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Wang C, Cheng H, Yan F, Zhang H, Zhang J, Li C, Zhao M, Shi D, Xiong H. MicroRNA-146b protects kidney injury during urinary tract infections by modulating macrophage polarization. mBio 2023; 14:e0209423. [PMID: 37909731 PMCID: PMC10870822 DOI: 10.1128/mbio.02094-23] [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: 08/08/2023] [Accepted: 09/14/2023] [Indexed: 11/03/2023] Open
Abstract
IMPORTANCE Kidney injury during acute urinary tract infections (UTIs) caused by uropathogenic Escherichia coli (UPEC) is an important public health problem. However, how kidney injury develops during UPEC infection is still unclear. Although antibiotic therapy is currently an effective treatment for UTI, it cannot avoid kidney injury. MicroRNAs have gained extensive attention as essential molecules capable of regulating the autoimmune response. Among these, microRNA-146b (miR-146b) is involved in regulating inflammatory responses. In the present study, we demonstrated that miR-146b played an essential role in the development of kidney injury during UTIs caused by UPEC. The results showed that miR-146b may suppress M1 macrophage polarization and alleviate acute kidney injury. Furthermore, the miR-146b activator, agomir, in order to upregulate miR-146b, was effective in treating kidney damage by inhibiting the activation of M1 macrophages. In conclusion, our findings elucidated the mechanisms by which miR-146b alleviated kidney injury induced by UTIs, shed new light on the relationship between microRNA and bacterial infection, and provided a novel therapeutic target for treating this common bacterial infection.
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Affiliation(s)
- Changying Wang
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Jining Key Laboratory of Immunology, Jining Medical University, Jining, China
| | - Hongyan Cheng
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Fenglian Yan
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Jining Key Laboratory of Immunology, Jining Medical University, Jining, China
| | - Hui Zhang
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Jining Key Laboratory of Immunology, Jining Medical University, Jining, China
| | - Junfeng Zhang
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Jining Key Laboratory of Immunology, Jining Medical University, Jining, China
| | - Chunxia Li
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Jining Key Laboratory of Immunology, Jining Medical University, Jining, China
| | - Mingsheng Zhao
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Jining Key Laboratory of Immunology, Jining Medical University, Jining, China
| | - Dongmei Shi
- Department of Dermatology and Laboratory of Medical Mycology, Jining No. 1 People’s Hospital, Jining, Shandong, China
| | - Huabao Xiong
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, China
- Jining Key Laboratory of Immunology, Jining Medical University, Jining, China
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8
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Yu S, Lv L, Li Y, Ning Q, Liu T, Hu T. PLK3 promotes the proneural-mesenchymal transition in glioblastoma via transcriptional regulation of C5AR1. Mol Biol Rep 2023; 50:8249-8258. [PMID: 37568042 DOI: 10.1007/s11033-023-08716-7] [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: 02/19/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023]
Abstract
BACKGROUND Accumulating evidence suggests that polo-like kinase 3 (PLK3) plays an essential role in tumor cells and induces cell proliferation and may have implications for the prognosis of various cancers. We sought to define the role of PLK3-dependent proneural-mesenchymal transition (PMT) in the glioblastoma (GBM) therapy. METHODS AND RESULTS We analyzed the expression data for PLK3 by using the TCGA database. PLK3 expression in GBM cell lines was determined by qRT-PCR and Western blotting. PLK3 levels were modulated using Lentivirus infection, and the effects on symptoms, tumor volume, and survival in mice intracranial xenograft models were determined. Irradiation (IR) was performed to induce PMT. PLK3 expression was significantly elevated in mesenchymal subtype GBM and promoted tumor proliferation in GBM. Additionally enriched PLK3 expression could be associated with poor prognosis in GBM patients compared with those who have lower PLK3 expression. Mechanically, PLK3-dependent PMT induced radioresistance in GBM cells via transcriptional regulation of complement C5a receptor 1 (C5AR1). In therapeutic experiments conducted in vitro, targeting PLK3 by using small molecule inhibitor decreased tumor growth and radioresistance of GBM cells both in vitro and in vivo. CONCLUSIONS PLK3-C5AR1 axis induced PMT thus enhanced radioresistance in GBM and could become a novel potential therapeutic target for GBM.
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Affiliation(s)
- Shuo Yu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710000, Shaanxi, China
- Department of General Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710000, Shaanxi, China
| | - Lin Lv
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710000, Shaanxi, China
| | - Yang Li
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710000, Shaanxi, China
| | - Qian Ning
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710000, Shaanxi, China
| | - Tingting Liu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710000, Shaanxi, China
| | - Tinghua Hu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710000, Shaanxi, China.
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9
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Jeon Y, Chow SH, Stuart I, Weir A, Yeung AT, Hale C, Sridhar S, Dougan G, Vince JE, Naderer T. FBXO11 governs macrophage cell death and inflammation in response to bacterial toxins. Life Sci Alliance 2023; 6:e202201735. [PMID: 36977592 PMCID: PMC10053445 DOI: 10.26508/lsa.202201735] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 03/19/2023] [Accepted: 03/20/2023] [Indexed: 03/30/2023] Open
Abstract
Staphylococcus aureus causes severe infections such as pneumonia and sepsis depending on the pore-forming toxin Panton-Valentine leukocidin (PVL). PVL kills and induces inflammation in macrophages and other myeloid cells by interacting with the human cell surface receptor, complement 5a receptor 1 (C5aR1). C5aR1 expression is tighly regulated and may thus modulate PVL activity, although the mechanisms involved remain incompletely understood. Here, we used a genome-wide CRISPR/Cas9 screen and identified F-box protein 11 (FBXO11), an E3 ubiquitin ligase complex member, to promote PVL toxicity. Genetic deletion of FBXO11 reduced the expression of C5aR1 at the mRNA level, whereas ectopic expression of C5aR1 in FBXO11-/- macrophages, or priming with LPS, restored C5aR1 expression and thereby PVL toxicity. In addition to promoting PVL-mediated killing, FBXO11 dampens secretion of IL-1β after NLRP3 activation in response to bacterial toxins by reducing mRNA levels in a BCL-6-dependent and BCL-6-independent manner. Overall, these findings highlight that FBXO11 regulates C5aR1 and IL-1β expression and controls macrophage cell death and inflammation following PVL exposure.
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Affiliation(s)
- Yusun Jeon
- Department of Biochemistry & Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Seong H Chow
- Department of Biochemistry & Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Isabella Stuart
- Department of Biochemistry & Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Ashley Weir
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia
- The Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Amy Ty Yeung
- The Wellcome Sanger Institute, Wellcome Trust Genome Campus, Cambridge, UK
| | - Christine Hale
- The Wellcome Sanger Institute, Wellcome Trust Genome Campus, Cambridge, UK
- Department of Medicine, University of Cambridge, Cambridge, UK
| | - Sushmita Sridhar
- The Wellcome Sanger Institute, Wellcome Trust Genome Campus, Cambridge, UK
- Department of Medicine, University of Cambridge, Cambridge, UK
| | - Gordon Dougan
- The Wellcome Sanger Institute, Wellcome Trust Genome Campus, Cambridge, UK
- Department of Medicine, University of Cambridge, Cambridge, UK
| | - James E Vince
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia
- The Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Thomas Naderer
- Department of Biochemistry & Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
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10
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Trambas IA, Coughlan MT, Tan SM. Therapeutic Potential of Targeting Complement C5a Receptors in Diabetic Kidney Disease. Int J Mol Sci 2023; 24:ijms24108758. [PMID: 37240105 DOI: 10.3390/ijms24108758] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 04/26/2023] [Accepted: 04/28/2023] [Indexed: 05/28/2023] Open
Abstract
Diabetic kidney disease (DKD) affects 30-40% of patients with diabetes and is currently the leading cause of end-stage renal disease (ESRD). The activation of the complement cascade, a highly conserved element of the innate immune system, has been implicated in the pathogenesis of diabetes and its complications. The potent anaphylatoxin C5a is a critical effector of complement-mediated inflammation. Excessive activation of the C5a-signalling axis promotes a potent inflammatory environment and is associated with mitochondrial dysfunction, inflammasome activation, and the production of reactive oxygen species. Conventional renoprotective agents used in the treatment of diabetes do not target the complement system. Mounting preclinical evidence indicates that inhibition of the complement system may prove protective in DKD by reducing inflammation and fibrosis. Targeting the C5a-receptor signaling axis is of particular interest, as inhibition at this level attenuates inflammation while preserving the critical immunological defense functions of the complement system. In this review, the important role of the C5a/C5a-receptor axis in the pathogenesis of diabetes and kidney injuries will be discussed, and an overview of the status and mechanisms of action of current complement therapeutics in development will be provided.
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Affiliation(s)
- Inez A Trambas
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, VIC 3004, Australia
| | - Melinda T Coughlan
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, VIC 3004, Australia
| | - Sih Min Tan
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, VIC 3004, Australia
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11
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Liu C, Tang L, Zhou Y, Tang X, Zhang G, Zhu Q, Zhou Y. Immune-associated biomarkers identification for diagnosing carotid plaque progression with uremia through systematical bioinformatics and machine learning analysis. Eur J Med Res 2023; 28:92. [PMID: 36823662 PMCID: PMC9948329 DOI: 10.1186/s40001-023-01043-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 02/04/2023] [Indexed: 02/25/2023] Open
Abstract
BACKGROUND Uremia is one of the most challenging problems in medicine and an increasing public health issue worldwide. Patients with uremia suffer from accelerated atherosclerosis, and atherosclerosis progression may trigger plaque instability and clinical events. As a result, cardiovascular and cerebrovascular complications are more likely to occur. This study aimed to identify diagnostic biomarkers in uremic patients with unstable carotid plaques (USCPs). METHODS Four microarray datasets (GSE37171, GSE41571, GSE163154, and GSE28829) were downloaded from the NCBI Gene Expression Omnibus database. The Limma package was used to identify differentially expressed genes (DEGs) in uremia and USCP. Weighted gene co-expression network analysis (WGCNA) was used to determine the respective significant module genes associated with uremia and USCP. Moreover, a protein-protein interaction (PPI) network and three machine learning algorithms were applied to detect potential diagnostic genes. Subsequently, a nomogram and a receiver operating characteristic curve (ROC) were plotted to diagnose USCP with uremia. Finally, immune cell infiltrations were further analyzed. RESULTS Using the Limma package and WGCNA, the intersection of 2795 uremia-related DEGs and 1127 USCP-related DEGs yielded 99 uremia-related DEGs in USCP. 20 genes were selected as candidate hub genes via PPI network construction. Based on the intersection of genes from the three machine learning algorithms, three hub genes (FGR, LCP1, and C5AR1) were identified and used to establish a nomogram that displayed a high diagnostic performance (AUC: 0.989, 95% CI 0.971-1.000). Dysregulated immune cell infiltrations were observed in USCP, showing positive correlations with the three hub genes. CONCLUSION The current study systematically identified three candidate hub genes (FGR, LCP1, and C5AR1) and established a nomogram to assist in diagnosing USCP with uremia using various bioinformatic analyses and machine learning algorithms. Herein, the findings provide a foothold for future studies on potential diagnostic candidate genes for USCP in uremic patients. Additionally, immune cell infiltration analysis revealed that the dysregulated immune cell proportions were identified, and macrophages could have a critical role in USCP pathogenesis.
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Affiliation(s)
- Chunjiang Liu
- grid.415644.60000 0004 1798 6662Department of General Surgery, Division of Vascular Surgery, Shaoxing People’s Hospital (Shaoxing Hospital of Zhejiang University), Shaoxing, 312000 China
| | - Liming Tang
- grid.415644.60000 0004 1798 6662Department of General Surgery, Division of Vascular Surgery, Shaoxing People’s Hospital (Shaoxing Hospital of Zhejiang University), Shaoxing, 312000 China
| | - Yue Zhou
- grid.415644.60000 0004 1798 6662Department of General Surgery, Division of Vascular Surgery, Shaoxing People’s Hospital (Shaoxing Hospital of Zhejiang University), Shaoxing, 312000 China
| | - Xiaoqi Tang
- grid.415644.60000 0004 1798 6662Department of General Surgery, Division of Vascular Surgery, Shaoxing People’s Hospital (Shaoxing Hospital of Zhejiang University), Shaoxing, 312000 China
| | - Gang Zhang
- grid.412679.f0000 0004 1771 3402Department of Rehabilitation, The First Affiliated Hospital of Anhui Medical University, Anhui Public Health Clinical Center, Hefei, 230000 Anhui China
| | - Qin Zhu
- Hepatobiliary CenterKey Laboratory of Liver TransplantationNHC Key Laboratory of Living Donor Liver Transplantation, The First Affiliated Hospital of Nanjing Medical UniversityChinese Academy of Medical SciencesNanjing Medical University), Nanjing, 210000, Jiangsu, China.
| | - Yufei Zhou
- Shanghai Medical College, Fudan University, Shanghai, 200032, China.
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12
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Gospodinova KO, Olsen D, Kaas M, Anderson SM, Phillips J, Walker RM, Bermingham ML, Payne AL, Giannopoulos P, Pandya D, Spires-Jones TL, Abbott CM, Porteous DJ, Glerup S, Evans KL. Loss of SORCS2 is Associated with Neuronal DNA Double-Strand Breaks. Cell Mol Neurobiol 2023; 43:237-249. [PMID: 34741697 PMCID: PMC9813074 DOI: 10.1007/s10571-021-01163-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 10/29/2021] [Indexed: 01/09/2023]
Abstract
SORCS2 is one of five proteins that constitute the Vps10p-domain receptor family. Members of this family play important roles in cellular processes linked to neuronal survival, differentiation and function. Genetic and functional studies implicate SORCS2 in cognitive function, as well as in neurodegenerative and psychiatric disorders. DNA damage and DNA repair deficits are linked to ageing and neurodegeneration, and transient neuronal DNA double-strand breaks (DSBs) also occur as a result of neuronal activity. Here, we report a novel role for SORCS2 in DSB formation. We show that SorCS2 loss is associated with elevated DSB levels in the mouse dentate gyrus and that knocking out SORCS2 in a human neuronal cell line increased Topoisomerase IIβ-dependent DSB formation and reduced neuronal viability. Neuronal stimulation had no impact on levels of DNA breaks in vitro, suggesting that the observed differences may not be the result of aberrant neuronal activity in these cells. Our findings are consistent with studies linking the VPS10 receptors and DNA damage to neurodegenerative conditions.
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Affiliation(s)
- Katerina O. Gospodinova
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Ditte Olsen
- Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | - Mathias Kaas
- Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | - Susan M. Anderson
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Jonathan Phillips
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Rosie M. Walker
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK ,Present Address: University of Edinburgh, Chancellor’s Building, 49, Edinburgh, EH16 4SB UK
| | - Mairead L. Bermingham
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Abigail L. Payne
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Panagiotis Giannopoulos
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Divya Pandya
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Tara L. Spires-Jones
- Centre for Discovery Brain Sciences, UK Dementia Research Institute, University of Edinburgh, Edinburgh, EH8 9XD UK
| | - Catherine M. Abbott
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - David J. Porteous
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
| | - Simon Glerup
- Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | - Kathryn L. Evans
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU UK
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13
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Zhao SJ, Wu KY, Min XY, Wang CX, Cao B, Ma N, Yang XL, Zhu ZR, Fu RG, Zhou W, Yang JR, Li K. Protective role for C3aR in experimental chronic pyelonephritis. FASEB J 2022; 36:e22599. [PMID: 36250902 DOI: 10.1096/fj.202201007r] [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: 06/30/2022] [Revised: 09/05/2022] [Accepted: 09/26/2022] [Indexed: 11/11/2022]
Abstract
Emerging evidence suggest that C3aR plays important roles in homeostasis, host defense and disease. Although it is known that C3aR is protective in several models of acute bacterial infections, the role for C3aR in chronic infection is largely unknown. Here we show that C3aR is protective in experimental chronic pyelonephritis. Global C3aR deficient (C3ar-/- ) mice had higher renal bacterial load, more pronounced renal histological lesions, increased renal apoptotic cell accumulation, tissue inflammation and extracellular matrix deposition following renal infection with uropathogenic E. coli (UPEC) strain IH11128, compared to WT control mice. Myeloid C3aR deficient (Lyz2-C3ar-/- ) mice exhibited a similar disease phenotype to global C3ar-/- mice. Pharmacological treatment with a C3aR agonist reduced disease severity in experimental chronic pyelonephritis. Furthermore, macrophages of C3ar-/- mice exhibited impaired ability to phagocytose UPEC. Our data clearly demonstrate a protective role for C3aR against experimental chronic pyelonephritis, macrophage C3aR plays a major role in the protection, and C3aR is necessary for phagocytosis of UPEC by macrophages. Our observation that C3aR agonist curtailed the pathology suggests a therapeutic potential for activation of C3aR in chronic infection.
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Affiliation(s)
- Shu-Juan Zhao
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Kun-Yi Wu
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Xiao-Yun Min
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Chun-Xuan Wang
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Bo Cao
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Ning Ma
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Xue-Ling Yang
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhuo-Ran Zhu
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Rong-Guo Fu
- Department of Nephrology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Wuding Zhou
- Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, Faculty of Life Sciences & Medicine, King's College, London, UK
| | - Ju-Rong Yang
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ke Li
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
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Interactions of Bacterial Toxin CNF1 and Host JAK1/2 Driven by Liquid-Liquid Phase Separation Enhance Macrophage Polarization. mBio 2022; 13:e0114722. [PMID: 35766380 PMCID: PMC9426534 DOI: 10.1128/mbio.01147-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Urinary tract infections (UTIs) are a global public health concern, which is mainly caused by uropathogenic Escherichia coli (UPEC). Cytotoxic necrotizing factor 1 (CNF1) is a key UPEC toxin and regulates multiple host cellular processes through activating the Rho GTPases; however, the effect of CNF1 on macrophage polarization remains unknown. Here, we found that CNF1 promoted M1 macrophage polarization through regulating NF-κB and JAK-STAT1 signaling pathways in kidney at an early stage of acute UTIs. Notably, we identified CNF1 could directly interact with JAK1/2 through its domain without Rho GTPases activation, which induced JAK1/2 phosphorylation, subsequent STAT1 activation and M1 polarization. Moreover, CNF1 exhibited liquid-liquid phase separation (LLPS) to induce a CNF1-JAK1/2 complex, promoting macrophage reprogramming. These findings highlight the LLPS-dependent and Rho GTPase-independent effect of CNF1 as an adaptor on interfering with host cell signals.
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15
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Butler D, Ambite I, Wan MLY, Tran TH, Wullt B, Svanborg C. Immunomodulation therapy offers new molecular strategies to treat UTI. Nat Rev Urol 2022; 19:419-437. [PMID: 35732832 PMCID: PMC9214477 DOI: 10.1038/s41585-022-00602-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/22/2022] [Indexed: 12/13/2022]
Abstract
Innovative solutions are needed for the treatment of bacterial infections, and a range of antibacterial molecules have been explored as alternatives to antibiotics. A different approach is to investigate the immune system of the host for new ways of making the antibacterial defence more efficient. However, the immune system has a dual role as protector and cause of disease: in addition to being protective, increasing evidence shows that innate immune responses can become excessive and cause acute symptoms and tissue pathology during infection. This role of innate immunity in disease suggests that the immune system should be targeted therapeutically, to inhibit over-reactivity. The ultimate goal is to develop therapies that selectively attenuate destructive immune response cascades, while augmenting the protective antimicrobial defence but such treatment options have remained underexplored, owing to the molecular proximity of the protective and destructive effects of the immune response. The concept of innate immunomodulation therapy has been developed successfully in urinary tract infections, based on detailed studies of innate immune activation and disease pathogenesis. Effective, disease-specific, immunomodulatory strategies have been developed by targeting specific immune response regulators including key transcription factors. In acute pyelonephritis, targeting interferon regulatory factor 7 using small interfering RNA or treatment with antimicrobial peptide cathelicidin was protective and, in acute cystitis, targeting overactive effector molecules such as IL-1β, MMP7, COX2, cAMP and the pain-sensing receptor NK1R has been successful in vivo. Furthermore, other UTI treatment strategies, such as inhibiting bacterial adhesion and vaccination, have also shown promise. Hyperactivation of innate immunity is a disease determinant in urinary tract infections (UTIs). Modulation of innate immunity has promise as a therapy for UTIs. In this Review, the authors discuss potential mechanisms and immunomodulatory therapeutic strategies in UTIs. Excessive innate immune responses to infection cause symptoms and pathology in acute pyelonephritis and acute cystitis. Innate immunomodulation therapy is, therefore, a realistic option for treating these conditions. Targeting excessive innate immune responses at the level of transcription has been successful in animal models. Innate immunomodulation therapy reduces excessive inflammation and tissue pathology and accelerates bacterial clearance from infected kidneys and bladders in mice. Innate immunomodulation therapy also accelerates the clearance of antibiotic-resistant bacterial strains.
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Affiliation(s)
- Daniel Butler
- Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Ines Ambite
- Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Murphy Lam Yim Wan
- Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Thi Hien Tran
- Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Björn Wullt
- Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Catharina Svanborg
- Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden.
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16
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Studies on Virulence and Extended-Spectrum β-Lactamase-Producing Uropathogenic Escherichia coli Isolates and Therapeutic Effect of Fosfomycin in Acute Pyelonephritis Mice. BIOMED RESEARCH INTERNATIONAL 2022; 2022:8334153. [PMID: 35141335 PMCID: PMC8818418 DOI: 10.1155/2022/8334153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/26/2021] [Accepted: 01/11/2022] [Indexed: 02/08/2023]
Abstract
The understanding about virulence factors (VFs) and the drug resistance of uropathogenic Escherichia coli (UPEC) helps us understand the pathogenesis of urinary tract infections (UTIs) and make better decisions for clinical treatment. This study examined the correlation between the extended-spectrum β-lactamases (ESBLs) phenotype and VFs in UPEC strains. In addition, we validated the therapeutic potential of fosfomycin in acute pyelonephritis mice. From May 2017 to November 2018, 22 nonduplicate E coli. strains were isolated from UTI patients. PCR was utilized to detect the distribution of virulence genes. We also analyzed the ESBL phenotype in E coli. We further evaluated the therapeutic effect of intravenous fosfomycin treatment in the acute pyelonephritis (APN) model. All 22 UPEC strains expressed the type 1 fimbriae (FimH) gene and more than 50% (12/22) of strains produced ESBLs. The detection rates of the iron acquisition-associated genes ChuT and IutA were 77.3% (n = 17) and 50% (n = 11) and those of P fimbria papA and papC genes were 45% (n = 10) and 50% (n = 11), respectively. Though the VFs were closely related with pathologenicity, the relationship between VFs and ESBLs still needs further investigation. Furthermore, intravenous fosfomycin 800 mg/kg significantly reduced the bacterial load and the inflammatory infiltration in the bladder and kidney, maintaining the structural integrity of the kidney. Intravenous fosfomycin administration can be used for the treatment of acute pyelonephritis caused by highly pathogenic and drug-resistant UPEC strains.
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17
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Wu KY, Cao B, Wang CX, Yang XL, Zhao SJ, Diao TY, Lin LR, Zhao GX, Zhou W, Yang JR, Li K. The C5a/C5aR1 Axis Contributes to the Pathogenesis of Acute Cystitis Through Enhancement of Adhesion and Colonization of Uropathogenic E. coli. Front Cell Infect Microbiol 2022; 12:824505. [PMID: 35433513 PMCID: PMC9005882 DOI: 10.3389/fcimb.2022.824505] [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: 11/29/2021] [Accepted: 02/18/2022] [Indexed: 12/02/2022] Open
Abstract
Our previous work using a murine model of pyelonephritis demonstrated that the C5a/C5aR1 axis plays a pathogenic role in acute kidney infection. In this study, we report that the C5a/C5aR1 axis also plays a pathogenic role in acute bladder infection. C5aR1-deficient mice had reduced bladder bacterial load and attenuated bladder tissue injury, which is associated with reduced expression of terminal α-mannosyl residues (Man) (a potential ligand for type 1 fimbriae of E. coli) at the luminal surface of the bladder epithelium and reduced early bacterial colonization of the bladder. In vitro, C5a stimulation enhanced mannose expression in and facilitated bacterial adhesion/colonization to human bladder epithelial cells. C5a stimulation also upregulated the activation of ERK1/2 and NF-κB signaling and gene expression of proinflammatory cytokines (i.e., Il6, Il1b, Cxcl1, Ccl2) in the epithelial cells, which could drive pro-inflammatory responses leading to tissue injury. Administration of the C5aR1 antagonist effectively reduced bladder bacterial load and tissue injury. Thus, our findings demonstrate a previously unknown pathogenic role for the C5a/C5aR1 axis in bladder infection and suggest that the C5a/C5aR1 axis-mediated upregulation of Man expression, enhancement of bacterial adhesion/colonization, and excessive inflammatory responses contribute to acute bladder infection. These findings improve our understanding of the pathogenesis of bladder infection with therapeutic implications for UTI.
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Affiliation(s)
- Kun-Yi Wu
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Bo Cao
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Chun-Xuan Wang
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xue-Ling Yang
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Shu-Juan Zhao
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Teng-Yue Diao
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Li-Rong Lin
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Guo-Xiu Zhao
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Wuding Zhou
- Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, London, United Kingdom
| | - Ju-Rong Yang
- Department of Nephrology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ke Li
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
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18
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Biyashev B, Biyashev K, Bulegenova M, Kirkimbaeva Z, Zhylkaidar A. Determination of prophylactic and therapeutic effectiveness of probiotic strain Escherichia coli 39-SN. J Med Life 2022; 15:20-25. [PMID: 35186132 PMCID: PMC8852633 DOI: 10.25122/jml-2021-0118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 10/21/2021] [Indexed: 01/17/2023] Open
Abstract
At present, it is relevant to preserve and raise healthy, well-developed newborn animals adapted to new conditions, which form the basis for increasing the yield of animal husbandry. Gastrointestinal diseases cause the main losses of young animals. Acute gastrointestinal diseases of calves, lambs, piglets, and chickens are widespread in Kazakhstan. The study aims to develop a competitive treatment and prophylactic drug composition based on probiotic bacterial strains. Modern certified and standardized biochemical, microbiological, molecular biological studies were considered during the research. The morphological, cultural, and biochemical properties of the cultures were studied according to generally accepted schemes. Standard methods of finding averages and their mean errors were used for the mathematical processing of results. Antibiotics, sulfonamide, and nitrofuran drugs are the most common methods to combat diseases in young animals. However, the use of antibacterial agents often leads to the death of normal microflora, disrupting the microbiocenosis of the gastrointestinal tract, the appearance of microorganisms with resistance to drugs, and a decrease in product quality. In this regard, the direction of biotechnology involved in the development and creation of environmentally friendly microbial preparations with prophylactic effectiveness is very relevant. Data on the prophylactic and therapeutic efficacy of the probiotic strain of Escherichia coli 39-SN are presented.
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Affiliation(s)
- Birzhan Biyashev
- Department of Microbiology, Virology, and Immunology, Kazakh National Agrarian Research University, Almaty, Republic of Kazakhstan,* Corresponding Author: Birzhan Biyashev, Department of Microbiology, Virology, and Immunology, Kazakh National Agrarian Research University, Almaty, Republic of Kazakhstan. E-mail:
| | - Kadyr Biyashev
- Department of Microbiology, Virology, and Immunology, Kazakh National Agrarian Research University, Almaty, Republic of Kazakhstan
| | - Madina Bulegenova
- Department of Microbiology, Virology, and Immunology, Kazakh National Agrarian Research University, Almaty, Republic of Kazakhstan
| | - Zhumagul Kirkimbaeva
- Department of Microbiology, Virology, and Immunology, Kazakh National Agrarian Research University, Almaty, Republic of Kazakhstan
| | - Arman Zhylkaidar
- Department of Microbiology, Virology, and Immunology, Kazakh National Agrarian Research University, Almaty, Republic of Kazakhstan
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TcpC inhibits toll-like receptor signaling pathway by serving as an E3 ubiquitin ligase that promotes degradation of myeloid differentiation factor 88. PLoS Pathog 2021; 17:e1009481. [PMID: 33788895 PMCID: PMC8041205 DOI: 10.1371/journal.ppat.1009481] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 04/12/2021] [Accepted: 03/17/2021] [Indexed: 12/11/2022] Open
Abstract
TcpC is a virulence factor of uropathogenic E. coli (UPEC). It was found that TIR domain of TcpC impedes TLR signaling by direct association with MyD88. It has been a long-standing question whether bacterial pathogens have evolved a mechanism to manipulate MyD88 degradation by ubiquitin-proteasome pathway. Here, we show that TcpC is a MyD88-targeted E3 ubiquitin ligase. Kidney macrophages from mice with pyelonephritis induced by TcpC-secreting UPEC showed significantly decreased MyD88 protein levels. Recombinant TcpC (rTcpC) dose-dependently inhibited protein but not mRNA levels of MyD88 in macrophages. Moreover, rTcpC significantly promoted MyD88 ubiquitination and accumulation in proteasomes in macrophages. Cys12 and Trp106 in TcpC are crucial amino acids in maintaining its E3 activity. Therefore, TcpC blocks TLR signaling pathway by degradation of MyD88 through ubiquitin-proteasome system. Our findings provide not only a novel biochemical mechanism underlying TcpC-medicated immune evasion, but also the first example that bacterial pathogens inhibit MyD88-mediated signaling pathway by virulence factors that function as E3 ubiquitin ligase. Toll/interleukin-1 receptor domain-containing protein encoded by E. coli (TcpC) is an important virulence factor in many strains of uropathogenic E. coli (UPEC). TcpC-mediated evasion of innate immunity plays an important role in the pathogenesis of UPEC caused urinary tract infection (UTI) including pyelonephritis. In the present study, we show TcpC is an E3 ubiquitin ligase that promotes ubiquitination and degradation of MyD88, hereby blocking the TLR signaling pathway. Our findings not only illuminate the novel biochemical mechanisms underlying TcpC-mediated evasion of innate immunity, but also provide the first example that bacterial pathogens can subvert TLR signaling pathway through virulence factors that function as MyD88-targeted E3 ubiquitin ligase.
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McLellan LK, McAllaster MR, Kim AS, Tóthová Ľ, Olson PD, Pinkner JS, Daugherty AL, Hreha TN, Janetka JW, Fremont DH, Hultgren SJ, Virgin HW, Hunstad DA. A host receptor enables type 1 pilus-mediated pathogenesis of Escherichia coli pyelonephritis. PLoS Pathog 2021; 17:e1009314. [PMID: 33513212 PMCID: PMC7875428 DOI: 10.1371/journal.ppat.1009314] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 02/10/2021] [Accepted: 01/13/2021] [Indexed: 12/26/2022] Open
Abstract
Type 1 pili have long been considered the major virulence factor enabling colonization of the urinary bladder by uropathogenic Escherichia coli (UPEC). The molecular pathogenesis of pyelonephritis is less well characterized, due to previous limitations in preclinical modeling of kidney infection. Here, we demonstrate in a recently developed mouse model that beyond bladder infection, type 1 pili also are critical for establishment of ascending pyelonephritis. Bacterial mutants lacking the type 1 pilus adhesin (FimH) were unable to establish kidney infection in male C3H/HeN mice. We developed an in vitro model of FimH-dependent UPEC binding to renal collecting duct cells, and performed a CRISPR screen in these cells, identifying desmoglein-2 as a primary renal epithelial receptor for FimH. The mannosylated extracellular domain of human DSG2 bound directly to the lectin domain of FimH in vitro, and introduction of a mutation in the FimH mannose-binding pocket abolished binding to DSG2. In infected C3H/HeN mice, type 1-piliated UPEC and Dsg2 were co-localized within collecting ducts, and administration of mannoside FIM1033, a potent small-molecule inhibitor of FimH, significantly attenuated bacterial loads in pyelonephritis. Our results broaden the biological importance of FimH, specify the first renal FimH receptor, and indicate that FimH-targeted therapeutics will also have application in pyelonephritis. Urinary tract infections (UTIs) are among the most common bacterial infections in humans. While much has been discovered about how E. coli cause bladder infections, less is known about the host-pathogen interactions that underlie kidney infection (pyelonephritis). We employed recently developed mouse models to show that bacterial surface fibers called type 1 pili, which bear the adhesive protein FimH and are known to mediate E. coli binding to bladder epithelium, are also required for ascending kidney infection. We developed a cell-culture model of bacterial binding to renal collecting duct, then performed a screen using the gene-editing tool CRISPR to identify the first known FimH receptor in the kidney. This epithelial cell-surface protein, desmoglein-2, was shown to directly bind FimH, and we localized this binding to specific extracellular domains of DSG2. Further, we showed that mannosides, small-molecule FimH inhibitors currently in development to treat bladder infection, are also effective in experimental kidney infection. Our study reveals a novel host-pathogen interaction during pyelonephritis and demonstrates how this interaction may be therapeutically targeted.
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Affiliation(s)
- Lisa K. McLellan
- Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Michael R. McAllaster
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Arthur S. Kim
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, United States of America
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Ľubomíra Tóthová
- Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Patrick D. Olson
- Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri, United States of America
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Jerome S. Pinkner
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Allyssa L. Daugherty
- Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Teri N. Hreha
- Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - James W. Janetka
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Daved H. Fremont
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, United States of America
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Scott J. Hultgren
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Herbert W. Virgin
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, United States of America
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - David A. Hunstad
- Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri, United States of America
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America
- * E-mail:
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Ambite I, Butler D, Wan MLY, Rosenblad T, Tran TH, Chao SM, Svanborg C. Molecular determinants of disease severity in urinary tract infection. Nat Rev Urol 2021; 18:468-486. [PMID: 34131331 PMCID: PMC8204302 DOI: 10.1038/s41585-021-00477-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/07/2021] [Indexed: 02/06/2023]
Abstract
The most common and lethal bacterial pathogens have co-evolved with the host. Pathogens are the aggressors, and the host immune system is responsible for the defence. However, immune responses can also become destructive, and excessive innate immune activation is a major cause of infection-associated morbidity, exemplified by symptomatic urinary tract infections (UTIs), which are caused, in part, by excessive innate immune activation. Severe kidney infections (acute pyelonephritis) are a major cause of morbidity and mortality, and painful infections of the urinary bladder (acute cystitis) can become debilitating in susceptible patients. Disease severity is controlled at specific innate immune checkpoints, and a detailed understanding of their functions is crucial for strategies to counter microbial aggression with novel treatment and prevention measures. One approach is the use of bacterial molecules that reprogramme the innate immune system, accelerating or inhibiting disease processes. A very different outcome is asymptomatic bacteriuria, defined by low host immune responsiveness to bacteria with attenuated virulence. This observation provides the rationale for immunomodulation as a new therapeutic tool to deliberately modify host susceptibility, control the host response and avoid severe disease. The power of innate immunity as an arbitrator of health and disease is also highly relevant for emerging pathogens, including the current COVID-19 pandemic.
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Affiliation(s)
- Ines Ambite
- grid.4514.40000 0001 0930 2361Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Daniel Butler
- grid.4514.40000 0001 0930 2361Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Murphy Lam Yim Wan
- grid.4514.40000 0001 0930 2361Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Therese Rosenblad
- grid.4514.40000 0001 0930 2361Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Thi Hien Tran
- grid.4514.40000 0001 0930 2361Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
| | - Sing Ming Chao
- Nephrology Service, Department of Paediatrics, KK Hospital, Singapore, Singapore
| | - Catharina Svanborg
- grid.4514.40000 0001 0930 2361Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden
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Liu S, Li Y, Yue C, Zhang D, Su X, Yan X, Yang K, Chen X, Zhuo G, Cai T, Liu J, Peng X, Hou R. Isolation and characterization of Uropathogenic Escherichia coli (UPEC) from red panda (Ailurus fulgens). BMC Vet Res 2020; 16:404. [PMID: 33109179 PMCID: PMC7590469 DOI: 10.1186/s12917-020-02624-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 10/15/2020] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Disease prevention and control is a significant part in the ex-situ conservation of the endangered red panda (Ailurus fulgens), being bacterial infection is one of the most important health threats to the captive population. To date, studies about the infection caused by Escherichia coli in the red panda are scarce. This study was conducted to determine the cause of death of a captive red panda through clinical symptoms, complete blood count, biochemical analysis, pathological diagnosis and bacterial whole genome sequencing. CASE PRESENTATION The following report describes a case of a 1.5 year old captive red panda (Ailurus fulgens) that was found lethargic and anorectic. She was moved to the quarantine area for daily treatment with 50 mg of Cefpodoxime Proxetil. During the three-day treatment, she did not eat or defecate, and then died. Clinical hematology revealed the values of neutrophils, alanine aminotransferase (ALT), aspartate aminotransferase (AST) and blood urea nitrogen (BUN) were significantly higher. Histological analysis demonstrated major pathological damage in the kidneys, liver and lungs, characterized by hyperemia, parenchymal cell degeneration and necrosis and inflammatory cell infiltration which were predominantly neutrophilic. A bacterial strain confirmed as Escherichia coli was isolated post mortem. Whole genome sequencing of the E. coli showed the complete genome size was 4.99 Mbp. PapA, PapC, OmpA, OmpU and other virulence factors which specific to Uropathogenic Escherichia coli (UPEC) were found in the isolate. Among the virulence factors, P pili, type I pili and related factors of the iron uptake system were associated with nephrotoxicity. CONCLUSION The red panda died of bacterial infection caused by an uropathogenic strain of Escherichia coli. The pathogenic mechanisms of the strain are closely related to the expression of specific virulence genes.
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Affiliation(s)
- Songrui Liu
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Yunli Li
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Chanjuan Yue
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Dongsheng Zhang
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Xiaoyan Su
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Xia Yan
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Kuixing Yang
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Xin Chen
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Guifu Zhuo
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China
| | - Tong Cai
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), Nanchong, 637009, Sichuan, China
- College of Life Science, China West Normal University, Nanchong, 637009, Sichuan, China
| | - Jiangfeng Liu
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), Nanchong, 637009, Sichuan, China
- College of Life Science, China West Normal University, Nanchong, 637009, Sichuan, China
| | - Xi Peng
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), Nanchong, 637009, Sichuan, China.
- College of Life Science, China West Normal University, Nanchong, 637009, Sichuan, China.
| | - Rong Hou
- Chengdu Research Base of Giant Panda Breeding, Chengdu, 610081, Sichuan, China.
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu, 610081, Sichuan, China.
- Sichuan Academy of Giant Panda, Chengdu, 610081, Sichuan, China.
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Wei LL, Ma N, Wu KY, Wang JX, Diao TY, Zhao SJ, Bai L, Liu E, Li ZF, Zhou W, Chen D, Li K. Protective Role of C3aR (C3a Anaphylatoxin Receptor) Against Atherosclerosis in Atherosclerosis-Prone Mice. Arterioscler Thromb Vasc Biol 2020; 40:2070-2083. [PMID: 32762445 DOI: 10.1161/atvbaha.120.314150] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Emerging evidence suggests that C3aR (C3a anaphylatoxin receptor) signaling has protective roles in various inflammatory-related diseases. However, its role in atherosclerosis has been unknown. The purpose of the study was to investigate the possible protective role of C3aR in aortic atherosclerosis and explore molecular and cellular mechanisms involved in the protection. Approach and Results: C3ar-/-/Apoe-/- mice were generated by cross-breeding of atherosclerosis-prone Apoe-/- mice and C3ar-/- mice. C3ar-/-/Apoe-/- mice and Apoe-/- mice (as a control) underwent high-fat diet for 16 weeks were assessed for (1) atherosclerotic plaque burden, (2) aortic tissue inflammation, (3) recruitment of CD11b+ leukocytes into atherosclerotic lesions, and (4) systemic inflammatory responses. Compared with Apoe-/- mice, C3ar-/-/Apoe-/- mice developed more severe atherosclerosis. In addition, C3ar-/-/Apoe-/- mice have increased local production of proinflammatory mediators (eg, CCL2 [chemokine (C-C motif) ligand 2], TNF [tumor necrosis factor]-α) and infiltration of monocyte/macrophage in aortic tissue, and their lesional macrophages displayed an M1-like phenotype. Local pathological changes were associated with enhanced systemic inflammatory responses (ie, elevated plasma levels of CCL2 and TNF-α, increased circulating inflammatory cells). In vitro analyses using peritoneal macrophages showed that C3a stimulation resulted in upregulation of M2-associated signaling and molecules, but suppression of M1-associated signaling and molecules, supporting the roles of C3a/C3aR axis in mediating anti-inflammatory response and promoting M2 macrophage polarization. CONCLUSIONS Our findings demonstrate a protective role for C3aR in the development of atherosclerosis and suggest that C3aR confers the protection through C3a/C3aR axis-mediated negative regulation of proinflammatory responses and modulation of macrophage toward the anti-inflammatory phenotype.
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Affiliation(s)
- Lin-Lin Wei
- From the Core Research Laboratory (L.-L.W., N.M., K.-Y.W., J.-X.W., T.-Y.D., S.-J.Z., K.L.), Xi'an Jiaotong University, China
| | - Ning Ma
- From the Core Research Laboratory (L.-L.W., N.M., K.-Y.W., J.-X.W., T.-Y.D., S.-J.Z., K.L.), Xi'an Jiaotong University, China
| | - Kun-Yi Wu
- From the Core Research Laboratory (L.-L.W., N.M., K.-Y.W., J.-X.W., T.-Y.D., S.-J.Z., K.L.), Xi'an Jiaotong University, China
| | - Jia-Xing Wang
- From the Core Research Laboratory (L.-L.W., N.M., K.-Y.W., J.-X.W., T.-Y.D., S.-J.Z., K.L.), Xi'an Jiaotong University, China
| | - Teng-Yue Diao
- From the Core Research Laboratory (L.-L.W., N.M., K.-Y.W., J.-X.W., T.-Y.D., S.-J.Z., K.L.), Xi'an Jiaotong University, China
| | - Shu-Juan Zhao
- From the Core Research Laboratory (L.-L.W., N.M., K.-Y.W., J.-X.W., T.-Y.D., S.-J.Z., K.L.), Xi'an Jiaotong University, China
| | - Liang Bai
- The Second Affiliated Hospital and Cardiovascular Research Center, School of Basic Medical Sciences, Health Science Center (L.B., E.L.), Xi'an Jiaotong University, China
| | - Enqi Liu
- The Second Affiliated Hospital and Cardiovascular Research Center, School of Basic Medical Sciences, Health Science Center (L.B., E.L.), Xi'an Jiaotong University, China
| | - Zong-Fang Li
- National Local Joint Engineering Research Centre of Biodiagnostics and Biotherapy (Z.-F.L.), Xi'an Jiaotong University, China
| | - Wuding Zhou
- Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, Faculty of Life Sciences & Medicine (W.Z.), King's College London, United Kingdom
| | - Daxin Chen
- Department of Inflammation Biology, School of Immunology & Microbial Sciences (D.C.), King's College London, United Kingdom
| | - Ke Li
- From the Core Research Laboratory (L.-L.W., N.M., K.-Y.W., J.-X.W., T.-Y.D., S.-J.Z., K.L.), Xi'an Jiaotong University, China
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Zhang T, Wu KY, Ma N, Wei LL, Garstka M, Zhou W, Li K. The C5a/C5aR2 axis promotes renal inflammation and tissue damage. JCI Insight 2020; 5:134081. [PMID: 32191644 DOI: 10.1172/jci.insight.134081] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 03/11/2020] [Indexed: 12/11/2022] Open
Abstract
C5a is a potent inflammatory mediator that binds C5aR1 and C5aR2. Although pathogenic roles of the C5a/C5aR1 axis in inflammatory disorders are well documented, the roles for the C5a/C5aR2 axis in inflammatory disorders and underlying mechanisms remain unclear. Here, we show that the C5a/C5aR2 axis contributes to renal inflammation and tissue damage in a mouse model of acute pyelonephritis. Compared with WT littermates, C5ar2-/- mice had significantly reduced renal inflammation, tubular damage, and renal bacterial load following bladder inoculation with uropathogenic E. coli. The decrease in inflammatory responses in the kidney of C5ar2-/- mice was correlated with reduced intrarenal levels of high mobility group box-1 protein (HMGB1), NLRP3 inflammasome components, cleaved caspase-1, and IL-1β. In vitro, C5a stimulation of macrophages from C5ar1-/- mice (lacking C5aR1 but expressing C5aR2) led to significant upregulation of HMGB1 release, NLRP3/cleaved caspase-1 inflammasome activation, and IL-1β secretion. Furthermore, blockade of HMGB1 significantly reduced C5a-mediated upregulation of NLRP3/cleaved caspase-1 inflammasome activation and IL-1β secretion in the macrophages, implying a HMGB1-dependent upregulation of NLRP3/cleaved caspase-1 inflammasome activation in macrophages. Our findings demonstrate a pathogenic role for the C5a/C5aR2 axis in renal injury following renal infection and suggest that the C5a/C5aR2 axis contributes to renal inflammation and tissue damage through upregulation of HMGB1 and NLRP3/cleaved caspase-1 inflammasome.
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Affiliation(s)
- Ting Zhang
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Kun-Yi Wu
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Ning Ma
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Ling-Lin Wei
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Malgorzata Garstka
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Wuding Zhou
- Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, King's College London, London, United Kingdom
| | - Ke Li
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China.,National Local Joint Engineering Research Centre of Biodiagnostics and Biotherapy, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
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Wang C, Li Q, Lv J, Sun X, Cao Y, Yu K, Miao C, Zhang ZS, Yao Z, Wang Q. Alpha-hemolysin of uropathogenic Escherichia coli induces GM-CSF-mediated acute kidney injury. Mucosal Immunol 2020; 13:22-33. [PMID: 31719643 PMCID: PMC6914670 DOI: 10.1038/s41385-019-0225-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 10/14/2019] [Accepted: 10/21/2019] [Indexed: 02/04/2023]
Abstract
Uropathogenic Escherichia coli (UPEC) is the leading cause of urinary tract infections (UTIs), inducing acute pyelonephritis and may result in permanent renal scarring and failure. Alpha-hemolysin (HlyA), a key UPEC toxin, causes serious tissue damage; however, the mechanism through which HlyA induces kidney injury remains unclear. In the present study, granulocyte-macrophage colony-stimulating factor (GM-CSF) secreted by renal epithelial cells was upregulated by HlyA in vitro and in vivo, which induced M1 macrophage accumulation in kidney, and ADAM10 was found involved in HlyA-induced GM-CSF. Macrophage elimination or GM-CSF neutralization protected against acute kidney injury in mice, and increased GM-CSF was detected in urine of patients infected by hlyA-positive UPEC. In addition, HlyA was found to promote UPEC invasion into renal epithelial cells by interacting with Nectin-2 in vitro. However, HlyA did not affect bacterial titers during acute kidney infections, and HlyA-induced invasion did not contribute to GM-CSF upregulation in vitro, which indicate that HlyA-induced GM-CSF is independent of bacteria invasion. The role of GM-CSF in HlyA-mediated kidney injury may lead to novel strategies to treat acute pyelonephritis.
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Affiliation(s)
- Changying Wang
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Qianqian Li
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Junqiang Lv
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Xuan Sun
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Yang Cao
- 0000 0004 1798 6160grid.412648.dDepartment of Clinical Laboratory, The Second Hospital of Tianjin Medical University, 300211 Tianjin, China
| | - Kaiyuan Yu
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Chunhui Miao
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Zhi-Song Zhang
- 0000 0000 9878 7032grid.216938.7State Key Laboratory of Medicinal Chemical Biology and College of Pharmacy, Collaborative Innovation Center for Biotherapy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, 300350 Tianjin, China
| | - Zhi Yao
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China ,0000 0000 9792 1228grid.265021.22011 Collaborative Innovation Center of Tianjin for Medical Epigenetics, Tianjin Medical University, 300070 Tianjin, China
| | - Quan Wang
- 0000 0000 9792 1228grid.265021.2Department of Immunology, Key Laboratory of Immune Microenvironment and Disease of the Educational Ministry of China, Tianjin Key Laboratory of Cellular and Molecular Immunology, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
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Bioinformatic Analysis of Transcriptomic Data Reveals Novel Key Genes Regulating Osteogenic Differentiation of Human Adipose Stem Cells. Stem Cells Int 2019; 2019:1705629. [PMID: 31467558 PMCID: PMC6701308 DOI: 10.1155/2019/1705629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 05/02/2019] [Accepted: 05/21/2019] [Indexed: 12/22/2022] Open
Abstract
Adipose stem cells (ASCs) are an attractive cell source for treating many human diseases including osteoporosis. However, the molecular mechanisms accounting for ASC osteogenesis are poorly known. In this study, ASCs were first isolated from the fat tissues from the patients with osteoporosis. The global transcriptome profile between osteogenic differentiated ASCs and undifferentiated ASCs was compared using RNA sequencing (RNA-seq). Then, bioinformatic analysis was performed to reveal the central genes and pathways that regulated the osteogenic differentiation of ASCs. One of the interested genes C5AR1 was chosen for further investigation. A total of 1521 upregulated and 3020 downregulated genes were identified between the ASCs with osteogenic induction and controls. Functional gene ontology analysis revealed that these significantly differentially expressed genes (DEGs) were associated with cell cycle, protein binding, and nucleotide binding. Pathway analysis showed that many canonical pathways, such as the MAPK signaling pathway and the PI3K-AKT pathway, might actively be involved in regulating osteogenic differentiation of ASCs. A total of three subnetworks and 20 central nodes were identified by the protein-protein interaction analysis. In addition, the expression level of C5AR1 was significantly increased during osteogenic differentiation of ASCs. The downregulation of C5AR1 dramatically reduced the expression levels of osteogenic differentiation biomarkers and calcium nodule formation capacity. Collectively, we have provided a number of novel genes and pathways that might be indispensable for ASC osteogenic differentiation. Manipulating the levels of this candidate gene might contribute to the osteoporosis therapy.
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Wu KY, Zhang T, Zhao GX, Ma N, Zhao SJ, Wang N, Wang JX, Li ZF, Zhou W, Li K. The C3a/C3aR axis mediates anti-inflammatory activity and protects against uropathogenic E coli-induced kidney injury in mice. Kidney Int 2019; 96:612-627. [PMID: 31133456 DOI: 10.1016/j.kint.2019.03.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 02/26/2019] [Accepted: 03/07/2019] [Indexed: 11/18/2022]
Abstract
Both the C3a/C3aR and C5a/C5aR1 axes are regarded as important pathways for inducing and regulating inflammatory responses. It is well documented that the C5a/C5aR1 axis is a potent inflammatory mediator in the pathogenesis of many clinic disorders. However, our understanding of the role of the C3a/C3aR axis in renal disorders remains limited. Contrary to the C5a/C5aR axis, we now show that the C3a/C3aR axis has a protective role in uropathogenic Escherichia coli (UPEC)-induced renal injury. C3aR-/- mice were found to develop severe renal pathology compared to wild type mice, a pathology characterized by intense tissue damage and an increased bacterial load within the kidney. This was associated with an overwhelming production of pro-inflammatory mediators and increased neutrophil infiltration in the kidney. Bone marrow chimera experiments found that tissue damage and bacterial load were significantly reduced in C3aR-/- mice that received bone marrow from wild type mice, compared with that in mice re-populated with bone marrow from C3aR-/- mice. This supports a critical role for C3aR on myeloid cells in the pathological process. Pharmacological treatment of mice with a C3aR agonist reduced both the extent of tissue injury and bacterial load. Mechanistic analyses indicated that the C3a/C3aR axis downregulates the lipopolysaccharide-induced pro-inflammatory responses in macrophages and facilitates the phagocytosis of UPEC by phagocytes. Thus, our findings clearly demonstrate a protective role of the C3a/C3aR axis in UPEC-induced renal injury, conferred by the suppression of pro-inflammatory responses and enhanced phagocytosis by macrophages.
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Affiliation(s)
- Kun-Yi Wu
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Ting Zhang
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Guo-Xiu Zhao
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Ning Ma
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Shu-Juan Zhao
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Na Wang
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Jia-Xing Wang
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Zong-Fang Li
- National Local Joint Engineering Research Centre of Biodiagnostics and Biotherapy, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Wuding Zhou
- Medical Research Council (MRC) Centre for Transplantation, King's College London, Guy's Hospital, UK.
| | - Ke Li
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China; National Local Joint Engineering Research Centre of Biodiagnostics and Biotherapy, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China.
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Song Y, Wu KY, Wu W, Duan ZY, Gao YF, Zhang LD, Chong T, Garstka MA, Zhou W, Li K. Epithelial C5aR1 Signaling Enhances Uropathogenic Escherichia coli Adhesion to Human Renal Tubular Epithelial Cells. Front Immunol 2018; 9:949. [PMID: 29765378 PMCID: PMC5938350 DOI: 10.3389/fimmu.2018.00949] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 04/17/2018] [Indexed: 12/22/2022] Open
Abstract
Recent work in a murine model of ascending urinary tract infection has suggested that C5a/C5aR1 interactions play a pathogenic role in the development of renal infection through enhancement of bacterial adhesion/colonization to renal tubular epithelial cells (RTECs). In the present study, we extended these observations to human. We show that renal tubular epithelial C5aR1 signaling is involved in promoting uropathogenic Escherichia coli (UPEC) adhesion/invasion of host cells. Stimulation of primary cultures of RTEC with C5a resulted in significant increases in UPEC adhesion/invasion of the RTEC. This was associated with enhanced expression of terminal α-mannosyl residues (Man) (a ligand for type 1 fimbriae of E. coli) in the RTEC following C5a stimulation. Mechanism studies revealed that C5aR1-mediated activation of ERK1/2/NF-κB and upregulation of proinflammatory cytokine production (i.e., TNF-α) is at least partly responsible for the upregulation of Man expression and bacterial adhesion. Clinical sample studies showed that C5aR1 and Man were clearly detected in the renal tubular epithelium of normal human kidney biopsies, and UPEC bound to the epithelium in a d-mannose-dependent manner. Additionally, C5a levels were significantly increased in urine of urinary tract infection patients compared with healthy controls. Our data therefore demonstrate that, in agreement with observations in mice, human renal tubular epithelial C5aR1 signaling can upregulate Man expression in RTEC, which enhances UPEC adhesion to and invasion of RTEC. It also suggests the in vivo relevance of upregulation of Man expression in renal tubular epithelium by C5a/C5aR1 interactions and its potential impact on renal infection.
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Affiliation(s)
- Yun Song
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Kun-Yi Wu
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Weiju Wu
- Medical Research Council (MRC) Centre for Transplantation, King's College London, Guy's Hospital, London, United Kingdom
| | - Zhao-Yang Duan
- Department of Nephrology, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Ya-Feng Gao
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Liang-Dong Zhang
- Department of Urology, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Tie Chong
- Department of Urology, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Malgorzata A Garstka
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Wuding Zhou
- Medical Research Council (MRC) Centre for Transplantation, King's College London, Guy's Hospital, London, United Kingdom
| | - Ke Li
- Core Research Laboratory, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
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