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Lin DW, Yang TM, Ho C, Shih YH, Lin CL, Hsu YC. Targeting Macrophages: Therapeutic Approaches in Diabetic Kidney Disease. Int J Mol Sci 2024; 25:4350. [PMID: 38673935 PMCID: PMC11050450 DOI: 10.3390/ijms25084350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Revised: 04/10/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024] Open
Abstract
Diabetes is not solely a metabolic disorder but also involves inflammatory processes. The immune response it incites is a primary contributor to damage in target organs. Research indicates that during the initial phases of diabetic nephropathy, macrophages infiltrate the kidneys alongside lymphocytes, initiating a cascade of inflammatory reactions. The interplay between macrophages and other renal cells is pivotal in the advancement of kidney disease within a hyperglycemic milieu. While M1 macrophages react to the inflammatory stimuli induced by elevated glucose levels early in the disease progression, their subsequent transition to M2 macrophages, which possess anti-inflammatory and tissue repair properties, also contributes to fibrosis in the later stages of nephropathy by transforming into myofibroblasts. Comprehending the diverse functions of macrophages in diabetic kidney disease and regulating their activity could offer therapeutic benefits for managing this condition.
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Affiliation(s)
- Da-Wei Lin
- Department of Internal Medicine, St. Martin De Porres Hospital, Chiayi City 60069, Taiwan;
| | - Tsung-Ming Yang
- Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
- School of Traditional Chinese Medicine, College of Medicine, Chang Gung University, Taoyuan 33303, Taiwan;
| | - Cheng Ho
- Division of Endocrinology and Metabolism, Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
| | - Ya-Hsueh Shih
- Departments of Nephrology, Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
- Kidney and Diabetic Complications Research Team (KDCRT), Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
| | - Chun-Liang Lin
- School of Traditional Chinese Medicine, College of Medicine, Chang Gung University, Taoyuan 33303, Taiwan;
- Departments of Nephrology, Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
- Kidney and Diabetic Complications Research Team (KDCRT), Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
- Kidney Research Center, Chang Gung Memorial Hospital, Taipei 10507, Taiwan
- Center for Shockwave Medicine and Tissue Engineering, Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan
| | - Yung-Chien Hsu
- Departments of Nephrology, Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
- Kidney and Diabetic Complications Research Team (KDCRT), Chang Gung Memorial Hospital, Chiayi County 61363, Taiwan
- School of Medicine, College of Medicine, Chang Gung University, Taoyuan 33303, Taiwan
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Zhao Y, Peng F, He J, Qu Y, Ni H, Wu L, Chen X. SOCS1 Peptidomimetic Alleviates Glomerular Inflammation in MsPGN by Inhibiting Macrophage M1 Polarization. Inflammation 2023; 46:2402-2414. [PMID: 37581761 DOI: 10.1007/s10753-023-01886-3] [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: 05/10/2023] [Revised: 07/04/2023] [Accepted: 08/01/2023] [Indexed: 08/16/2023]
Abstract
Mesangial proliferative glomerulonephritis (MsPGN), the most common pathological change in primary glomerulonephritis, is characterized by increased macrophage infiltration into glomeruli, which results in proinflammatory cytokine release. Macrophage infiltration and differentiation are induced by the Janus kinase 2 and signal transducer and activator of the transcription 1 (JAK2/STAT1) pathway. As a suppressor of cytokine signaling 1 (SOCS1) downregulates the immune response by inhibiting the JAK2/STAT1 pathway, we investigated whether a peptide mimicking the SOCS1 kinase inhibitor region, namely, SOCS1 peptidomimetic, protects against nephropathy. Glomerular JAK2/STAT1 pathway activation was synchronized with kidney injury in an MsPGN rat model. Rats treated with the SOCS1 peptidomimetic exhibited reduced pathological glomerular changes and lessened macrophage recruitment. Moreover, in vivo, the phosphorylation of the JAK2/STAT1 pathway was downregulated in infiltrated macrophages of glomeruli. In vitro, the SOCS1 peptidomimetic inhibited macrophage M1 polarization by suppressing JAK2/STAT1 activation. In conclusion, our study demonstrated that the SOCS1 peptidomimetic plays a protective role against pathologic glomerular changes in MsPGN by reducing macrophage infiltration and inhibiting macrophage polarizing to the M1 phenotype. SOCS1 peptidomimetic, therefore, presents a feasible therapeutic strategy to alleviate renal inflammation in MsPGN.
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Affiliation(s)
- Yinghua Zhao
- Department of Nephrology, First Medical Center of Chinese, State Key Laboratory of Kidney Diseases, PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, 100853, China
- School of Clinical Medicine, Beijing Tsinghua Changgung Hospital, Tsinghua University, Beijing, China
| | - Fei Peng
- Department of Nephrology, First Medical Center of Chinese, State Key Laboratory of Kidney Diseases, PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, 100853, China
- School of Medicine, Nankai University, Tianjin, China
| | - Jiayi He
- Department of Nephrology, First Medical Center of Chinese, State Key Laboratory of Kidney Diseases, PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, 100853, China
| | - Yilun Qu
- Department of Nephrology, First Medical Center of Chinese, State Key Laboratory of Kidney Diseases, PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, 100853, China
| | - Huiming Ni
- Department of Nephrology, First Medical Center of Chinese, State Key Laboratory of Kidney Diseases, PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, 100853, China
| | - Lingling Wu
- Department of Nephrology, First Medical Center of Chinese, State Key Laboratory of Kidney Diseases, PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, 100853, China
| | - Xiangmei Chen
- Department of Nephrology, First Medical Center of Chinese, State Key Laboratory of Kidney Diseases, PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, 100853, China.
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Boi R, Ebefors K, Nyström J. The role of the mesangium in glomerular function. Acta Physiol (Oxf) 2023; 239:e14045. [PMID: 37658606 DOI: 10.1111/apha.14045] [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: 05/30/2023] [Revised: 07/12/2023] [Accepted: 08/01/2023] [Indexed: 09/03/2023]
Abstract
When discussing glomerular function, one cell type is often left out, the mesangial cell (MC), probably since it is not a part of the filtration barrier per se. The MCs are instead found between the glomerular capillaries, embedded in their mesangial matrix. They are in direct contact with the endothelial cells and in close contact with the podocytes and together they form the glomerulus. The MCs can produce and react to a multitude of growth factors, cytokines, and other signaling molecules and are in the perfect position to be a central hub for crosstalk communication between the cells in the glomerulus. In certain glomerular diseases, for example, in diabetic kidney disease or IgA nephropathy, the MCs become activated resulting in mesangial expansion. The expansion is normally due to matrix expansion in combination with either proliferation or hypertrophy. With time, this expansion can lead to fibrosis and decreased glomerular function. In addition, signs of complement activation are often seen in biopsies from patients with glomerular disease affecting the mesangium. This review aims to give a better understanding of the MCs in health and disease and their role in glomerular crosstalk and inflammation.
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Affiliation(s)
- Roberto Boi
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Kerstin Ebefors
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Jenny Nyström
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Yao W, Chen Y, Li Z, Ji J, You A, Jin S, Ma Y, Zhao Y, Wang J, Qu L, Wang H, Xiang C, Wang S, Liu G, Bai F, Yang L. Single Cell RNA Sequencing Identifies a Unique Inflammatory Macrophage Subset as a Druggable Target for Alleviating Acute Kidney Injury. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103675. [PMID: 35112806 PMCID: PMC9036000 DOI: 10.1002/advs.202103675] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 12/11/2021] [Indexed: 05/08/2023]
Abstract
Acute kidney injury (AKI) is a complex clinical disorder associated with poor outcomes. Targeted regulation of the degree of inflammation has been a potential strategy for AKI management. Macrophages are the main effector cells of kidney inflammation. However, macrophage heterogeneity in ischemia reperfusion injury induced AKI (IRI-AKI) remains unclear. Using single-cell RNA sequencing of the mononuclear phagocytic system in the murine IRI model, the authors demonstrate the complementary roles of kidney resident macrophages (KRMs) and monocyte-derived infiltrated macrophages (IMs) in modulating tissue inflammation and promoting tissue repair. A unique population of S100a9hi Ly6chi IMs is identified as an early responder to AKI, mediating the initiation and amplification of kidney inflammation. Kidney infiltration of S100A8/A9+ macrophages and the relevance of renal S100A8/A9 to tissue injury is confirmed in human AKI. Targeting the S100a8/a9 signaling with small-molecule inhibitors exhibits renal protective effects represented by improved renal function and reduced mortality in bilateral IRI model, and decreased inflammatory response, ameliorated kidney injury, and improved long-term outcome with decreased renal fibrosis in the unilateral IRI model. The findings support S100A8/A9 blockade as a feasible and clinically relevant therapy potentially waiting for translation in human AKI.
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Affiliation(s)
- Weijian Yao
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Ying Chen
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Zehua Li
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Jing Ji
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Abin You
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Shanzhao Jin
- Biomedical Pioneering Innovation Center (BIOPIC)Beijing Advanced Innovation Center for Genomics (ICG)School of Life SciencesPeking UniversityBeijing100871China
| | - Yuan Ma
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Youlu Zhao
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Jinwei Wang
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Lei Qu
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Hui Wang
- Laboratory of Electron MicroscopyPathological CenterPeking University First HospitalBeijing100034China
| | - Chengang Xiang
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Suxia Wang
- Laboratory of Electron MicroscopyPathological CenterPeking University First HospitalBeijing100034China
| | - Gang Liu
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
| | - Fan Bai
- Biomedical Pioneering Innovation Center (BIOPIC)Beijing Advanced Innovation Center for Genomics (ICG)School of Life SciencesPeking UniversityBeijing100871China
| | - Li Yang
- Renal DivisionPeking University Institute of NephrologyKey Laboratory of Renal Disease‐Ministry of Health of ChinaKey Laboratory of CKD Prevention and Treatment (Peking University)‐Ministry of Education of ChinaResearch Units of Diagnosis and Treatment of Immune‐mediated Kidney Diseases‐Chinese Academy of Medical SciencesPeking University First HospitalXishiku Street #8Beijing100034China
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Hata Y, Date R, Fujimoto D, Ikeda HO, Umemoto S, Kanki T, Nishiguchi Y, Mizumoto T, Hayata M, Kakizoe Y, Izumi Y, Kakizuka A, Mukoyama M, Kuwabara T. A Novel VCP modulator KUS121 exerts renoprotective effects in ischemia-reperfusion injury with retaining ATP and restoring ERAD-processing capacity. Am J Physiol Renal Physiol 2022; 322:F577-F586. [PMID: 35343850 DOI: 10.1152/ajprenal.00392.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Acute kidney injury (AKI) is a life-threatening condition and often progresses to chronic kidney disease or may develop other organ dysfunction even after recovery. Despite the increased recognition and high prevalence of AKI worldwide, there has been no established treatment so far. The aim of this study is to investigate the renoprotective effect of KUS121, a novel valosin-containing protein (VCP) modulator, on AKI. METHODS In in vitro experiment, we evaluated cell viability and ATP levels of proximal tubular cells (PTs) with or without KUS121 under ER-stress condition. In in vivo experiment, the effects of KUS121 were examined in mice with AKI caused by ischemia-reperfusion (I/R) injury. ER-associated degradation (ERAD)-processing capacity was evaluated by quantification of ERAD substrate CD3delta-YFP. RESULTS KUS121 protected PTs from cell death under ER stress. Apoptotic response was mitigated as indicated by the suppression of CHOP expression and caspase-3 cleavage, with maintained intracellular ATP levels by KUS121 administration. KUS121 treatment suppressed the elevation of serum creatinine and NGAL levels and attenuated renal tubular damages after I/R. The expression of inflammatory cytokines in the kidney was also suppressed in the KUS121-treated group. VCP expression levels were not altered by KUS121 both in vitro and in vivo. KUS121 treatment restored ERAD-processing capacity associated with potentiation of its upstream pathway, phosphorylated IRE1a and spliced XBP1. CONCLUSIONS These findings indicate that KUS 121 can protect renal tubular cells from ER stress-induced injury, suggesting that KUS121 could be a novel and promising therapeutic compound for ischemia-associated AKI.
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Affiliation(s)
- Yusuke Hata
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Ryosuke Date
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Daisuke Fujimoto
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Hanako Ohashi Ikeda
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Shuro Umemoto
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Tomoko Kanki
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Yoshihiko Nishiguchi
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Teruhiko Mizumoto
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Manabu Hayata
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Yutaka Kakizoe
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Yuichiro Izumi
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Akira Kakizuka
- Laboratory of Functional Biology, Kyoto University Graduate School of Biostudies, Kyoto, Japan
| | - Masashi Mukoyama
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Takashige Kuwabara
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
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Utilizing methylglyoxal and D-lactate in urine to evaluate saikosaponin C treatment in mice with accelerated nephrotoxic serum nephritis. PLoS One 2020; 15:e0241053. [PMID: 33104740 PMCID: PMC7588094 DOI: 10.1371/journal.pone.0241053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 10/07/2020] [Indexed: 11/19/2022] Open
Abstract
The relationship between methylglyoxal (MGO) and D-lactate during saikosaponin C (SSC) treatment of mice with accelerated nephrotoxic serum (NTS) nephritis was investigated. NTS nephritis was induced by administration of anti-basement membrane antibodies to C57BL/6 mice and three dosages of SSC were administered for 14 days. Proteinuria, blood urea nitrogen, serum creatinine, renal histology, urinary MGO and d-lactate changes were examined. Compared to the NTS control group, the middle dosage (10 mg/kg/day) of SSC significantly alleviated the development of nephritis based on urine protein measurements (34.40 ± 6.85 vs. 17.33 ± 4.79 mg/day, p<0.05). Pathological observation of the glomerular basement membrane (GBM) revealed monocyte infiltration, hypertrophy, and crescents were alleviated, and injury scoring also showed improved efficacy for the middle dose of SSC during nephritis (7.92 ± 1.37 vs. 3.50 ± 1.14, p<0.05). Moreover, the significant decreases in urinary levels of MGO (24.71 ± 3.46 vs. 16.72 ± 2.36 μg/mg, p<0.05) and D-lactate (0.31 ± 0.04 vs. 0.23 ± 0.02 μmol/mg, p<0.05) were consistent with the biochemical and pathological examinations. This study demonstrates that MGO and D-lactate may reflect the extent of damage and the efficacy of SSC in NTS nephritis; further studies are required to enable clinical application.
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Fujimoto D, Kuwabara T, Hata Y, Umemoto S, Kanki T, Nishiguchi Y, Mizumoto T, Hayata M, Kakizoe Y, Izumi Y, Takahashi S, Mukoyama M. Suppressed ER-associated degradation by intraglomerular cross talk between mesangial cells and podocytes causes podocyte injury in diabetic kidney disease. FASEB J 2020; 34:15577-15590. [PMID: 32996639 DOI: 10.1096/fj.202000078rr] [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] [Received: 01/10/2020] [Revised: 09/14/2020] [Accepted: 09/21/2020] [Indexed: 12/21/2022]
Abstract
Mesangial lesions and podocyte injury are essential manifestations of the progression of diabetic kidney disease (DKD). Although cross-communication between mesangial cells (MCs) and podocytes has recently been suggested by the results of single-nucleus RNA sequencing analyses, the molecular mechanisms and role in disease progression remain elusive. Our cDNA microarray data of diabetic mouse glomeruli suggested the involvement of endoplasmic reticulum (ER) stress in DKD pathophysiology. In vitro experiments revealed the suppression of the ER-associated degradation (ERAD) pathway and induction of apoptosis in podocytes that were stimulated with the supernatant of MCs cultured in high glucose conditions. In diabetic mice, ERAD inhibition resulted in exacerbated albuminuria, increased apoptosis in podocytes, and reduced nephrin expression associated with the downregulation of ERAD-related biomolecules. Flow cytometry analysis of podocytes isolated from MafB (a transcription factor known to be expressed in macrophages and podocytes)-GFP knock-in mice revealed that ERAD inhibition resulted in decreased nephrin phosphorylation. These findings suggest that an intraglomerular cross talk between MCs and podocytes can inhibit physiological ERAD processes and suppress the phosphorylation of nephrin in podocytes, which thereby lead to podocyte injury under diabetic conditions. Therapeutic intervention of the ERAD pathway through the cross talk between these cells is potentially a novel strategy for DKD.
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Affiliation(s)
- Daisuke Fujimoto
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Takashige Kuwabara
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Yusuke Hata
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Shuro Umemoto
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Tomoko Kanki
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Yoshihiko Nishiguchi
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Teruhiko Mizumoto
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Manabu Hayata
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Yutaka Kakizoe
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Yuichiro Izumi
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
| | - Satoru Takahashi
- Department of Anatomy and Embryology, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Masashi Mukoyama
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
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