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Randle RK, Amara VR, Popik W. IFI16 Is Indispensable for Promoting HIF-1α-Mediated APOL1 Expression in Human Podocytes under Hypoxic Conditions. Int J Mol Sci 2024; 25:3324. [PMID: 38542298 PMCID: PMC10970439 DOI: 10.3390/ijms25063324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 02/28/2024] [Accepted: 03/13/2024] [Indexed: 04/04/2024] Open
Abstract
Genetic variants in the protein-coding regions of APOL1 are associated with an increased risk and progression of chronic kidney disease (CKD) in African Americans. Hypoxia exacerbates CKD progression by stabilizing HIF-1α, which induces APOL1 transcription in kidney podocytes. However, the contribution of additional mediators to regulating APOL1 expression under hypoxia in podocytes is unknown. Here, we report that a transient accumulation of HIF-1α in hypoxia is sufficient to upregulate APOL1 expression in podocytes through a cGAS/STING/IRF3-independent pathway. Notably, IFI16 ablation impedes hypoxia-driven APOL1 expression despite the nuclear accumulation of HIF-1α. Co-immunoprecipitation assays indicate no direct interaction between IFI16 and HIF-1α. Our studies identify hypoxia response elements (HREs) in the APOL1 gene enhancer/promoter region, showing increased HIF-1α binding to HREs located in the APOL1 gene enhancer. Luciferase reporter assays confirm the role of these HREs in transcriptional activation. Chromatin immunoprecipitation (ChIP)-qPCR assays demonstrate that IFI16 is not recruited to HREs, and IFI16 deletion reduces HIF-1α binding to APOL1 HREs. RT-qPCR analysis indicates that IFI16 selectively affects APOL1 expression, with a negligible impact on other hypoxia-responsive genes in podocytes. These findings highlight the unique contribution of IFI16 to hypoxia-driven APOL1 gene expression and suggest alternative IFI16-dependent mechanisms regulating APOL1 gene expression under hypoxic conditions.
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Affiliation(s)
- Richaundra K. Randle
- Department of Biomedical Sciences, School of Graduate Studies, Meharry Medical College, Nashville, TN 37208, USA;
- Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, TN 37208, USA;
| | - Venkateswara Rao Amara
- Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, TN 37208, USA;
- Department of Regulatory Toxicology, National Institute of Pharmaceutical Education and Research, Hajipur 844102, Bihar, India
| | - Waldemar Popik
- Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, TN 37208, USA;
- Department of Internal Medicine, School of Medicine, Meharry Medical College, Nashville, TN 37208, USA
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2
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Gupta N, Waas B, Austin D, De Mazière AM, Kujala P, Stockwell AD, Li T, Yaspan BL, Klumperman J, Scales SJ. Apolipoprotein L1 (APOL1) renal risk variant-mediated podocyte cytotoxicity depends on African haplotype and surface expression. Sci Rep 2024; 14:3765. [PMID: 38355600 PMCID: PMC10866943 DOI: 10.1038/s41598-024-53298-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 01/30/2024] [Indexed: 02/16/2024] Open
Abstract
Homozygous Apolipoprotein L1 (APOL1) variants G1 and G2 cause APOL1-mediated kidney disease, purportedly acting as surface cation channels in podocytes. APOL1-G0 exhibits various single nucleotide polymorphisms, most commonly haplotype E150K, M228I and R255K ("KIK"; the Reference Sequence is "EMR"), whereas variants G1 and G2 are mostly found in a single "African" haplotype background ("EIK"). Several labs reported cytotoxicity with risk variants G1 and G2 in KIK or EIK background haplotypes, but used HEK-293 cells and did not verify equal surface expression. To see if haplotype matters in a more relevant cell type, we induced APOL1-G0, G1 and G2 EIK, KIK and EMR at comparable surface levels in immortalized podocytes. G1 and G2 risk variants (but not G0) caused dose-dependent podocyte death within 48h only in their native African EIK haplotype and correlated with K+ conductance (thallium FLIPR). We ruled out differences in localization and trafficking, except for possibly greater surface clustering of cytotoxic haplotypes. APOL1 surface expression was required, since Brefeldin A rescued cytotoxicity; and cytoplasmic isoforms vB3 and vC were not cytotoxic. Thus, APOL1-EIK risk variants kill podocytes in a dose and haplotype-dependent manner (as in HEK-293 cells), whereas unlike in HEK-293 cells the KIK risk variants did not.
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Affiliation(s)
- Nidhi Gupta
- Department of Discovery Immunology, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA
- Department of Molecular Biology, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Bridget Waas
- Department of Discovery Immunology, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Daniel Austin
- Department of Biochemical and Cellular Pharmacology, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Ann M De Mazière
- Section of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Pekka Kujala
- Section of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Amy D Stockwell
- Department of Human Genetics, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Tianbo Li
- Department of Biochemical and Cellular Pharmacology, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Brian L Yaspan
- Department of Human Genetics, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA.
| | - Judith Klumperman
- Section of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Suzie J Scales
- Department of Discovery Immunology, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA.
- Department of Molecular Biology, Genentech, 1 DNA Way, South San Francisco, CA, 94080, USA.
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3
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Paz-Barba M, Muñoz Garcia A, de Winter TJJ, de Graaf N, van Agen M, van der Sar E, Lambregtse F, Daleman L, van der Slik A, Zaldumbide A, de Koning EJP, Carlotti F. Apolipoprotein L genes are novel mediators of inflammation in beta cells. Diabetologia 2024; 67:124-136. [PMID: 37924378 PMCID: PMC10709252 DOI: 10.1007/s00125-023-06033-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 08/22/2023] [Indexed: 11/06/2023]
Abstract
AIMS/HYPOTHESIS Inflammation induces beta cell dysfunction and demise but underlying molecular mechanisms remain unclear. The apolipoprotein L (APOL) family of genes has been associated with innate immunity and apoptosis in non-pancreatic cell types, but also with metabolic syndrome and type 2 diabetes mellitus. Here, we hypothesised that APOL genes play a role in inflammation-induced beta cell damage. METHODS We used single-cell transcriptomics datasets of primary human pancreatic islet cells to study the expression of APOL genes upon specific stress conditions. Validation of the findings was carried out in EndoC-βH1 cells and primary human islets. Finally, we performed loss- and gain-of-function experiments to investigate the role of APOL genes in beta cells. RESULTS APOL genes are expressed in primary human beta cells and APOL1, 2 and 6 are strongly upregulated upon inflammation via the Janus kinase (JAK)-signal transducer and activator of transcription (STAT) pathway. APOL1 overexpression increases endoplasmic reticulum stress while APOL1 knockdown prevents cytokine-induced beta cell death and interferon-associated response. Furthermore, we found that APOL genes are upregulated in beta cells from donors with type 2 diabetes compared with donors without diabetes mellitus. CONCLUSIONS/INTERPRETATION APOLs are novel regulators of islet inflammation and may contribute to beta cell damage during the development of diabetes. DATA AVAILABILITY scRNAseq data generated by our laboratory and used in this study are available in the Gene Expression Omnibus (GEO; www.ncbi.nlm.nih.gov/geo/ ), accession number GSE218316.
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Affiliation(s)
- Miriam Paz-Barba
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Amadeo Muñoz Garcia
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Twan J J de Winter
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Natascha de Graaf
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Maarten van Agen
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Elisa van der Sar
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Ferdy Lambregtse
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Lizanne Daleman
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Arno van der Slik
- Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, the Netherlands
| | - Arnaud Zaldumbide
- Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, the Netherlands
| | - Eelco J P de Koning
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Françoise Carlotti
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands.
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4
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Zhu JY, Lee JG, Fu Y, van de Leemput J, Ray PE, Han Z. APOL1-G2 accelerates nephrocyte cell death by inhibiting the autophagy pathway. Dis Model Mech 2023; 16:dmm050223. [PMID: 37969018 PMCID: PMC10765414 DOI: 10.1242/dmm.050223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 10/30/2023] [Indexed: 11/17/2023] Open
Abstract
People of African ancestry who carry the APOL1 risk alleles G1 or G2 are at high risk of developing kidney diseases through not fully understood mechanisms that impair the function of podocytes. It is also not clear whether the APOL1-G1 and APOL1-G2 risk alleles affect these cells through similar mechanisms. Previously, we have developed transgenic Drosophila melanogaster lines expressing either the human APOL1 reference allele (G0) or APOL1-G1 specifically in nephrocytes, the cells homologous to mammalian podocytes. We have found that nephrocytes that expressed the APOL1-G1 risk allele display accelerated cell death, in a manner similar to that of cultured human podocytes and APOL1 transgenic mouse models. Here, to compare how the APOL1-G1 and APOL1-G2 risk alleles affect the structure and function of nephrocytes in vivo, we generated nephrocyte-specific transgenic flies that either expressed the APOL1-G2 or both G1 and G2 (G1G2) risk alleles on the same allele. We found that APOL1-G2- and APOL1-G1G2-expressing nephrocytes developed more severe changes in autophagic pathways, acidification of organelles and the structure of the slit diaphragm, compared to G1-expressing nephrocytes, leading to their premature death. We conclude that both risk alleles affect similar key cell trafficking pathways, leading to reduced autophagy and suggesting new therapeutic targets to prevent APOL1 kidney diseases.
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Affiliation(s)
- Jun-yi Zhu
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Jin-Gu Lee
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Yulong Fu
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Joyce van de Leemput
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Patricio E. Ray
- Department of Pediatrics, Child Health Research Center, University of Virginia, Charlottesville, VA 22903, USA
| | - Zhe Han
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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5
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Wu S, Fan Z, Kim P, Huang L, Zhou X. The Integrative Studies on the Functional A-to-I RNA Editing Events in Human Cancers. Genomics Proteomics Bioinformatics 2023; 21:619-631. [PMID: 36708807 PMCID: PMC10787018 DOI: 10.1016/j.gpb.2022.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 11/04/2022] [Accepted: 12/28/2022] [Indexed: 01/26/2023]
Abstract
Adenosine-to-inosine (A-to-I) RNA editing, constituting nearly 90% of all RNA editing events in humans, has been reported to contribute to the tumorigenesis in diverse cancers. However, the comprehensive map for functional A-to-I RNA editing events in cancers is still insufficient. To fill this gap, we systematically and intensively analyzed multiple tumorigenic mechanisms of A-to-I RNA editing events in samples across 33 cancer types from The Cancer Genome Atlas. For individual candidate among ∼ 1,500,000 quantified RNA editing events, we performed diverse types of downstream functional annotations. Finally, we identified 24,236 potentially functional A-to-I RNA editing events, including the cases in APOL1, IGFBP3, GRIA2, BLCAP, and miR-589-3p. These events might play crucial roles in the scenarios of tumorigenesis, due to their tumor-related editing frequencies or probable effects on altered expression profiles, protein functions, splicing patterns, and microRNA regulations of tumor genes. Our functional A-to-I RNA editing events (https://ccsm.uth.edu/CAeditome/) will help better understand the cancer pathology from the A-to-I RNA editing aspect.
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Affiliation(s)
- Sijia Wu
- School of Life Science and Technology, Xidian University, Xi'an 710071, China
| | - Zhiwei Fan
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610040, China; Center for Computational Systems Medicine, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Pora Kim
- Center for Computational Systems Medicine, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA.
| | - Liyu Huang
- School of Life Science and Technology, Xidian University, Xi'an 710071, China.
| | - Xiaobo Zhou
- Center for Computational Systems Medicine, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA.
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6
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Andrews M, Yoshida T, Henderson CM, Pflaum H, McGregor A, Lieberman JA, de Boer IH, Vaisar T, Himmelfarb J, Kestenbaum B, Chung JY, Hewitt SM, Santo BA, Ginley B, Sarder P, Rosenberg AZ, Murakami T, Kopp JB, Kuklenyik Z, Hoofnagle AN. Variant APOL1 protein in plasma associates with larger particles in humans and mouse models of kidney injury. PLoS One 2022; 17:e0276649. [PMID: 36279295 PMCID: PMC9591058 DOI: 10.1371/journal.pone.0276649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 10/11/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Genetic variants in apolipoprotein L1 (APOL1), a protein that protects humans from infection with African trypanosomes, explain a substantial proportion of the excess risk of chronic kidney disease affecting individuals with sub-Saharan ancestry. The mechanisms by which risk variants damage kidney cells remain incompletely understood. In preclinical models, APOL1 expressed in podocytes can lead to significant kidney injury. In humans, studies in kidney transplant suggest that the effects of APOL1 variants are predominantly driven by donor genotype. Less attention has been paid to a possible role for circulating APOL1 in kidney injury. METHODS Using liquid chromatography-tandem mass spectrometry, the concentrations of APOL1 were measured in plasma and urine from participants in the Seattle Kidney Study. Asymmetric flow field-flow fractionation was used to evaluate the size of APOL1-containing lipoprotein particles in plasma. Transgenic mice that express wild-type or risk variant APOL1 from an albumin promoter were treated to cause kidney injury and evaluated for renal disease and pathology. RESULTS In human participants, urine concentrations of APOL1 were correlated with plasma concentrations and reduced kidney function. Risk variant APOL1 was enriched in larger particles. In mice, circulating risk variant APOL1-G1 promoted kidney damage and reduced podocyte density without renal expression of APOL1. CONCLUSIONS These results suggest that plasma APOL1 is dynamic and contributes to the progression of kidney disease in humans, which may have implications for treatment of APOL1-associated kidney disease and for kidney transplantation.
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Affiliation(s)
- Michael Andrews
- Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Teruhiko Yoshida
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Clark M. Henderson
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Hannah Pflaum
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Ayako McGregor
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Joshua A. Lieberman
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Ian H. de Boer
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
| | - Tomas Vaisar
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Jonathan Himmelfarb
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
| | - Bryan Kestenbaum
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
| | - Joon-Yong Chung
- Center for Cancer Research, NCI, NIH, Bethesda, Maryland, United States of America
| | - Stephen M. Hewitt
- Center for Cancer Research, NCI, NIH, Bethesda, Maryland, United States of America
| | - Briana A. Santo
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, New York, United States of America
| | - Brandon Ginley
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, New York, United States of America
| | - Pinaki Sarder
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, New York, United States of America
| | - Avi Z. Rosenberg
- Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, Maryland, United States of America
| | - Taichi Murakami
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
- Department of Nephrology, Ehime Prefectural Central Hospital, Ehime, Japan
| | - Jeffrey B. Kopp
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Zsuzsanna Kuklenyik
- Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Andrew N. Hoofnagle
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
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Abstract
Viruses are ubiquitous in the environment and continue to have a profound impact on human health and disease. The COVID-19 pandemic has highlighted this with impressive morbidity and mortality affecting the world's population. Importantly, the link between viruses and hypertension, cardiovascular disease, and kidney disease has resulted in a renewed focus and attention on this potential relationship. The virus responsible for COVID-19, SARS-CoV-2, has a direct link to one of the major enzymatic regulatory systems connected to blood pressure control and hypertension pathogenesis, the renin-angiotensin system. This is because the entry point for SARS-CoV-2 is the ACE2 (angiotensin-converting enzyme 2) protein. ACE2 is one of the main enzymes responsible for dampening the primary effector peptide Ang II (angiotensin II), metabolizing it to Ang-(1-7). A myriad of clinical questions has since emerged and are covered in this review. Several other viruses have been linked to hypertension, cardiovascular disease, and kidney health. Importantly, patients with high-risk apolipoprotein L1 (APOL1) alleles are at risk for developing the kidney lesion of collapsing glomerulopathy after viral infection. This review will highlight several emerging viruses and their potential unique tropisms for the kidney and cardiovascular system. We focus on SARS-CoV-2 as this body of literature in regards to cardiovascular disease has advanced significantly since the COVID-19 pandemic.
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Affiliation(s)
- Solomiia Savedchuk
- Division of Nephrology, Department of Medicine, Duke University School of Medicine, Durham, NC (S.S., S.N., M.A.S.)
| | - Rasha Raslan
- Internal Medicine, Virginia Commonwealth University, Richmond (R.R.)
| | - Sarah Nystrom
- Division of Nephrology, Department of Medicine, Duke University School of Medicine, Durham, NC (S.S., S.N., M.A.S.)
| | - Matthew A Sparks
- Division of Nephrology, Department of Medicine, Duke University School of Medicine, Durham, NC (S.S., S.N., M.A.S.)
- Renal Section, Durham VA Health Care System, NC (M.A.S.)
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8
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McCarthy GM, Blasio A, Donovan OG, Schaller LB, Bock-Hughes A, Magraner JM, Suh JH, Tattersfield CF, Stillman IE, Shah SS, Zsengeller ZK, Subramanian B, Friedman DJ, Pollak MR. Recessive, gain-of-function toxicity in an APOL1 BAC transgenic mouse model mirrors human APOL1 kidney disease. Dis Model Mech 2021; 14:dmm048952. [PMID: 34350953 PMCID: PMC8353097 DOI: 10.1242/dmm.048952] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 06/21/2021] [Indexed: 12/26/2022] Open
Abstract
People of recent sub-Saharan African ancestry develop kidney failure much more frequently than other groups. A large fraction of this disparity is due to two coding sequence variants in the APOL1 gene. Inheriting two copies of these APOL1 risk variants, known as G1 and G2, causes high rates of focal segmental glomerulosclerosis (FSGS), HIV-associated nephropathy and hypertension-associated end-stage kidney disease. Disease risk follows a recessive mode of inheritance, which is puzzling given the considerable data that G1 and G2 are toxic gain-of-function variants. We developed coisogenic bacterial artificial chromosome (BAC) transgenic mice harboring either the wild-type (G0), G1 or G2 forms of human APOL1. Expression of interferon gamma (IFN-γ) via plasmid tail vein injection results in upregulation of APOL1 protein levels together with robust induction of heavy proteinuria and glomerulosclerosis in G1/G1 and G2/G2 but not G0/G0 mice. The disease phenotype was greater in G2/G2 mice. Neither heterozygous (G1/G0 or G2/G0) risk variant mice nor hemizygous (G1/-, G2/-) mice had significant kidney injury in response to IFN-γ, although the heterozygous mice had a greater proteinuric response than the hemizygous mice, suggesting that the lack of significant disease in humans heterozygous for G1 or G2 is not due to G0 rescue of G1 or G2 toxicity. Studies using additional mice (multicopy G2 and a non-isogenic G0 mouse) supported the notion that disease is largely a function of the level of risk variant APOL1 expression. Together, these findings shed light on the recessive nature of APOL1-nephropathy and present an important model for future studies.
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Affiliation(s)
- Gizelle M. McCarthy
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Angelo Blasio
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Olivia G. Donovan
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Lena B. Schaller
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Althea Bock-Hughes
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Jose M. Magraner
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Jung Hee Suh
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Calum F. Tattersfield
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Isaac E. Stillman
- Dept. of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Shrijal S. Shah
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Zsuzsanna K. Zsengeller
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Balajikarthick Subramanian
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - David J. Friedman
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
| | - Martin R. Pollak
- Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA
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9
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Ekulu PM, Adebayo OC, Decuypere JP, Bellucci L, Elmonem MA, Nkoy AB, Mekahli D, Bussolati B, van den Heuvel LP, Arcolino FO, Levtchenko EN. Novel Human Podocyte Cell Model Carrying G2/G2 APOL1 High-Risk Genotype. Cells 2021; 10:cells10081914. [PMID: 34440683 PMCID: PMC8391400 DOI: 10.3390/cells10081914] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/20/2021] [Accepted: 07/23/2021] [Indexed: 02/01/2023] Open
Abstract
Apolipoprotein L1 (APOL1) high-risk genotypes (HRG), G1 and G2, increase the risk of various non-diabetic kidney diseases in the African population. To date, the precise mechanisms by which APOL1 risk variants induce injury on podocytes and other kidney cells remain unclear. Trying to unravel these mechanisms, most studies have used animal or cell models created by gene editing. We developed and characterised conditionally immortalised human podocyte cell lines derived from urine of a donor carrying APOL1 HRG G2/G2. Following induction of APOL1 expression by polyinosinic-polycytidylic acid (poly(I:C)), we assessed functional features of APOL1-induced podocyte dysfunction. As control, APOL1 wild type (G0/G0) podocyte cell line previously generated from a Caucasian donor was used. Upon exposure to poly(I:C), G2/G2 and G0/G0 podocytes upregulated APOL1 expression resulting in podocytes detachment, decreased cells viability and increased apoptosis rate in a genotype-independent manner. Nevertheless, G2/G2 podocyte cell lines exhibited altered features, including upregulation of CD2AP, alteration of cytoskeleton, reduction of autophagic flux and increased permeability in an in vitro model under continuous perfusion. The human APOL1 G2/G2 podocyte cell model is a useful tool for unravelling the mechanisms of APOL1-induced podocyte injury and the cellular functions of APOL1.
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Affiliation(s)
- Pepe M. Ekulu
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
- Department of Paediatrics, Division of Nephrology, Faculty of Medicine, University Hospital of Kinshasa, University of Kinshasa, Kinshasa, Democratic Republic of the Congo
| | - Oyindamola C. Adebayo
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Jean-Paul Decuypere
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
| | - Linda Bellucci
- Department of Molecular Biotechnology and Health Sciences, University of Turin, 10124 Turin, Italy; (L.B.); (B.B.)
| | - Mohamed A. Elmonem
- Department of Clinical and Chemical Pathology, Faculty of Medicine, Cairo University, Cairo 11628, Egypt;
| | - Agathe B. Nkoy
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
- Department of Paediatrics, Division of Nephrology, Faculty of Medicine, University Hospital of Kinshasa, University of Kinshasa, Kinshasa, Democratic Republic of the Congo
| | - Djalila Mekahli
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
- Department of Paediatrics, Division of Nephrology, University Hospitals Leuven, 3000 Leuven, Belgium
| | - Benedetta Bussolati
- Department of Molecular Biotechnology and Health Sciences, University of Turin, 10124 Turin, Italy; (L.B.); (B.B.)
| | - Lambertus P. van den Heuvel
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
- Department of Paediatric Nephrology, Radboud University Medical Centre, 6500 Nijmegen, The Netherlands
| | - Fanny O. Arcolino
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
- Correspondence: ; Tel.: +32-16372647
| | - Elena N. Levtchenko
- Department of Development and Regeneration, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; (P.M.E.); (O.C.A.); (J.-P.D.); (A.B.N.); (D.M.); (L.P.v.d.H.); (E.N.L.)
- Department of Paediatrics, Division of Nephrology, University Hospitals Leuven, 3000 Leuven, Belgium
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Ultsch M, Holliday MJ, Gerhardy S, Moran P, Scales SJ, Gupta N, Oltrabella F, Chiu C, Fairbrother W, Eigenbrot C, Kirchhofer D. Structures of the ApoL1 and ApoL2 N-terminal domains reveal a non-classical four-helix bundle motif. Commun Biol 2021; 4:916. [PMID: 34316015 PMCID: PMC8316464 DOI: 10.1038/s42003-021-02387-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 06/23/2021] [Indexed: 02/07/2023] Open
Abstract
Apolipoprotein L1 (ApoL1) is a circulating innate immunity protein protecting against trypanosome infection. However, two ApoL1 coding variants are associated with a highly increased risk of chronic kidney disease. Here we present X-ray and NMR structures of the N-terminal domain (NTD) of ApoL1 and of its closest relative ApoL2. In both proteins, four of the five NTD helices form a four-helix core structure which is different from the classical four-helix bundle and from the pore-forming domain of colicin A. The reactivity with a conformation-specific antibody and structural models predict that this four-helix motif is also present in the NTDs of ApoL3 and ApoL4, suggesting related functions within the small ApoL family. The long helix 5 of ApoL1 is conformationally flexible and contains the BH3-like region. This BH3-like α-helix resembles true BH3 domains only in sequence and structure but not in function, since it does not bind to the pro-survival members of the Bcl-2 family, suggesting a Bcl-2-independent role in cytotoxicity. These findings should expedite a more comprehensive structural and functional understanding of the ApoL immune protein family.
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Affiliation(s)
- Mark Ultsch
- Department of Structural Biology, Genentech Inc., South San Francisco, CA, USA
| | - Michael J Holliday
- Department of Early Discovery Biochemistry, Genentech Inc., South San Francisco, CA, USA
| | - Stefan Gerhardy
- Department of Early Discovery Biochemistry, Genentech Inc., South San Francisco, CA, USA
| | - Paul Moran
- Department of Early Discovery Biochemistry, Genentech Inc., South San Francisco, CA, USA
| | - Suzie J Scales
- Department of Immunology, Genentech Inc., South San Francisco, CA, USA
| | - Nidhi Gupta
- Department of Immunology, Genentech Inc., South San Francisco, CA, USA
| | | | - Cecilia Chiu
- Department of Antibody Engineering, Genentech Inc., South San Francisco, CA, USA
| | - Wayne Fairbrother
- Department of Early Discovery Biochemistry, Genentech Inc., South San Francisco, CA, USA
| | - Charles Eigenbrot
- Department of Structural Biology, Genentech Inc., South San Francisco, CA, USA
| | - Daniel Kirchhofer
- Department of Early Discovery Biochemistry, Genentech Inc., South San Francisco, CA, USA.
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Yusuf AA, Govender MA, Brandenburg JT, Winkler CA. Kidney disease and APOL1. Hum Mol Genet 2021; 30:R129-R137. [PMID: 33744923 PMCID: PMC8117447 DOI: 10.1093/hmg/ddab024] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 01/12/2021] [Accepted: 01/12/2021] [Indexed: 01/03/2023] Open
Affiliation(s)
- Aminu Abba Yusuf
- Department of Haematology, Bayero University Kano and Aminu Kano Teaching Hospital, Kano, Nigeria
| | - Melanie A Govender
- Faculty of Health Sciences, Sydney Brenner Institute for Molecular Bioscience, University of the Witwatersrand, Johannesburg, South Africa
| | - Jean-Tristan Brandenburg
- Faculty of Health Sciences, Sydney Brenner Institute for Molecular Bioscience, University of the Witwatersrand, Johannesburg, South Africa
| | - Cheryl A Winkler
- Molecular Genetic Epidemiology Section, Basic Research Laboratory, Frederick National Laboratory for Cancer Research, NCI, Frederick, MD 21701, USA
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Laboux T, Gibier JB, Pottier N, Glowacki F, Hamroun A. COVID-19-related collapsing glomerulopathy revealing a rare risk variant of APOL1: lessons for the clinical nephrologist. J Nephrol 2021; 34:373-378. [PMID: 33548053 PMCID: PMC7865108 DOI: 10.1007/s40620-020-00935-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 11/20/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Timothée Laboux
- Kidney Transplantation and Dialysis Department, University of Lille, CHU Lille, 59037, Lille, France.
- RID-AGE, INSERM U1167, 59000, Lille, France.
| | - Jean-Baptiste Gibier
- Department of Pathology, Pathology Institute, Lille University, Regional and University Hospital Center of Lille, Lille, France
- INSERM UMR-S1172 Lille, JPARC-Jean-Pierre Aubert Research Center, Team Mucins, Epithelial Differentiation and Carcinogenesis, 59037, Lille, France
| | - Nicolas Pottier
- Toxicology and Genopathy Department, CHU Lille, 59000, Lille, France
- INSERM U1190, Translational Research for Diabetes, Lille, France
| | - François Glowacki
- Kidney Transplantation and Dialysis Department, University of Lille, CHU Lille, 59037, Lille, France
- CNRS, INSERM, Lille University, UMR9020- UMR-S 1277, F-59000, Lille, France
| | - Aghilès Hamroun
- Kidney Transplantation and Dialysis Department, University of Lille, CHU Lille, 59037, Lille, France
- Clinical Epidemiology Team, Center for Research in Epidemiology and Population Health, INSERM, Paris-Saclay University, Versailles Saint-Quentin University, CESP, 94807, Villejuif, France
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13
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Pays E. The function of apolipoproteins L (APOLs): relevance for kidney disease, neurotransmission disorders, cancer and viral infection. FEBS J 2021; 288:360-381. [PMID: 32530132 PMCID: PMC7891394 DOI: 10.1111/febs.15444] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/24/2020] [Accepted: 06/03/2020] [Indexed: 12/17/2022]
Abstract
The discovery that apolipoprotein L1 (APOL1) is the trypanolytic factor of human serum raised interest about the function of APOLs, especially following the unexpected finding that in addition to their protective action against sleeping sickness, APOL1 C-terminal variants also cause kidney disease. Based on the analysis of the structure and trypanolytic activity of APOL1, it was proposed that APOLs could function as ion channels of intracellular membranes and be involved in mechanisms triggering programmed cell death. In this review, the recent finding that APOL1 and APOL3 inversely control the synthesis of phosphatidylinositol-4-phosphate (PI(4)P) by the Golgi PI(4)-kinase IIIB (PI4KB) is commented. APOL3 promotes Ca2+ -dependent activation of PI4KB, but due to their increased interaction with APOL3, APOL1 C-terminal variants can inactivate APOL3, leading to reduction of Golgi PI(4)P synthesis. The impact of APOLs on several pathological processes that depend on Golgi PI(4)P levels is discussed. I propose that through their effect on PI4KB activity, APOLs control not only actomyosin activities related to vesicular trafficking, but also the generation and elongation of autophagosomes induced by inflammation.
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Affiliation(s)
- Etienne Pays
- Laboratory of Molecular ParasitologyIBMMUniversité Libre de BruxellesGosseliesBelgium
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Abstract
This study aimed to screen autophagy-related genes (ARGs) that affect the prognosis of pancreatic cancer patients based on The Cancer Genome Atlas (TCGA) gene expression data and genotype-tissue expression (GTEx) databases. The expression data of pancreatic cancer and normal pancreas were downloaded from TCGA and GTEx databases. Human ARGs list was obtained through the Human Autophagy Database (HADB) and GeneCards database. The Wilcox test was performed to screen differentially expressed ARGs. Differentially expressed ARGs were analyzed by gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) functional enrichment analyses. The CIBER-SORT algorithm was utilized to analyze immune cell infiltration in samples. A total of 21 up-regulated ARGs and 11 down-regulated ARGs were screened in the TCGA-GTEx integrated data set. The enrichment analysis of GO and KEGG showed that 32 differentially expressed ARGs were significantly enriched in autophagy-related pathways. Univariate Cox regression analysis showed that 12 candidate ARGs were significantly related to the prognosis of pancreatic cancer patients. Multivariate Cox regression analysis found that ATG16L2, GNAI3, APOL1, and PTK6 genes may be the key ARGs affecting the prognosis of pancreatic cancer patients. Based on these four key ARGs, a prognostic risk assessment model was constructed, and pancreatic cancer patients were classified into the high-risk and low-risk group according to the risk value. Survival analysis and ROC analysis confirmed that the prognostic risk assessment model can accurately predict the prognosis of patients with pancreatic cancer. Immune infiltration analysis found that B cells naive, B cells memory, plasma cells, T cells CD8, T cells CD4 memory resting, monocytes and macrophages M0 were significantly different in tissue samples of pancreatic cancer patients in the high and low risk groups. Pearson's correlation coefficient showed that the four key ARGs may affect the development of pancreatic cancer by affecting immune cell components in the tumor micro-environment. In conclusion, ATG16L2, GNAI3, APOL1, and PTK6 may be related to the prognosis of pancreatic cancer patients. The prognostic risk assessment model constructed based on these four key ARGs could accurately predict the prognosis of pancreatic cancer patients.
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Affiliation(s)
- Qing Zhou
- Central Laboratory, People's Hospital of Baoan District, Shenzhen 518000, P.R. China
| | - Xi Chen
- Central Laboratory, People's Hospital of Baoan District, Shenzhen 518000, P.R. China
| | - Qiuyan Chen
- Science and Education Department, Shenzhen Baoan Shiyan People's Hospital, Shenzhen 518000, P.R. China
| | - Haosheng Liu
- Central Laboratory, People's Hospital of Baoan District, Shenzhen 518000, P.R. China
| | - Lu Hao
- Science and Education Department, Shenzhen Baoan Shiyan People's Hospital, Shenzhen 518000, P.R. China
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Wang DP, Yu ZX, He ZC, Liao JF, Shen XB, Zhu PL, Chen WN, Lin X, Xu SH. Apolipoprotein L1 is transcriptionally regulated by SP1, IRF1 and IRF2 in hepatoma cells. FEBS Lett 2020; 594:3108-3121. [PMID: 32671843 DOI: 10.1002/1873-3468.13887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/21/2020] [Accepted: 07/05/2020] [Indexed: 11/07/2022]
Abstract
Apolipoprotein L1 (APOL1) participates in lipid metabolism. Here, we investigate the mechanisms regulating APOL1 gene expression in hepatoma cells. We demonstrate that the -80-nt to +31-nt region of the APOL1 promoter, which contains one SP transcription factor binding GT box and an interferon regulatory factor (IRF) binding ISRE element, maintains the maximum activity. Mutation of the GT box and ISRE element dramatically reduces APOL1 promoter activity. EMSA and chromatin immunoprecipitation assay reveal that the transcription factors Sp1, IRF1 and IRF2 could interact with their cognate binding sites on the APOL1 promoter. Overexpression of Sp1, IRF1 and IRF2 increases promoter activity, leading to increased APOL1 mRNA and protein levels, while knockdown of Sp1, IRF1 and IRF2 has the opposite effects. These results demonstrate that the APOL1 gene could be regulated by Sp1, IRF1 and IRF2 in hepatoma cells.
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Affiliation(s)
- De-Ping Wang
- Department of Medical Intensive Care Unit, Fujian Provincial Hospital, Provincial Clinical Medical College of Fujian Medical University, Fuzhou, China
- Key Laboratory of Gastrointestinal Cancer (Fujian Medical University), Ministry of Education, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
- Department of Endocrinology and Metabolism, Hongqi Hospital of MuDanJiang Medical College, Mudanjiang, China
| | - Zhao-Xi Yu
- Department of Medical Intensive Care Unit, Fujian Provincial Hospital, Provincial Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Zong-Cun He
- Key Laboratory of Gastrointestinal Cancer (Fujian Medical University), Ministry of Education, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Jin-Fu Liao
- Key Laboratory of Gastrointestinal Cancer (Fujian Medical University), Ministry of Education, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Xue-Bin Shen
- Key Laboratory of Gastrointestinal Cancer (Fujian Medical University), Ministry of Education, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
- Department of Cardiology, Affiliated Nanping First Hospital, Fujian Medical University, Nanping, China
| | - Peng-Li Zhu
- Department of Medical Intensive Care Unit, Fujian Provincial Hospital, Provincial Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Wan-Nan Chen
- Key Laboratory of Gastrointestinal Cancer (Fujian Medical University), Ministry of Education, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Xu Lin
- Key Laboratory of Gastrointestinal Cancer (Fujian Medical University), Ministry of Education, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Shang-Hua Xu
- Department of Cardiology, Affiliated Nanping First Hospital, Fujian Medical University, Nanping, China
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Li D, Snipes JA, Murea M, Molina AJA, Divers J, Freedman BI, Ma L, Petrovic S. An Acidic Environment Induces APOL1-Associated Mitochondrial Fragmentation. Am J Nephrol 2020; 51:695-704. [PMID: 32866949 DOI: 10.1159/000509989] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 07/03/2020] [Indexed: 11/19/2022]
Abstract
BACKGROUND Apolipoprotein L1 gene (APOL1) G1 and G2 kidney-risk variants (KRVs) cause CKD in African Americans, inducing mitochondrial dysfunction. Modifying factors are required, because a minority of individuals with APOL1 high-risk genotypes develop nephropathy. Given that APOL1 function is pH-sensitive and the pH of the kidney interstitium is <7, we hypothesized the acidic kidney interstitium may facilitate APOL1 KRV-induced mitochondrial dysfunction. METHODS Human embryonic kidney (HEK293) cells conditionally expressing empty vector (EV), APOL1-reference G0, and G1 or G2 KRVs were incubated in media pH 6.8 or 7.4 for 4, 6, or 8 h. Genotype-specific pH effects on mitochondrial length (µm) were assessed using confocal microscopy in live cells and Fiji derivative of ImageJ software with MiNA plug-in. Lower mitochondrial length indicated fragmentation and early dysfunction. RESULTS After 6 h doxycycline (Dox) induction in pH 6.8 media, G2-expressing cells had shorter mitochondria (6.54 ± 0.40) than cells expressing EV (7.65 ± 0.72, p = 0.02) or G0 (7.46 ± 0.31, p = 0.003). After 8 h Dox induction in pH 6.8 media, both G1- (6.21 ± 0.26) and G2-expressing cells had shorter mitochondria (6.46 ± 0.34) than cells expressing EV (7.13 ± 0.32, p = 0.002 and p = 0.008, respectively) or G0 (7.22 ± 0.45, p = 0.003 and p = 0.01, respectively). Mitochondrial length in cells incubated in pH 7.4 media were comparable after 8 h Dox induction regardless of genotype. APOL1 mRNA expression and cell viability were comparable regardless of pH or genotype after 8 h Dox induction. CONCLUSION Acidic pH facilitates early mitochondrial dysfunction induced by APOL1 G1 and G2 KRVs in HEK293 cells. We propose that the acidic kidney interstitium may play a role in APOL1-mediated mitochondrial pathophysiology and nephropathy.
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Affiliation(s)
- DengFeng Li
- Department of Biology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - James A Snipes
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Mariana Murea
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Anthony J A Molina
- Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Jasmin Divers
- Division of Public Health Sciences, Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Barry I Freedman
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Lijun Ma
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA,
| | - Snezana Petrovic
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
- Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
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Fang J, Yao X, Hou M, Duan M, Xing L, Huang J, Wang Y, Zhu B, Chen Q, Wang H. ApoL1 induces kidney inflammation through RIG-I/NF-κB activation. Biochem Biophys Res Commun 2020; 527:466-473. [PMID: 32336543 DOI: 10.1016/j.bbrc.2020.04.054] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 04/11/2020] [Indexed: 02/07/2023]
Abstract
The genetic variations of the apolipoprotein L1 (APOL1) gene are associated with non-diabetic kidney diseases. However, very little is known about the role of ApoL1 in glomerular damage. Here, we aimed to identify the function and mechanism of ApoL1 in glomerular damage. The mice were randomly divided into two groups: one group was intraperitoneally injected with phosphate buffer saline (PBS), while the other group was intraperitoneally injected with recombinant ApoL1 every other day for 3 months. Hematoxylin and eosin (HE) and periodic acid Schiff (PAS) staining were used to demonstrate the effects of ApoL1 on kidney inflammation and injury. Furthermore, quantitative real-time polymerase chain reaction (qRT-PCR) and enzyme-linked immunosorbent assay (ELISA) analyses revealed that ApoL1-treated mice exhibited enhanced expression of various inflammation markers in the kidney and serum compared to the PBS-treated mice. Immunofluorescence staining revealed that ApoL1 accumulated in kidney podocytes. Treatment with ApoL1 dose-dependently increased the expression of inflammation markers and apoptotic markers. The abnormal gene expression associated with ApoL1-mediated podocyte inflammation was evaluated using microarray analysis. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses revealed that the upregulated genes were enriched in the inflammation-related processes, such as the RIG-I/NF-κB signaling pathway. Consistently, the knockdown of RIG-I significantly mitigated the ApoL1-induced upregulation of inflammatory and apoptotic markers in the human podocytes. Additionally, the ApoL1-induced glomerular damage was attenuated in AAV-shRIG-I mice. Therefore, the effects of ApoL1 on glomerular damage may be, at least partially, through inducing abnormal expression of inflammatory molecules, which may have important implications for treatment of kidney diseases.
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Affiliation(s)
- Ji Fang
- Department of Nephrology, Laboratory of Renal Disease, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200062, People's Republic of China
| | - Xingmei Yao
- Department of Nephrology, Laboratory of Renal Disease, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200062, People's Republic of China
| | - Mingqiang Hou
- Department of Urology, Xishui County People's Hospital, Guizhou Province, Guizhou, 564699, People's Republic of China
| | - Miao Duan
- Department of Urology, Xishui County People's Hospital, Guizhou Province, Guizhou, 564699, People's Republic of China
| | - Lina Xing
- Department of Nephrology, Laboratory of Renal Disease, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200062, People's Republic of China
| | - Jiebo Huang
- Department of Nephrology, Laboratory of Renal Disease, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200062, People's Republic of China
| | - Yunman Wang
- Department of Nephrology, Laboratory of Renal Disease, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200062, People's Republic of China
| | - Bingbing Zhu
- Department of Nephrology, Laboratory of Renal Disease, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200062, People's Republic of China
| | - Qiujing Chen
- Institute of Cardiovascular Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, 200025, People's Republic of China.
| | - Hao Wang
- Department of Nephrology, Laboratory of Renal Disease, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200062, People's Republic of China.
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Abstract
Interest in trypanosome lytic factors (TLFs) and apolipoprotein L1, the ion channel-forming protein component of TLFs, has increased tenfold since 2010. This is due to the association of African variants of APOL1 with kidney disease such that interest has reached circles beyond parasitology. We have extensive experience purifying and working with these proteins and protein complexes. Herein we describe our detailed purification protocols to aid the new burgeoning field by providing an opportunity for consistency in reagents used across laboratories. We emphasize that it is imperative to maintain APOL1 protein intact (~42 kDa) to analyze the active ion channel-forming component/protein.
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Affiliation(s)
- Joseph Verdi
- Hunter College, City University of New York, New York, NY, USA
- Ph.D. Program in Biology, The Graduate Center of the City University of New York, New York, NY, USA
| | - Charles Schaub
- Hunter College, City University of New York, New York, NY, USA
- Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, New York, NY, USA
| | - Russell Thomson
- Hunter College, City University of New York, New York, NY, USA
| | - Jayne Raper
- Hunter College, City University of New York, New York, NY, USA.
- Ph.D. Program in Biology, The Graduate Center of the City University of New York, New York, NY, USA.
- Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, New York, NY, USA.
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Bruggeman LA, Wu Z, Luo L, Madhavan S, Drawz PE, Thomas DB, Barisoni L, O'Toole JF, Sedor JR. APOL1-G0 protects podocytes in a mouse model of HIV-associated nephropathy. PLoS One 2019; 14:e0224408. [PMID: 31661509 PMCID: PMC6818796 DOI: 10.1371/journal.pone.0224408] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 10/11/2019] [Indexed: 11/21/2022] Open
Abstract
African polymorphisms in the gene for Apolipoprotein L1 (APOL1) confer a survival advantage against lethal trypanosomiasis but also an increased risk for several chronic kidney diseases (CKD) including HIV-associated nephropathy (HIVAN). APOL1 is expressed in renal cells, however, the pathogenic events that lead to renal cell damage and kidney disease are not fully understood. The podocyte function of APOL1-G0 versus APOL1-G2 in the setting of a known disease stressor was assessed using transgenic mouse models. Transgene expression, survival, renal pathology and function, and podocyte density were assessed in an intercross of a mouse model of HIVAN (Tg26) with two mouse models that express either APOL1-G0 or APOL1-G2 in podocytes. Mice that expressed HIV genes developed heavy proteinuria and glomerulosclerosis, and had significant losses in podocyte numbers and reductions in podocyte densities. Mice that co-expressed APOL1-G0 and HIV had preserved podocyte numbers and densities, with fewer morphologic manifestations typical of HIVAN pathology. Podocyte losses and pathology in mice co-expressing APOL1-G2 and HIV were not significantly different from mice expressing only HIV. Podocyte hypertrophy, a known compensatory event to stress, was increased in the mice co-expressing HIV and APOL1-G0, but absent in the mice co-expressing HIV and APOL1-G2. Mortality and renal function tests were not significantly different between groups. APOL1-G0 expressed in podocytes may have a protective function against podocyte loss or injury when exposed to an environmental stressor. This was absent with APOL1-G2 expression, suggesting APOL1-G2 may have lost this protective function.
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Affiliation(s)
- Leslie A. Bruggeman
- Departments of Inflammation & Immunity and Nephrology, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
- * E-mail:
| | - Zhenzhen Wu
- Departments of Inflammation & Immunity and Nephrology, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Liping Luo
- Departments of Inflammation & Immunity and Nephrology, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Sethu Madhavan
- Department of Medicine, Ohio State University, Columbus, Ohio, United States of America
| | - Paul E. Drawz
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - David B. Thomas
- Departments of Pathology, University of Miami, Miami, Florida, United States of America
| | - Laura Barisoni
- Departments of Pathology and Medicine, Duke University, Durham, North Carolina, United States of America
| | - John F. O'Toole
- Departments of Inflammation & Immunity and Nephrology, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - John R. Sedor
- Departments of Inflammation & Immunity and Nephrology, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
- Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
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Davis SE, Khatua AK, Popik W. Nucleosomal dsDNA Stimulates APOL1 Expression in Human Cultured Podocytes by Activating the cGAS/IFI16-STING Signaling Pathway. Sci Rep 2019; 9:15485. [PMID: 31664093 PMCID: PMC6820523 DOI: 10.1038/s41598-019-51998-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 10/08/2019] [Indexed: 12/31/2022] Open
Abstract
APOL1 alleles G1 and G2 are associated with faster progression to lupus nephritis (LN)-associated end-stage renal disease (LN-ESRD) in African Americans. Increased levels of type I interferons (IFNs) and nucleosome-associated double-stranded DNA (dsDNA) fragments (nsDNA) are the hallmark of this disease. Here, we identify cyclic GMP-AMP synthase (cGAS) and interferon-inducible protein 16 (IFI16) as the major DNA sensors in human immortalized podocytes. We also show that nsDNA triggers the expression of APOL1 and IFNβ via IRF3 activation through the cGAS/IFI16-STING pathway. We demonstrate that maximal APOL1 expression also requires the activation of type I IFN receptor (IFNAR) and STAT1 signaling triggered by IFNβ produced in response to nsDNA, or by exogenous IFNβ. Finally, we show that STAT1 activation is sufficient to upregulate IFI16, subsequently boosting APOL1 expression through a positive feedback mechanism. Collectively, we find that nsDNA-induced APOL1 expression is mediated by both IFNβ-independent and dependent signaling pathways triggered by activation of the cGAS/IFI16-STING pathway. We propose that simultaneous inhibition of STING and the IFNAR-STAT1 pathway may attenuate IFI16 expression, reduce IFI16-cGAS cross-talk, and prevent excessive APOL1 expression in human podocytes in response to nsDNA.
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Affiliation(s)
- Shamara E Davis
- Meharry Medical College, Center for AIDS Health Disparities Research, Department of Microbiology and Immunology, Nashville, TN, 37208, USA
| | - Atanu K Khatua
- Meharry Medical College, Center for AIDS Health Disparities Research, Department of Microbiology and Immunology, Nashville, TN, 37208, USA
| | - Waldemar Popik
- Meharry Medical College, Center for AIDS Health Disparities Research, Department of Microbiology and Immunology, Nashville, TN, 37208, USA.
- Department of Internal Medicine, 1005 D. B. Todd Blvd, Nashville, TN, 37208, USA.
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Zhang SY, Jouanguy E, Zhang Q, Abel L, Puel A, Casanova JL. Human inborn errors of immunity to infection affecting cells other than leukocytes: from the immune system to the whole organism. Curr Opin Immunol 2019; 59:88-100. [PMID: 31121434 PMCID: PMC6774828 DOI: 10.1016/j.coi.2019.03.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 03/29/2019] [Indexed: 01/19/2023]
Abstract
Studies of vertebrate immunity have traditionally focused on professional cells, including circulating and tissue-resident leukocytes. Evidence that non-professional cells are also intrinsically essential (i.e. not via their effect on leukocytes) for protective immunity in natural conditions of infection has emerged from three lines of research in human genetics. First, studies of Mendelian resistance to infection have revealed an essential role of DARC-expressing erythrocytes in protection against Plasmodium vivax infection, and an essential role of FUT2-expressing intestinal epithelial cells for protection against norovirus and rotavirus infections. Second, studies of inborn errors of non-hematopoietic cell-extrinsic immunity have shown that APOL1 and complement cascade components secreted by hepatocytes are essential for protective immunity to trypanosome and pyogenic bacteria, respectively. Third, studies of inborn errors of non-hematopoietic cell-intrinsic immunity have suggested that keratinocytes, pulmonary epithelial cells, and cortical neurons are essential for tissue-specific protective immunity to human papillomaviruses, influenza virus, and herpes simplex virus, respectively. Various other types of genetic resistance or predisposition to infection in human populations are not readily explained by inborn variants of genes operating in leukocytes and may, therefore, involve defects in other cells. The probing of this unchartered territory by human genetics is reshaping immunology, by scaling immunity to infection up from the immune system to the whole organism.
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Affiliation(s)
- Shen-Ying Zhang
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY 10065, USA; Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR 1163, Necker Hospital for Sick Children, 75015 Paris, France; Paris Descartes University, Imagine Institute, 75015 Paris, France
| | - Emmanuelle Jouanguy
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY 10065, USA; Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR 1163, Necker Hospital for Sick Children, 75015 Paris, France; Paris Descartes University, Imagine Institute, 75015 Paris, France
| | - Qian Zhang
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY 10065, USA
| | - Laurent Abel
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY 10065, USA; Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR 1163, Necker Hospital for Sick Children, 75015 Paris, France; Paris Descartes University, Imagine Institute, 75015 Paris, France
| | - Anne Puel
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY 10065, USA; Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR 1163, Necker Hospital for Sick Children, 75015 Paris, France; Paris Descartes University, Imagine Institute, 75015 Paris, France
| | - Jean-Laurent Casanova
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY 10065, USA; Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR 1163, Necker Hospital for Sick Children, 75015 Paris, France; Paris Descartes University, Imagine Institute, 75015 Paris, France; Pediatric Hematology-Immunology Unit, Necker Hospital for Sick Children, 75015 Paris, France; Howard Hughes Medical Institute, New York, NY 10065, USA.
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22
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Ryu JH, Ge M, Merscher S, Rosenberg AZ, Desante M, Roshanravan H, Okamoto K, Shin MK, Hoek M, Fornoni A, Kopp JB. APOL1 renal risk variants promote cholesterol accumulation in tissues and cultured macrophages from APOL1 transgenic mice. PLoS One 2019; 14:e0211559. [PMID: 30998685 PMCID: PMC6472726 DOI: 10.1371/journal.pone.0211559] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 01/16/2019] [Indexed: 02/06/2023] Open
Abstract
Apolipoprotein L1 (APOL1) genetic variants G1 and G2, compared to the common allele G0, are major risk factors for non-diabetic kidney disease in African descent populations. APOL1 is a minor protein component of HDL, as well as being expressed in podocytes and vascular cells. Reverse cholesterol transport involves the transport of cholesterol to HDL by cellular ATP-binding cassette; ABCA1 and ABCG1 with subsequent delivery from peripheral tissues to the liver. With impaired reverse cholesterol transport, lipid accumulation occurs and macrophages morphologically transform into foam cells, releasing inflammatory factors. We asked whether the APOL1 risk variants alter peripheral cholesterol metabolism and specifically affect macrophage cholesterol efflux. Tissues and bone marrow (BM)-derived monocytes were isolated from wild-type mice (WT) and from BAC/APOL1 transgenic (APOL1-G0, APOL1-G1, and APOL1-G2) mice, which carry a bacterial artificial chromosome that contains the human APOL1 genomic region. Monocytes were differentiated into macrophages using M-CSF, and then polarized into M1 and M2 macrophages. Cholesterol content, cholesterol efflux, and ABCA1 and ABCG1 mRNA expression were measured. Kidney, spleen, and bone marrow-derived macrophages from APOL1-G1 and -G2 mice showed increased cholesterol accumulation and decreased ABCA1 and ABCG1 mRNA levels. BM-derived macrophages from APOL1-G1 and -G2 mice showed significantly reduced cholesterol efflux compared to WT or APOL1-G0 macrophages. Taken together, the evidence suggests that APOL1-G1 and -G2 risk variants impaired reverse cholesterol transport through decreased expression of cholesterol efflux transporters suggesting a possible mechanism to promote macrophage foam cell formation, driving inflammation in the glomerulus and renal interstitium.
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Affiliation(s)
- Jung-Hwa Ryu
- Kidney Disease Section, NIDDK, NIH, Bethesda, Maryland, United States of America
| | - Mengyuan Ge
- Katz Family Division of Nephrology and Hypertension and Peggy and Harold Katz Drug Discovery Center, University of Miami School of Medicine, Miami, Florida, United States of America
| | - Sandra Merscher
- Katz Family Division of Nephrology and Hypertension and Peggy and Harold Katz Drug Discovery Center, University of Miami School of Medicine, Miami, Florida, United States of America
| | - Avi Z. Rosenberg
- Dvision of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America
| | - Marco Desante
- Dvision of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America
| | - Hila Roshanravan
- Kidney Disease Section, NIDDK, NIH, Bethesda, Maryland, United States of America
| | - Koji Okamoto
- Kidney Disease Section, NIDDK, NIH, Bethesda, Maryland, United States of America
| | - Myung K. Shin
- Merck & Company, Inc., Kennilworth, New Jersey, United States of America
| | - Maarten Hoek
- Merck & Company, Inc., Kennilworth, New Jersey, United States of America
| | - Alessia Fornoni
- Katz Family Division of Nephrology and Hypertension and Peggy and Harold Katz Drug Discovery Center, University of Miami School of Medicine, Miami, Florida, United States of America
- * E-mail: (JK); (AF)
| | - Jeffrey B. Kopp
- Kidney Disease Section, NIDDK, NIH, Bethesda, Maryland, United States of America
- * E-mail: (JK); (AF)
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23
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Kumar V, Paliwal N, Ayasolla K, Vashistha H, Jha A, Chandel N, Chowdhary S, Saleem MA, Malhotra A, Chander PN, Skorecki K, Singhal PC. Disruption of APOL1-miR193a Axis Induces Disorganization of Podocyte Actin Cytoskeleton. Sci Rep 2019; 9:3582. [PMID: 30837512 PMCID: PMC6401370 DOI: 10.1038/s41598-019-39376-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 10/22/2018] [Indexed: 02/08/2023] Open
Abstract
APOL1-miR193a axis participates in the preservation of molecular phenotype of differentiated podocytes (DPDs). We examined the hypothesis that APOL1 (G0) preserves, but APOL1 risk alleles (G1 and G2) disrupt APOL1-miR193a axis in DPDs. DPDG0s displayed down-regulation of miR193a, but upregulation of nephrin expression. DPDG1s/G2s exhibited an increase in miR193a and down-regulation of the expression of adherens complex's constituents (CD2AP, nephrin, and dendrin). DPDG0s showed decreased Cathepsin L, enhanced dynamin expressions, and the intact actin cytoskeleton. On the contrary, DPDG1s/G2s displayed an increase in Cathepsin L, but down-regulation of dynamin expressions and disorganization of the actin cytoskeleton. APOL1 silencing enhanced miR193a and Cathepsin L, but down-regulated dynamin expressions. DPDG1s/G2s displayed nuclear import of dendrin, indicating an occurrence of destabilization of adherens complexes in APOL1 risk milieu. These findings suggest that DPDG1s and DPDG2s developed disorganized actin cytoskeleton as a consequence of disrupted APOL1-miR193a axis. Interestingly, docking and co-labeling studies suggested an interaction between APOL1 and CD2AP. APOL1G1/G1 and APOL1G1/G2 transgenic mice displayed nuclear import of dendrin indicating destabilization of adherens complexes in podocytes; moreover, these mice showed a four-fold increase in urinary albumin to creatinine ratio and development of focal segmental glomerular lesions.
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Affiliation(s)
- Vinod Kumar
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA
| | - Nitpriya Paliwal
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA
| | - Kamesh Ayasolla
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA
| | | | - Alok Jha
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA
| | - Nirupama Chandel
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA
| | - Sheetal Chowdhary
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA
| | | | - Ashwani Malhotra
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA
| | | | - Karl Skorecki
- Technion - Israel Institute of Technology, and Rambam Health Care Campus, Haifa, Israel
| | - Pravin C Singhal
- Immunology and Inflammation Center, Feinstein Institute for Medical Research and Zucker School of Medicine at Hofstra-Northwell, New York, USA.
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24
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Abstract
Apolipoprotein L1 (APOL1) genetic variants are potent risk factors for glomerular disease, but one or more additional factors are required for expression of glomerular disease. Uncontrolled or poorly controlled human immunodeficiency virus (HIV) infection is the most potent susceptibility factor for APOL1 nephropathy that has been identified to date. APOL1 variants are associated with HIV-associated nephropathy (HIVAN), a podocyte disease, but not with HIV-immune complex disease, primarily a disease of the mesangium. The mechanism by which HIV brings out the latent glomerular disease risk remains to be defined. There are at least two classes of candidate mechanisms to explain the potent interaction between HIV-1 and APOL1. First, APOL1 variant proteins and HIV accessory proteins implicated in HIVAN may target the same or related intracellular pathways in podocytes. Recent data suggest roles for interleukin 1b and transcription factor EB. Second, features of uncontrolled HIV infection, including increased circulating factors such as interferon, may drive APOL1 gene transcription or act upon podocytes in other ways. Deeper probing of APOL1-HIV interactions may yield insights that will aid in understanding HIVAN, APOL1 nephropathy, and podocyte biology.
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Affiliation(s)
- Jeffrey B Kopp
- Kidney Disease Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD.
| | - Jurgen Heymann
- Kidney Disease Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Cheryl A Winkler
- Basic Research Laboratory, National Cancer Institute, National Institutes of Health, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, MD
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25
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Lee H, Roshanravan H, Wang Y, Okamoto K, Ryu J, Shrivastav S, Qu P, Kopp JB. ApoL1 renal risk variants induce aberrant THP-1 monocyte differentiation and increase eicosanoid production via enhanced expression of cyclooxygenase-2. Am J Physiol Renal Physiol 2018; 315:F140-F150. [PMID: 29357411 PMCID: PMC6087794 DOI: 10.1152/ajprenal.00254.2017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 01/02/2018] [Accepted: 01/08/2018] [Indexed: 01/09/2023] Open
Abstract
Apolipoprotein L1 ( ApoL1) genetic variants are strongly associated with kidney diseases. We investigated the role of ApoL1 variants in monocyte differentiation and eicosanoid production in macrophages, as activated tissue macrophages in kidney might contribute to kidney injury. In human monocyte THP-1 cells, transient overexpression of ApoL1 (G0, G1, G2) by transfection resulted in a 5- to 11-fold increase in CD14 and CD68 gene expression, similar to that seen with phorbol-12-myristate acetate treatment. All ApoL1 variants caused monocytes to differentiate into atypical M1 macrophages with marked increase in M1 markers CD80, TNF, IL1B, and IL6 and modest increase in the M2 marker CD163 compared with control cells. ApoL1-G1 transfection induced additional CD206 and TGFB1 expression, and ApoL1-G2 transfection induced additional CD204 and TGFB1 expression. Gene expression of prostaglandin E2 (PGE2) synthase and thromboxane synthase and both gene and protein expression of cyclooxygenase-2 (COX-2) were increased by ApoL1-G1 and -G2 variants compared with -G0 transfection. Higher levels of PGE2 and thromboxane B2, a stable metabolite of thromboxane A2, and transforming growth factor (TGF)-β1 were released into the supernatant of cultured THP-1 cells transfected with ApoL1-G1 and -G2, but not -G0. The increase in PGE2, thromboxane B2, and TGF-β1 was inhibited by COX-2-specific inhibitor CAY10404 but not by COX-1-specific inhibitor SC-560. These results demonstrate a novel role of ApoL1 variants in the regulation of monocyte differentiation and eicosanoid metabolism, which could modify the immune response and promote inflammatory signaling within the local targeted organs and tissues including the kidney.
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Affiliation(s)
- Hewang Lee
- Institute of Heart and Vessel Diseases, Second Hospital, Dalian Medical University , Dalian , China
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Hila Roshanravan
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Ying Wang
- Institute of Heart and Vessel Diseases, Second Hospital, Dalian Medical University , Dalian , China
| | - Koji Okamoto
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Junghwa Ryu
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Shashi Shrivastav
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Peng Qu
- Institute of Heart and Vessel Diseases, Second Hospital, Dalian Medical University , Dalian , China
| | - Jeffrey B Kopp
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
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Mishra A, Ayasolla K, Kumar V, Lan X, Vashistha H, Aslam R, Hussain A, Chowdhary S, Marashi Shoshtari S, Paliwal N, Popik W, Saleem MA, Malhotra A, Meggs LG, Skorecki K, Singhal PC. Modulation of apolipoprotein L1-microRNA-193a axis prevents podocyte dedifferentiation in high-glucose milieu. Am J Physiol Renal Physiol 2018; 314:F832-F843. [PMID: 29357419 PMCID: PMC6031922 DOI: 10.1152/ajprenal.00541.2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 12/22/2017] [Accepted: 01/08/2018] [Indexed: 01/12/2023] Open
Abstract
The loss of podocyte (PD) molecular phenotype is an important feature of diabetic podocytopathy. We hypothesized that high glucose (HG) induces dedifferentiation in differentiated podocytes (DPDs) through alterations in the apolipoprotein (APO) L1-microRNA (miR) 193a axis. HG-induced DPD dedifferentiation manifested in the form of downregulation of Wilms' tumor 1 (WT1) and upregulation of paired box 2 (PAX2) expression. WT1-silenced DPDs displayed enhanced expression of PAX2. Immunoprecipitation of DPD cellular lysates with anti-WT1 antibody revealed formation of WT1 repressor complexes containing Polycomb group proteins, enhancer of zeste homolog 2, menin, and DNA methyltransferase (DNMT1), whereas silencing of either WT1 or DNMT1 disrupted this complex with enhanced expression of PAX2. HG-induced DPD dedifferentiation was associated with a higher expression of miR193a, whereas inhibition of miR193a prevented DPD dedifferentiation in HG milieu. HG downregulated DPD expression of APOL1. miR193a-overexpressing DPDs displayed downregulation of APOL1 and enhanced expression of dedifferentiating markers; conversely, silencing of miR193a enhanced the expression of APOL1 and preserved DPD phenotype. Moreover, stably APOL1G0-overexpressing DPDs displayed the enhanced expression of WT1 but attenuated expression of miR193a; nonetheless, silencing of APOL1 reversed these effects. Since silencing of APOL1 enhanced miR193a expression as well as dedifferentiation in DPDs, it appears that downregulation of APOL1 contributed to dedifferentiation of DPDs through enhanced miR193a expression in HG milieu. Vitamin D receptor agonist downregulated miR193a, upregulated APOL1 expression, and prevented dedifferentiation of DPDs in HG milieu. These findings suggest that modulation of the APOL1-miR193a axis carries a potential to preserve DPD molecular phenotype in HG milieu.
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Affiliation(s)
- Abheepsa Mishra
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | - Kamesh Ayasolla
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | - Vinod Kumar
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | - Xiqian Lan
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | | | - Rukhsana Aslam
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | - Ali Hussain
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | - Sheetal Chowdhary
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | - Shadafarin Marashi Shoshtari
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | - Nitpriya Paliwal
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | | | - Moin A Saleem
- Academic Renal Unit, University of Bristol , Bristol , United Kingdom
| | - Ashwani Malhotra
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
| | | | - Karl Skorecki
- Technion-Israel Institute of Technology and Rambam Health Care Campus , Haifa , Israel
| | - Pravin C Singhal
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research and Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Great Neck, New York
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27
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Currier RB, Cooper A, Burrell-Saward H, MacLeod A, Alsford S. Decoding the network of Trypanosoma brucei proteins that determines sensitivity to apolipoprotein-L1. PLoS Pathog 2018; 14:e1006855. [PMID: 29346416 PMCID: PMC5790291 DOI: 10.1371/journal.ppat.1006855] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 01/30/2018] [Accepted: 01/05/2018] [Indexed: 12/27/2022] Open
Abstract
In contrast to Trypanosoma brucei gambiense and T. b. rhodesiense (the causative agents of human African trypanosomiasis), T. b. brucei is lysed by apolipoprotein-L1 (apoL1)-containing human serum trypanolytic factors (TLF), rendering it non-infectious to humans. While the mechanisms of TLF1 uptake, apoL1 membrane integration, and T. b. gambiense and T. b. rhodesiense apoL1-resistance have been extensively characterised, our understanding of the range of factors that drive apoL1 action in T. b. brucei is limited. Selecting our bloodstream-form T. b. brucei RNAi library with recombinant apoL1 identified an array of factors that supports the trypanocidal action of apoL1, including six putative ubiquitin modifiers and several proteins putatively involved in membrane trafficking; we also identified the known apoL1 sensitivity determinants, TbKIFC1 and the V-ATPase. Most prominent amongst the novel apoL1 sensitivity determinants was a putative ubiquitin ligase. Intriguingly, while loss of this ubiquitin ligase reduces parasite sensitivity to apoL1, its loss enhances parasite sensitivity to TLF1-dominated normal human serum, indicating that free and TLF1-bound apoL1 have contrasting modes-of-action. Indeed, loss of the known human serum sensitivity determinants, p67 (lysosomal associated membrane protein) and the cathepsin-L regulator, 'inhibitor of cysteine peptidase', had no effect on sensitivity to free apoL1. Our findings highlight a complex network of proteins that influences apoL1 action, with implications for our understanding of the anti-trypanosomal action of human serum.
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Affiliation(s)
- Rachel B. Currier
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Anneli Cooper
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, United Kingdom
| | | | - Annette MacLeod
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, United Kingdom
| | - Sam Alsford
- London School of Hygiene and Tropical Medicine, London, United Kingdom
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Zhang X, Hong XK, Li SJ, Lai DH, Hide G, Lun ZR, Wen YZ. The effect of normal human serum on the mouse trypanosome Trypanosoma musculi in vitro and in vivo. Exp Parasitol 2017; 184:115-120. [PMID: 29246831 DOI: 10.1016/j.exppara.2017.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 11/07/2017] [Accepted: 12/11/2017] [Indexed: 12/12/2022]
Abstract
Trypanosoma musculi, a common blood flagellate found in mice, is similar in morphology and life cycle to the rat trypanosome T. lewisi. Both species belong to the subgenus Herpetosoma, and as T. lewisi has recently been shown to be a zoonotic pathogen, there is concern that T. musculi could also be potentially infective to humans. To test this hypothesis, a well-established method, the normal human serum (NHS) incubation test, was carried out which distinguishes human and non-human infective trypanosomes. We found that T. musculi could grow in 0.31% NHS in vitro, and even kept their infectivity to mice after incubation with 10% NHS for 24 h. In in vivo experiments, T. musculi were only slightly affected by NHS injection, confirming that it was less sensitive to the NHS than T. b. brucei, but more sensitive than T. lewisi. This resistance probably does not rely on a restricted uptake of ApoL-1. Due to this partial resistance, we cannot definitively confirm that T. musculi has the potential for infection to humans. As resistance is less than that of T. lewisi, our data suggest that it is unlikely to be a zoonotic pathogen although we would advise caution in the case of immunocompromised people such as AIDS and cancer patients.
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Affiliation(s)
- Xuan Zhang
- Center for Parasitic Organisms, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Xiao-Kun Hong
- Center for Parasitic Organisms, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Su-Jin Li
- Center for Parasitic Organisms, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - De-Hua Lai
- Center for Parasitic Organisms, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Geoff Hide
- Ecosystems and Environment Research Centre and Biomedical Research Centre, School of Environment and Life Sciences, University of Salford, Salford M5 4WT, UK
| | - Zhao-Rong Lun
- Center for Parasitic Organisms, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China; Ecosystems and Environment Research Centre and Biomedical Research Centre, School of Environment and Life Sciences, University of Salford, Salford M5 4WT, UK.
| | - Yan-Zi Wen
- Center for Parasitic Organisms, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China.
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Abstract
PURPOSE OF REVIEW Chronic kidney disease (CKD) is a common disease with an estimated prevalence of 10-12%. There are pronounced differences between ethnicities with a 3-fold to 4-fold higher lifetime risk for end-stage kidney disease in African Americans compared to European Americans. The purpose of this review was to discuss recent findings on two apolipoproteins (apolipoprotein L1 and A-IV) in the context of kidney disease and kidney function. RECENT FINDINGS The observation that certain apolipoprotein L1 risk genotypes that are only present in African Americans might explain a major fraction of the ethnic differences for nondiabetic CKD has set the stage for this otherwise under-researched apolipoprotein. These risk genotypes on the one hand protect African Americans against African sleeping sickness but cause on the other hand several types of nondiabetic CKD. We are currently beginning to understand the mechanisms how apolipoprotein L1 is involved in the modification of lysosomal and cytoplasmic membranes. The second protein, apolipoprotein A-IV (apoA-IV), turned out to be an early marker of kidney impairment not only in patients with primary CKD but also in individuals from the general population. Genetic studies provided strong support of a causal effect of kidney function on apoA-IV concentrations. SUMMARY These two apolipoproteins have very distinct properties. Apolipoprotein L1 is causally involved in the development of nondiabetic CKD in African Americans. In contrast, apoA-IV is an early marker for kidney impairment.
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Affiliation(s)
- Florian Kronenberg
- Division of Genetic Epidemiology, Department of Medical Genetics, Molecular and Clinical Pharmacology, Medical University of Innsbruck, Schöpfstr. 41, 6020 Innsbruck, Austria
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