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Cho H, Lai CC, Bonnavion R, Alnouri MW, Wang S, Roquid KA, Kawase H, Campos D, Chen M, Weinstein LS, Martínez A, Looso M, Sanda M, Offermanns S. Endothelial insulin resistance induced by adrenomedullin mediates obesity-associated diabetes. Science 2025; 387:674-682. [PMID: 39913566 DOI: 10.1126/science.adr4731] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2024] [Accepted: 12/17/2024] [Indexed: 04/23/2025]
Abstract
Insulin resistance is a hallmark of obesity-associated type 2 diabetes. Insulin's actions go beyond metabolic cells and also involve blood vessels, where insulin increases capillary blood flow and delivery of insulin and nutrients. We show that adrenomedullin, whose plasma levels are increased in obese humans and mice, inhibited insulin signaling in human endothelial cells through protein-tyrosine phosphatase 1B-mediated dephosphorylation of the insulin receptor. In obese mice lacking the endothelial adrenomedullin receptor, insulin-induced endothelial nitric oxide-synthase activation and skeletal muscle perfusion were increased. Treating mice with adrenomedullin mimicked the effect of obesity and induced endothelial and systemic insulin resistance. Endothelial loss or blockade of the adrenomedullin receptor improved obesity-induced insulin resistance. These findings identify a mechanism underlying obesity-induced systemic insulin resistance and suggest approaches to treat obesity-associated type 2 diabetes.
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MESH Headings
- Adrenomedullin/blood
- Adrenomedullin/pharmacology
- Adrenomedullin/metabolism
- Animals
- Insulin Resistance
- Obesity/complications
- Obesity/metabolism
- Humans
- Diabetes Mellitus, Type 2/etiology
- Diabetes Mellitus, Type 2/metabolism
- Mice
- Receptor, Insulin/metabolism
- Insulin/metabolism
- Muscle, Skeletal/blood supply
- Muscle, Skeletal/metabolism
- Nitric Oxide Synthase Type III/metabolism
- Protein Tyrosine Phosphatase, Non-Receptor Type 1/metabolism
- Receptors, Adrenomedullin/metabolism
- Receptors, Adrenomedullin/genetics
- Receptors, Adrenomedullin/antagonists & inhibitors
- Signal Transduction
- Male
- Endothelial Cells/metabolism
- Phosphorylation
- Mice, Inbred C57BL
- Endothelium, Vascular/metabolism
- Mice, Obese
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Affiliation(s)
- Haaglim Cho
- Max Planck Institute for Heart and Lung Research, Department of Pharmacology, Bad Nauheim, Germany
| | - Chien-Cheng Lai
- Max Planck Institute for Heart and Lung Research, Department of Pharmacology, Bad Nauheim, Germany
| | - Rémy Bonnavion
- Max Planck Institute for Heart and Lung Research, Department of Pharmacology, Bad Nauheim, Germany
| | - Mohamad Wessam Alnouri
- Max Planck Institute for Heart and Lung Research, Department of Pharmacology, Bad Nauheim, Germany
| | - ShengPeng Wang
- Department of Cardiovascular Medicine, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Kenneth Anthony Roquid
- Max Planck Institute for Heart and Lung Research, Department of Pharmacology, Bad Nauheim, Germany
| | - Haruya Kawase
- Max Planck Institute for Heart and Lung Research, Department of Pharmacology, Bad Nauheim, Germany
| | - Diana Campos
- Max Planck Institute for Heart and Lung Research, Biomolecular Mass Spectrometry, Bad Nauheim, Germany
| | - Min Chen
- Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Lee S Weinstein
- Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Alfredo Martínez
- Oncology Area, Center for Biomedical Research of La Rioja (CIBIR), Logroño, Spain
| | - Mario Looso
- Max Planck Institute for Heart and Lung Research, Bioinformatics, Bad Nauheim, Germany
- Cardiopulmonary Institute (CPI), Bad Nauheim, Germany
| | - Miloslav Sanda
- Max Planck Institute for Heart and Lung Research, Biomolecular Mass Spectrometry, Bad Nauheim, Germany
| | - Stefan Offermanns
- Max Planck Institute for Heart and Lung Research, Department of Pharmacology, Bad Nauheim, Germany
- Department of Cardiovascular Medicine, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
- Cardiopulmonary Institute (CPI), Bad Nauheim, Germany
- Center for Molecular Medicine, Goethe University Frankfurt, Frankfurt, Germany
- German Center for Cardiovascular Research (DZHK), partner site Frankfurt/Rhine-Main, Bad Nauheim, Germany
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2
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Honda S, Misawa N, Sato Y, Oikawa D, Tokunaga F. The hypothetical molecular mechanism of the ethnic variations in the manifestation of age-related macular degeneration; focuses on the functions of the most significant susceptibility genes. Graefes Arch Clin Exp Ophthalmol 2024; 262:2799-2811. [PMID: 38507046 DOI: 10.1007/s00417-024-06442-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 02/27/2024] [Accepted: 03/08/2024] [Indexed: 03/22/2024] Open
Abstract
Age-related macular degeneration (AMD) is the leading sight-threatening disease in developed countries. On the other hand, recent studies indicated an ethnic variation in the phenotype of AMD. For example, several reports demonstrated that the incidence of drusen in AMD patients is less in Asians compared to Caucasians though the reason has not been clarified yet. In the last decades, several genome association studies have disclosed many susceptible genes of AMD and revealed that the association strength of some genes was different among races and AMD phenotypes. In this review article, the essential findings of the clinical studies and genome association studies for the most significant genes CFH and ARMS2/HTRA1 in AMD of different races are summarized, and theoretical hypotheses about the molecular mechanisms underlying the ethnic variation in the AMD manifestation mainly focused on those genes between Caucasians and Asians are discussed.
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Affiliation(s)
- Shigeru Honda
- Department of Ophthalmology and Visual Sciences, Osaka Metropolitan University Graduate School of Medicine, 1-4-3 Asahi-Machi, Abeno-Ku, Osaka, Japan.
| | - Norihiko Misawa
- Department of Ophthalmology and Visual Sciences, Osaka Metropolitan University Graduate School of Medicine, 1-4-3 Asahi-Machi, Abeno-Ku, Osaka, Japan
| | - Yusuke Sato
- Center for Research On Green Sustainable Chemistry, Graduate School of Engineering, Tottori University, Tottori, Japan
- Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, Tottori, Japan
| | - Daisuke Oikawa
- Department of Medical Biochemistry, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Fuminori Tokunaga
- Department of Medical Biochemistry, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
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3
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Fenner BJ, Li H, Gan ATL, Song YS, Tham YC, Jonas JB, Wang YX, Cheng CY, Wong TY, Teo KYC, Tan ACS, Fan Q, Cheung CMG. Genetic Variability of Complement Factor H Has Ethnicity-Specific Associations With Choroidal Thickness. Invest Ophthalmol Vis Sci 2023; 64:10. [PMID: 36749597 PMCID: PMC9919691 DOI: 10.1167/iovs.64.2.10] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Purpose To identify genetic alleles associated with differences in choroidal thickness (CT) in a population-based multiethnic Asian cohort. Methods A population-based multiethnic Asian cohort without retinal pathology was subjected to spectral-domain OCT (SD-OCT) and genotyping of risk alleles in CFH, VIPR2, ARMS2, and CETP. Subfoveal choroidal thickness (SFCT) values were assessed from SD-OCT, and associations with the risk alleles were determined for each cohort. Results A total of 1045 healthy Asian individuals (550 Chinese, 147 Indians, 348 Malays) were prospectively enrolled in the study. Several CFH alleles (rs800292, rs1061170, and rs1329428) were associated with increased SFCT in Indians (+18.7 to +31.7 µm; P = 0.001-0.038) and marginally associated with decreased SFCT in Malays (-12.7 to -20.6 µm; P = 0.014-0.022). Haplotype analysis of CFH revealed variable associations with SFCT among races, with the H6 haplotype being associated with a 29.08-µm reduction in SFCT in the Chinese cohort (P = 0.02) but a 35.2-µm increase in SFCT in the Indian cohort (P < 0.001). Finally, subfield analysis of the Chinese cohort identified associations between the CFH risk allele rs1061170 and reduced CT in the nasal and superior sectors (-20.2 to -25.8 µm; P = 0.003-0.027). Conclusions CFH variants are variably associated with CT among Asian ethnic groups. This has broad implications for the pathogenesis of common diseases such as age-related macular degeneration and central serous choroidopathy, the pathogenesis of which is associated with CT.
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Affiliation(s)
- Beau J Fenner
- Singapore National Eye Centre, Singapore.,Singapore Eye Research Institute, Singapore
| | | | | | - Young Seok Song
- Singapore Eye Research Institute, Singapore.,Department of Ophthalmology, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Yih Chung Tham
- Singapore Eye Research Institute, Singapore.,Centre for Innovation & Precision Eye Health, Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore
| | - Jost B Jonas
- Institute of Molecular and Clinical Ophthalmology, Basel, Switzerland
| | - Ya Xing Wang
- Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Ching Yu Cheng
- Singapore Eye Research Institute, Singapore.,Centre for Innovation & Precision Eye Health, Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore
| | - Tien Yin Wong
- School of Medicine, Tsinghua University, Beijing, China
| | - Kelvin Y C Teo
- Singapore National Eye Centre, Singapore.,Singapore Eye Research Institute, Singapore
| | - Anna C S Tan
- Singapore National Eye Centre, Singapore.,Singapore Eye Research Institute, Singapore
| | - Qiao Fan
- Singapore Eye Research Institute, Singapore.,Center for Quantitative Medicine, Duke-NUS Graduate Medical School, Singapore
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4
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Peñalver Penedo R, Rupérez Lucas M, Álvarez-Sala Walther LA, Torregrosa Benavent A, Casas Losada ML, Bañuelos Andrio L, Rebolledo Poves AB, Bueno Campaña M. MR-Proadrenomedullin as biomarker of renal damage in urinary tract infection in children. BMC Pediatr 2021; 21:292. [PMID: 34187408 PMCID: PMC8240321 DOI: 10.1186/s12887-021-02765-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 06/02/2021] [Indexed: 01/18/2023] Open
Abstract
Background Midregional-proadrenomedullin (MR-proADM) is a useful prognostic peptide in severe infectious pathologies in the adult population. However, there are no studies that analyze its utility in febrile urinary tract infection (fUTI) in children. An accurate biomarker would provide an early detection of patients with kidney damage, avoiding other invasive tests like renal scintigraphy scans. Our objective is to study the usefulness of MR-proADM as a biomarker of acute and chronic renal parenchymal damage in fUTI within the pediatric population. Methods A prospective cohort study was conducted in pediatric patients with fUTI between January 2015 and December 2018. Plasma and urine MR-proADM levels were measured at admission in addition to other laboratory parameters. After confirmation of fUTI, renal scintigraphy scans were performed during the acute and follow-up stages. A descriptive study has been carried out and sensitivity, specificity and ROC curves for MR-proADM, C-reactive protein, and procalcitonin were calculated. Results 62 pediatric patients (34 female) were enrolled. Scintigraphy showed acute pyelonephritis in 35 patients (56.5%). Of those patients, the median of plasmatic MR-proADM (P-MR-proADM) showed no differences compared to patients without pyelonephritis. 7 patients (11.3%) developed renal scars (RS). Their median P-MR-proADM levels were 1.07 nmol/L (IQR 0.66–1.59), while in patients without RS were 0.48 nmol/L (0.43–0.63) (p < 0.01). The AUC in this case was 0.92 (95% CI 0.77–0.99). We established an optimal cut-off point at 0.66 nmol/L with sensitivity 83.3% and specificity 81.8%. Conclusion MR-ProADM has demonstrated a poor ability to diagnose pyelonephritis in pediatric patients with fUTI. However, P-MR-proADM proved to be a very reliable biomarker for RS prediction. Supplementary Information The online version contains supplementary material available at 10.1186/s12887-021-02765-2.
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Affiliation(s)
- Rafael Peñalver Penedo
- Servicio de Pediatría, Hospital Santa Bárbara de Soria, Departamento de Medicina, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain.
| | - Marta Rupérez Lucas
- Servicio de Pediatría, Hospital Universitario Fundación Alcorcón, Madrid, Spain
| | - Luis Antonio Álvarez-Sala Walther
- Departamento de Medicina, Facultad de Medicina, Servicio de Medicina Interna, Hospital General Universitario Gregorio Marañón, IiSGM, Instituto de Investigaciones Sanitarias Gregorio Marañón, Universidad Complutense de Madrid, Madrid, Spain
| | | | | | - Luis Bañuelos Andrio
- Servicio de Medicina Nuclear, Hospital Universitario Fundación Alcorcón, Madrid, Spain
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5
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Moore SR, Menon SS, Cortes C, Ferreira VP. Hijacking Factor H for Complement Immune Evasion. Front Immunol 2021; 12:602277. [PMID: 33717083 PMCID: PMC7947212 DOI: 10.3389/fimmu.2021.602277] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 01/15/2021] [Indexed: 12/15/2022] Open
Abstract
The complement system is an essential player in innate and adaptive immunity. It consists of three pathways (alternative, classical, and lectin) that initiate either spontaneously (alternative) or in response to danger (all pathways). Complement leads to numerous outcomes detrimental to invaders, including direct killing by formation of the pore-forming membrane attack complex, recruitment of immune cells to sites of invasion, facilitation of phagocytosis, and enhancement of cellular immune responses. Pathogens must overcome the complement system to survive in the host. A common strategy used by pathogens to evade complement is hijacking host complement regulators. Complement regulators prevent attack of host cells and include a collection of membrane-bound and fluid phase proteins. Factor H (FH), a fluid phase complement regulatory protein, controls the alternative pathway (AP) both in the fluid phase of the human body and on cell surfaces. In order to prevent complement activation and amplification on host cells and tissues, FH recognizes host cell-specific polyanionic markers in combination with complement C3 fragments. FH suppresses AP complement-mediated attack by accelerating decay of convertases and by helping to inactivate C3 fragments on host cells. Pathogens, most of which do not have polyanionic markers, are not recognized by FH. Numerous pathogens, including certain bacteria, viruses, protozoa, helminths, and fungi, can recruit FH to protect themselves against host-mediated complement attack, using either specific receptors and/or molecular mimicry to appear more like a host cell. This review will explore pathogen complement evasion mechanisms involving FH recruitment with an emphasis on: (a) characterizing the structural properties and expression patterns of pathogen FH binding proteins, as well as other strategies used by pathogens to capture FH; (b) classifying domains of FH important in pathogen interaction; and (c) discussing existing and potential treatment strategies that target FH interactions with pathogens. Overall, many pathogens use FH to avoid complement attack and appreciating the commonalities across these diverse microorganisms deepens the understanding of complement in microbiology.
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Affiliation(s)
- Sara R Moore
- Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, OH, United States
| | - Smrithi S Menon
- Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, OH, United States
| | - Claudio Cortes
- Department of Foundational Medical Sciences, Oakland University William Beaumont School of Medicine, Rochester, MI, United States
| | - Viviana P Ferreira
- Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, OH, United States
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6
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Kaye R, Chandra S, Sheth J, Boon CJF, Sivaprasad S, Lotery A. Central serous chorioretinopathy: An update on risk factors, pathophysiology and imaging modalities. Prog Retin Eye Res 2020; 79:100865. [PMID: 32407978 DOI: 10.1016/j.preteyeres.2020.100865] [Citation(s) in RCA: 145] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/02/2020] [Accepted: 04/27/2020] [Indexed: 02/08/2023]
Abstract
Central serous chorioretinopathy (CSC) is a common form of vision loss, typically seen in working-age men. The pathophysiology behind CSC still eludes us, however significant advances have been made in understanding this disease over the last decade using information from genetic and cell-based studies and imaging modalities. This review aims to give an overview of the current pathophysiology hypotheses surrounding CSC in addition to future directions in cellular work from human induced pluripotent stem cell derived choroidal endothelial cells from CSC patients. Furthermore, this review will provide the reader with an update on the clinical aspects of CSC including risk factors, diagnostic challenges and findings from multimodal imaging.
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Affiliation(s)
- Rebecca Kaye
- Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, SO16 6YD, United Kingdom
| | - Shruti Chandra
- NIHR Moorfields Biomedical Research Centre, 162, City Road, London, EC1V 2PD, United Kingdom
| | - Jay Sheth
- Surya Eye Institute and Research Center, Mumbai, India
| | - Camiel J F Boon
- Leiden University Medical Centre, Department of Ophthalmology, P.O. Box 9600, 2300 RC, Leiden, the Netherlands; Amsterdam University Medical Centers, Department of Ophthalmology, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Sobha Sivaprasad
- NIHR Moorfields Biomedical Research Centre, 162, City Road, London, EC1V 2PD, United Kingdom
| | - Andrew Lotery
- Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, SO16 6YD, United Kingdom.
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Abstract
Sepsis remains a major scientific and medical challenge, for which, apart from significant refinements in supportive therapy, treatment has barely changed over the last few decades. During sepsis, both vascular tone and vascular integrity are compromised, and contribute to the development of shock. The free circulating peptide adrenomedullin (ADM) is involved in the regulation of the endothelial barrier function and tone of blood vessels. Several animal studies have shown that ADM administration improves outcome of sepsis. However, in higher dosages, ADM administration may cause hypotension, limiting its clinical applicability. Moreover, ADM has a very short half-life and easily adheres to surfaces, further hampering its clinical use. The non-neutralizing anti-ADM antibody Adrecizumab (HAM8101) which causes a long-lasting increase of plasma ADM has shown promising results in animal models of systemic inflammation and sepsis; it reduced inflammation, attenuated vascular leakage, and improved hemodynamics, kidney function, and survival. Combined with an excellent safety profile derived from animal and phase I human studies, Adrecizumab represents a promising candidate drug for the adjunctive treatment of sepsis. In this review, we first provide a brief overview of the currently available data on the role of adrenomedullin in sepsis and describe its effects on endothelial barrier function and vasodilation. Furthermore, we provide a novel hypothesis concerning the mechanisms of action through which Adrecizumab may exert its beneficial effects in sepsis.
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Miki A, Sakurada Y, Tanaka K, Semba K, Mitamura Y, Yuzawa M, Tajima A, Nakatochi M, Yamamoto K, Matsuo K, Imoto I, Honda S. Genome-Wide Association Study to Identify a New Susceptibility Locus for Central Serous Chorioretinopathy in the Japanese Population. ACTA ACUST UNITED AC 2018; 59:5542-5547. [DOI: 10.1167/iovs.18-25497] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Akiko Miki
- Department of Surgery, Division of Ophthalmology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Yoichi Sakurada
- Department of Ophthalmology, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Koji Tanaka
- Department of Ophthalmology, Nihon University School of Medicine, Tokyo, Japan
| | - Kentaro Semba
- Department of Ophthalmology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
| | - Yoshinori Mitamura
- Department of Ophthalmology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
| | - Mitsuko Yuzawa
- Department of Ophthalmology, Nihon University School of Medicine, Tokyo, Japan
| | - Atsushi Tajima
- Department of Bioinformatics and Genomics, Graduate School of Advanced Preventive Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Masahiro Nakatochi
- Statistical Analysis Section, Center for Advanced Medicine and Clinical Research, Nagoya University Hospital, Nagoya, Japan
| | - Ken Yamamoto
- Department of Medical Biochemistry, Kurume University School of Medicine, Kurume, Japan
| | - Keitaro Matsuo
- Division of Molecular and Clinical Epidemiology, Aichi Cancer Center Research Institute, Nagoya, Japan
- Division of Epidemiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Issei Imoto
- Division of Molecular Genetics, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Shigeru Honda
- Department of Surgery, Division of Ophthalmology, Kobe University Graduate School of Medicine, Kobe, Japan
- Department of Ophthalmology and Visual Sciences, Osaka City University Graduate School of Medicine, Osaka, Japan
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9
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Castellano G, Divella C, Sallustio F, Montinaro V, Curci C, Zanichelli A, Bonanni E, Suffritti C, Caccia S, Bossi F, Gallone A, Schena FP, Gesualdo L, Cicardi M. A transcriptomics study of hereditary angioedema attacks. J Allergy Clin Immunol 2018; 142:883-891. [PMID: 29729940 DOI: 10.1016/j.jaci.2018.03.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 02/20/2018] [Accepted: 03/28/2018] [Indexed: 01/21/2023]
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10
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Geven C, Kox M, Pickkers P. Adrenomedullin and Adrenomedullin-Targeted Therapy As Treatment Strategies Relevant for Sepsis. Front Immunol 2018; 9:292. [PMID: 29520277 PMCID: PMC5827550 DOI: 10.3389/fimmu.2018.00292] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 02/01/2018] [Indexed: 12/29/2022] Open
Abstract
Sepsis remains a major medical challenge, for which, apart from improvements in supportive care, treatment has not relevantly changed over the last few decades. Vasodilation and vascular leakage play a pivotal role in the development of septic shock, with vascular leakage being caused by disrupted endothelial integrity. Adrenomedullin (ADM), a free circulating peptide involved in regulation of endothelial barrier function and vascular tone, is implicated in the pathophysiology of sepsis. ADM levels are increased during sepsis, and correlate with extent of vasodilation, as well as with disease severity and mortality. In vitro and preclinical in vivo data show that administration of ADM exerts anti-inflammatory, antimicrobial, and protective effects on endothelial barrier function during sepsis, but other work suggests that it may also decrease blood pressure, which could be detrimental for patients with septic shock. Work has been carried out to negate ADMs putative negative effects, while preserving or even potentiating its beneficial actions. Preclinical studies have demonstrated that the use of antibodies that bind to the N-terminus of ADM results in an overall increase of circulating ADM levels and improves sepsis outcome. Similar beneficial effects were obtained using coadministration of ADM and ADM-binding protein-1. It is hypothesized that the mechanism behind the beneficial effects of ADM binding involves prolongation of its half-life and a shift of ADM from the interstitium to the circulation. This in turn results in increased ADM activity in the blood compartment, where it exerts beneficial endothelial barrier-stabilizing effects, whereas its detrimental vasodilatory effects in the interstitium are reduced. Up till now, in vivo data on ADM-targeted treatments in humans are lacking; however, the first study in septic patients with an N-terminus antibody (Adrecizumab) is currently being conducted.
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Affiliation(s)
- Christopher Geven
- Department of Intensive Care Medicine, Radboud University Medical Center, Nijmegen, Netherlands
- Radboud Center for Infectious Diseases (RCI), Radboud University Medical Center, Nijmegen, Netherlands
| | - Matthijs Kox
- Department of Intensive Care Medicine, Radboud University Medical Center, Nijmegen, Netherlands
- Radboud Center for Infectious Diseases (RCI), Radboud University Medical Center, Nijmegen, Netherlands
| | - Peter Pickkers
- Department of Intensive Care Medicine, Radboud University Medical Center, Nijmegen, Netherlands
- Radboud Center for Infectious Diseases (RCI), Radboud University Medical Center, Nijmegen, Netherlands
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11
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Schönauer R, Els-Heindl S, Beck-Sickinger AG. Adrenomedullin - new perspectives of a potent peptide hormone. J Pept Sci 2017; 23:472-485. [DOI: 10.1002/psc.2953] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 11/24/2016] [Accepted: 11/28/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Ria Schönauer
- Faculty of Biosciences, Pharmacy and Psychology, Institute of Biochemistry; Leipzig University; Brüderstraße 34 04103 Leipzig Germany
| | - Sylvia Els-Heindl
- Faculty of Biosciences, Pharmacy and Psychology, Institute of Biochemistry; Leipzig University; Brüderstraße 34 04103 Leipzig Germany
| | - Annette G. Beck-Sickinger
- Faculty of Biosciences, Pharmacy and Psychology, Institute of Biochemistry; Leipzig University; Brüderstraße 34 04103 Leipzig Germany
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12
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Parente R, Clark SJ, Inforzato A, Day AJ. Complement factor H in host defense and immune evasion. Cell Mol Life Sci 2016; 74:1605-1624. [PMID: 27942748 PMCID: PMC5378756 DOI: 10.1007/s00018-016-2418-4] [Citation(s) in RCA: 136] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/08/2016] [Accepted: 11/09/2016] [Indexed: 12/30/2022]
Abstract
Complement is the major humoral component of the innate immune system. It recognizes pathogen- and damage-associated molecular patterns, and initiates the immune response in coordination with innate and adaptive immunity. When activated, the complement system unleashes powerful cytotoxic and inflammatory mechanisms, and thus its tight control is crucial to prevent damage to host tissues and allow restoration of immune homeostasis. Factor H is the major soluble inhibitor of complement, where its binding to self markers (i.e., particular glycan structures) prevents complement activation and amplification on host surfaces. Not surprisingly, mutations and polymorphisms that affect recognition of self by factor H are associated with diseases of complement dysregulation, such as age-related macular degeneration and atypical haemolytic uremic syndrome. In addition, pathogens (i.e., non-self) and cancer cells (i.e., altered-self) can hijack factor H to evade the immune response. Here we review recent (and not so recent) literature on the structure and function of factor H, including the emerging roles of this protein in the pathophysiology of infectious diseases and cancer.
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Affiliation(s)
- Raffaella Parente
- Humanitas Clinical and Research Center, Via Manzoni 56, Rozzano, 20089, Milan, Italy
| | - Simon J Clark
- Division of Evolution and Genomic Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Antonio Inforzato
- Humanitas Clinical and Research Center, Via Manzoni 56, Rozzano, 20089, Milan, Italy. .,Department of Medical Biotechnologies and Translational Medicine, University of Milan, Via Vanvitelli 32, 20129, Milan, Italy.
| | - Anthony J Day
- Wellcome Trust Centre for Cell-Matrix Research, Division of Cell-Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Oxford Road, Manchester, M13 9PT, UK.
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13
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Abstract
The complement system is reemerging in the last few years not only as key element of innate immunity against pathogens, but also as a main regulator of local adaptive responses, affecting dendritic cells as well as T and B lymphocytes. We review data showing that leucocytes are capable of significant autocrine synthesis of complement proteins, and express a large range of complement receptors, which in turn regulate their differentiation and effector functions while cross talking with other innate receptors such as Toll-like receptors. Other unconventional roles of complement proteins are reviewed, including their impact in non-leukocytes and their intracellular cleavage by vesicular proteases, which generate critical cues required for T cell function. Thus, leucocytes are very much aware of complement-derived information, both extracellular and intracellular, to elaborate their responses, offering rich avenues for therapeutic intervention and new hypothesis for conserved major histocompatibility complex complotypes.
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Abstract
PURPOSE Central serous chorioretinopathy (CSC) is a common choroidal disorder which often affects the vision of young adults. Although the molecular mechanisms associated with CSC remain unknown, correlations between steroid hormone use and CSC have been suspected. We investigated the choroidal status of CSC secondary to corticosteroid use. METHODS The records of 25 eyes of 25 consecutive acute CSC cases secondary to corticosteroid use were reviewed retrospectively. Central choroidal thickness was measured by optical coherent tomography. Choroidal vessel dilation and choroidal vascular hyperpermeability were evaluated based on indocyanine green angiography findings. The parameters related to secondary CSC were compared with those of 25 eyes of 25 cases with acute idiopathic CSC. RESULTS The mean central choroidal thickness of secondary CSC was 294.8 ± 95.0 μm, which was significantly thinner than that of idiopathic CSC (409.4 ± 124.7 μm, P = 0.00064). The proportion of the cases exhibiting choroidal vessel dilation was not significantly different between secondary CSC (52%) and idiopathic CSC (64%). The proportion of cases showing choroidal vascular hyperpermeability was significantly smaller in secondary CSC (62%) than idiopathic CSC (92%) (P = 0.028). CONCLUSION The choroidal status in the acute phase of secondary CSC after corticosteroid use might be different from that of idiopathic CSC, which suggests a complex mechanism for CSC.
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DiScipio RG, Liddington RC, Schraufstatter IU. Fibulin-1 purification from human plasma using affinity chromatography on Factor H-Sepharose. Protein Expr Purif 2016; 121:118-24. [PMID: 26826315 DOI: 10.1016/j.pep.2016.01.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 01/22/2016] [Indexed: 10/22/2022]
Abstract
A method is reported to purify Fibulin-1 from human plasma resulting in a 36% recovery. The steps involve removal of the cryoglobulin and the vitamin K dependent proteins followed by polyethylene glycol and ammonium sulfate precipitations, DEAE-Sephadex column chromatography and finally Factor H-Sepharose affinity purification. The procedure is designed to be integrated into an overall scheme for the isolation of over 30 plasma proteins from a single batch of human plasma. Results from mass spectroscopy, SDS-PAGE, and Western blotting indicate that human plasma Fibulin-1 is a single chain of the largest isotype. Functional binding assays demonstrated calcium ion dependent interaction of Fibulin-1 for fibrinogen, fibronectin, and Factor H. The procedure described is the first to our knowledge that enables a large scale purification of Fibulin-1 from human plasma.
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Affiliation(s)
- Richard G DiScipio
- Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, CA 92121, United States.
| | - Robert C Liddington
- Sanford-Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines RD La Jolla, CA 92037, United States
| | - Ingrid U Schraufstatter
- Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, CA 92121, United States
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