201
|
Özsaygili C, Küçük B, Yildirim Y. The effect of posterior vitreous detachment on aflibercept response in diabetic macular oedema. Br J Ophthalmol 2020; 105:800-805. [PMID: 32727727 DOI: 10.1136/bjophthalmol-2020-316155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/23/2020] [Indexed: 01/12/2023]
Abstract
PURPOSE To investigate the effect of posterior vitreous detachment (PVD) on aflibercept response in treatment-naïve diabetic macular oedema (DME). DESIGN A retrospective cohort study. METHODS One hundred and fifty eyes of 150 treatment-naïve patients with DME were enrolled. The patients were divided into three groups according to their PVD status: group 1 (no PVD during injections), group 2 (PVD during injections) and group 3 (PVD already present initially). Three consecutive aflibercept injections at intervals of 1 month were applied to all patients. The efficacy of the aflibercept treatment on DME was assessed by comparing changes in central retinal thickness (CRT) and best-corrected visual acuity (BCVA) values after three loading dose injections. RESULTS After three consecutive injections, the mean reduction of CRT in groups 1, 2 and 3 were -199.6±106.9, -224.9±124.1 and -210.7±126.3, respectively. The decrease in CRT was significant in all groups (p<0.001 in all groups, paired-samples t-test); however, mean changes in CRT were similar among groups (all p>0.05, one-way analysis of variance (ANOVA)). The mean improvement in BCVA in groups 1, 2 and 3 was 6.6±0.9, 6.5±0.8 and 6.1±0.4 ETDRS letters, respectively. The improvement of BCVA was significant in all groups (p<0.001 in all groups, paired-samples t-test) and mean changes were similar between groups (p>0.05, one-way ANOVA). There was no significant relationship between the presence or development of PVD and the mean decrease of CRT and improvement of BCVA (for CRT r=-0.052, p=0.531 and for BCVA r=-0.078, p=0.342). CONCLUSION In the present study, it was observed that the efficacy of aflibercept treatment in patients with DME did not depend on PVD status.
Collapse
Affiliation(s)
- Cemal Özsaygili
- Kayseri City Training and Research Hospital, Kayseri, Turkey
| | - Bekir Küçük
- Kayseri City Training and Research Hospital, Kayseri, Turkey
| | - Yener Yildirim
- Kayseri City Training and Research Hospital, Kayseri, Turkey
| |
Collapse
|
202
|
Jones FJS, Smith JR, Ayub N, Herman ST, Buchhalter JR, Fureman BE, Cash SS, Hoch DB, Moura LMVR. Implementing standardized provider documentation in a tertiary epilepsy clinic. Neurology 2020; 95:e213-e223. [PMID: 32546650 PMCID: PMC7455323 DOI: 10.1212/wnl.0000000000009778] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/17/2019] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To incorporate standardized documentation into an epilepsy clinic and to use these standardized data to compare patients' perception of epilepsy diagnosis to provider documentation. METHODS Using quality improvement methodology, we implemented interventions to increase documentation of epilepsy diagnosis, seizure frequency, and type from 49.8% to 70% of adult nonemployee patients seen by 6 providers over 5 months of routine clinical care. The main intervention consisted of an interactive SmartPhrase that mirrored a documentation template developed by the Epilepsy Learning Healthcare System. We assessed the weekly proportion of complete SmartPhrases among eligible patient encounters with a statistical process control chart. We used a subset of patients with established epilepsy care linked to existing patient-reported survey data to examine the proportion of patient-to-provider agreement on epilepsy diagnosis (yes vs no/unsure). We also examined sociodemographic and clinical characteristics of patients who disagreed vs agreed with provider's documentation of epilepsy diagnosis. RESULTS The median SmartPhrase weekly completion rate was 78%. Established patients disagreed with providers with respect to epilepsy diagnosis in 18.5% of encounters (κ = 0.13), indicating that they did not have or were unsure if they had epilepsy despite having a provider-documented epilepsy diagnosis. Patients who disagreed with providers were similar to those who agreed with respect to age, sex, ethnicity, marital status, seizure frequency, type, and other quality-of-life measures. CONCLUSION This project supports the feasibility of implementing standardized documentation of data relevant to epilepsy care in a tertiary epilepsy clinic and highlights an opportunity for improvement in patient-provider communication.
Collapse
Affiliation(s)
- Felipe J S Jones
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD.
| | - Jason R Smith
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| | - Neishay Ayub
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| | - Susan T Herman
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| | - Jeffrey R Buchhalter
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| | - Brandy E Fureman
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| | - Sydney S Cash
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| | - Daniel B Hoch
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| | - Lidia M V R Moura
- From the Department of Neurology (F.J.S.J., J.R.S., N.A., S.S.C., D.B.H., L.M.V.R.M.), Massachusetts General Hospital, Harvard Medical School; Department of Neurology (S.T.H.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA; Department of Pediatrics (J.R.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; and Research and New Therapies (B.E.F.), Epilepsy Foundation, Landover, MD
| |
Collapse
|
203
|
Ghorbani M, Brooks BR, Klauda JB. Critical Sequence Hot-spots for Binding of nCOV-2019 to ACE2 as Evaluated by Molecular Simulations. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2020. [PMID: 32637962 DOI: 10.1101/2020.06.27.175448] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The novel coronavirus (nCOV-2019) outbreak has put the world on edge, causing millions of cases and hundreds of thousands of deaths all around the world, as of June 2020, let alone the societal and economic impacts of the crisis. The spike protein of nCOV-2019 resides on the virion's surface mediating coronavirus entry into host cells by binding its receptor binding domain (RBD) to the host cell surface receptor protein, angiotensin converter enzyme (ACE2). Our goal is to provide a detailed structural mechanism of how nCOV-2019 recognizes and establishes contacts with ACE2 and its difference with an earlier coronavirus SARS-COV in 2002 via extensive molecular dynamics (MD) simulations. Numerous mutations have been identified in the RBD of nCOV-2019 strains isolated from humans in different parts of the world. In this study, we investigated the effect of these mutations as well as other Ala-scanning mutations on the stability of RBD/ACE2 complex. It is found that most of the naturally-occurring mutations to the RBD either strengthen or have the same binding affinity to ACE2 as the wild-type nCOV-2019. This may have implications for high human-to-human transmission of coronavirus in regions where these mutations have been found as well as any vaccine design endeavors since these mutations could act as antibody escape mutants. Furthermore, in-silico Ala-scanning and long-timescale MD simulations, highlight the crucial role of the residues at the interface of RBD and ACE2 that may be used as potential pharmacophores for any drug development endeavors. From an evolutional perspective, this study also identifies how the virus has evolved from its predecessor SARS-COV and how it could further evolve to become more infectious.
Collapse
|
204
|
Willem L, Van Hoang T, Funk S, Coletti P, Beutels P, Hens N. SOCRATES: an online tool leveraging a social contact data sharing initiative to assess mitigation strategies for COVID-19. BMC Res Notes 2020. [PMID: 32546245 DOI: 10.1101/2020.03.03.20030627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023] Open
Abstract
OBJECTIVE Establishing a social contact data sharing initiative and an interactive tool to assess mitigation strategies for COVID-19. RESULTS We organized data sharing of published social contact surveys via online repositories and formatting guidelines. We analyzed this social contact data in terms of weighted social contact matrices, next generation matrices, relative incidence and R[Formula: see text]. We incorporated location-specific physical distancing measures (e.g. school closure or at work) and capture their effect on transmission dynamics. All methods have been implemented in an online application based on R Shiny and applied to COVID-19 with age-specific susceptibility and infectiousness. Using our online tool with the available social contact data, we illustrate that physical distancing could have a considerable impact on reducing transmission for COVID-19. The effect itself depends on assumptions made about disease-specific characteristics and the choice of intervention(s).
Collapse
Affiliation(s)
- Lander Willem
- Centre for Health Economic Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium.
| | - Thang Van Hoang
- Interuniversity Institute of Biostatistics and Statistical Bioinformatics, Data Science Institute, Hasselt University, Hasselt, Belgium
| | - Sebastian Funk
- Centre for the Mathematical Modelling of Infectious Diseases, London School of Hygiene & Tropical Medicine, London, UK
| | - Pietro Coletti
- Interuniversity Institute of Biostatistics and Statistical Bioinformatics, Data Science Institute, Hasselt University, Hasselt, Belgium
| | - Philippe Beutels
- Centre for Health Economic Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium
- School of Public Health and Community Medicine, University of New South Wales, Sydney, Australia
| | - Niel Hens
- Centre for Health Economic Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium
- Interuniversity Institute of Biostatistics and Statistical Bioinformatics, Data Science Institute, Hasselt University, Hasselt, Belgium
| |
Collapse
|
205
|
Perdikari TM, Murthy AC, Ryan VH, Watters S, Naik MT, Fawzi NL. SARS-CoV-2 nucleocapsid protein undergoes liquid-liquid phase separation stimulated by RNA and partitions into phases of human ribonucleoproteins. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2020:2020.06.09.141101. [PMID: 32577653 PMCID: PMC7302208 DOI: 10.1101/2020.06.09.141101] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Tightly packed complexes of nucleocapsid protein and genomic RNA form the core of viruses and may assemble within viral factories, dynamic compartments formed within the host cells. Here, we examine the possibility that the multivalent RNA-binding nucleocapsid protein (N) from the severe acute respiratory syndrome coronavirus (SARS-CoV-2) compacts RNA via protein-RNA liquid-liquid phase separation (LLPS) and that N interactions with host RNA-binding proteins are mediated by phase separation. To this end, we created a construct expressing recombinant N fused to a N-terminal maltose binding protein tag which helps keep the oligomeric N soluble for purification. Using in vitro phase separation assays, we find that N is assembly-prone and phase separates avidly. Phase separation is modulated by addition of RNA and changes in pH and is disfavored at high concentrations of salt. Furthermore, N enters into in vitro phase separated condensates of full-length human hnRNPs (TDP-43, FUS, and hnRNPA2) and their low complexity domains (LCs). However, N partitioning into the LC of FUS, but not TDP-43 or hnRNPA2, requires cleavage of the solubilizing MBP fusion. Hence, LLPS may be an essential mechanism used for SARS-CoV-2 and other RNA viral genome packing and host protein co-opting, functions necessary for viral replication and hence infectivity.
Collapse
Affiliation(s)
| | - Anastasia C Murthy
- Molecular Biology, Cell Biology & Biochemistry Graduate Program, Brown University, Providence, RI, USA
| | - Veronica H Ryan
- Neuroscience Graduate Program, Brown University, Providence, RI, USA
| | - Scott Watters
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI, USA
| | - Mandar T Naik
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI, USA
| | - Nicolas L Fawzi
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI, USA
- Robert J. and Nancy D. Carney Institute for Brain Science, Brown University, Providence, RI, USA
| |
Collapse
|
206
|
Ye Q, West AM, Silletti S, Corbett KD. Architecture and self-assembly of the SARS-CoV-2 nucleocapsid protein. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2020:2020.05.17.100685. [PMID: 32511359 PMCID: PMC7263487 DOI: 10.1101/2020.05.17.100685] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The COVID-2019 pandemic is the most severe acute public health threat of the twenty-first century. To properly address this crisis with both robust testing and novel treatments, we require a deep understanding of the life cycle of the causative agent, the SARS-CoV-2 coronavirus. Here, we examine the architecture and self-assembly properties of the SARS-CoV-2 nucleocapsid protein, which packages viral RNA into new virions. We determined a 1.4 Å resolution crystal structure of this protein's N2b domain, revealing a compact, intertwined dimer similar to that of related coronaviruses including SARS-CoV. While the N2b domain forms a dimer in solution, addition of the C-terminal spacer B/N3 domain mediates formation of a homotetramer. Using hydrogen-deuterium exchange mass spectrometry, we find evidence that at least part of this putatively disordered domain is structured, potentially forming an α-helix that self-associates and cooperates with the N2b domain to mediate tetramer formation. Finally, we map the locations of amino acid substitutions in the N protein from over 38,000 SARS-CoV-2 genome sequences. We find that these substitutions are strongly clustered in the protein's N2a linker domain, and that substitutions within the N1b and N2b domains cluster away from their functional RNA binding and dimerization interfaces. Overall, this work reveals the architecture and self-assembly properties of a key protein in the SARS-CoV-2 life cycle, with implications for both drug design and antibody-based testing.
Collapse
Affiliation(s)
- Qiaozhen Ye
- Department of Cellular & Molecular Medicine, University of California San Diego, La Jolla, CA
| | - Alan M.V. West
- Department of Cellular & Molecular Medicine, University of California San Diego, La Jolla, CA
| | - Steve Silletti
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA
| | - Kevin D. Corbett
- Department of Cellular & Molecular Medicine, University of California San Diego, La Jolla, CA
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA
- Ludwig Institute for Cancer Research, San Diego Branch, La Jolla, CA
| |
Collapse
|
207
|
Abstract
PURPOSE OF REVIEW Bone elongation is a complex process driven by multiple intrinsic (hormones, growth factors) and extrinsic (nutrition, environment) variables. Bones grow in length by endochondral ossification in cartilaginous growth plates at ends of developing long bones. This review provides an updated overview of the important factors that influence this process. RECENT FINDINGS Insulin-like growth factor-1 (IGF-1) is the major hormone required for growth and a drug for treating pediatric skeletal disorders. Temperature is an underrecognized environmental variable that also impacts linear growth. This paper reviews the current state of knowledge regarding the interaction of IGF-1 and environmental factors on bone elongation. Understanding how internal and external variables regulate bone lengthening is essential for developing and improving treatments for an array of bone elongation disorders. Future studies may benefit from understanding how these unique relationships could offer realistic new approaches for increasing bone length in different growth-limiting conditions.
Collapse
Affiliation(s)
- Holly L Racine
- Department of Natural Sciences and Mathematics, West Liberty University, West Liberty, WV, 26074, USA
| | - Maria A Serrat
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, 1 John Marshall Drive, Huntington, WV, 25755, USA.
- Department of Clinical and Translational Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, 25755, USA.
- Department of Orthopaedics, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, 25755, USA.
| |
Collapse
|
208
|
Ding R, Zhang L, He P, Song X, Zheng X. Income, income inequality and schizophrenia in China: a population-based multilevel analysis. J Epidemiol Community Health 2020; 74:719-725. [PMID: 32434862 DOI: 10.1136/jech-2019-213049] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 04/14/2020] [Accepted: 04/21/2020] [Indexed: 11/04/2022]
Abstract
BACKGROUND Previous studies have suggested that socio-environmental factors interact with genetic risk in the genesis of schizophrenia. This study aimed to investigate the relationship between income, income inequality and schizophrenia and its heterogeneity among different geographic scales and subgroups. METHODS We used data from the Second China National Sample Survey on Disability (2006). The sample consisted of 1 909 205 participants aged 18 years or older. Individuals who were suspected to be psychiatrically disabled were administered the WHO Disability Assessment Schedule, Version II and the International Statistical Classification of Diseases, Tenth Revision Symptom Checklist for Mental Disorders by trained clinical psychiatrists to diagnose schizophrenia. Gross household income per capita was used to calculate the Gini coefficient to measure income inequality. Multilevel logistic regression with cross-level interaction was applied to examine the association of income, income inequality and schizophrenia. RESULTS A total of 7 628 persons (0.40%) were identified as having schizophrenia. Income was independently associated with schizophrenia. At the province level, greater income inequality was significantly associated with a higher risk of schizophrenia (OR, 1.03; 95% CI 1.00 to 1.06), and no significant association was observed at the county level. The analysis with cross-level interaction showed that the association at the province level was most pronounced in the highest income quartile (OR, 1.02; 95% CI 1.00 to 1.03). CONCLUSION The significant association between income and schizophrenia was consistent with the absolute income hypothesis. The adverse effect of income inequality on the risk of schizophrenia starts to operate at a larger area level, and it is more pronounced for the affluent population in China. This finding further supports the relative income hypothesis and social causation pathway for schizophrenia and calls attention to the vulnerability of high-income groups.
Collapse
Affiliation(s)
- Ruoxi Ding
- Institute of Population Research, Peking University, Beijing, China
| | - Lei Zhang
- Institute of Population Research, Peking University, Beijing, China
| | - Ping He
- China Center for Health Development Studies, Peking University, Beijing, China
| | - Xinming Song
- Institute of Population Research, Peking University, Beijing, China
| | - Xiaoying Zheng
- Institute of Population Research, Peking University, Beijing, China
| |
Collapse
|
209
|
Ulisse V, Dey S, Rothbard DE, Zeevi E, Gokhman I, Dadosh T, Minis A, Yaron A. Regulation of axonal morphogenesis by the mitochondrial protein Efhd1. Life Sci Alliance 2020; 3:3/7/e202000753. [PMID: 32414840 PMCID: PMC7232985 DOI: 10.26508/lsa.202000753] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 05/04/2020] [Accepted: 05/05/2020] [Indexed: 12/12/2022] Open
Abstract
During development, neurons adjust their energy balance to meet the high demands of robust axonal growth and branching. The mechanisms that regulate this tuning are largely unknown. Here, we show that sensory neurons lacking liver kinase B1 (Lkb1), a master regulator of energy homeostasis, exhibit impaired axonal growth and branching. Biochemical analysis of these neurons revealed reduction in axonal ATP levels, whereas transcriptome analysis uncovered down-regulation of Efhd1 (EF-hand domain family member D1), a mitochondrial Ca2+-binding protein. Genetic ablation of Efhd1 in mice resulted in reduced axonal morphogenesis as well as enhanced neuronal death. Strikingly, this ablation causes mitochondrial dysfunction and a decrease in axonal ATP levels. Moreover, Efhd1 KO sensory neurons display shortened mitochondria at the axonal growth cones, activation of the AMP-activated protein kinase (AMPK)-Ulk (Unc-51-like autophagy-activating kinase 1) pathway and an increase in autophagic flux. Overall, this work uncovers a new mitochondrial regulator that is required for axonal morphogenesis.
Collapse
Affiliation(s)
- Valeria Ulisse
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Swagata Dey
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Deborah E Rothbard
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Einav Zeevi
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Irena Gokhman
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Tali Dadosh
- Department of Chemical Research Support, Faculty of Chemistry, The Weizmann Institute of Science, Rehovot, Israel
| | - Adi Minis
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Avraham Yaron
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| |
Collapse
|
210
|
Shimizu Y, Nakamura K, Yoshii A, Yokoi Y, Kikuchi M, Shinozaki R, Nakamura S, Ohira S, Sugimoto R, Ayabe T. Paneth cell α-defensin misfolding correlates with dysbiosis and ileitis in Crohn's disease model mice. Life Sci Alliance 2020; 3:3/6/e201900592. [PMID: 32345659 PMCID: PMC7190275 DOI: 10.26508/lsa.201900592] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 04/07/2020] [Accepted: 04/07/2020] [Indexed: 12/12/2022] Open
Abstract
This study provides novel insight into Crohn’s disease where α-defensin misfolding resulting from excessive ER stress in Paneth cells induces dysbiosis and disease progression. Crohn’s disease (CD) is an intractable inflammatory bowel disease, and dysbiosis, disruption of the intestinal microbiota, is associated with CD pathophysiology. ER stress, disruption of ER homeostasis in Paneth cells of the small intestine, and α-defensin misfolding have been reported in CD patients. Because α-defensins regulate the composition of the intestinal microbiota, their misfolding may cause dysbiosis. However, whether ER stress, α-defensin misfolding, and dysbiosis contribute to the pathophysiology of CD remains unknown. Here, we show that abnormal Paneth cells with markers of ER stress appear in SAMP1/YitFc, a mouse model of CD, along with disease progression. Those mice secrete reduced-form α-defensins that lack disulfide bonds into the intestinal lumen, a condition not found in normal mice, and reduced-form α-defensins correlate with dysbiosis during disease progression. Moreover, administration of reduced-form α-defensins to wild-type mice induces the dysbiosis. These data provide novel insights into CD pathogenesis induced by dysbiosis resulting from Paneth cell α-defensin misfolding and they suggest further that Paneth cells may be potential therapeutic targets.
Collapse
Affiliation(s)
- Yu Shimizu
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan.,Department of Cell Biological Science, Faculty of Advanced Life Science, Hokkaido University, Hokkaido, Japan
| | - Kiminori Nakamura
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan.,Department of Cell Biological Science, Faculty of Advanced Life Science, Hokkaido University, Hokkaido, Japan
| | - Aki Yoshii
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan
| | - Yuki Yokoi
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan.,Department of Cell Biological Science, Faculty of Advanced Life Science, Hokkaido University, Hokkaido, Japan
| | - Mani Kikuchi
- Department of Cell Biological Science, Faculty of Advanced Life Science, Hokkaido University, Hokkaido, Japan
| | - Ryuga Shinozaki
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan
| | - Shunta Nakamura
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan
| | - Shuya Ohira
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan
| | - Rina Sugimoto
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan
| | - Tokiyoshi Ayabe
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Hokkaido, Japan .,Department of Cell Biological Science, Faculty of Advanced Life Science, Hokkaido University, Hokkaido, Japan
| |
Collapse
|
211
|
Invernizzi R, Barnett J, Rawal B, Nair A, Ghai P, Kingston S, Chua F, Wu Z, Wells AU, Renzoni ER, Nicholson AG, Rice A, Lloyd CM, Byrne AJ, Maher TM, Devaraj A, Molyneaux PL. Bacterial burden in the lower airways predicts disease progression in idiopathic pulmonary fibrosis and is independent of radiological disease extent. Eur Respir J 2020; 55:1901519. [PMID: 31980496 PMCID: PMC7136009 DOI: 10.1183/13993003.01519-2019] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 12/29/2019] [Indexed: 12/01/2022]
Abstract
Increasing bacterial burden in the lower airways of patients with idiopathic pulmonary fibrosis confers an increased risk of disease progression and mortality. However, it remains unclear whether this increased bacterial burden directly influences progression of fibrosis or simply reflects the magnitude of the underlying disease extent or severity.We prospectively recruited 193 patients who underwent bronchoscopy and received a multidisciplinary diagnosis of idiopathic pulmonary fibrosis. Quantification of the total bacterial burden in bronchoalveolar lavage fluid was performed by 16S rRNA gene qPCR. Imaging was independently evaluated by two readers assigning quantitative scores for extent, severity and topography of radiographic changes and relationship of these features with bacterial burden was assessed.Increased bacterial burden significantly associated with disease progression (HR 2.1; 95% CI 1.287-3.474; p=0.0028). Multivariate stepwise regression demonstrated no relationship between bacterial burden and radiological features or extent of disease. When specifically considering patients with definite or probable usual interstitial pneumonia there was no difference in bacterial burden between these two groups. Despite a postulated association between pleuroparenchymal fibroelastosis and clinical infection, there was no relationship between either the presence or extent of pleuroparenchymal fibroelastosis and bacterial burden.We demonstrate that bacterial burden in the lower airways is not simply secondary to the extent of the underlying architectural destruction of the lung parenchyma seen in idiopathic pulmonary fibrosis. The independent nature of this association supports a relationship with the underlying pathogenic mechanisms and highlights the urgent need for functional studies.
Collapse
Affiliation(s)
- Rachele Invernizzi
- National Heart and Lung Institute, Imperial College London, London, UK
- Contributed equally as first authors
| | - Joseph Barnett
- National Heart and Lung Institute, Imperial College London, London, UK
- Royal Brompton Hospital, London, UK
- Contributed equally as first authors
| | | | - Arjun Nair
- Dept of Radiology, University College Hospital, London, UK
| | - Poonam Ghai
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Shaun Kingston
- National Heart and Lung Institute, Imperial College London, London, UK
| | | | - Zhe Wu
- National Heart and Lung Institute, Imperial College London, London, UK
- Royal Brompton Hospital, London, UK
| | | | | | - Andrew G Nicholson
- National Heart and Lung Institute, Imperial College London, London, UK
- Royal Brompton Hospital, London, UK
| | | | - Clare M Lloyd
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Adam J Byrne
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Toby M Maher
- National Heart and Lung Institute, Imperial College London, London, UK
- Royal Brompton Hospital, London, UK
| | - Anand Devaraj
- National Heart and Lung Institute, Imperial College London, London, UK
- Royal Brompton Hospital, London, UK
| | - Philip L Molyneaux
- National Heart and Lung Institute, Imperial College London, London, UK
- Royal Brompton Hospital, London, UK
| |
Collapse
|
212
|
Oufiero CE. Evolutionary diversification in the raptorial forelegs of Mantodea: Relations to body size and depth perception. J Morphol 2020; 281:513-522. [PMID: 32220116 DOI: 10.1002/jmor.21118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 03/02/2020] [Accepted: 03/14/2020] [Indexed: 11/10/2022]
Abstract
Limb proportions have evolved among animals to meet functional demands among diverse environments. Studies from terrestrial, vertebrate locomotion have demonstrated that variation in limb proportions have adaptively evolved so animals can perform in a given environment. Most of the research on limb proportion evolution is among vertebrates and terrestrial locomotion, with little information on limb segment evolution in invertebrates or for other functional roles. For example, among invertebrates, multisegmented raptorial forelimbs have evolved multiple times independently to capture prey, but there is little information on the adaptive evolution and diversity of these limbs. Furthermore, as feeding performance is influenced by the sensory system, few studies have examined the coevolution of sensory-motor systems. Using mantises (Mantodea) I examined forelimb diversification among 97 species with a combination of methods, including ternary plots for morphospace visualization, phylogenetically informed allometric relationships, and comparison of evolutionary rates of diversification. Furthermore, using head width as a proxy for depth perception, I examined the correlated evolution of foreleg diversity with depth perception. The results show that among the three segments of the foreleg, the tibia is the smallest, most diverse, and has the highest rate of evolution after body size corrections. Furthermore, while all foreleg segments were related to head width, head width explained the most variation in tibial length compared with other foreleg segments. The results suggest a potential adaptive functional role of tibia length related to the displacement or force produced in this mechanical lever. Furthermore, results from this study support distinct ecomorphs of mantises, as several independent evolutions to grass mimicry evolve similar morphologies. RESEARCH HIGHLIGHT: This study demonstrates interspecific variation among segments of an invertebrate raptorial foreleg. Among Mantodea species the tibia is the most diverse and is related to a proxy for depth perception, while the other segments had strong relationships with body size. This suggests an adaptive, functional role of the tibia during prey capture.
Collapse
|
213
|
Cohen MS. Interplay between compartmentalized NAD + synthesis and consumption: a focus on the PARP family. Genes Dev 2020; 34:254-262. [PMID: 32029457 PMCID: PMC7050480 DOI: 10.1101/gad.335109.119] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Nicotinamide adenine dinucleotide (NAD+) is an essential cofactor for redox enzymes, but also moonlights as a substrate for signaling enzymes. When used as a substrate by signaling enzymes, it is consumed, necessitating the recycling of NAD+ consumption products (i.e., nicotinamide) via a salvage pathway in order to maintain NAD+ homeostasis. A major family of NAD+ consumers in mammalian cells are poly-ADP-ribose-polymerases (PARPs). PARPs comprise a family of 17 enzymes in humans, 16 of which catalyze the transfer of ADP-ribose from NAD+ to macromolecular targets (namely, proteins, but also DNA and RNA). Because PARPs and the NAD+ biosynthetic enzymes are subcellularly localized, an emerging concept is that the activity of PARPs and other NAD+ consumers are regulated in a compartmentalized manner. In this review, I discuss NAD+ metabolism, how different subcellular pools of NAD+ are established and regulated, and how free NAD+ levels can control signaling by PARPs and redox metabolism.
Collapse
Affiliation(s)
- Michael S Cohen
- Department of Chemical Physiology and Biochemistry, Oregon Health and Science University, Portland, Oregon 97210, USA
| |
Collapse
|
214
|
Patkee PA, Baburamani AA, Kyriakopoulou V, Davidson A, Avini E, Dimitrova R, Allsop J, Hughes E, Kangas J, McAlonan G, Rutherford MA. Early alterations in cortical and cerebellar regional brain growth in Down Syndrome: An in vivo fetal and neonatal MRI assessment. Neuroimage Clin 2020; 25:102139. [PMID: 31887718 DOI: 10.1101/683656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 12/15/2019] [Accepted: 12/21/2019] [Indexed: 05/22/2023]
Abstract
Down Syndrome (DS) is the most frequent genetic cause of intellectual disability with a wide spectrum of neurodevelopmental outcomes. At present, the relationship between structural brain morphology and the spectrum of cognitive phenotypes in DS, is not well understood. This study aimed to quantify the development of the fetal and neonatal brain in DS participants, with and without a congenital cardiac defect compared with a control population using dedicated, optimised and motion-corrected in vivo magnetic resonance imaging (MRI). We detected deviations in development and altered regional brain growth in the fetus with DS from 21 weeks' gestation, when compared to age-matched controls. Reduced cerebellar volume was apparent in the second trimester with significant alteration in cortical growth becoming evident during the third trimester. Developmental abnormalities in the cortex and cerebellum are likely substrates for later neurocognitive impairment, and ongoing studies will allow us to confirm the role of antenatal MRI as an early biomarker for subsequent cognitive ability in DS. In the era of rapidly developing technologies, we believe that the results of this study will assist counselling for prospective parents.
Collapse
Affiliation(s)
- Prachi A Patkee
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom
| | - Ana A Baburamani
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom
| | - Vanessa Kyriakopoulou
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom
| | - Alice Davidson
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom
| | - Elhaam Avini
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom
| | - Ralica Dimitrova
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom; Department of Forensic and Neurodevelopmental Science, Sackler Institute for Translational Neurodevelopment, Institute of Psychiatry, Psychology and Neuroscience, King's College London, SE5 8AB, United Kingdom
| | - Joanna Allsop
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom
| | - Emer Hughes
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom
| | - Johanna Kangas
- Department of Forensic and Neurodevelopmental Science, Sackler Institute for Translational Neurodevelopment, Institute of Psychiatry, Psychology and Neuroscience, King's College London, SE5 8AB, United Kingdom
| | - Grainne McAlonan
- Department of Forensic and Neurodevelopmental Science, Sackler Institute for Translational Neurodevelopment, Institute of Psychiatry, Psychology and Neuroscience, King's College London, SE5 8AB, United Kingdom
| | - Mary A Rutherford
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas's Hospital, London, SE1 7EH, United Kingdom.
| |
Collapse
|
215
|
Her L, Zhu HJ. Carboxylesterase 1 and Precision Pharmacotherapy: Pharmacogenetics and Nongenetic Regulators. Drug Metab Dispos 2019; 48:230-244. [PMID: 31871135 DOI: 10.1124/dmd.119.089680] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 12/16/2019] [Indexed: 12/20/2022] Open
Abstract
Carboxylesterase (CES) 1 is the most abundant drug-metabolizing enzyme in human livers, comprising approximately 1% of the entire liver proteome. CES1 is responsible for 80%-95% of total hydrolytic activity in the liver and plays a crucial role in the metabolism of a wide range of drugs (especially ester-prodrugs), pesticides, environmental pollutants, and endogenous compounds. Expression and activity of CES1 vary markedly among individuals, which is a major contributing factor to interindividual variability in the pharmacokinetics (PK) and pharmacodynamics (PD) of drugs metabolized by CES1. Both genetic and nongenetic factors contribute to CES1 variability. Here, we discuss genetic polymorphisms, including single-nucleotide polymorphisms (SNPs), and copy number variants and nongenetic contributors, such as developmental status, genders, and drug-drug interactions, that could influence CES1 functionality and the PK and PD of CES1 substrates. Currently, the loss-of-function SNP G143E (rs71647871) is the only clinically significant CES1 variant identified to date, and alcohol is the only potent CES1 inhibitor that could alter the therapeutic outcomes of CES1 substrate medications. However, G143E and alcohol can only explain a small portion of the interindividual variability in the CES1 function. A better understanding of the regulation of CES1 expression and activity and identification of biomarkers for CES1 function in vivo could lead to the development of a precision pharmacotherapy strategy to improve the efficacy and safety of many CES1 substrate drugs. SIGNIFICANCE STATEMENT: The clinical relevance of CES1 has been well demonstrated in various clinical trials. Genetic and nongenetic regulators can affect CES1 expression and activity, resulting in the alteration of the metabolism and clinical outcome of CES1 substrate drugs, such as methylphenidate and clopidogrel. Predicting the hepatic CES1 function can provide clinical guidance to optimize pharmacotherapy of numerous medications metabolized by CES1.
Collapse
Affiliation(s)
- Lucy Her
- Department of Clinical Pharmacy, University of Michigan, Ann Arbor, Michigan
| | - Hao-Jie Zhu
- Department of Clinical Pharmacy, University of Michigan, Ann Arbor, Michigan
| |
Collapse
|
216
|
Cavedo E, Lista S, Houot M, Vergallo A, Grothe MJ, Teipel S, Zetterberg H, Blennow K, Habert MO, Potier MC, Dubois B, Hampel H. Plasma tau correlates with basal forebrain atrophy rates in people at risk for Alzheimer disease. Neurology 2019; 94:e30-e41. [DOI: 10.1212/wnl.0000000000008696] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 06/28/2019] [Indexed: 12/17/2022] Open
Abstract
ObjectiveTo investigate whether baseline concentrations of plasma total tau (t-tau) and neurofilament light (NfL) chain proteins are associated with annual percent change (APC) of the basal forebrain cholinergic system (BFCS) in cognitively intact older adults at risk for Alzheimer disease (AD).MethodsThis was a large-scale study of 276 cognitively intact older adults from the monocentric INSIGHT-preAD (Investigation of Alzheimer's Predictors in Subjective Memory Complainers) cohort. Participants underwent baseline assessment of plasma t-tau and NfL concentrations as well as baseline and 24-month follow-up MRI scans. Linear models with and without influential observations (calculated using the Cook distance) were carried out to investigate the effect of plasma NfL and t-tau concentrations, and their interaction effect with β-amyloid status and APOE genotype, on the APC of the whole BFCS and its anterior (Ch1/2) and posterior (Ch4) subdivisions separately.ResultsHigher plasma t-tau concentrations at baseline were associated with higher BFCS rate of atrophy (model without influencers: n = 251, F value = 4.6815; p value = 0.031). Subregional analyses showed similar results for both the APC of the Ch1/2 (model without influencers: n = 256, F value = 3.9535, p corrected = 0.047) and Ch4 BFCS sectors (model without influencers: n = 253, F value = 4.9090, p corrected = 0.047). Baseline NfL, β-amyloid load, and APOE ε4 carrier status did not affect APC of the BFCS.ConclusionIncreased concentrations of baseline plasma t-tau may predict in vivo structural BFCS atrophy progression in older adults at risk for AD, independently of β-amyloid status and APOE genotype.
Collapse
|
217
|
Kelly CJ, Arulkumaran S, Tristão Pereira C, Cordero-Grande L, Hughes EJ, Teixeira RPAG, Steinweg JK, Victor S, Pushparajah K, Hajnal JV, Simpson J, Edwards AD, Rutherford MA, Counsell SJ. Neuroimaging findings in newborns with congenital heart disease prior to surgery: an observational study. Arch Dis Child 2019; 104:1042-1048. [PMID: 31243012 PMCID: PMC6801127 DOI: 10.1136/archdischild-2018-314822] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 04/17/2019] [Accepted: 04/26/2019] [Indexed: 12/20/2022]
Abstract
OBJECTIVES Neurodevelopmental impairment has become the most important comorbidity in infants with congenital heart disease (CHD). We aimed to (1) investigate the burden of brain lesions in infants with CHD prior to surgery and (2) explore clinical factors associated with injury. STUDY DESIGN Prospective observational study. SETTING Single centre UK tertiary neonatal intensive care unit. PATIENTS 70 newborn infants with critical or serious CHD underwent brain MRI prior to surgery. MAIN OUTCOME MEASURES Prevalence of cerebral injury including arterial ischaemic strokes (AIS), white matter injury (WMI) and intracranial haemorrhage. RESULTS Brain lesions were observed in 39% of subjects (95% CI 28% to 50%). WMI was identified in 33% (95% CI 23% to 45%), subdural haemorrhage without mass effect in 33% (95% CI 23% to 45%), cerebellar haemorrhage in 9% (95% CI 4% to 18%) and AIS in 4% (95% CI 1.5% to 12%). WMI was distributed widely throughout the brain, particularly involving the frontal white matter, optic radiations and corona radiata. WMI exhibited restricted diffusion in 48% of cases. AIS was only observed in infants with transposition of the great arteries (TGA) who had previously undergone balloon atrial septostomy (BAS). AIS was identified in 23% (95% CI 8% to 50%) of infants with TGA who underwent BAS, compared with 0% (95% CI 0% to 20%) who did not. CONCLUSIONS Cerebral injury in newborns with CHD prior to surgery is common.
Collapse
Affiliation(s)
- Christopher J Kelly
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Sophie Arulkumaran
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Catarina Tristão Pereira
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Lucilio Cordero-Grande
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Emer J Hughes
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Rui Pedro A G Teixeira
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Johannes K Steinweg
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Suresh Victor
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Kuberan Pushparajah
- School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK,Paediatric Cardiology Department, Evelina London Children’s Healthcare, London, UK
| | - Joseph V Hajnal
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - John Simpson
- Congenital Heart Disease, Evelina London Children’s Hospital, London, London, UK
| | - A David Edwards
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Mary A Rutherford
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| | - Serena J Counsell
- Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, King’s College London, London, UK
| |
Collapse
|
218
|
Hildebrand F, Moitinho-Silva L, Blasche S, Jahn MT, Gossmann TI, Huerta-Cepas J, Hercog R, Luetge M, Bahram M, Pryszlak A, Alves RJ, Waszak SM, Zhu A, Ye L, Costea PI, Aalvink S, Belzer C, Forslund SK, Sunagawa S, Hentschel U, Merten C, Patil KR, Benes V, Bork P. Antibiotics-induced monodominance of a novel gut bacterial order. Gut 2019; 68:1781-1790. [PMID: 30658995 PMCID: PMC6839795 DOI: 10.1136/gutjnl-2018-317715] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 12/17/2018] [Accepted: 12/19/2018] [Indexed: 01/21/2023]
Abstract
OBJECTIVE The composition of the healthy human adult gut microbiome is relatively stable over prolonged periods, and representatives of the most highly abundant and prevalent species have been cultured and described. However, microbial abundances can change on perturbations, such as antibiotics intake, enabling the identification and characterisation of otherwise low abundant species. DESIGN Analysing gut microbial time-series data, we used shotgun metagenomics to create strain level taxonomic and functional profiles. Community dynamics were modelled postintervention with a focus on conditionally rare taxa and previously unknown bacteria. RESULTS In response to a commonly prescribed cephalosporin (ceftriaxone), we observe a strong compositional shift in one subject, in which a previously unknown species, UBorkfalki ceftriaxensis, was identified, blooming to 92% relative abundance. The genome assembly reveals that this species (1) belongs to a so far undescribed order of Firmicutes, (2) is ubiquitously present at low abundances in at least one third of adults, (3) is opportunistically growing, being ecologically similar to typical probiotic species and (4) is stably associated to healthy hosts as determined by single nucleotide variation analysis. It was the first coloniser after the antibiotic intervention that led to a long-lasting microbial community shift and likely permanent loss of nine commensals. CONCLUSION The bloom of UB. ceftriaxensis and a subsequent one of Parabacteroides distasonis demonstrate the existence of monodominance community states in the gut. Our study points to an undiscovered wealth of low abundant but common taxa in the human gut and calls for more highly resolved longitudinal studies, in particular on ecosystem perturbations.
Collapse
Affiliation(s)
- Falk Hildebrand
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Lucas Moitinho-Silva
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Sonja Blasche
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Martin T Jahn
- RD3 Marine Microbiology, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | | | - Jaime Huerta-Cepas
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Computational systems biology and genomics, Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
| | - Rajna Hercog
- Genomics Core Facility, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Mechthild Luetge
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Mohammad Bahram
- Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
- Department of Botany, Institute of Ecology and Earth Sciences, Tartu University, Tartu, Estonia
| | - Anna Pryszlak
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Renato J Alves
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Structural and Computational Biology Unit, Joint PhD degree between EMBL and Heidelberg University, Heidelberg, Germany
| | - Sebastian M Waszak
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Ana Zhu
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Host Microbiota Interactions Laboratory, Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton, UK
| | - Lumeng Ye
- Biotechnology Dept., GenScript Corporation (NanJing), NanJing, China
| | - Paul Igor Costea
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Steven Aalvink
- Institute of Microbiology, Wagenigen University, Wageningen, Netherlands
| | - Clara Belzer
- Institute of Microbiology, Wagenigen University, Wageningen, Netherlands
| | - Sofia K Forslund
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Experimental and ClinicalResearch Centre, Max Delbrück Centre for Molecular Medicine, Berlin, Germany
| | - Shinichi Sunagawa
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Department of Biology, Institute of Microbiology, ETH Zurich, Zurich, Switzerland
| | - Ute Hentschel
- RD3 Marine Microbiology, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Christoph Merten
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Kiran Raosaheb Patil
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Vladimir Benes
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Peer Bork
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Molecular Medicine Partnership Unit (MMPU), University of Heidelberg and European Molecular Biology Laboratory, Heidelberg, Germany
- Department of Bioinformatics, University of Würzburg, Würzburg, Germany
| |
Collapse
|
219
|
Nemetchek B, Khowaja A, Kavuma A, Kabajaasi O, Olirus Owilli A, Ansermino JM, Fowler-Kerry S, Jacob ST, Kenya-Mugisha N, Kabakyenga J, Wiens MO. Exploring healthcare providers' perspectives of the paediatric discharge process in Uganda: a qualitative exploratory study. BMJ Open 2019; 9:e029526. [PMID: 31494611 PMCID: PMC6731949 DOI: 10.1136/bmjopen-2019-029526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
INTRODUCTION The burden of childhood mortality continues to be born largely by low-income and middle-income countries. The critical postdischarge period has been largely neglected despite evidence that mortality rates during this period can exceed inpatient mortality rates. However, there is a paucity of data on the paediatric discharge process from the perspective of the healthcare provider. Provider perspectives may be important in the development of an improved understanding of the barriers and facilitators to improving the transition from hospital to home. OBJECTIVES To explore healthcare providers' and facility administrators' perspectives of the paediatric discharge process with respect to: (1) current procedures, (2) barriers and challenges, (3) ideas for change, (4) facilitators for change and (5) the importance of discharge planning. DESIGN A qualitative exploratory approach using focus groups (14) and in-depth interviews (7). SETTING This study was conducted at seven hospitals providing paediatric care in Uganda. RESULTS Current discharge procedures are largely based on hospital-specific protocols or clinician opinion, as opposed to national guidelines. Some key barriers to an improved discharge process included caregiver resources and education, critical communication gaps, traditional practices, and a lack of human and physical resources. Teamwork and motivation to see improved paediatric transitions to home were identified as facilitators to implementing the ideas for change proposed by participants. The need for a standardised national policy guiding paediatric discharges, implemented through education at many levels and coupled with appropriate community referral and follow-up, was broadly perceived as essential to improving outcomes for children. CONCLUSIONS Although significant challenges and gaps were identified within the current health system, participants' ideas and the identified facilitators provide a significant basis from which change may occur. This work can facilitate the development of sustainable and effective interventions to improve postdischarge outcomes in Uganda and other similar settings.
Collapse
Affiliation(s)
- Brooklyn Nemetchek
- College of Nursing, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Asif Khowaja
- School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
| | | | | | - Alex Olirus Owilli
- College of Nursing, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - J Mark Ansermino
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada
- Center for International Child Health, BC Children's Hospital, Vancouver, British Columbia, Canada
| | - Susan Fowler-Kerry
- College of Nursing, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Shevin T Jacob
- Walimu, Mbarara, Uganda
- Department of Clinical Services, Liverpool School of Tropical Medicine, Liverpool, UK
| | | | - Jerome Kabakyenga
- Maternal, Newborn, and Child Health Institute, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Matthew O Wiens
- Center for International Child Health, BC Children's Hospital, Vancouver, British Columbia, Canada
- Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| |
Collapse
|
220
|
Kurata I, Matsumoto I, Ohyama A, Osada A, Ebe H, Kawaguchi H, Kaneko S, Kondo Y, Tsuboi H, Tomioka A, Kaji H, Sumida T. Potential involvement of OX40 in the regulation of autoantibody sialylation in arthritis. Ann Rheum Dis 2019; 78:1488-1496. [PMID: 31300460 DOI: 10.1136/annrheumdis-2019-215195] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 06/18/2019] [Accepted: 07/03/2019] [Indexed: 01/29/2023]
Abstract
OBJECTIVE An increased proportion of circulating follicular helper T (Tfh) cells was reported in rheumatoid arthritis (RA), but it remains uncertain how Tfh cells affect antibody hyposialylation. We investigated the regulation of autoantibody hyposialylation by Tfh cells in RA using murine model. METHODS Behaviours of Tfh cells and their function on B cell promotion were analysed. Change of arthritogenicity and sialylation of autoantibodies during the course of arthritis was examined by mass spectrometry. Tfh-mediated regulation of hyposialylation was investigated, and the responsible cell surface molecule was specified both in vitro and in vivo. The relation between circulating Tfh cells and hyposialylation was analysed in patients with RA. RESULTS An increase in Tfh, particularly interleukin-17 producing Tfh (Tfh17) cells, at the onset of arthritis and their enhancement of autoantibody production were found. Autoantibodies at the onset phase demonstrated stronger inflammatory properties than those at the resolution phase, and mass spectrometric analysis revealed their difference in sialylation. In vitro coculture showed enhanced hyposialylation by the Tfh cells via OX40, which was highly expressed in the Tfh and Tfh17 cells. Blockade of OX40 prevented the development of arthritis with reduction in Tfh17 cells and recovery of autoantibody sialylation. Analysis of patients with RA showed abundance of OX40-overexpressing Tfh17 cells, and their proportion correlated negatively with the expression of α2,6-sialyltransferase 1, an enzyme responsible for sialylation. CONCLUSIONS OX40 expressed on Tfh cells can regulate autoantibody sialylation and play a crucial role in the development of autoimmune arthritis.
Collapse
Affiliation(s)
- Izumi Kurata
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Isao Matsumoto
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Ayako Ohyama
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Atsumu Osada
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hiroshi Ebe
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hoshimi Kawaguchi
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Shunta Kaneko
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Yuya Kondo
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hiroto Tsuboi
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Azusa Tomioka
- Glycoscience and Glycotechnology Research Group, Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Hiroyuki Kaji
- Glycoscience and Glycotechnology Research Group, Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Takayuki Sumida
- Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| |
Collapse
|
221
|
Doroudian M, MacLoughlin R, Poynton F, Prina-Mello A, Donnelly SC. Nanotechnology based therapeutics for lung disease. Thorax 2019; 74:965-976. [PMID: 31285360 DOI: 10.1136/thoraxjnl-2019-213037] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 05/06/2019] [Accepted: 05/13/2019] [Indexed: 11/03/2022]
Abstract
Nanomedicine is a multidisciplinary research field with an integration of traditional sciences such as chemistry, physics, biology and materials science. The application of nanomedicine for lung diseases as a relatively new area of interdisciplinary science has grown rapidly over the last 10 years. Promising research outcomes suggest that nanomedicine will revolutionise the practice of medicine, through the development of new approaches in therapeutic agent delivery, vaccine development and nanotechnology-based medical detections. Nano-based approaches in the diagnosis and treatment of lung diseases will, in the not too distant future, change the way we practise medicine. This review will focus on the current trends and developments in the clinical translation of nanomedicine for lung diseases, such as in the areas of lung cancer, cystic fibrosis, asthma, bacterial infections and COPD.
Collapse
Affiliation(s)
- Mohammad Doroudian
- Department of Medicine, Tallaght University Hospital, Dublin 24 & Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Ronan MacLoughlin
- Aerogen, IDA Business Park, Galway, Ireland.,School of Pharmacy, Royal College of Surgeons, Dublin, Ireland.,School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin, Ireland
| | - Fergus Poynton
- Department of Medicine, Tallaght University Hospital, Dublin 24 & Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Adriele Prina-Mello
- CRANN Institute and AMBER Centre, University of Dublin Trinity College, Dublin, Ireland.,Department of Medicine, Laboratory for Biological Characterization of Advanced Materials (LBCAM), Trinity College Dublin, Dublin, Ireland.,Nanomedicine Group, Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland
| | - Seamas C Donnelly
- Department of Medicine, Tallaght University Hospital, Dublin 24 & Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| |
Collapse
|
222
|
Verbruggen SW, Kainz B, Shelmerdine SC, Hajnal JV, Rutherford MA, Arthurs OJ, Phillips ATM, Nowlan NC. Stresses and strains on the human fetal skeleton during development. J R Soc Interface 2019; 15:rsif.2017.0593. [PMID: 29367236 PMCID: PMC5805961 DOI: 10.1098/rsif.2017.0593] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 12/18/2017] [Indexed: 01/11/2023] Open
Abstract
Mechanical forces generated by fetal kicks and movements result in stimulation of the fetal skeleton in the form of stress and strain. This stimulation is known to be critical for prenatal musculoskeletal development; indeed, abnormal or absent movements have been implicated in multiple congenital disorders. However, the mechanical stress and strain experienced by the developing human skeleton in utero have never before been characterized. Here, we quantify the biomechanics of fetal movements during the second half of gestation by modelling fetal movements captured using novel cine-magnetic resonance imaging technology. By tracking these movements, quantifying fetal kick and muscle forces, and applying them to three-dimensional geometries of the fetal skeleton, we test the hypothesis that stress and strain change over ontogeny. We find that fetal kick force increases significantly from 20 to 30 weeks' gestation, before decreasing towards term. However, stress and strain in the fetal skeleton rises significantly over the latter half of gestation. This increasing trend with gestational age is important because changes in fetal movement patterns in late pregnancy have been linked to poor fetal outcomes and musculoskeletal malformations. This research represents the first quantification of kick force and mechanical stress and strain due to fetal movements in the human skeleton in utero, thus advancing our understanding of the biomechanical environment of the uterus. Further, by revealing a potential link between fetal biomechanics and skeletal malformations, our work will stimulate future research in tissue engineering and mechanobiology.
Collapse
Affiliation(s)
| | - Bernhard Kainz
- Department of Computing, Imperial College London, London, UK
| | | | - Joseph V Hajnal
- Department of Biomedical Engineering & Centre for the Developing Brain, School of Biomedical Engineering and Imaging Science, Kings College London, London, UK
| | - Mary A Rutherford
- Department of Perinatal Imaging and Health & Centre for the Developing Brain, School of Biomedical Engineering and Imaging Science, Kings College London, London, UK
| | - Owen J Arthurs
- UCL Great Ormond Street Institute of Child Health, London, UK
| | - Andrew T M Phillips
- Department of Civil and Environmental Engineering, Imperial College London, London, UK
| | - Niamh C Nowlan
- Department of Bioengineering, Imperial College London, London, UK
| |
Collapse
|
223
|
Friedl L, Claxton AG, Walker CS, Churchill SE, Holliday TW, Hawks J, Berger LR, DeSilva JM, Marchi D. Femoral neck and shaft structure in Homo naledi from the Dinaledi Chamber (Rising Star System, South Africa). J Hum Evol 2019; 133:61-77. [PMID: 31358184 DOI: 10.1016/j.jhevol.2019.06.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 01/27/2023]
Abstract
The abundant femoral assemblage of Homo naledi found in the Dinaledi Chamber provides a unique opportunity to test hypotheses regarding the taxonomy, locomotion, and loading patterns of this species. Here we describe neck and shaft cross-sectional structure of all the femoral fossils recovered in the Dinaledi Chamber and compare them to a broad sample of fossil hominins, recent humans, and extant apes. Cross-sectional geometric (CSG) properties from the femoral neck (base of neck and midneck) and diaphysis (subtrochanteric region and midshaft) were obtained through CT scans for H. naledi and through CT scans or from the literature for the comparative sample. The comparison of CSG properties of H. naledi and the comparative samples shows that H. naledi femoral neck is quite derived with low superoinferior cortical thickness ratio and high relative cortical area. The neck appears superoinferiorly elongated because of two bony pilasters on its superior surface. Homo naledi femoral shaft shows a relatively thick cortex compared to the other hominins. The subtrochanteric region of the diaphysis is mediolaterally elongated resembling early hominins while the midshaft is anteroposteriorly elongated, indicating high mobility levels. In term of diaphyseal robusticity, the H. naledi femur is more gracile that other hominins and most apes. Homo naledi shows a unique combination of characteristics in its femur that undoubtedly indicate a species committed to terrestrial bipedalism but with a unique loading pattern of the femur possibly consequence of the unique postcranial anatomy of the species.
Collapse
Affiliation(s)
- Lukas Friedl
- Department of Anthropology, University of West Bohemia, Plzeň, Czech Republic
| | - Alex G Claxton
- Department of Anthropology, Dartmouth College, 409 Silsby, HB 6047, Hanover, USA
| | - Christopher S Walker
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, 1060 William Moore Drive, Raleigh, NC, 27607, USA; Evolutionary Studies Institute and Centre for Excellence in PalaeoSciences, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa; Department of Evolutionary Anthropology, Duke University, 04 Bio Sci Bldg, Durham, NC, 27708, USA
| | - Steven E Churchill
- Department of Evolutionary Anthropology, Duke University, 04 Bio Sci Bldg, Durham, NC, 27708, USA; Evolutionary Studies Institute and Centre for Excellence in PalaeoSciences, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa
| | - Trenton W Holliday
- Department of Anthropology, Tulane University, 417 Dinwiddie Hall, New Orleans, LA, 70118, USA; Evolutionary Studies Institute and Centre for Excellence in PalaeoSciences, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa
| | - John Hawks
- Department of Anthropology, University of Wisconsin, 5325 Sewell Social Science Building, Madison, WI, 53706, USA; Evolutionary Studies Institute and Centre for Excellence in PalaeoSciences, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa
| | - Lee R Berger
- Evolutionary Studies Institute and Centre for Excellence in PalaeoSciences, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa
| | - Jeremy M DeSilva
- Department of Anthropology, Dartmouth College, 409 Silsby, HB 6047, Hanover, USA; Evolutionary Studies Institute and Centre for Excellence in PalaeoSciences, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa
| | - Damiano Marchi
- Department of Biology, University of Pisa, vis Derna 1, Pisa, 56126, Italy; Evolutionary Studies Institute and Centre for Excellence in PalaeoSciences, University of the Witwatersrand, Private Bag 3, Wits, 2050, South Africa.
| |
Collapse
|
224
|
Tan NYQ, Sng CCA, Jonas JB, Wong TY, Jansonius NM, Ang M. Glaucoma in myopia: diagnostic dilemmas. Br J Ophthalmol 2019; 103:1347-1355. [DOI: 10.1136/bjophthalmol-2018-313530] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 12/27/2018] [Accepted: 04/03/2019] [Indexed: 11/03/2022]
Abstract
Myopic eyes have an increased risk of glaucoma. However, glaucomatous changes in a myopic eye are often difficult to detect. Classic structural and functional investigations to diagnose glaucoma may be confounded by myopia. Here, we identify some of the common pitfalls in interpreting these structural parameters, and the possible solutions that could be taken to overcome them. For instance, in myopic eyes, we discuss the limitations and potential sources of error when using neuroretinal rim parameters, and retinal nerve fibre layer and ganglion cell-inner plexiform layer thickness measurements. In addition, we also review new developments and potential adjuncts in structural imaging such as the assessment of the retinal nerve fibre layer texture, and the examination of the microcirculation of the optic nerve head using optical coherence tomography angiography. For the functional assessment of glaucoma, we discuss perimetric strategies that may aid in detecting characteristic visual field defects in myopic glaucoma. Ultimately, the evaluation of glaucoma in myopia requires a multimodal approach, to allow correlation between structural and functional assessments. This review provides overview on how to navigate this diagnostic dilemma.
Collapse
|
225
|
Ochirkhuyag A, Tóth IY, Kormányos A, Janáky C, Kónya Z. Composition-Dependent Optical and Photoelectrochemical Behavior of Antimony Oxide Iodides. JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2019. [DOI: 10.1149/2.0311905jes] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
226
|
Yoshikawa T, Obayashi K, Miyata K, Ueda T, Kurumatani N, Saeki K, Ogata N. Association between glaucomatous optic disc and depressive symptoms independent of light exposure profiles: a cross-sectional study of the HEIJO-KYO cohort. Br J Ophthalmol 2018; 103:1119-1122. [PMID: 30361277 DOI: 10.1136/bjophthalmol-2018-312176] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 09/07/2018] [Accepted: 10/06/2018] [Indexed: 11/04/2022]
Abstract
BACKGROUND Glaucoma may cause physiological and behavioural circadian misalignment because of the loss of intrinsically photosensitive retinal ganglion cells, the primary receptors of environmental light. Although studies have suggested a high prevalence of depression in patients with glaucoma, it is unclear whether the association is independent of the light exposure profiles as an important confounding factor. METHODS In this cross-sectional study of a community-based cohort of 770 elderly individuals (mean age, 70.9 years), glaucomatous optic discs were assessed using fundus photographs and depressive symptoms were assessed using the short version of the Geriatric Depression Scale (GDS). Daytime and night-time ambient light exposures were objectively measured for 2 days. RESULTS Depressive symptoms (GDS score ≥6) were observed in 114 participants (prevalence, 14.8%) and glaucomatous optic discs were detected in 40 participants (prevalence, 5.2%). The prevalence of depressive symptoms was significantly higher in the group with glaucomatous optic disc than in the group without it (30.0% vs 14.0%, respectively; p=0.005). Multivariable logistic regression analysis adjusted for potential confounding factors, including daytime and night-time light exposures, revealed that the OR for depressive symptoms was significantly higher in the group with glaucomatous optic disc than in the group without it (OR 2.45, 95% CI 1.18 to 5.08; p=0.016). CONCLUSIONS In this general elderly population, glaucomatous optic disc was significantly associated with higher prevalence of depressive symptoms independent of a number of potential confounding factors, including daily light exposure profiles.
Collapse
Affiliation(s)
- Tadanobu Yoshikawa
- Department of Ophthalmology, Nara Medical University School of Medicine, Nara, Japan
| | - Kenji Obayashi
- Department of Epidemiology, Nara Medical University School of Medicine, Nara, Japan
| | - Kimie Miyata
- Department of Ophthalmology, Nara Medical University School of Medicine, Nara, Japan
| | - Tetsuo Ueda
- Department of Ophthalmology, Nara Medical University School of Medicine, Nara, Japan
| | - Norio Kurumatani
- Department of Epidemiology, Nara Medical University School of Medicine, Nara, Japan
| | - Keigo Saeki
- Department of Epidemiology, Nara Medical University School of Medicine, Nara, Japan
| | - Nahoko Ogata
- Department of Ophthalmology, Nara Medical University School of Medicine, Nara, Japan
| |
Collapse
|
227
|
de Lange IM, Koudijs MJ, van ‘t Slot R, Sonsma ACM, Mulder F, Carbo EC, van Kempen MJA, Nijman IJ, Ernst RF, Savelberg SMC, Knoers NVAM, Brilstra EH, Koeleman BPC. Assessment of parental mosaicism in SCN1A-related epilepsy by single-molecule molecular inversion probes and next-generation sequencing. J Med Genet 2018; 56:75-80. [DOI: 10.1136/jmedgenet-2018-105672] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 09/24/2018] [Accepted: 09/30/2018] [Indexed: 01/08/2023]
Abstract
BackgroundDravet syndrome is a severe genetic encephalopathy, caused by pathogenic variants in SCN1A. Low-grade parental mosaicism occurs in a substantial proportion of families (7%–13%) and has important implications for recurrence risks. However, parental mosaicism can remain undetected by methods regularly used in diagnostics. In this study, we use single-molecule molecular inversion probes (smMIP), a technique with high sensitivity for detecting low-grade mosaic variants and high cost-effectiveness, to investigate the incidence of parental mosaicism of SCN1A variants in a cohort of 90 families and assess the feasibility of this technique.MethodsDeep sequencing of SCN1A was performed using smMIPs. False positive rates for each of the proband’s pathogenic variants were determined in 145 unrelated samples. If parents showed corresponding variant alleles at a significantly higher rate than the established noise ratio, mosaicism was confirmed by droplet digital PCR (ddPCR).ResultsSequence coverage of at least 100× at the location of the corresponding pathogenic variant was reached for 80 parent couples. The variant ratio was significantly higher than the established noise ratio in eight parent couples, of which four (5%) were regarded as true mosaics, based on ddPCR results. The false positive rate of smMIP analysis without ddPCR was therefore 50%. Three of these variants had previously been considered de novo in the proband by Sanger sequencing.ConclusionsmMIP technology combined withnext generation sequencing (NGS) performs better than Sanger sequencing in the detection of parental mosaicism. Because parental mosaicism has important implications for genetic counselling and recurrence risks, we stress the importance of implementing high-sensitivity NGS-based assays in standard diagnostics.
Collapse
|
228
|
Diamond MA, Chan SWS, Zhou X, Glinka Y, Girard E, Yucel Y, Gupta N. Lymphatic vessels identified in failed corneal transplants with neovascularisation. Br J Ophthalmol 2018; 103:421-427. [PMID: 30348644 PMCID: PMC6579550 DOI: 10.1136/bjophthalmol-2018-312630] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Revised: 09/18/2018] [Accepted: 09/23/2018] [Indexed: 11/04/2022]
Abstract
BACKGROUND Corneal transplant failure with neovascularisation is a leading indication for full-thickness grafts in patients. Lymphangiogenesis is implicated in the pathology of graft failure, and here we systematically evaluate failed human corneal transplants with neovascularisation for the presence of lymphatic vessels. METHODS Nine failed grafts with neovascularisation, based on H&E staining with subsequent immunoperoxidase staining for CD31, a blood vessel marker, were selected. Lymphatics were investigated by immunohistochemical and immunofluorescence approaches using podoplanin as a lymphatic marker. In two of nine cases, fluorescence in situ hybridisation (FISH) was used for detection of lymphatic mRNAs including podoplanin, VEGFR-3 and LYVE-1. All immunofluorescence and FISH samples were compared with positive and negative controls and visualised by confocal microscopy. RESULTS Corneal neovascularisation was established in all cases by H&E and further confirmed by CD31 immunoreactive profiles. Immunohistochemistry for the podoplanin antibody was positive in all cases and showed morphologies ranging from distinct luminal structures to elongated profiles. Simultaneous immunofluorescence using CD31 and podoplanin showed lymphatic vessels distinct from blood vessels. Podoplanin immunofluorescence was noted in seven of nine cases and revealed clear lumina of varying sizes, in addition to lumen-like and elongated profiles. The presence of lymphatic mRNA was confirmed by FISH studies using a combination of at least two of podoplanin, VEGFR-3 and LYVE-1 mRNAs. CONCLUSIONS The consistent finding of lymphatic vessels in failed grafts with neovascularisation implicates them in the pathogenesis of corneal transplant failure, and points to the lymphatics as a potential new therapeutic target.
Collapse
Affiliation(s)
- Michael Adam Diamond
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Sze Wah Samuel Chan
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Xun Zhou
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Yelena Glinka
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Eileen Girard
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada.,Ophthalmic Pathology Laboratory, Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada
| | - Yeni Yucel
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada.,Ophthalmic Pathology Laboratory, Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada.,Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada.,Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Neeru Gupta
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada .,Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada.,Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada.,Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| |
Collapse
|
229
|
Harrington SC, Stack J, Saunders K, O'Dwyer V. Refractive error and visual impairment in Ireland schoolchildren. Br J Ophthalmol 2018; 103:1112-1118. [PMID: 30315130 PMCID: PMC6678142 DOI: 10.1136/bjophthalmol-2018-312573] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 08/03/2018] [Accepted: 09/15/2018] [Indexed: 11/04/2022]
Abstract
Aim To report refractive error prevalence and visual impairment in Republic of Ireland (henceforth 'Ireland') schoolchildren. Methods The Ireland Eye Study examined 1626 participants (881 boys, 745 girls) in two age groups, 6–7 years (728) and 12–13 years (898), in Ireland between June 2016 and January 2018. Participating schools were selected by stratified random sampling, representing a mix of school type (primary/postprimary), location (urban/rural) and socioeconomic status (disadvantaged/advantaged). Examination included monocular logarithm of the minimum angle of resolution (logMAR) presenting visual acuity (with spectacles if worn) and cycloplegic autorefraction (1% Cyclopentolate Hydrochloride). Parents completed a questionnaire to ascertain participants’ lifestyle. Results The prevalence of myopia (spherical equivalent refraction (SER): ≤−0.50 D), hyperopia (SER: ≥+2.00 D) and astigmatism (≤−1.00 DC) among participants aged 6–7 years old was 3.3%, 25% and 19.2%, respectively, and among participants aged 12–13 years old was 19.9%, 8.9% and 15.9%, respectively. Astigmatic axes were predominately with-the-rule. The prevalence of ‘better eye’ presenting visual impairment (≥0.3 logMAR, with spectacles, if worn) was 3.7% among younger and 3.4% among older participants. Participants in minority groups (Traveller and non-white) were significantly more likely to present with presenting visual impairment in the ‘better eye’. Conclusions The Ireland Eye Study is the first population-based study to report on refractive error prevalence and visual impairment in Ireland. Myopia prevalence is similar to comparable studies of white European children, but the levels of presenting visual impairment are markedly higher than those reported for children living in Northern Ireland, suggesting barriers exist in accessing eye care.
Collapse
Affiliation(s)
- Siofra Christine Harrington
- School of Physics and Clinical and Optometric Sciences, College of Science and Health, Dublin Institute of Technology, Dublin, Ireland
| | - Jim Stack
- Waterford Institute of Technology, Waterford, Ireland
| | - Kathryn Saunders
- School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland
| | - Veronica O'Dwyer
- School of Physics and Clinical and Optometric Sciences, Dublin Institute of Technology, Dublin, Ireland
| |
Collapse
|
230
|
Doube M, Felder AA, Chua MY, Lodhia K, Kłosowski MM, Hutchinson JR, Shefelbine SJ. Limb bone scaling in hopping macropods and quadrupedal artiodactyls. ROYAL SOCIETY OPEN SCIENCE 2018; 5:180152. [PMID: 30473802 PMCID: PMC6227981 DOI: 10.1098/rsos.180152] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 09/24/2018] [Indexed: 06/09/2023]
Abstract
Bone adaptation is modulated by the timing, direction, rate and magnitude of mechanical loads. To investigate whether frequent slow, or infrequent fast, gaits could dominate bone adaptation to load, we compared scaling of the limb bones from two mammalian herbivore clades that use radically different high-speed gaits, bipedal hopping (suborder Macropodiformes; kangaroos and kin) and quadrupedal galloping (order Artiodactyla; goats, deer and kin). Forelimb and hindlimb bones were collected from 20 artiodactyl and 15 macropod species (body mass M 1.05-1536 kg) and scanned in computed tomography or X-ray microtomography. Second moment of area (I max) and bone length (l) were measured. Scaling relations (y = axb ) were calculated for l versus M for each bone and for I max versus M and I max versus l for every 5% of length. I max versus M scaling relationships were broadly similar between clades despite the macropod forelimb being nearly unloaded, and the hindlimb highly loaded, during bipedal hopping. I max versus l and l versus M scaling were related to locomotor and behavioural specializations. Low-intensity loads may be sufficient to maintain bone mass across a wide range of species. Occasional high-intensity gaits might not break through the load sensitivity saturation engendered by frequent low-intensity gaits.
Collapse
Affiliation(s)
- Michael Doube
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Skeletal Biology Group, The Royal Veterinary College, Royal College Street, London NW1 0TU, UK
- Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Alessandro A. Felder
- Skeletal Biology Group, The Royal Veterinary College, Royal College Street, London NW1 0TU, UK
| | - Melissa Y. Chua
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Kalyani Lodhia
- Skeletal Biology Group, The Royal Veterinary College, Royal College Street, London NW1 0TU, UK
| | | | - John R. Hutchinson
- Structure and Motion Laboratory, The Royal Veterinary College, North Mymms, Hatfield, Hertfordshire AL9 7TA, UK
| | - Sandra J. Shefelbine
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Department of Mechanical and Industrial Engineering, Northeastern University, 334 Snell Engineering Center, 360 Huntington Avenue, Boston, MA 02115, USA
| |
Collapse
|
231
|
Kennedy M, Ramsheh MY, Williams CML, Auty J, Haldar K, Abdulwhhab M, Brightling CE, Barer MR. Face mask sampling reveals antimicrobial resistance genes in exhaled aerosols from patients with chronic obstructive pulmonary disease and healthy volunteers. BMJ Open Respir Res 2018; 5:e000321. [PMID: 30271606 PMCID: PMC6157532 DOI: 10.1136/bmjresp-2018-000321] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 08/13/2018] [Indexed: 11/30/2022] Open
Abstract
Introduction The degree to which bacteria in the human respiratory tract are aerosolised by individuals is not established. Building on our experience sampling bacteria exhaled by individuals with pulmonary tuberculosis using face masks, we hypothesised that patients with conditions frequently treated with antimicrobials, such as chronic obstructive pulmonary disease (COPD), might exhale significant numbers of bacteria carrying antimicrobial resistance (AMR) genes and that this may constitute a previously undefined risk for the transmission of AMR. Methods Fifteen-minute mask samples were taken from 13 patients with COPD (five paired with contemporaneous sputum samples) and 10 healthy controls. DNA was extracted from cell pellets derived from gelatine filters mounted within the mask. Quantitative PCR analyses directed to the AMR encoding genes: blaTEM (β-lactamase), ErmB (target methylation), mefA (macrolide efflux pump) and tetM (tetracycline ribosomal protection protein) and six additional targets were investigated. Positive signals above control samples were obtained for all the listed genes; however, background signals from the gelatine precluded analysis of the additional targets. Results 9 patients with COPD (69%), aerosolised cells containing, in order of prevalence, mefA, tetM, ErmB and blaTEM, while three healthy controls (30%) gave weak positive signals including all targets except blaTEM. Maximum estimated copy numbers of AMR genes aerosolised per minute were mefA: 3010, tetM: 486, ErmB: 92 and blaTEM: 24. The profile of positive signals found in sputum was not concordant with that in aerosol in multiple instances. Discussion We identified aerosolised AMR genes in patients repeatedly exposed to antimicrobials and in healthy volunteers at lower frequencies and levels. The discrepancies between paired samples add weight to the view that sputum content does not define aerosol content. Mask sampling is a simple approach yielding samples from all subjects and information distinct from sputum analysis. Our results raise the possibility that patient-generated aerosols may be a significant means of AMR dissemination that should be assessed further and that consideration be given to related control measures.
Collapse
Affiliation(s)
- Matthew Kennedy
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK.,Department of Clinical Microbiology, University Hospitals of Leicester, Leicester, UK
| | - Mohammadali Y Ramsheh
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
| | - Caroline M L Williams
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
| | - Joss Auty
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
| | - Koirobi Haldar
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
| | - Mohamad Abdulwhhab
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
| | - Christopher E Brightling
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK.,Department of Clinical Microbiology, University Hospitals of Leicester, Leicester, UK
| | - Michael R Barer
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK.,Department of Clinical Microbiology, University Hospitals of Leicester, Leicester, UK
| |
Collapse
|
232
|
Uday S, Högler W. Prevention of rickets and osteomalacia in the UK: political action overdue. Arch Dis Child 2018; 103:901-906. [PMID: 29661756 DOI: 10.1136/archdischild-2018-314826] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 03/16/2018] [Accepted: 03/19/2018] [Indexed: 12/26/2022]
Abstract
The consequences of vitamin D and dietary calcium deficiency have become a huge public health concern in the UK. The burden of disease from these deficiencies includes rickets, and hypocalcaemic seizures, dilated cardiomyopathy and mostly occult myopathy and osteomalacia. The increasing burden of the disease is intrinsically linked to ethnicity and the population demographic changes in the UK. Three facts have led to the resurfacing of the English disease: (1) the UK has no ultraviolet sunlight for at least 6 months of the year, (2) dark skin produces far less vitamin D than white skin per unit ultraviolet light exposure, and (3) non-European Union immigration over the last century. To date, the UK government demonstrates incomplete understanding of these three facts, and its failure to adjust its prevention programmes to changing demographics is endangering the health and life of UK residents with dark skin, of whom infants are the most vulnerable. Establishing accountability through the implementation of monitored antenatal and infantile supplementation programmes and mandatory food fortification is overdue.
Collapse
Affiliation(s)
- Suma Uday
- Department of Endocrinology and Diabetes, Birmingham Women's and Children's Hospital, Birmingham, UK
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - Wolfgang Högler
- Department of Endocrinology and Diabetes, Birmingham Women's and Children's Hospital, Birmingham, UK
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| |
Collapse
|
233
|
Iijima M, Kubo T, Kobayashi Y. Comparative limb proportions reveal differential locomotor morphofunctions of alligatoroids and crocodyloids. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171774. [PMID: 29657781 PMCID: PMC5882705 DOI: 10.1098/rsos.171774] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 02/02/2018] [Indexed: 05/13/2023]
Abstract
Although two major clades of crocodylians (Alligatoroidea and Crocodyloidea) were split during the Cretaceous period, relatively few morphological and functional differences between them have been known. In addition, interaction of multiple morphofunctional systems that differentiated their ecology has barely been assessed. In this study, we examined the limb proportions of crocodylians to infer the differences of locomotor functions between alligatoroids and crocodyloids, and tested the correlation of locomotor and feeding morphofunctions. Our analyses revealed crocodyloids including Gavialis have longer stylopodia (humerus and femur) than alligatoroids, indicating that two groups may differ in locomotor functions. Fossil evidence suggested that alligatoroids have retained short stylopodia since the early stage of their evolution. Furthermore, rostral shape, an indicator of trophic function, is correlated with limb proportions, where slender-snouted piscivorous taxa have relatively long stylopodia and short overall limbs. In combination, trophic and locomotor functions might differently delimit the ecological opportunity of alligatoroids and crocodyloids in the evolution of crocodylians.
Collapse
Affiliation(s)
- Masaya Iijima
- Department of Natural History Sciences, Hokkaido University, N10W8 Kita-ku, Sapporo, Hokkaido, Japan
- Author for correspondence: Masaya Iijima e-mail:
| | - Tai Kubo
- The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Yoshitsugu Kobayashi
- Hokkaido University Museum, Hokkaido University, N10W8 Kita-ku, Sapporo, Hokkaido, Japan
| |
Collapse
|
234
|
Racine HL, Meadows CA, Ion G, Serrat MA. Heat-Induced Limb Length Asymmetry Has Functional Impact on Weight Bearing in Mouse Hindlimbs. Front Endocrinol (Lausanne) 2018; 9:289. [PMID: 29915560 PMCID: PMC5994414 DOI: 10.3389/fendo.2018.00289] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 05/15/2018] [Indexed: 12/14/2022] Open
Abstract
Limb length inequality results from many types of musculoskeletal disorders. Asymmetric weight bearing from a limb length discrepancy of less than 2% can have debilitating consequences such as back problems and early-onset osteoarthritis. Existing treatments include invasive surgeries and/or drug regimens that are often only partially effective. As a noninvasive alternative, we previously developed a once daily limb-heating model using targeted heat on one side of the body for 2 weeks to unilaterally increase bone length by up to 1.5% in growing mice. In this study, we applied heat for 1 week to determine whether these small differences in limb length are functionally significant, assessed by changes in hindlimb weight bearing. We tested the hypothesis that heat-induced limb length asymmetry has a functional impact on weight bearing in mouse hindlimbs. Female 3-week-old C57BL/6 mice (N = 12 total) were treated with targeted intermittent heat for 7 days (40 C for 40 min/day). High-resolution x-ray (N = 6) and hindlimb weight bearing data (N = 8) were acquired at the start and end of the experiments. There were no significant left-right differences in starting tibial length or hindlimb weight bearing. After 1-week heat exposure, tibiae (t = 7.7, p < 0.001) and femora (t = 11.5, p < 0.001) were ~1 and 1.4% longer, respectively, on the heat-treated sides (40 C) compared to the non-treated contralateral sides (30 C). Tibial elongation rate was over 6% greater (t = 5.19, p < 0.001). Hindlimb weight bearing was nearly 20% greater (t = 11.9, p < 0.001) and significantly correlated with the increase in tibial elongation rate on the heat-treated side (R2 = 0.82, p < 0.01). These results support the hypothesis that even a small limb length discrepancy can cause imbalanced weight distribution in healthy mice. The increase in bone elongation rate generated by localized heat could be a way to equalize limb length and weight bearing asymmetry caused by disease or trauma, leading to new approaches with better outcomes by using heat to lengthen limbs and reduce costly side effects of more invasive interventions.
Collapse
|
235
|
Abstract
During embryogenesis, the musculoskeletal system develops while containing within itself a force generator in the form of the musculature. This generator becomes functional relatively early in development, exerting an increasing mechanical load on neighboring tissues as development proceeds. A growing body of evidence indicates that such mechanical forces can be translated into signals that combine with the genetic program of organogenesis. This unique situation presents both a major challenge and an opportunity to the other tissues of the musculoskeletal system, namely bones, joints, tendons, ligaments and the tissues connecting them. Here, we summarize the involvement of muscle-induced mechanical forces in the development of various vertebrate musculoskeletal components and their integration into one functional unit.
Collapse
Affiliation(s)
- Neta Felsenthal
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Elazar Zelzer
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| |
Collapse
|
236
|
Cordero GA, Telemeco RS, Gangloff EJ. Reptile embryos are not capable of behavioral thermoregulation in the egg. Evol Dev 2017; 20:40-47. [DOI: 10.1111/ede.12244] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Rory S. Telemeco
- Department of BiologyCalifornia State UniversityFresnoCalifornia
| | - Eric J. Gangloff
- Department of EcologyEvolution, and Organismal BiologyIowa State UniversityAmesIowa
| |
Collapse
|
237
|
Hart N, Nimphius S, Rantalainen T, Ireland A, Siafarikas A, Newton R. Mechanical basis of bone strength: influence of bone material, bone structure and muscle action. JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS 2017; 17:114-139. [PMID: 28860414 PMCID: PMC5601257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 05/19/2017] [Indexed: 11/09/2022]
Abstract
This review summarises current understanding of how bone is sculpted through adaptive processes, designed to meet the mechanical challenges it faces in everyday life and athletic pursuits, serving as an update for clinicians, researchers and physical therapists. Bone's ability to resist fracture under the large muscle and locomotory forces it experiences during movement and in falls or collisions is dependent on its established mechanical properties, determined by bone's complex and multidimensional material and structural organisation. At all levels, bone is highly adaptive to habitual loading, regulating its structure according to components of its loading regime and mechanical environment, inclusive of strain magnitude, rate, frequency, distribution and deformation mode. Indeed, the greatest forces habitually applied to bone arise from muscular contractions, and the past two decades have seen substantial advances in our understanding of how these forces shape bone throughout life. Herein, we also highlight the limitations of in vivo methods to assess and understand bone collagen, and bone mineral at the material or tissue level. The inability to easily measure or closely regulate applied strain in humans is identified, limiting the translation of animal studies to human populations, and our exploration of how components of mechanical loading regimes influence mechanoadaptation.
Collapse
Affiliation(s)
- N.H. Hart
- Exercise Medicine Research Institute, Edith Cowan University, Perth, W.A., Australia
- Western Australian Bone Research Collaboration, Perth, W.A., Australia
| | - S. Nimphius
- Western Australian Bone Research Collaboration, Perth, W.A., Australia
- Centre for Exercise and Sport Science Research, Edith Cowan University, Perth, W.A., Australia
| | - T. Rantalainen
- Western Australian Bone Research Collaboration, Perth, W.A., Australia
- School of Exercise and Nutrition Sciences, Deakin University, Melbourne, VIC, Australia
| | - A. Ireland
- School of Healthcare Science, Manchester Metropolitan University, Manchester, United Kingdom
| | - A. Siafarikas
- Western Australian Bone Research Collaboration, Perth, W.A., Australia
- Department of Endocrinology, Princess Margaret Hospital, Perth, W.A., Australia
- School of Paediatrics and Child Health, University of Western Australia, Perth, W.A., Australia
- Institute of Health Research, University of Notre Dame Australia, Perth, W.A., Australia
| | - R.U. Newton
- Exercise Medicine Research Institute, Edith Cowan University, Perth, W.A., Australia
| |
Collapse
|
238
|
Vargas AO, Ruiz-Flores M, Soto-Acuña S, Haidr N, Acosta-Hospitaleche C, Ossa-Fuentes L, Muñoz-Walther V. The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds. Integr Comp Biol 2017; 57:1281-1292. [DOI: 10.1093/icb/icx074] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
239
|
Roselló-Díez A, Stephen D, Joyner AL. Altered paracrine signaling from the injured knee joint impairs postnatal long bone growth. eLife 2017; 6. [PMID: 28741471 PMCID: PMC5526667 DOI: 10.7554/elife.27210] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 07/03/2017] [Indexed: 12/23/2022] Open
Abstract
Regulation of organ growth is a poorly understood process. In the long bones, the growth plates (GPs) drive elongation by generating a scaffold progressively replaced by bone. Although studies have focused on intrinsic GP regulation, classic and recent experiments suggest that local signals also modulate GP function. We devised a genetic mouse model to study extrinsic long bone growth modulation, in which injury is specifically induced in the left hindlimb, such that the right hindlimb serves as an internal control. Remarkably, when only mesenchyme cells surrounding postnatal GPs were killed, left bone growth was nevertheless reduced. GP signaling was impaired by altered paracrine signals from the knee joint, including activation of the injury response and, in neonates, dampened IGF1 production. Importantly, only the combined prevention of both responses rescued neonatal growth. Thus, we identified signals from the knee joint that modulate bone growth and could underlie establishment of body proportions. DOI:http://dx.doi.org/10.7554/eLife.27210.001 As bones grow, their size is carefully controlled and coordinated with the growth of the other organs in the body. The mechanisms that control organ size also help the body to recover from injury, and play a key role in controlling body size and proportions. Over the course of evolution, these mechanisms have likely changed to produce the distinct body sizes and proportions seen in humans and other animals. Despite their importance, it is not well understood how signals from both inside and outside an organ work together to regulate its size. In growth disorders this signaling goes wrong, which can lead to a person having unusual proportions such as a very short stature or having one leg shorter than the other. Currently, most growth disorders that affect leg proportions are treated with painful surgical procedures. Researchers would like to know how bone growth is affected by signals from the surrounding tissues because this could help them to develop new non-invasive treatments for these conditions. Long bones, for example those in the leg, grow from structures near their ends called growth plates. Roselló-Díez et al. have now engineered mice in which an injury shortly after birth caused cells in the knee in the rear left leg to die off. At the same time, the rear right leg of the mice developed as normal, allowing the growth of the two legs to be compared. Roselló-Díez et al. found that the left leg of these mice grew more slowly than the right leg, even though none of the cells in the growth plate of the left leg bone had been damaged. Further investigation revealed that this was because the injury caused an imbalance between the growth-promoting and growth-restricting signals that are produced by the fat pad and articular cartilage in the knee joint. Restoring the lost balance allowed the left leg bone to grow to a more normal length. In the future, boosting bone growth signals might provide a way to treat conditions like dwarfism or leg-length discrepancies. Understanding how different tissues influence body proportions could also help researchers to investigate how different animals evolved different body proportions. DOI:http://dx.doi.org/10.7554/eLife.27210.002
Collapse
Affiliation(s)
- Alberto Roselló-Díez
- Developmental Biology Program, Sloan Kettering Institute, New York, United States
| | - Daniel Stephen
- Developmental Biology Program, Sloan Kettering Institute, New York, United States
| | - Alexandra L Joyner
- Developmental Biology Program, Sloan Kettering Institute, New York, United States.,Biochemistry, Cell and Molecular Biology Program, Weill Cornell Graduate Schoolof Medical Sciences, New York, United States
| |
Collapse
|
240
|
Joyce W. Fidgety embryos grow longer limbs. J Exp Biol 2017. [DOI: 10.1242/jeb.147413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|