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Kanjira SC, Adams MJ, Yunxuan J, Chao T, Lewis CM, Kuchenbaecker K, McIntosh AM. Polygenic prediction of major depressive disorder and related traits in African ancestries UK Biobank participants. medRxiv 2023:2023.12.24.23300412. [PMID: 38234770 PMCID: PMC10793522 DOI: 10.1101/2023.12.24.23300412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
Introduction Genome-Wide Association Studies (GWAS) over-represent European ancestries compared to the global population, neglecting all other ancestry groups and low-income nations. Consequently, polygenic risk scores (PRS) more accurately predict complex traits in Europeans than African Ancestries groups. Very few studies have looked at the transferability of European-derived PRS for behavioural and mental health phenotypes to non-Europeans. We assessed the comparative accuracy of PRS for Major Depressive Disorder (MDD) trained on European and African Ancestries GWAS studies to predict MDD and related traits in African Ancestries participants from the UK Biobank. Methods UK Biobank participants were selected based on Principal component analysis (PCA) clustering with an African genetic similarity reference population and MDD was assessed with the Composite International Diagnostic Interview (CIDI). Polygenic Risk Scores (PRS) were computed using PRSice2 using either European or African Ancestries GWAS summary statistics. Results PRS trained on European ancestry samples (246,363 cases) predicted case control status in Africans of the UK Biobank with similar accuracies (190 cases, R2=2%) to PRS trained on far much smaller samples of African Ancestries participants from 23andMe, Inc. (5045 cases, R2=1.8%). This suggests that prediction of MDD status from Africans to Africans had greater efficiency per unit increase in the discovery sample size than prediction of MDD from Europeans to Africans. Prediction of MDD status in African UK Biobank participants using GWAS findings of causal risk factors from European ancestries was non-significant. Conclusion GWAS studies of MDD in European ancestries are an inefficient means of improving polygenic prediction accuracy in African samples.
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Affiliation(s)
- S C Kanjira
- Centre for Clinical Brain Sciences, University of Edinburgh, UK
- Malawi Epidemiology and Intervention Research Unit, Lilongwe, Malawi
| | - M J Adams
- Centre for Clinical Brain Sciences, University of Edinburgh, UK
| | | | | | | | | | - A M McIntosh
- Centre for Clinical Brain Sciences, University of Edinburgh, UK
- Centre for Genomic and Experimental Medicine, University of Edinburgh, UK
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Boahen A, Hu D, Adams MJ, Nicholls PK, Greene WK, Ma B. Bidirectional crosstalk between the peripheral nervous system and lymphoid tissues/organs. Front Immunol 2023; 14:1254054. [PMID: 37767094 PMCID: PMC10520967 DOI: 10.3389/fimmu.2023.1254054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 08/25/2023] [Indexed: 09/29/2023] Open
Abstract
The central nervous system (CNS) influences the immune system generally by regulating the systemic concentration of humoral substances (e.g., cortisol and epinephrine), whereas the peripheral nervous system (PNS) communicates specifically with the immune system according to local interactions/connections. An imbalance between the components of the PNS might contribute to pathogenesis and the further development of certain diseases. In this review, we have explored the "thread" (hardwiring) of the connections between the immune system (e.g., primary/secondary/tertiary lymphoid tissues/organs) and PNS (e.g., sensory, sympathetic, parasympathetic, and enteric nervous systems (ENS)) in health and disease in vitro and in vivo. Neuroimmune cell units provide an anatomical and physiological basis for bidirectional crosstalk between the PNS and the immune system in peripheral tissues, including lymphoid tissues and organs. These neuroimmune interactions/modulation studies might greatly contribute to a better understanding of the mechanisms through which the PNS possibly affects cellular and humoral-mediated immune responses or vice versa in health and diseases. Physical, chemical, pharmacological, and other manipulations of these neuroimmune interactions should bring about the development of practical therapeutic applications for certain neurological, neuroimmunological, infectious, inflammatory, and immunological disorders/diseases.
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Affiliation(s)
- Angela Boahen
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Seri-Kembangan, Selangor, Malaysia
| | - Dailun Hu
- Department of Pathogenic Biology, Hebei Medical University, Shijiazhuang, Hebei, China
| | - Murray J. Adams
- School of Medical, Molecular and Forensic Sciences, Murdoch University, Murdoch, WA, Australia
| | - Philip K. Nicholls
- School of Medical, Molecular and Forensic Sciences, Murdoch University, Murdoch, WA, Australia
| | - Wayne K. Greene
- School of Medical, Molecular and Forensic Sciences, Murdoch University, Murdoch, WA, Australia
| | - Bin Ma
- School of Medical, Molecular and Forensic Sciences, Murdoch University, Murdoch, WA, Australia
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3
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Ho YC, Brake SJ, Ahuja K, Acott N, Tiao J, Baker R, Adams MJ. IgG fractions from patients with antiphospholipid syndrome and systemic lupus erythematosus bind to platelets, but do not affect collagen-induced platelet activation. Biotech Histochem 2022; 97:604-615. [PMID: 35394397 DOI: 10.1080/10520295.2022.2049878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Anti-beta-2 glycoprotein 1 (anti-β2GP1) is an antiphospholipid antibody found in patients with antiphospholipid syndrome (APS) and systemic lupus erythematosus (SLE). Its presence commonly is associated with thrombosis; however, the mechanisms of interaction of anti-β2GP1 antibodies and platelets remain unclear. We investigated the effects of APS and SLE patient-derived IgG fractions on collagen-mediated platelet aggregation and examined the binding of patient-derived IgG to platelets before and after activation by collagen. IgG fractions, 150, 200, 300 or 350 µg/ml, isolated from 11 patients with APS and SLE were incubated with two sets of platelet-rich plasma (PRP) in the incubation wells of an aggregometer. The first set was activated by collagen and the other set was incubated for an additional 10 min. All platelets were collected by centrifugation and fixed in cell blocks. We assessed binding of IgG to platelets using immunocytochemistry (ICC). Patient-derived IgG fractions did not affect collagen-induced platelet aggregation. ICC staining using anti-human IgG antibodies demonstrated that patient-derived IgG fractions had greater affinity for non-activated platelets than those activated by 0.75 µg/ml collagen. Patient-derived IgG fractions bound to the surface of platelets and potentially could be internalized by platelets. IgG fractions from APS and SLE patients may sensitize non-activated platelets, which could increase platelet reactivity and thrombotic risk in patients. We did not detect secondary effects of patient-derived IgG fractions.
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Affiliation(s)
- Y C Ho
- School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia
| | - S J Brake
- School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia
| | - Kdk Ahuja
- School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia
| | - N Acott
- PathWest Laboratory Medicine Western Australia, Nedlands, Western Australia, Australia
| | - J Tiao
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Western Australia, Australia
| | - R Baker
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Western Australia, Australia
| | - M J Adams
- College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Western Australia, Australia
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4
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Tian J, Adams MJ, Tay JWT, James I, Powell S, Hughes QW, Gilmore G, Baker RI, Tiao JYH. Estradiol-Responsive miR-365a-3p Interacts with Tissue Factor 3'UTR to Modulate Tissue Factor-Initiated Thrombin Generation. Thromb Haemost 2021; 121:1483-1496. [PMID: 33540457 DOI: 10.1055/a-1382-9983] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND High estradiol (E2) levels are linked to an increased risk of venous thromboembolism; however, the underlying molecular mechanism(s) remain poorly understood. We previously identified an E2-responsive microRNA (miR), miR-494-3p, that downregulates protein S expression, and posited additional coagulation factors, such as tissue factor, may be regulated in a similar manner via miRs. OBJECTIVES To evaluate the coagulation capacity of cohorts with high physiological E2, and to further characterize novel E2-responsive miR and miR regulation on tissue factor in E2-related hypercoagulability. METHODS Ceveron Alpha thrombin generation assay (TGA) was used to assess plasma coagulation profile of three cohorts. The effect of physiological levels of E2, 10 nM, on miR expression in HuH-7 cells was compared using NanoString nCounter and validated with independent assays. The effect of tissue factor-interacting miR was confirmed by dual-luciferase reporter assays, immunoblotting, flow cytometry, biochemistry assays, and TGA. RESULTS Plasma samples from pregnant women and women on the contraceptive pill were confirmed to be hypercoagulable (compared with sex-matched controls). At equivalent and high physiological levels of E2, miR-365a-3p displayed concordant E2 downregulation in two independent miR quantification platforms, and tissue factor protein was upregulated by E2 treatment. Direct interaction between miR-365a-3p and F3-3'UTR was confirmed and overexpression of miR-365a-3p led to a decrease of (1) tissue factor mRNA transcripts, (2) protein levels, (3) activity, and (4) tissue factor-initiated thrombin generation. CONCLUSION miR-365a-3p is a novel tissue factor regulator. High E2 concentrations induce a hypercoagulable state via a miR network specific for coagulation factors.
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Affiliation(s)
- Jiayin Tian
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Perth, Australia.,Perth Blood Institute, West Perth, Perth, Australia.,College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Perth, Australia.,Centre for Molecular Medicine and Innovative Therapeutics, Health Futures Institute, Murdoch University, Murdoch, Perth, Australia
| | - Murray J Adams
- College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Perth, Australia
| | - Jasmine Wee Ting Tay
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Perth, Australia.,Perth Blood Institute, West Perth, Perth, Australia
| | - Ian James
- Institute for Immunology and Infectious Diseases, Murdoch University, Murdoch, Perth, Australia
| | - Suzanne Powell
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Perth, Australia
| | - Quintin W Hughes
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Perth, Australia.,Perth Blood Institute, West Perth, Perth, Australia
| | - Grace Gilmore
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Perth, Australia.,Perth Blood Institute, West Perth, Perth, Australia.,Centre for Molecular Medicine and Innovative Therapeutics, Health Futures Institute, Murdoch University, Murdoch, Perth, Australia
| | - Ross I Baker
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Perth, Australia.,Perth Blood Institute, West Perth, Perth, Australia.,Centre for Molecular Medicine and Innovative Therapeutics, Health Futures Institute, Murdoch University, Murdoch, Perth, Australia
| | - Jim Yu-Hsiang Tiao
- Western Australian Centre for Thrombosis and Haemostasis, Murdoch University, Murdoch, Perth, Australia.,Perth Blood Institute, West Perth, Perth, Australia.,Centre for Molecular Medicine and Innovative Therapeutics, Health Futures Institute, Murdoch University, Murdoch, Perth, Australia
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5
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Zadow EK, Edwards KH, Kitic CM, Fell JW, Adams MJ, Singh I, Kundur A, Johnston ANB, Crilly J, Bulmer AC, Halson SL, Wu SSX. Compression Socks Reduce Running-Induced Intestinal Damage. J Strength Cond Res 2020; 36:2461-2464. [PMID: 33065702 DOI: 10.1519/jsc.0000000000003870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Zadow, EK, Edwards, KH, Kitic, CM, Fell, JW, Adams, MJ, Singh, I, Kundur, A, Johnstone, ANB, Crilly, J, Bulmer, AC, Halson, SL, and, and Wu, SSX. Compression socks reduce running-induced intestinal damage. J Strength Cond Res XX(X): 000-000, 2020-Exercise is associated with a reduction in splanchnic blood flow that leads to the disruption of intestinal epithelium integrity, contributing to exercise-induced gastrointestinal syndrome. Strategies that promote intestinal blood flow during exercise may reduce intestinal damage, which may be advantageous for subsequent recovery and performance. This study aimed to explore if exercise-associated intestinal damage was influenced by wearing compression garments, which may improve central blood flow. Subjects were randomly allocated to wear compression socks (n = 23) or no compression socks (control, n = 23) during a marathon race. Blood samples were collected 24 hours before and immediately after marathon and analyzed for intestinal fatty acid-binding protein (I-FABP) concentration as a marker of intestinal damage. The magnitude of increase in postmarathon plasma I-FABP concentration was significantly greater in control group (107%; 95% confidence interval [CI], 72-428%) when compared with runners wearing compression socks (38%; 95% CI, 20-120%; p = 0.046; d = 0.59). Wearing compression socks during a marathon run reduced exercise-associated intestinal damage. Compression socks may prove an effective strategy to minimize the intestinal damage component of exercise-induced gastrointestinal syndrome.
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Affiliation(s)
- Emma K Zadow
- Holsworth Research Initiative, College Science Health and Engineering, La Trobe Rural Health School, La Trobe University, Bendigo, Australia
| | - Kate H Edwards
- School of Health Sciences, Sports Performance Optimization Research Team, University of Tasmania, Launceston, Australia
| | - Cecilia M Kitic
- School of Health Sciences, Sports Performance Optimization Research Team, University of Tasmania, Launceston, Australia
| | - James W Fell
- School of Health Sciences, Sports Performance Optimization Research Team, University of Tasmania, Launceston, Australia
| | - Murray J Adams
- School of Health Sciences, Sports Performance Optimization Research Team, University of Tasmania, Launceston, Australia.,School of Veterinary and Life Sciences, Murdoch University, Perth, Australia
| | - Indu Singh
- Menzies Health Institute Queensland and School of Medical Science, Griffith University, Gold Coast, Australia
| | - Avinash Kundur
- Menzies Health Institute Queensland and School of Medical Science, Griffith University, Gold Coast, Australia
| | - Amy N B Johnston
- Department of Emergency Medicine, Gold Coast Health, Gold Coast, Australia
| | - Julia Crilly
- School of Nursing and Midwifery and Menzies Health Institute, Queensland, Griffith University, Gold Coast, Australia.,Department of Emergency Medicine, Gold Coast Health, Gold Coast, Australia
| | - Andrew C Bulmer
- Menzies Health Institute Queensland and School of Medical Science, Griffith University, Gold Coast, Australia
| | - Shona L Halson
- Department of Physiology, Australian Institute of Sport, Belconnen, Australia.,School of Behavioural and Health Sciences, Australian Catholic University, McAuley at Banyo, Australia
| | - Sam S X Wu
- School of Health Sciences, Sports Performance Optimization Research Team, University of Tasmania, Launceston, Australia.,Department of Health and Medical Sciences, Swinburne University of Technology, Melbourne, Australia
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Abstract
For most mammals, touch is the first sense to develop. They must feel vibrations on the surface of their skin to enable them to respond to various stimuli in their environment, a process called vibrotaction. But how do mammals perceive these vibrations? Through mathematical modeling of the skin and touch receptors, we show that vibrotaction is dominated by "surface" Rayleigh waves traveling cooperatively through all layers of the skin and bone. Applying our model to experimental data, we identify a universal scaling law for the depth of touch receptors across multiple species, indicating an evolutionarily conserved constant in the sensation of vibrations.
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Affiliation(s)
- J W Andrews
- School of Mathematics, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - M J Adams
- School of Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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7
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Moffat KA, Kiencke V, Blanco AN, McLintock C, Peyvandi F, de Maat MPM, Adams MJ, Angchaisuksiri P, Nair S, Tsuda H, Haddad M, Renné T, Clark RC, Ross MT. International Society on Thrombosis and Haemostasis core curriculum project: Core competencies in laboratory thrombosis and hemostasis. J Thromb Haemost 2019; 17:1848-1859. [PMID: 31400072 DOI: 10.1111/jth.14601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 08/05/2019] [Indexed: 11/30/2022]
Abstract
BACKGROUND Laboratory analyses of blood samples are essential for diagnostics and therapy monitoring of patients with bleeding and thromboembolic diseases. Following publication of the core curriculum for clinical thrombosis and hemostasis, the International Society on Thrombosis and Haemostasis (ISTH) recognized that thrombosis and hemostasis laboratory specialists require distinct competencies that differ from medical doctors working clinically with patients. To address this gap the ISTH formed a working group of international hemostasis and thrombosis laboratory specialists to develop an evidence-based core curriculum for laboratory specialists. OBJECTIVE This research sought consensus from the international community on core competencies required for laboratory specialists in thrombosis and hemostasis. METHODS A draft list of 64 competencies was developed and an online stakeholder survey was circulated electronically to 15 302 ISTH members and contacts in the wider international community. The results were analyzed and used to develop the final approved core curriculum. RESULTS Three hundred and thirty responses contained meaningful data, with broad international representation of specialists. No draft competencies were excluded, and 58 were rated as "does" or "shows how." The Leik measure of consensus for most competences was "moderate" (n = 30) or "fair" (n = 32). CONCLUSIONS The development of an international core curriculum for laboratory specialists provides a foundation for the development and enhancement of education and quality management of the laboratory. Although there is no formal designation for laboratory specialists, international governing bodies and regulatory organizations are encouraged to consider the diagnostic core curriculum for development and accreditation of more standardized educational programs and formal assessment across jurisdictions.
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Affiliation(s)
- Karen A Moffat
- Hamilton Regional Laboratory Medicine Program, Hamilton, ON, Canada
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Verena Kiencke
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Alicia N Blanco
- Hemostasis and Thrombosis Department, IIHEMA-National Academy of Medicine, Buenos Aires, Argentina
| | - Claire McLintock
- National Women's Health, Auckland City Hospital, Auckland, New Zealand
| | - Flora Peyvandi
- Angelo Bianchi Bonomi Haemophilia and Thrombosis Center, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
| | - Moniek P M de Maat
- Department of Hematology, Erasmus MC, University Medical Center Rotterdam,, Rotterdam, the Netherlands
| | - Murray J Adams
- College of Science, Health, Engineering and Education, Murdoch University, Murdoch, WA, Australia
| | | | - Sukesh Nair
- Department of Immunohematology & Transfusion Medicine, Christian Medical College, Vellore, India
| | - Hiroko Tsuda
- Department of Nutritional Sciences, Nakamura Gakuen University, Fukuoka, Japan
| | - Munif Haddad
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Thomas Renné
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - R Cary Clark
- International Society on Thrombosis and Haemostasis, Carrboro, NC, USA
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8
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Adams MJ, Jevtics D, Strain MJ, Henning ID, Hurtado A. High-frequency dynamics of evanescently-coupled nanowire lasers. Sci Rep 2019; 9:6126. [PMID: 30992501 PMCID: PMC6467891 DOI: 10.1038/s41598-019-42526-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 04/02/2019] [Indexed: 11/30/2022] Open
Abstract
We analyse the dynamics and conditions for stability in an array of two laterally-coupled nanowire lasers in terms of their separation, difference in resonant frequencies and pumping rate under conditions of weak coupling. We find that the regions of stability are very small and are found close to zero frequency offset between the lasers. Outside these regions various forms of instability including periodic oscillation, chaos and complex dynamics are predicted. Importantly, the analysis of the frequency of periodic oscillations for realistic laser separations and pumping yields values of order 100 GHz thus underlining the significant potential of nanowire laser arrays for ultra-high frequency on-chip systems with very low foot-print and energy requirements.
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Affiliation(s)
- M J Adams
- School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK
| | - D Jevtics
- Institute of Photonics, SUPA Department of Physics, University of Strathclyde, TIC Centre, 99 George Street, Glasgow, G1 1RD, UK
| | - M J Strain
- Institute of Photonics, SUPA Department of Physics, University of Strathclyde, TIC Centre, 99 George Street, Glasgow, G1 1RD, UK
| | - I D Henning
- School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK
| | - A Hurtado
- Institute of Photonics, SUPA Department of Physics, University of Strathclyde, TIC Centre, 99 George Street, Glasgow, G1 1RD, UK.
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9
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Mahmah O, Adams MJ, Omar CS, Gururajan B, Salman AD. Roller compaction: Ribbon splitting and sticking. Int J Pharm 2019; 559:156-172. [PMID: 30682449 DOI: 10.1016/j.ijpharm.2019.01.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/20/2018] [Accepted: 01/11/2019] [Indexed: 10/27/2022]
Abstract
Roller compaction is the main technique employed in dry granulation. Ribbon sticking and splitting are among the major factors that can hinder the use of this process for some formulations. Ribbon splitting can occur either transversally (through the ribbon thickness) or longitudinally (through the ribbon width). It was observed that transverse splitting is commonly associated with sticking of the split ribbons to the rollers and results in an inferior performance of the process. Longitudinal splitting is associated with an across-width distribution of the ribbon density so that there may an adverse effect on the mechanical strength and dissolution properties of the tablets formed from the milled granules. The aim of the current work was to elucidate the mechanisms of splitting by an experimental study involving single component powders with a range of yield strengths, including those that are commonly used as excipients. Both smooth and knurled rollers were employed without and with lubrication by applying magnesium stearate to the rollers. The minimum gap was fixed and the maximum roll stress was varied. The observed trends for the smooth rollers were rationalised in terms of a splitting index, which is a measure of the residual stresses driving crack growth relative to the tensile strength of the ribbons. There was a lower limit at which splitting was observed but the occurrence of transverse splitting decreased and that for longitudinal splitting increased with increasing values of the index, which was accompanied by an increase in mixed transverse-longitudinal splitting. Transverse splitting was always associated with sticking to the rollers and was prevented by external lubrication. The main difference with the knurled rollers was that in some cases transverse splitting occurred without sticking to the rollers. A detailed discussion of the mechanisms involved is presented.
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Affiliation(s)
- Osama Mahmah
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK.
| | - M J Adams
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
| | - Chalak S Omar
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK
| | | | - Agba D Salman
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK
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Abstract
We investigated the incidence of ex vivo incompatibility between ovine maternal RBC and fetal plasma. Time-mated singleton pregnant ewes (n = 8) underwent cesarean delivery of the fetus; at the time of delivery, paired maternal and fetal blood samples were collected and subsequently separated for storage as packed RBC and fresh frozen plasma. Gel column crossmatching was performed 3 to 4 wk later. All fetus-dam crossmatches were considered major crossmatches, combining fetal (recipient) plasma with dam (donor) RBC. The plasma of 8 fetuses was cross-matched with RBC from 5 dams; all autologous controls were negative, and all but one crossmatch (1 of 40, 2.5%) were considered compatible. In addition, the plasma of 3 dams was crossmatched with RBC from 5 dams; all autologous controls were negative; however, significant incompatibility was noted. In total, 4 of 13 (30.8%) dam-dam crossmatches were considered incompatible. The results of this initial study suggest that when a single animal receives multiple blood-product transfusions, the risk of an immunologic transfusion reaction can be reduced by ensuring that the blood products are obtained from a single donor, performing a crossmatch prior to transfusion, and the use of synthetic products to increase the oxygen carrying capacity of fetal blood.
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Affiliation(s)
- Gabrielle C Musk
- Animal Care Services, University of Western Australia, Crawley, Western Australia, Australia.
| | - Murray J Adams
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, Australia
| | - Haruo Usuda
- Division of Obstetrics and Gynaecology, University of Western Australia, Crawley, Western Australia, Australia
| | - Matthew W Kemp
- Division of Obstetrics and Gynaecology, University of Western Australia, Crawley, Western Australia, Australia
| | - Claire R Sharp
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, Australia
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11
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Li N, Susanto H, Cemlyn BR, Henning ID, Adams MJ. Mapping bifurcation structure and parameter dependence in quantum dot spin-VCSELs. Opt Express 2018; 26:14636-14649. [PMID: 29877498 DOI: 10.1364/oe.26.014636] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 04/26/2018] [Indexed: 06/08/2023]
Abstract
We consider a modified version of the spin-flip model (SFM) that describes optically pumped quantum dot (QD) spin-polarized vertical-cavity surface-emitting lasers (VCSELs). Maps showing different dynamical regions and those consisting of various key bifurcations are constructed by direct numerical simulations and a numerical path continuation technique, respectively. A comparison between them clarifies the physical mechanism that governs the underlying dynamics as well as routes to chaos in QD spin-VCSELs. Detailed numerical simulations illustrate the role played by the capture rate from wetting layer (WL) to QD ground state, the gain parameter, and the amplitude-phase coupling. By tuning the aforementioned key parameters in turn we show how the dynamical regions evolve as a function of the intensity and polarization of the optical pump, as well as in the plane of the spin relaxation rate and linear birefringence rate, which is of importance in the design of spin lasers promising potential applications. By increasing the capture rate from WL to QD our simulation accurately describes the transition from the QD spin-VCSEL to the quantum well case, in agreement with a previous mathematical derivation, and thus validates the modified SFM equations.
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12
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Li N, Susanto H, Cemlyn BR, Henning ID, Adams MJ. Nonlinear dynamics of solitary and optically injected two-element laser arrays with four different waveguide structures: a numerical study. Opt Express 2018; 26:4751-4765. [PMID: 29475321 DOI: 10.1364/oe.26.004751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 01/24/2018] [Indexed: 06/08/2023]
Abstract
We study the nonlinear dynamics of solitary and optically injected two-element laser arrays with a range of waveguide structures. The analysis is performed with a detailed direct numerical simulation, where high-resolution dynamic maps are generated to identify regions of dynamic instability in the parameter space of interest. Our combined one- and two-parameter bifurcation analysis uncovers globally diverse dynamical regimes (steady-state, oscillation, and chaos) in the solitary laser arrays, which are greatly influenced by static design waveguiding structures, the amplitude-phase coupling factor of the electric field, i.e. the linewidth-enhancement factor, as well as the control parameter, e.g. the pump rate. When external optical injection is introduced to one element of the arrays, we show that the whole system can be either injection-locked simultaneously or display rich, different dynamics outside the locking region. The effect of optical injection is to significantly modify the nature and the regions of nonlinear dynamics from those found in the solitary case. We also show similarities and differences (asymmetry) between the oscillation amplitude of the two elements of the array in specific well-defined regions, which hold for all the waveguiding structures considered. Our findings pave the way to a better understanding of dynamic instability in large arrays of lasers.
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13
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Li N, Susanto H, Cemlyn BR, Henning ID, Adams MJ. Locking bandwidth of two laterally-coupled semiconductor lasers subject to optical injection. Sci Rep 2018; 8:109. [PMID: 29311659 PMCID: PMC5758791 DOI: 10.1038/s41598-017-18379-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 12/08/2017] [Indexed: 11/23/2022] Open
Abstract
We report here for the first time (to our knowledge), a new and universal mechanism by which a two-element laser array is locked to external optical injection and admits stably injection-locked states within a nontrivial trapezoidal region. The rate equations for the system are studied both analytically and numerically. We derive a simple mathematical expression for the locking conditions, which reveals that two parallel saddle-node bifurcation branches, not reported for conventional single lasers subject to optical injection, delimit the injection locking range and its width. Important parameters are the linewidth enhancement factor, the laser separation, and the frequency offset between the two laterally-coupled lasers; the influence of these parameters on locking conditions is explored comprehensively. Our analytic approximations are validated numerically by using a path continuation technique as well as direct numerical integration of the rate equations. More importantly, our results are not restricted by waveguiding structures and uncover a generic locking behavior in the lateral arrays in the presence of injection.
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Affiliation(s)
- Nianqiang Li
- School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom
| | - H Susanto
- Department of Mathematical Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom
| | - B R Cemlyn
- School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom
| | - I D Henning
- School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom
| | - M J Adams
- School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom.
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14
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Muths E, Chambert T, Schmidt BR, Miller DAW, Hossack BR, Joly P, Grolet O, Green DM, Pilliod DS, Cheylan M, Fisher RN, McCaffery RM, Adams MJ, Palen WJ, Arntzen JW, Garwood J, Fellers G, Thirion JM, Besnard A, Grant EHC. Heterogeneous responses of temperate-zone amphibian populations to climate change complicates conservation planning. Sci Rep 2017; 7:17102. [PMID: 29213103 PMCID: PMC5719039 DOI: 10.1038/s41598-017-17105-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 11/22/2017] [Indexed: 11/08/2022] Open
Abstract
The pervasive and unabated nature of global amphibian declines suggests common demographic responses to a given driver, and quantification of major drivers and responses could inform broad-scale conservation actions. We explored the influence of climate on demographic parameters (i.e., changes in the probabilities of survival and recruitment) using 31 datasets from temperate zone amphibian populations (North America and Europe) with more than a decade of observations each. There was evidence for an influence of climate on population demographic rates, but the direction and magnitude of responses to climate drivers was highly variable among taxa and among populations within taxa. These results reveal that climate drivers interact with variation in life-history traits and population-specific attributes resulting in a diversity of responses. This heterogeneity complicates the identification of conservation 'rules of thumb' for these taxa, and supports the notion of local focus as the most effective approach to overcome global-scale conservation challenges.
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Affiliation(s)
- E Muths
- U.S. Geological Survey, Fort Collins Science Center, 2150 Centre Ave., Bldg C, Fort Collins, CO, 80526, USA.
| | - T Chambert
- Pennsylvania State University, Department of Ecosystem Science and Management, University Park, PA, 16802, USA
- U.S. Geological Survey, Patuxent Wildlife Research Center, Laurel, MD, 20708, USA
| | - B R Schmidt
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, 8057, Zurich, Switzerland
- Info Fauna KARCH, 2000, Neuchâtel, Switzerland
| | - D A W Miller
- Pennsylvania State University, Department of Ecosystem Science and Management, University Park, PA, 16802, USA
| | - B R Hossack
- U.S. Geological Survey, Aldo Leopold Wilderness Research Institute, 790 E. Beckwith, Missoula, MT, 59801, USA
| | - P Joly
- Université Lyon 1, UMR 5023 - LEHNA, Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, 69100, Villeurbanne, France
| | - O Grolet
- Université Lyon 1, UMR 5023 - LEHNA, Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, 69100, Villeurbanne, France
| | - D M Green
- Redpath Museum, McGill University, 859 Sherbrooke St. W. Montreal, Quebec, H3A 2K6, Canada
| | - D S Pilliod
- U.S. Geological, Survey Forest and Rangeland Ecosystem Science Center, 970 Lusk St, Boise, ID, 83706, USA
| | - M Cheylan
- CNRS, PSL Research University, EPHE, UM, SupAgro, IRD, INRA, UMR 5175 CEFE, F-34293, Montpellier, France
| | - R N Fisher
- U.S. Geological Survey, Western Ecological Research Center, San Diego Field Station, 4165 Spruance Road, San Diego, CA, 92101, USA
| | - R M McCaffery
- University of Montana, Division of Biological Sciences, 32 Campus Dr., Missoula, MT, USA
- U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, 600 E. Park Ave, Port Angeles, WA, 98362, USA
| | - M J Adams
- U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR, 97331, USA
| | - W J Palen
- Simon Fraser University, Department of Biological Sciences, 8888 University Drive Burnaby, British Columbia, CANADA V5A 1S6, Canada
| | - J W Arntzen
- Naturalis Biodiversity Center, 6.4.16 Sylvius Bldg, 2333 CR, Leiden, The Netherlands
| | - J Garwood
- California Department of Fish and Wildlife, 5341 Ericson Way, Arcata, CA, 95521, USA
| | - G Fellers
- U.S. Geological Survey, Western Ecological Research Center, Point Reyes National Seashore, Point Reyes, CA, 94956, USA
| | - J-M Thirion
- Association Objectifs Biodiversités (OBIOS), 12 rue du docteur Gilbert, 17250, Pont l'Abbé d'Arnoult, France
| | - A Besnard
- CNRS, PSL Research University, EPHE, UM, SupAgro, IRD, INRA, UMR 5175 CEFE, F-34293, Montpellier, France
| | - E H Campbell Grant
- U.S. Geological Survey, Patuxent Wildlife Research Center, SO Conte Anadromous Fish Laboratory, One Migratory Way, Turners Falls, MA, 01376, USA
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15
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Abstract
Anti-beta-2-glycoprotein 1 (anti-β2GP1) antibodies are associated with increased thrombotic risk in patients with autoimmune disease. There is conflicting evidence on the effects of anti-β2GP1 antibodies on platelets, with both enhanced and inhibited aggregation previously reported. However, previous studies did not include isotype antibodies to ensure the observed effects were due to anti-β2GP1 antibodies. The aims of this study were to (1) investigate the effects of anti-β2GP1 antibodies on collagen-induced platelet aggregation in parallel with negative control (buffer normal saline) and isotype control antibodies and (2) determine the lupus anticoagulant (LA) activity of anti-β2GP1 antibodies used. Three animal-derived anti-human-β2GP1 antibodies (1.25, 2.5, and 5 μg/mL) incubated with healthy platelet-rich plasma were activated by collagen (2.5 μg/mL). Each anti-β2GP1 antibody demonstrated the inhibition of aggregation compared to negative control, but not to isotype control. No anti-β2GP1 antibody demonstrated LA activity, suggesting they were probably nonpathological. This study highlights both negative and isotype control markers are important to validate the effects of anti-β2GP1 antibodies. Assays to measure anti-domain I-β2GP1 antibodies are recommended to be used in conjunction with functional measures to further investigate the effects of anti-β2GP1 antibodies.
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Affiliation(s)
- Yik C Ho
- 1 School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia
| | - Kiran D K Ahuja
- 1 School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia
| | - Murray J Adams
- 1 School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia.,2 School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, Australia
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16
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Li N, Susanto H, Cemlyn B, Henning ID, Adams MJ. Secure communication systems based on chaos in optically pumped spin-VCSELs. Opt Lett 2017; 42:3494-3497. [PMID: 28957071 DOI: 10.1364/ol.42.003494] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 08/11/2017] [Indexed: 06/07/2023]
Abstract
We report on a master and slave configuration consisting of two optically pumped spin-vertical-cavity surface-emitting lasers for chaos synchronization and secure communication. Under appropriate conditions, high-quality chaos synchronization is achieved. We propose two encryption schemes, where either the pump magnitude or polarization is modulated. The results show that these allow for Gb/s transmission of secure data, but exhibit different features: one indicates that the message can be recovered by the total intensity, but not the polarization components, whereas the other shows that the message can be better or exclusively retrieved from the polarization components at high bit rates.
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17
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Wigmore EM, Clarke TK, Howard DM, Adams MJ, Hall LS, Zeng Y, Gibson J, Davies G, Fernandez-Pujals AM, Thomson PA, Hayward C, Smith BH, Hocking LJ, Padmanabhan S, Deary IJ, Porteous DJ, Nicodemus KK, McIntosh AM. Do regional brain volumes and major depressive disorder share genetic architecture? A study of Generation Scotland (n=19 762), UK Biobank (n=24 048) and the English Longitudinal Study of Ageing (n=5766). Transl Psychiatry 2017; 7:e1205. [PMID: 28809859 PMCID: PMC5611720 DOI: 10.1038/tp.2017.148] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 05/08/2017] [Accepted: 06/07/2017] [Indexed: 12/23/2022] Open
Abstract
Major depressive disorder (MDD) is a heritable and highly debilitating condition. It is commonly associated with subcortical volumetric abnormalities, the most replicated of these being reduced hippocampal volume. Using the most recent published data from Enhancing Neuroimaging Genetics through Meta-analysis (ENIGMA) consortium's genome-wide association study of regional brain volume, we sought to test whether there is shared genetic architecture between seven subcortical brain volumes and intracranial volume (ICV) and MDD. We explored this using linkage disequilibrium score regression, polygenic risk scoring (PRS) techniques, Mendelian randomisation (MR) analysis and BUHMBOX. Utilising summary statistics from ENIGMA and Psychiatric Genomics Consortium, we demonstrated that hippocampal volume was positively genetically correlated with MDD (rG=0.46, P=0.02), although this did not survive multiple comparison testing. None of the other six brain regions studied were genetically correlated and amygdala volume heritability was too low for analysis. Using PRS analysis, no regional volumetric PRS demonstrated a significant association with MDD or recurrent MDD. MR analysis in hippocampal volume and MDD identified no causal association, however, BUHMBOX analysis identified genetic subgrouping in GS:SFHS MDD cases only (P=0.00281). In this study, we provide some evidence that hippocampal volume and MDD may share genetic architecture in a subgroup of individuals, albeit the genetic correlation did not survive multiple testing correction and genetic subgroup heterogeneity was not replicated. In contrast, we found no evidence to support a shared genetic architecture between MDD and other regional subcortical volumes or ICV.
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Affiliation(s)
- E M Wigmore
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK,Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh EH10 5HF, UK. E-mail:
| | - T-K Clarke
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK
| | - D M Howard
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK
| | - M J Adams
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK
| | - L S Hall
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK
| | - Y Zeng
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK
| | - J Gibson
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK
| | - G Davies
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK
| | - A M Fernandez-Pujals
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK
| | - P A Thomson
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK,Centre for Genomic and Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, UK
| | - C Hayward
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, UK
| | - B H Smith
- Division of Population Health Sciences, University of Dundee, Dundee, UK
| | - L J Hocking
- Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - S Padmanabhan
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
| | - I J Deary
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK,Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - D J Porteous
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, UK
| | - K K Nicodemus
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK,Centre for Genomic and Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, UK
| | - A M McIntosh
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, UK,Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK
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18
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Lee AYS, Bannan JL, Adams MJ, Körner H. Erratum to: Expression of CCR6 on B cells in systemic lupus erythematosus patients. Clin Rheumatol 2017; 36:1929. [PMID: 28567554 DOI: 10.1007/s10067-017-3678-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Adrian Y S Lee
- Western Health, Melbourne, Victoria, Australia.,School of Medicine, University of Tasmania, Hobart, Tasmania, Australia
| | - Jennifer L Bannan
- Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool Street, Hobart, Tasmania, 7000, Australia
| | - Murray J Adams
- School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia.,School of Veterinary and Life Sciences, Murdoch University, Perth, Western Australia, Australia
| | - Heinrich Körner
- Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool Street, Hobart, Tasmania, 7000, Australia. .,Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Engineering Technology Research Center of Anti-inflammatory and Immunodrugs in Anhui Province, Institute of Clinical Pharmacology, Anhui Medical University, Hefei, Anhui Province, People's Republic of China.
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19
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Lee AYS, Bannan JL, Adams MJ, Körner H. Expression of CCR6 on B cells in systemic lupus erythematosus patients. Clin Rheumatol 2017; 36:1453-1456. [PMID: 28444576 DOI: 10.1007/s10067-017-3652-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 03/23/2017] [Accepted: 04/18/2017] [Indexed: 11/26/2022]
Abstract
B cells are known to play a dominant pathogenic role in autoimmune conditions such as systemic lupus erythematosus (SLE) and rheumatoid arthritis. In recent times, the chemokine receptor CCR6 and its cognate ligand CCL20 have been shown to play a role in the fundamental kinetics of germinal centres and B cell responses. As CCR6 is found on B cells and is upregulated after activation, we investigated the expression of CCR6 on naive, pre-germinal centre (GC), GC/plasma cell and memory B cells in peripheral B cells of SLE patients and healthy controls using flow cytometry. Pre-germinal centre B cells are found in lower proportions and the expression of CCR6 is increased on B cells of SLE patients, suggesting a role for the chemokine pair in the pathogenesis of the disease. Further studies are needed to explore these preliminary results.
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Affiliation(s)
- Adrian Y S Lee
- Western Health, Melbourne, Victoria, Australia
- School of Medicine, University of Tasmania, Hobart, Tasmania, Australia
| | - Jennifer L Bannan
- Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool Street, Hobart, Tasmania, 7000, Australia
| | - Murray J Adams
- School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia
- School of Veterinary and Life Sciences, Murdoch University, Perth, Western Australia, Australia
| | - Heinrich Körner
- Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool Street, Hobart, Tasmania, 7000, Australia.
- Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Engineering Technology Research Center of Anti-inflammatory and Immunodrugs in Anhui Province, Institute of Clinical Pharmacology, Anhui Medical University, Hefei, Anhui Province, People's Republic of China.
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20
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Torre MS, Susanto H, Li N, Schires K, Salvide MF, Henning ID, Adams MJ, Hurtado A. High frequency continuous birefringence-induced oscillations in spin-polarized vertical-cavity surface-emitting lasers. Opt Lett 2017; 42:1628-1631. [PMID: 28409815 DOI: 10.1364/ol.42.001628] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Sustained, large amplitude and tunable birefringence-induced oscillations are obtained in a spin-vertical cavity surface-emitting laser (spin-VCSEL). Experimental evidence is provided using a spin-VCSEL operating at 1300 nm, under continuous-wave optical pumping and at room temperature. Numerical and stability analyses are performed to interpret the experiments and to identify the combined effects of pump ellipticity, spin relaxation rate, and cavity birefringence. Importantly, the frequency of the induced oscillations is determined by the device's birefringence rate, which can be tuned to very large values. This opens the path for ultrafast spin-lasers operating at record frequencies exceeding those possible in traditional semiconductor lasers and with ample expected impact in disparate disciplines (e.g., datacomms, spectroscopy).
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21
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Navrady LB, Ritchie SJ, Chan SWY, Kerr DM, Adams MJ, Hawkins EH, Porteous D, Deary IJ, Gale CR, Batty GD, McIntosh AM. Intelligence and neuroticism in relation to depression and psychological distress: Evidence from two large population cohorts. Eur Psychiatry 2017; 43:58-65. [PMID: 28365468 PMCID: PMC5486156 DOI: 10.1016/j.eurpsy.2016.12.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 12/23/2016] [Accepted: 12/28/2016] [Indexed: 11/28/2022] Open
Abstract
Background Neuroticism is a risk factor for selected mental and physical illnesses and is inversely associated with intelligence. Intelligence appears to interact with neuroticism and mitigate its detrimental effects on physical health and mortality. However, the inter-relationships of neuroticism and intelligence for major depressive disorder (MDD) and psychological distress has not been well examined. Methods Associations and interactions between neuroticism and general intelligence (g) on MDD, self-reported depression, and psychological distress were examined in two population-based cohorts: Generation Scotland: Scottish Family Health Study (GS:SFHS, n = 19,200) and UK Biobank (n = 90,529). The Eysenck Personality Scale Short Form-Revised measured neuroticism and g was extracted from multiple cognitive ability tests in each cohort. Family structure was adjusted for in GS:SFHS. Results Neuroticism was strongly associated with increased risk for depression and higher psychological distress in both samples. Although intelligence conferred no consistent independent effects on depression, it did increase the risk for depression across samples once neuroticism was adjusted for. Results suggest that higher intelligence may ameliorate the association between neuroticism and self-reported depression although no significant interaction was found for clinical MDD. Intelligence was inversely associated with psychological distress across cohorts. A small interaction was found across samples such that lower psychological distress associates with higher intelligence and lower neuroticism, although effect sizes were small. Conclusions From two large cohort studies, our findings suggest intelligence acts a protective factor in mitigating the effects of neuroticism on psychological distress. Intelligence does not confer protection against diagnosis of depression in those high in neuroticism.
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Affiliation(s)
- L B Navrady
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, EH10 5HF, UK.
| | - S J Ritchie
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK; Department of Psychology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK
| | - S W Y Chan
- Section of Clinical Psychology, University of Edinburgh, Medical Quad, Teviot Place, Edinburgh, EH8 9AG, UK
| | - D M Kerr
- NHS Greater Glasgow and Clyde, 1055 Great Western Road, Glasgow, G12 0XH, UK
| | - M J Adams
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, EH10 5HF, UK
| | - E H Hawkins
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, EH10 5HF, UK
| | - D Porteous
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK; Medical Genetics Section, Centre for Genetics and Experimental Medicine, Institute for Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK; Generation Scotland, Centre for Genetics and Experimental Medicine, Institute for Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
| | - I J Deary
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK; Department of Psychology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK; Generation Scotland, Centre for Genetics and Experimental Medicine, Institute for Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
| | - C R Gale
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK; MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton, SO16 6YD, UK
| | - G D Batty
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK; Department of Epidemiology and Public Health, University College London, 1-19 Torrington Place, London, WC1E 6BT, UK; Alzheimer Scotland Dementia Research Centre, Department of Psychology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK
| | - A M McIntosh
- Division of Psychiatry, University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, EH10 5HF, UK; Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, 7, George Square, Edinburgh, EH8 9JZ, UK; Generation Scotland, Centre for Genetics and Experimental Medicine, Institute for Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
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22
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Omari SA, Adams MJ, Geraghty DP. TRPV1 Channels in Immune Cells and Hematological Malignancies. Advances in Pharmacology 2017; 79:173-198. [DOI: 10.1016/bs.apha.2017.01.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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23
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Nikolic SB, Edwards LM, Karpievitch YV, Wilson R, Horne J, Adams MJ, Sharman JE. Serum metabolic profile predicts adverse central haemodynamics in patients with type 2 diabetes mellitus. Acta Diabetol 2016; 53:367-75. [PMID: 26338006 DOI: 10.1007/s00592-015-0802-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 07/24/2015] [Indexed: 01/19/2023]
Abstract
AIMS People with type 2 diabetes mellitus (T2DM) have abnormal peripheral and central haemodynamics at rest and during exercise, probably due to metabolic perturbations, but mechanisms are unknown. We used untargeted metabolomics to determine the relationships between metabolic perturbations and haemodynamics (peripheral and central) measured at rest and during exercise. METHODS Serum samples from 39 participants with T2DM (62 ± 9 years; 46 % male) and 39 controls (52 ± 10 years; 51 % male) were analysed by liquid chromatography-mass spectrometry, nuclear magnetic resonance spectroscopy and principal component analysis. Scores on principal components (PC) were used to assess relationships with haemodynamics including peripheral and central BP, central augmentation index (AIx) and central augmentation pressure (AP). RESULTS Participants with T2DM had higher resting and exercise haemodynamics (peripheral and central BP, central AIx and central AP) compared to controls (p < 0.05). PC that comprised of a signature metabolic pattern of T2DM was independently associated with resting and exercise central AIx and central AP (p < 0.05). CONCLUSIONS Serum metabolic profile was associated with central, but not peripheral, haemodynamics in T2DM participants, suggesting that metabolic irregularities may explain abnormal central haemodynamics in T2DM patients.
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Affiliation(s)
- Sonja B Nikolic
- Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool Street, Hobart, 7000, Australia
| | - Lindsay M Edwards
- Centre of Human and Aerospace Physiological Sciences, King's College London, London, UK.
- Fibrosis Discovery Performance Unit, GSK Medicines Research Centre, GlaxoSmithKline R&D, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, UK.
| | | | - Richard Wilson
- Central Science Laboratory, University of Tasmania, Hobart, Australia
| | - James Horne
- Central Science Laboratory, University of Tasmania, Hobart, Australia
| | - Murray J Adams
- School of Health Sciences, University of Tasmania, Launceston, Australia
| | - James E Sharman
- Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool Street, Hobart, 7000, Australia.
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24
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Ho YC, Ahuja KDK, Körner H, Adams MJ. β 2GP1, Anti-β 2GP1 Antibodies and Platelets: Key Players in the Antiphospholipid Syndrome. Antibodies (Basel) 2016; 5:E12. [PMID: 31557993 PMCID: PMC6698853 DOI: 10.3390/antib5020012] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 04/26/2016] [Accepted: 04/26/2016] [Indexed: 12/21/2022] Open
Abstract
Anti-beta 2 glycoprotein 1 (anti-β2GP1) antibodies are commonly found in patients with autoimmune diseases such as the antiphospholipid syndrome (APS) and systemic lupus erythematosus (SLE). Their presence is highly associated with increased risk of vascular thrombosis and/or recurrent pregnancy-related complications. Although they are a subtype of anti-phospholipid (APL) antibody, anti-β2GP1 antibodies form complexes with β2GP1 before binding to different receptors associated with anionic phospholipids on structures such as platelets and endothelial cells. β2GP1 consists of five short consensus repeat termed "sushi" domains. It has three interchangeable conformations with a cryptic epitope at domain 1 within the molecule. Anti-β2GP1 antibodies against this cryptic epitope are referred to as 'type A' antibodies, and have been suggested to be more strongly associated with both vascular and obstetric complications. In contrast, 'type B' antibodies, directed against other domains of β2GP1, are more likely to be benign antibodies found in asymptomatic patients and healthy individuals. Although the interactions between anti-β2GP1 antibodies, β2GP1, and platelets have been investigated, the actual targeted metabolic pathway(s) and/or receptor(s) involved remain to be clearly elucidated. This review will discuss the current understanding of the interaction between anti-β2GP1 antibodies and β2GP1, with platelet receptors and associated signalling pathways.
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Affiliation(s)
- Yik C Ho
- School of Health Sciences, University of Tasmania, Locked Bag 1322, Launceston, Tasmania 7250, Australia.
| | - Kiran D K Ahuja
- School of Health Sciences, University of Tasmania, Locked Bag 1322, Launceston, Tasmania 7250, Australia.
| | - Heinrich Körner
- Menzies Institute for Medical Research, University of Tasmania, Private Bag 23, Hobart, Tasmania 7001, Australia.
| | - Murray J Adams
- School of Health Sciences, University of Tasmania, Locked Bag 1322, Launceston, Tasmania 7250, Australia.
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Omari SA, Adams MJ, Kunde DA, Geraghty DP. Capsaicin-Induced Death of Human Haematological Malignant Cell Lines Is Independent of TRPV1 Activation. Pharmacology 2016; 98:79-86. [PMID: 27160991 DOI: 10.1159/000445437] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 03/10/2016] [Indexed: 11/19/2022]
Abstract
The effect of the plant-derived vanilloid, capsaicin (CAP), on the metabolic activity of THP-1, U266B1 and U937 hematological malignancy cells was determined. CAP reduced metabolic activity in a concentration-dependent manner in the three cell lines. A biphasic effect was observed on THP-1 cells (EC50: IC50 (95% CI) 32.9 (19.9-54.3)/219 (144-246) µmol/l). U266B1 cells were more resistant to CAP than THP-1 and U937. Metabolic activity was significantly inhibited by CAP in U937 compared to U266B1 cells (IC50: 197 versus 431 µmol/l, respectively, p < 0.008). Transient receptor potential vanilloid-1 (TRPV1) and CB1 antagonists (SB452533 and AM251, respectively) suppressed the CAP-induced increase in THP-1 cell metabolic activity (p < 0.001). AM251 and SB452533 appeared to act as partial agonists and displayed a synergistic effect with CAP in U937 cells. CAP inhibits the metabolic activity of malignant hematological cells through non-TRPV1-dependent mechanisms.
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Affiliation(s)
- Sofia A Omari
- School of Health Sciences, University of Tasmania, Launceston, Australia
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Abstract
A database and website ( http://www.ictvonline.org/taxonomyReleases.asp ) have been established where the history of changes in virus taxonomy from 1971 to the present day can easily be traced. Each change is linked to a source document confirming the change or, for most changes since 2002, to the taxonomic proposal approved by the International Committee on Taxonomy of Viruses (ICTV).
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Affiliation(s)
- M J Adams
- , 24 Woodland Way, Stevenage, Herts, SG2 8BT, UK,
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Nikolic SB, Adams MJ, Otahal P, Edwards LM, Sharman JE. Association of von Willebrand factor blood levels with exercise hypertension. Eur J Appl Physiol 2014; 115:1057-65. [PMID: 25539599 DOI: 10.1007/s00421-014-3087-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 12/16/2014] [Indexed: 11/24/2022]
Abstract
PURPOSE A hypertensive response to moderate intensity exercise (HRE) is associated with increased cardiovascular risk. The mechanisms of an HRE are unclear, although previous studies suggest this may be due to haemostatic and/or haemodynamic factors. We investigated the relationships between an HRE with haemostatic and hemodynamic indices. METHODS Sixty-four participants (57 ± 10 years, 71 % male) with indication for exercise stress testing underwent cardiovascular assessment at rest and during moderate intensity exercise, from which 20 participants developed an HRE (defined as moderate exercise systolic BP ≥ 170 mmHg/men and ≥ 160 mmHg/women). Rest, exercise and post-exercise blood samples were analysed for haemostatic markers, including von Willebrand factor (vWf), and haemodynamic measures of brachial and central blood pressure (BP), aortic stiffness and systemic vascular resistance index (SVRi). RESULTS HRE participants had higher rest vWf compared with normotensive response to exercise (NRE) participants (1,927 mU/mL, 95 % CI 1,240-2,615, vs. 1,129 mU/mL, 95 % CI 871-1,386; p = 0.016). vWf levels significantly decreased from rest to post-exercise in HRE participants (p = 0.005), whereas vWf levels significantly increased from rest to exercise in NRE participants (p = 0.030). HRE participants also had increased triglycerides, rest BP, aortic stiffness and exercise SVRi (p < 0.05 for all). Rest vWf predicted exercise brachial systolic BP (β = 0.220, p = 0.043; adjusted R (2) = 0.451, p < 0.001) independent of age, sex, body mass index, triglycerides, rest brachial systolic BP and aortic stiffness. CONCLUSIONS Increased rest blood levels of vWf are independently associated with moderate intensity exercise systolic BP. These findings implicate abnormalities in haemostasis as a possible factor contributing to HRE at moderate intensity.
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Affiliation(s)
- Sonja B Nikolic
- Menzies Institute for Medical Research, University of Tasmania, 17 Liverpool Street, Hobart, 7000, Australia
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Abstract
Tissue factor pathway inhibitor (TFPI) is the major physiological regulator of tissue factor (TF)-induced blood coagulation. TFPI inhibits the TF-activated factor VII (FVIIa) complex in an activated factor X (FXa)-dependent manner, helping to control thrombin generation and ultimately fibrin formation. The importance of TFPI is demonstrated in models of hemophilia where lower levels of FVIII or FIX are insufficient to overcome its inhibitory effect, resulting in a bleeding phenotype. There are two major isoforms in vivo; TFPIα contains three Kunitz-type inhibitory domains (designated K1, K2, and K3), is secreted by endothelial cells and requires protein S to enhance its anticoagulant activity. In contrast, TFPIβ contains only the K1 and K2 domains, but it is attached to the endothelial surface via a glycosylphosphatidylinositol anchor. This review will initially provide a brief history of the major discoveries related to TFPI, and then discuss new insights into the physiology of TFPI, including updates on its association with protein S and FV, as well as the current understanding of its association with disease.
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Affiliation(s)
- Paul E R Ellery
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, Wisconsin
| | - Murray J Adams
- School of Health Sciences, University of Tasmania, Launceston, Tasmania, Australia
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Adams MJ, Carstens EB. Changes to the Statutes and Subcommittees of the International Committee on Taxonomy of Viruses (2014). Arch Virol 2014; 159:2829-30. [PMID: 24906527 DOI: 10.1007/s00705-014-2145-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 05/30/2014] [Indexed: 10/25/2022]
Affiliation(s)
- M J Adams
- , 24 Woodland Way, Stevenage, Herts, SG2 8BT, UK,
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Almaghrabi SY, Geraghty DP, Ahuja KDK, Adams MJ. Vanilloid-like agents inhibit aggregation of human platelets. Thromb Res 2014; 134:412-7. [PMID: 24953906 DOI: 10.1016/j.thromres.2014.05.038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 05/02/2014] [Accepted: 05/30/2014] [Indexed: 11/26/2022]
Abstract
INTRODUCTION Plant-derived and endogenous vanilloid-like agents exert their effects on cells through transient receptor potential vanilloid-1 (TRPV1). Little is known about the effects of these agents on platelet aggregation. We investigated the effect of various vanilloid-like agents on in-vitro platelet aggregation and tested whether this action is mediated through TRPV1. Understanding the mechanism of action of these compounds in platelets is important in that these compounds may be developed as novel anti-platelet agents. MATERIALS AND METHODS The effects of plant-derived (capsaicin; dihydrocapsaicin, DHC) and endogenous vanilloid-like agents (N-oleoyldopamine, OLDA; N-arachidonoyl-dopamine, NADA) on platelet aggregation were investigated using ADP (5, 10μM), collagen (4, 8μg/mL) and arachidonic acid (AA, 300, 400μg/mL) as agonists. The direct effects of these agents on platelet viability were also determined using an LDH release assay. RESULTS Capsaicin, OLDA and NADA inhibited ADP-induced platelet aggregation in a concentration-dependent manner. OLDA and NADA, but not capsaicin and DHC, inhibited collagen-induced aggregation, whereas AA-induced aggregation was inhibited by capsaicin, DHC and NADA, but not OLDA. Inhibition of aggregation was not due to direct toxicity of these agents towards platelets. The TRPV1 antagonist, SB-452533, did not affect inhibition of ADP-induced platelet aggregation by capsaicin and OLDA. CONCLUSIONS These results demonstrate that the endovanilloids, OLDA and NADA, and plant-derived vanilloid, capsaicin, inhibit ADP-induced platelet aggregation. Collagen-induced aggregation was inhibited only by endovanilloids, whereas AA-induced aggregation was inhibited by capsaicin, DHC and NADA. This inhibition was not due to direct toxic effects of these agents, nor was inhibition of ADP-induced aggregation TRPV1 mediated.
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Affiliation(s)
- Safa Y Almaghrabi
- School of Health Sciences, University of Tasmania, Bag 1320 Launceston, Tasmania, 7250, Australia
| | - Dominic P Geraghty
- School of Health Sciences, University of Tasmania, Bag 1320 Launceston, Tasmania, 7250, Australia
| | - Kiran D K Ahuja
- School of Health Sciences, University of Tasmania, Bag 1320 Launceston, Tasmania, 7250, Australia
| | - Murray J Adams
- School of Health Sciences, University of Tasmania, Bag 1320 Launceston, Tasmania, 7250, Australia.
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Affiliation(s)
- Murray J. Adams
- School of Human Life Sciences; University of Tasmania; Bag 1320 Launceston; Tasmania; 7250; Australia
| | - Safa Y. Almaghrabi
- School of Human Life Sciences; University of Tasmania; Bag 1320 Launceston; Tasmania; 7250; Australia
| | - Kiran D. K. Ahuja
- School of Human Life Sciences; University of Tasmania; Bag 1320 Launceston; Tasmania; 7250; Australia
| | - Dominic P. Geraghty
- School of Human Life Sciences; University of Tasmania; Bag 1320 Launceston; Tasmania; 7250; Australia
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Sun BJ, Sun LY, Tugume AK, Adams MJ, Yang J, Xie LH, Chen JP. Selection pressure and founder effects constrain genetic variation in differentiated populations of soilborne bymovirus Wheat yellow mosaic virus (Potyviridae) in China. Phytopathology 2013; 103:949-59. [PMID: 23550972 DOI: 10.1094/phyto-01-13-0013-r] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
To study the population genetic structure and forces driving the evolution of Wheat yellow mosaic virus (WYMV), the nucleotide sequences encoding the coat protein (CP) (297 sequences) or the genome-linked virion protein (VPg) (87 sequences) were determined from wheat plants growing at 11 different locations distributed in five provinces in China. There were close phylogenetic relationships between all sequences but clustering on the phylogenetic trees was congruent with their provenance, suggesting an origin-dependent population genetic structure. There were low levels of genetic diversity, ranging from 0.00035 ± 0.00019 to 0.01536 ± 0.00043 (CP), and 0.00086 ± 0.00039 to 0.00573 ± 0.00111 (VPg), indicating genetic stability or recent emergence of WYMV in China. The results may suggest that founder effects play a role in shaping the genetic structure of WYMV. Between-population diversity was consistently higher than within-population diversity, suggesting limited gene flow between subpopulations (average FST 0.6241 for the CP and 0.7981 for the VPg). Consistent amino acid substitutions correlated with the provenance of the sequences were observed at nine positions in the CP (but none in the VPg), indicating an advanced stage in population structuring. Strong negative (purifying) selection was implicated on both the CP and VPg but positive selection on a few codons in the CP, indicating an ongoing molecular adaptation.
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Affiliation(s)
- B-J Sun
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, MoA Key Laboratory for Plant Protection and Biotechnology, Zhejiang Provincial Key Laboratory of Plant Virology, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
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Adams MJ, Lefkowitz EJ, King AMQ, Carstens EB. Recently agreed changes to the International Code of Virus Classification and Nomenclature. Arch Virol 2013; 158:2633-9. [PMID: 23836393 DOI: 10.1007/s00705-013-1749-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 04/25/2013] [Indexed: 10/26/2022]
Affiliation(s)
- M J Adams
- Rothamsted Research, Harpenden, Herts, AL5 2JQ, UK,
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Hopkins WD, Adams MJ, Weiss A. Genetic and environmental contributions to the expression of handedness in chimpanzees (Pan troglodytes). Genes Brain Behav 2013; 12:446-52. [PMID: 23615127 PMCID: PMC3672364 DOI: 10.1111/gbb.12044] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 04/04/2013] [Accepted: 04/22/2013] [Indexed: 12/25/2022]
Abstract
Most humans are right-handed and, like many behavioral traits, there is good evidence that genetic factors play a role in handedness. Many researchers have argued that non-human animal limb or hand preferences are not under genetic control but instead are determined by random, non-genetic factors. We used quantitative genetic analyses to estimate the genetic and environmental contributions to three measures of chimpanzee handedness. Results revealed significant population-level handedness for two of the three measures-the tube task and manual gestures. Furthermore, significant additive genetic effects for the direction and strength of handedness were found for all three measures, with some modulation due to early social rearing experiences. These findings challenge historical and contemporary views of the mechanisms underlying handedness in non-human animals.
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Affiliation(s)
- W D Hopkins
- Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, GA 30322, USA.
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Adams MJ, King AMQ, Carstens EB. Ratification vote on taxonomic proposals to the International Committee on Taxonomy of Viruses (2013). Arch Virol 2013; 158:2023-30. [PMID: 23580178 DOI: 10.1007/s00705-013-1688-5] [Citation(s) in RCA: 170] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Accepted: 02/22/2013] [Indexed: 12/13/2022]
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Abstract
Systemic lupus erythematosus (SLE) is a chronic inflammatory autoimmune disease that can affect any part of the body, including the skin, liver, kidneys, and blood. Thrombosis is a frequent manifestation in SLE, contributing significantly to patient morbidity and mortality, although the precise mechanism(s) of how this occurs remains unclear. Fibrinolysis is the physiologic process of thrombus digestion and provides an important balance to hemostasis. This process is triggered upon vessel injury with the release of tissue-type plasminogen activator (t-PA) from endothelial cells. The central component of the fibrinolytic pathway is plasminogen, a zymogen that is converted to plasmin by t-PA. Plasminogen/plasmin is absorbed into the developing thrombus and digests fibrinogen and fibrin within the hemostatic plug to prevent excessive clot formation. Abnormalities of the fibrinolytic pathway are associated either with the development of thrombosis (impaired fibrinolysis) or, to a lesser extent, bleeding (excessive fibrinolysis). Indeed, impaired fibrinolysis has been reported in patients with SLE and may contribute to both the development of hypercoagulability and an increased risk of thrombosis. Here we discuss the role of impaired fibrinolysis and its contribution to hypercoagulability and thrombosis in SLE.
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Kakinami L, Block RC, Adams MJ, Cohn SE, Maliakkal B, Fisher SG. Risk of cardiovascular disease in HIV, hepatitis C, or HIV/hepatitis C patients compared to the general population. Int J Clin Pract 2013; 67:6-13. [PMID: 23241046 PMCID: PMC3533243 DOI: 10.1111/j.1742-1241.2012.02953.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND As a result of effective antiretroviral therapy HIV patients are living longer, and their risk of cardiovascular disease (CVD) is a growing concern. It remains unknown whether coinfection with hepatitis C (HCV) changes an HIV person's CVD risk, and how the risks compare to the general population. The objective of this study was to compare the Framingham Risk Score (FRS) and vascular age differences in persons with HIV, HCV or HIV/HCV disease to the general population. METHODS HIV, HCV, and HIV/HCV patients with clinic visits between 2004 and 2009 were sampled from medical clinics in Rochester, NY. Uninfected persons were randomly selected from the National Health and Nutrition Examination Survey (NHANES), and individually matched on gender, race, and age. We stratified by infection group and conducted separate multivariable linear regression analyses between each infection group and the gender, race, and age matched participants from NHANES. RESULTS Rochester patients (HIV = 239, HCV = 167, HIV/HCV = 182) were compared 3 : 1 with the NHANES participants. After controlling for weight, marital status, current pharmacotherapies and the matching variables of gender, race, and age, HIV/HCV patients had a 2% higher general FRS compared with the general population (p = 0.03), and vascular age differences that were 4.1 years greater (p = .01). HCV patients had a 2.4% higher general FRS than the general population (p < .001), and vascular age differences that were 4.4 years greater (p < .001). CVD risk was elevated but not significantly different between HIV patients and the general population. CONCLUSION Cardiovascular disease risk is elevated among HIV/HCV and HCV infected persons compared with the general population.
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Affiliation(s)
- L Kakinami
- Department of Community and Preventive Medicine, University of Rochester, Rochester, NY, USA.
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King SG, Ahuja KDK, Wass J, Shing CM, Adams MJ, Davies JE, Sharman JE, Williams AD. Effect of whole-body mild-cold exposure on arterial stiffness and central haemodynamics: a randomised, cross-over trial in healthy men and women. Eur J Appl Physiol 2012; 113:1257-69. [DOI: 10.1007/s00421-012-2543-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 10/31/2012] [Indexed: 01/23/2023]
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Toomey JP, Nichkawde C, Kane DM, Schires K, Henning ID, Hurtado A, Adams MJ. Stability of the nonlinear dynamics of an optically injected VCSEL. Opt Express 2012; 20:10256-10270. [PMID: 22535116 DOI: 10.1364/oe.20.010256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Automated protocols have been developed to characterize time series data in terms of stability. These techniques are applied to the output power time series of an optically injected vertical cavity surface emitting laser (VCSEL) subject to varying injection strength and optical frequency detuning between master and slave lasers. Dynamic maps, generated from high resolution, computer controlled experiments, identify regions of dynamic instability in the parameter space.
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Affiliation(s)
- J P Toomey
- Department of Physics and Astronomy, Macquarie University, Sydney NSW 2109 Australia.
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Adams MJ, Palatinus AA, Harvey AM, Khalafallah AA. Impaired control of the tissue factor pathway of blood coagulation in systemic lupus erythematosus. Lupus 2011; 20:1474-83. [DOI: 10.1177/0961203311418267] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Thrombosis is a frequent manifestation in patients with systemic lupus erythematosus (SLE), although precise mechanisms remain unclear. This study investigated whether the major physiological trigger of blood coagulation, the tissue factor (TF) pathway, was altered in SLE patients. Furthermore, we investigated potential associations between the TF pathway, the presence of antiphospholipid (APL) antibodies and other abnormalities present in SLE. A total of 101 participants (40 SLE patients and 61 age- and sex-matched controls) were recruited from Tasmania, Australia. Markers of the TF pathway, hypercoagulability, inflammation and endothelial cell damage were measured in plasma. Serum levels of APL antibodies (anti-cardiolipin antibodies [ACL], lupus anticoagulants [LAC], anti-beta2-glycoprotein-1 [anti-β2GP1] and anti-prothrombin antibodies) were also determined. Despite similar TF and TF pathway inhibitor (TFPI) total antigen levels, SLE patients had significantly increased levels of TFPI free antigen (patients vs controls; mean ± SD) (11.6 ± 0.9 ng/mL vs 6.4 ± 0.4 ng/mL; p < 0.001) but significantly reduced TFPI activity (0.66 ± 0.07 U/mL vs 1.22 ± 0.03 U/mL; p < 0.001), compared with healthy controls. Anti-TFPI activity, designated as the ability of isolated IgG fractions to inhibit TFPI activity in normal plasma, was detected in 19/40 (47.5%) of SLE patients and 3/40 (7.5%) of healthy controls. The significant reduction in TFPI activity in SLE patients reflects impaired functional control of the TF pathway. Moreover, SLE patients with a history of thrombosis demonstrated higher levels of TFPI activity compared with patients without a previous thrombotic event (0.97 ± 0.07 U/mL vs 0.53 ± 0.14 U/mL; p = 0.0026). Changes to the TF pathway were not associated with manifestations of SLE such as inflammation or endothelial cell damage. The results from this study suggest hypercoagulability in SLE may (in part) be due to reduced TFPI activity, a mechanism that appears to be independent of other abnormalities in SLE.
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Affiliation(s)
- MJ Adams
- School of Human Life Sciences, University of Tasmania, Launceston, TAS, Australia
| | - AA Palatinus
- School of Human Life Sciences, University of Tasmania, Launceston, TAS, Australia
| | - AM Harvey
- School of Human Life Sciences, University of Tasmania, Launceston, TAS, Australia
| | - AA Khalafallah
- School of Human Life Sciences, University of Tasmania, Launceston, TAS, Australia
- Haematology Research Unit, Pathology Department, Launceston General Hospital, Launceston, TAS, Australia
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Abstract
Antiphospholipid antibodies contribute to the development of thrombosis, although precise mechanisms remain to be elucidated. We determined the effects of affinity-purified anti-beta(2)-glycoprotein 1 (anti-β(2)GP1) and anti-prothrombin (anti-PT) antibodies on in vitro platelet aggregation. Adenosine diphosphate (ADP) and collagen-induced platelet aggregation were performed using platelet-rich plasma ([PRP] 250 × 10(9)/L). Antiphospholipid antibodies (1.25-10 μg/mL) were preincubated with PRP for 10 minutes at 37°C prior to the addition of agonist. Anti-β(2)GP1 antibodies significantly reduced platelet aggregation (percentage area under the curve; %AUC) in a concentration-dependent manner using both 5 μmol/L (P < .001) and 2.5 μmol/L (P = .038) ADP but did not significantly affect the rate of aggregation. Anti-PT antibodies significantly enhanced 5 µg/mL collagen-induced platelet aggregation (%AUC; P = .034) but did not affect ADP-induced platelet aggregation. These results suggest (1) interactions and effects of antiphospholipid antibodies on platelets are agonist and concentration dependent and (2) anti-β(2)GP1 antibodies may inhibit dense granule release and/or inhibition of the arachidonic acid pathway.
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Affiliation(s)
- Anita A Palatinus
- School of Human Life Sciences, University of Tasmania, Launceston, Tasmania, Australia
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Geraghty DP, Ahuja KDK, Pittaway J, Shing C, Jacobson GA, Jager N, Jurković S, Narkowicz C, Saunders CI, Ball M, Pinkard A, Vennavaram RR, Adams MJ. In vitro antioxidant, antiplatelet and anti-inflammatory activity of Carpobrotus rossii (pigface) extract. J Ethnopharmacol 2011; 134:97-103. [PMID: 21130860 DOI: 10.1016/j.jep.2010.11.060] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Revised: 11/13/2010] [Accepted: 11/25/2010] [Indexed: 05/26/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Carpobrotus rossii (CR) has a history of use as a food and therapeutic agent by Australian indigenous peoples and early European settlers and is believed to contain a number of pharmacologically active polyphenolic compounds. AIMS OF THE STUDY Oxidation of low density lipoprotein (LDL), platelet aggregation, and inflammation contribute to the development and progression of atherosclerosis. The aim of the present study was to investigate the antioxidant, antiplatelet and anti-inflammatory activity of CR extract using human blood components. MATERIALS AND METHODS An assay employing in vitro copper-induced oxidation of serum lipids was used to assess antioxidant activity of CR extract (and tannin, flavonoid and pre- and post-flavonoid fractions). The effects of CR extract on ADP- and collagen-induced platelet aggregation, and on basal (unstimulated) and lipopolysaccharide (LPS)- and phytohaemagglutinin A (PHA)-stimulated cytokine release from peripheral blood mononuclear cells (PBMC) were also investigated. RESULTS CR extract increased the lag time of serum oxidation (maximum of ∼4-fold at 20μg/ml) in a concentration-dependent manner. The antioxidant activity resided only in the tannin and post-flavonoid fractions. CR had no effect on ADP-induced platelet aggregation, but significantly decreased collagen-induced platelet aggregation. LPS, but not PHA, significantly increased the release of IL-1β and TNF-α from PBMC. CR extract alone inhibited monocyte chemoattractant protein (MCP)-1 release and in the presence of LPS, inhibited IL-10, TNF-α and MCP-1 release compared to LPS alone. CONCLUSION CR has significant in vitro antioxidant, antiplatelet and, potentially, anti-inflammatory activity.
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Affiliation(s)
- Dominic P Geraghty
- School of Human Life Sciences, University of Tasmania, Locked Bag 1320, Launceston, Tasmania 7250, Australia.
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Shing CM, Adams MJ, Fassett RG, Coombes JS. Nutritional compounds influence tissue factor expression and inflammation of chronic kidney disease patients in vitro. Nutrition 2011; 27:967-72. [PMID: 21295946 DOI: 10.1016/j.nut.2010.10.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 08/17/2010] [Accepted: 10/06/2010] [Indexed: 11/24/2022]
Abstract
OBJECTIVE Nutritional compounds that potentially limit inflammation and tissue factor expression may decrease the progression of chronic kidney disease (CKD) and associated cardiovascular disease. This project aimed to determine the effect of curcumin, bovine colostrum, and fish oil on inflammatory cytokine and tissue factor procoagulant activity of peripheral blood mononuclear cells (PBMCs) from patients with CKD before dialysis. METHODS Peripheral blood mononuclear cells from patients with CKD before dialysis (n = 13) and age- and sex-matched healthy controls (n = 12) were cultured alone and with low and high doses of the nutritional compounds for 24 h. Cells were cultured with and without lipopolysaccharide. Supernatants were analyzed for tumor necrosis factor-α, interleukin (IL)-6, IL-8, monocyte chemoattractant protein-1, IL-1β, C-reactive protein, and tissue factor procoagulant activity. RESULTS The production of C-reactive protein, monocyte chemoattractant protein-1, IL-6, and IL-1β by PBMCs was inhibited by low- and high-dose fish oil in the CKD group (P < 0.05). Curcumin decreased secretion of IL-6 (P = 0.015) and IL-1 β (P = 0.016). Curcumin was more effective than colostrum at decreasing the procoagulant activity of PBMCs in the CKD and control groups (P < 0.019). CONCLUSION Fish oil decreased inflammatory cytokine secretion from CKD PBMCs. In addition, the beneficial effects of curcumin were demonstrated in decreasing inflammation in vitro, often to a similar magnitude as fish oil.
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Affiliation(s)
- Cecilia M Shing
- School of Human Life Sciences, University of Tasmania, Launceston, Australia.
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Wilson AJ, Morrissey MB, Adams MJ, Walling CA, Guinness FE, Pemberton JM, Clutton-Brock TH, Kruuk LEB. Indirect genetics effects and evolutionary constraint: an analysis of social dominance in red deer, Cervus elaphus. J Evol Biol 2011; 24:772-83. [PMID: 21288272 DOI: 10.1111/j.1420-9101.2010.02212.x] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By determining access to limited resources, social dominance is often an important determinant of fitness. Thus, if heritable, standard theory predicts mean dominance should evolve. However, dominance is usually inferred from the tendency to win contests, and given one winner and one loser in any dyadic contest, the mean proportion won will always equal 0.5. Here, we argue that the apparent conflict between quantitative genetic theory and common sense is resolved by recognition of indirect genetic effects (IGEs). We estimate selection on, and genetic (co)variance structures for, social dominance, in a wild population of red deer Cervus elaphus, on the Scottish island of Rum. While dominance is heritable and positively correlated with lifetime fitness, contest outcomes depend as much on the genes carried by an opponent as on the genotype of a focal individual. We show how this dependency imposes an absolute evolutionary constraint on the phenotypic mean, thus reconciling theoretical predictions with common sense. More generally, we argue that IGEs likely provide a widespread but poorly recognized source of evolutionary constraint for traits influenced by competition.
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Affiliation(s)
- A J Wilson
- Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Edinburgh, UK.
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Adams MJ, Hurtado A, Labukhin D, Henning ID. Nonlinear semiconductor lasers and amplifiers for all-optical information processing. Chaos 2010; 20:037102. [PMID: 20887068 DOI: 10.1063/1.3491096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The nonlinear properties of semiconductor lasers and laser amplifiers when subject to optical injection are reviewed and new results are presented for multisection lasers, vertical cavity semiconductor optical amplifiers, and surface-emitting lasers. The main underlying material parameters are outlined and the key design approaches are discussed for both edge-emitting and vertical cavity devices. An overview of theoretical modeling approaches is discussed and a summary of key experimental results is presented. The practical use of optically injected edge-emitting and vertical cavity semiconductor lasers and laser amplifiers is illustrated with examples of applications including, among others, optical logic and chaotic communication.
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Affiliation(s)
- M J Adams
- School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom
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Adams MJ, Ahuja KD, Geraghty DP. Effect of capsaicin and dihydrocapsaicin on in vitro blood coagulation and platelet aggregation. Thromb Res 2009; 124:721-3. [DOI: 10.1016/j.thromres.2009.05.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Revised: 05/01/2009] [Accepted: 05/03/2009] [Indexed: 10/20/2022]
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Dalury DF, Mason JB, Murphy JA, Adams MJ. Analysis of the outcome in male and female patients using a unisex total knee replacement system. ACTA ACUST UNITED AC 2009; 91:357-60. [PMID: 19258612 DOI: 10.1302/0301-620x.91b3.21771] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Gender-specific total knee replacement has generated much interest recently. We reviewed 1970 Sigma knees implanted in 920 women and 592 men with a mean age of 69.7 years. At a mean follow-up of 7.3 years (minimum, five years), we found minimal differences in the outcome between genders. At the final follow-up, men had a higher overall Knee Society score and more osteolysis (3.8% vs 1.1%). However, there were no significant differences between men and women in terms of complications or improvements in knee function, pain score or range of movement. The estimated ten-year survivorship was 97% in women and 98% in men (p = 0.96). We concluded that there was little difference in outcome between the genders treated by a modern unisex design of total knee replacement in this large multicentre study.
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Affiliation(s)
- D F Dalury
- St. Joseph Medical Center, Baltimore, Maryland, USA.
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Vaughan MP, Henning I, Adams MJ, Rivers LJ, Cannard P, Lealman IF. Mutual optical injection in coupled DBR laser pairs. Opt Express 2009; 17:2033-2041. [PMID: 19189034 DOI: 10.1364/oe.17.002033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report an experimental study of nonlinear effects, characteristic of mutual optical coupling, in an ultra-short coupling regime observed in a distributed Bragg reflector laser pair fabricated on the same chip. Optical feedback is amplified via a double pass through a common on-chip optical amplifier, which introduces further nonlinear phenomena. Optical coupling has been introduced via back reflection from a cleave-ended fibre. The coupling may be varied in strength by varying the distance of the fibre from the output of the chip, without significantly affecting the coupling time.
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Affiliation(s)
- M P Vaughan
- School of Computer Science and Electronic Engineering, University of Essex, Colchester, UK
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Wang HD, Chen JP, Zhang HM, Sun XL, Zhu JL, Wang AG, Sheng WX, Adams MJ. Recent Rice stripe virus Epidemics in Zhejiang Province, China, and Experiments on Sowing Date, Disease-Yield Loss Relationships, and Seedling Susceptibility. Plant Dis 2008; 92:1190-1196. [PMID: 30769483 DOI: 10.1094/pdis-92-8-1190] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Rice stripe virus, transmitted by the small brown planthopper Laodelphax striatellus, has recently reemerged as a major disease in Zhejiang province, eastern China. Intensive surveys during 2003 to 2006 demonstrated how the disease has spread rapidly from the northern to central and eastern regions with increasing incidence each year. In bioassays, the highest proportions of viruliferous vectors were from regions where the disease was most severe. The greatest disease incidence was in the earliest sown plants, and substantial control could be achieved by delaying planting from late May to mid-June. In experiments where different proportions of infected plants were established (by inoculation or varying the sowing date), average yield losses were 0.8% for every 1% increase in disease incidence. In inoculation experiments, young seedlings, particularly those at the three- to five-leaf stage, were the most susceptible, whereas ≤1% of plants inoculated at or after the elongation stage developed symptoms. Recent epidemics appear to have resulted from large populations of viruliferous vectors colonizing rice seedlings at the most susceptible stage. This is probably because of changes in cropping practice, recent warmer winters in Zhejiang province, and the development of resistance or tolerance to the insecticides widely used (triazophos, synthetic pyrethroids, and Imidacloprid).
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Affiliation(s)
- H-D Wang
- Zhejiang Provincial Station of Plant Protection and Plant Quarantine, Hangzhou, 310020, P.R. China
| | - J-P Chen
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R. China
| | - H-M Zhang
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R. China
| | - X-L Sun
- Jiangxing Academy of Agricultural Sciences, Jiangxing 314000, P.R. China
| | - J-L Zhu
- Jiangxing Station of Pest and Disease Monitoring, Jiangxing 314050, P.R. China
| | - A-G Wang
- Linghai Station of Plant Protection, Taizhou 317000, P.R. China
| | - W-X Sheng
- Huzhou Academy of Agricultural Sciences, Huzhou 313000, P.R. China
| | - M J Adams
- Department of Plant Pathology and Microbiology, Rothamsted Research, Harpenden, Herts AL5 2JQ, UK
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