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Bolan S, Sharma S, Mukherjee S, Kumar M, Rao CS, Nataraj KC, Singh G, Vinu A, Bhowmik A, Sharma H, El-Naggar A, Chang SX, Hou D, Rinklebe J, Wang H, Siddique KHM, Abbott LK, Kirkham MB, Bolan N. Biochar modulating soil biological health: A review. Sci Total Environ 2024; 914:169585. [PMID: 38157897 DOI: 10.1016/j.scitotenv.2023.169585] [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] [Received: 10/01/2023] [Revised: 12/15/2023] [Accepted: 12/20/2023] [Indexed: 01/03/2024]
Abstract
Biochar can be used for multifunctional applications including the improvement of soil health and carbon storage, remediation of contaminated soil and water resources, mitigation of greenhouse gas emissions and odorous compounds, and feed supplementation to improve animal health. A healthy soil preserves microbial biodiversity that is effective in supressing plant pathogens and pests, recycling nutrients for plant growth, promoting positive symbiotic associations with plant roots, improving soil structure to supply water and nutrients, and ultimately enhancing soil productivity and plant growth. As a soil amendment, biochar assures soil biological health through different processes. First, biochar supports habitats for microorganisms due to its porous nature and by promoting the formation of stable soil micro-aggregates. Biochar also serves as a carbon and nutrient source. Biochar alters soil physical and chemical properties, creating optimum soil conditions for microbial diversity. Biochar can also immobilize soil pollutants and reduce their bioavailability that would otherwise inhibit microbial growth. However, depending on the pyrolysis settings and feedstock resources, biochar can be comprised of contaminants including polycyclic aromatic hydrocarbons and potentially toxic elements that can inhibit microbial activity, thereby impacting soil health.
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Affiliation(s)
- Shiv Bolan
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, Western Australia 6009, Australia; The UWA Institute of Agriculture, The University of Western Australia, Perth, Western Australia 6009, Australia; Healthy Environments And Lives (HEAL) National Research Network, Australia
| | - Shailja Sharma
- School of Biological & Environmental Sciences, Shoolini University of Biotechnology and Management Sciences, Solan 173229, India
| | - Santanu Mukherjee
- School of Agriculture, Shoolini University of Biotechnology and Management Sciences, Solan 173229, India
| | - Manish Kumar
- Amity Institute of Environmental Sciences, Amity University, Noida, India
| | - Ch Srinivasa Rao
- ICAR-National Academy of Agricultural Research Management, Hyderabad 500 030, India
| | - K C Nataraj
- Agricultural Research Station, Acharya N.G. Ranga Agricultural University, Anantapur 515 001, Andhra Pradesh, India
| | - Gurwinder Singh
- Global Innovative Centre for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment (CESE), The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Ajayan Vinu
- Global Innovative Centre for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment (CESE), The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Arnab Bhowmik
- Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, Greensboro, NC, United States of America
| | - Harmandeep Sharma
- Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, Greensboro, NC, United States of America
| | - Ali El-Naggar
- Department of Soil Sciences, Faculty of Agriculture, Ain Shams University, Cairo 11241, Egypt; State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, People's Republic of China; Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
| | - Scott X Chang
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
| | - Deyi Hou
- School of Environment, Tsinghua University, Beijing 100084, People's Republic of China
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany
| | - Hailong Wang
- Biochar Engineering Technology Research Center of Guangdong Province, School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, People's Republic of China
| | - Kadambot H M Siddique
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, Western Australia 6009, Australia; The UWA Institute of Agriculture, The University of Western Australia, Perth, Western Australia 6009, Australia
| | - Lynette K Abbott
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, Western Australia 6009, Australia; The UWA Institute of Agriculture, The University of Western Australia, Perth, Western Australia 6009, Australia
| | - M B Kirkham
- Department of Agronomy, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, United States of America
| | - Nanthi Bolan
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, Western Australia 6009, Australia; The UWA Institute of Agriculture, The University of Western Australia, Perth, Western Australia 6009, Australia; Healthy Environments And Lives (HEAL) National Research Network, Australia.
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Fouda A, Bhowmik A, Hassan SED, Hijri M. Editorial: Green nanomaterials: prospective biotechnological applications. Front Microbiol 2023; 14:1280398. [PMID: 37904873 PMCID: PMC10613473 DOI: 10.3389/fmicb.2023.1280398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Accepted: 09/21/2023] [Indexed: 11/01/2023] Open
Affiliation(s)
- Amr Fouda
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt
| | - Arnab Bhowmik
- Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, Greensboro, NC, United States
| | - Saad El-Din Hassan
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt
| | - Mohamed Hijri
- Institut de Recherche en Biologie Végétale (IRBV), Département de Sciences Biologiques, Universitéde Montréal, Montréal, QC, Canada
- African Genome Center, Mohammed VI Polytechnic University (UM6P), Ben Guerir, Morocco
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3
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Bhaduri D, Sihi D, Bhowmik A, Verma BC, Munda S, Dari B. A review on effective soil health bio-indicators for ecosystem restoration and sustainability. Front Microbiol 2022; 13:938481. [PMID: 36060788 PMCID: PMC9428492 DOI: 10.3389/fmicb.2022.938481] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [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: 05/07/2022] [Accepted: 06/29/2022] [Indexed: 11/30/2022] Open
Abstract
Preventing degradation, facilitating restoration, and maintaining soil health is fundamental for achieving ecosystem stability and resilience. A healthy soil ecosystem is supported by favorable components in the soil that promote biological productivity and provide ecosystem services. Bio-indicators of soil health are measurable properties that define the biotic components in soil and could potentially be used as a metric in determining soil functionality over a wide range of ecological conditions. However, it has been a challenge to determine effective bio-indicators of soil health due to its temporal and spatial resolutions at ecosystem levels. The objective of this review is to compile a set of effective bio-indicators for developing a better understanding of ecosystem restoration capabilities. It addresses a set of potential bio-indicators including microbial biomass, respiration, enzymatic activity, molecular gene markers, microbial metabolic substances, and microbial community analysis that have been responsive to a wide range of ecosystem functions in agricultural soils, mine deposited soil, heavy metal contaminated soil, desert soil, radioactive polluted soil, pesticide polluted soil, and wetland soils. The importance of ecosystem restoration in the United Nations Sustainable Development Goals was also discussed. This review identifies key management strategies that can help in ecosystem restoration and maintain ecosystem stability.
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Affiliation(s)
- Debarati Bhaduri
- ICAR-National Rice Research Institute, Cuttack, India
- *Correspondence: Debarati Bhaduri
| | - Debjani Sihi
- Department of Environmental Sciences, Emory University, Atlanta, GA, United States
| | - Arnab Bhowmik
- Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, Greensboro, NC, United States
- Arnab Bhowmik
| | - Bibhash C. Verma
- Central Rainfed Upland Rice Research Station (ICAR-NRRI), Hazaribagh, India
| | | | - Biswanath Dari
- Agriculture and Natural Resources, Cooperative Extension at North Carolina Agricultural and Technical State University, Greensboro, NC, United States
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Valizadehderakhshan M, Kazem-Rostami M, Shahbazi A, Azami M, Bhowmik A, Wang L. Refining Cannabidiol Using Wiped-Film Molecular Distillation: Experimentation, Process Modeling, and Prediction. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c00290] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Mehrab Valizadehderakhshan
- Joint School of Nanoscience and Nanoengineering, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27401, United States
| | - Masoud Kazem-Rostami
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
- Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney, New South Wales 2109, Australia
| | - Abolghasem Shahbazi
- Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 E. Market Street, Greensboro, North Carolina 27411, United States
| | - Mahsa Azami
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering (JSNN), University of North Carolina at Greensboro, Greensboro, North Carolina 27401, United States
| | - Arnab Bhowmik
- Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 E. Market Street, Greensboro, North Carolina 27411, United States
| | - Lijun Wang
- Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 E. Market Street, Greensboro, North Carolina 27411, United States
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Atoloye IA, Adesina IS, Sharma H, Subedi K, Liang CL(K, Shahbazi A, Bhowmik A. Hemp biochar impacts on selected biological soil health indicators across different soil types and moisture cycles. PLoS One 2022; 17:e0264620. [PMID: 35226702 PMCID: PMC8884510 DOI: 10.1371/journal.pone.0264620] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 02/14/2022] [Indexed: 11/18/2022] Open
Abstract
Application of crop residues and biochar have been demonstrated to improve soil biological and chemical properties in agroecosystems. However, the integrated effect of organic amendments and hydrological cycles on soil health indicators are not well understood. In this study, we quantified the impact of hemp residue (HR), hemp biochar (HB), and hardwood biochar (HA) on five hydrolytic enzymes, soil microbial phospholipid (PLFA) community structure, pH, permanganate oxidizable carbon (POXC) soil organic carbon (SOC), and total nitrogen (TN). We compared two soil types, Piedmont and Coastal Plain soils of North Carolina, under (i) a 30-d moisture cycle maintained at 60% water-filled pore space (WFPS) (D-W1), followed by (ii) a 7-day alternate dry-wet cycle for 42 days (D-W2), or (iii) maintained at 60% WFPS for 42 days (D-W3) during an aerobic laboratory incubation. Results showed that HR and HB significantly increased the geometric mean enzyme activity by 1-2-fold in the Piedmont soil under the three moisture cycles and about 1.5-fold under D-W in the Coastal soil. In the presence of HA, the measured soil enzyme activities were significantly lower than control under the moisture cycles in both soil types. The shift in microbial community structure was distinct in the Coastal soil but not in the Piedmont soil. Under D-W2, HR and HB significantly increased POXC (600–700 mg POXC kg-1 soil) in the Coastal soil but not in the Piedmont soil while HA increased nitrate (8 mg kg-1) retention in the Coastal soil. The differences in amendment effect on pH SOC, TN, POXC, and nitrate were less distinct in the fine-textured Piedmont soil than the coarse-textured Coastal soil. Overall, the results indicate that, unlike HA, HR and HB will have beneficial effects on soil health and productivity, therefore potentially improving soil’s resilience to changing climate.
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Affiliation(s)
- Idowu A. Atoloye
- Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC, United States of America
| | - Ifeoluwa S. Adesina
- Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC, United States of America
| | - Harmandeep Sharma
- Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC, United States of America
| | - Kiran Subedi
- Analytical Services Laboratory, College of Agriculture and Environmental Sciences, North Carolina A&T State University, Greensboro, NC, United States of America
| | - Chyi-Lyi (Kathleen) Liang
- Center for Environmental Farming Systems, North Carolina A&T State University, Greensboro, NC, United States of America
| | - Abolghasem Shahbazi
- Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC, United States of America
| | - Arnab Bhowmik
- Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC, United States of America
- * E-mail:
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Saha D, Kaye JP, Bhowmik A, Bruns MA, Wallace JM, Kemanian AR. Organic fertility inputs synergistically increase denitrification-derived nitrous oxide emissions in agroecosystems. Ecol Appl 2021; 31:e02403. [PMID: 34231260 DOI: 10.1002/eap.2403] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 12/23/2020] [Accepted: 03/03/2021] [Indexed: 06/13/2023]
Abstract
Soil fertility in organic agriculture relies on microbial cycling of nutrient inputs from legume cover crops and animal manure. However, large quantities of labile carbon (C) and nitrogen (N) in these amendments may promote the production and emission of nitrous oxide (N2 O) from soils. Better ecological understanding of the N2 O emission controls may lead to new management strategies to reduce these emissions. We measured soil N2 O emission for two growing seasons in four corn-soybean-winter grain rotations with tillage, cover crop, and manure management variations typical of organic agriculture in temperate and humid North America. To identify N2 O production pathways and mitigation opportunities, we supplemented N2 O flux measurements with determinations of N2 O isotopomer composition and microbiological genomic DNA abundances in microplots where we manipulated cover crop and manure additions. The N input from legume-rich cover crops and manure prior to corn planting made the corn phase the main source of N2 O emissions, averaging 9.8 kg/ha of N2 O-N and representing 80% of the 3-yr rotations' total emissions. Nitrous oxide emissions increased sharply when legume cover crop and manure inputs exceeded 1.8 and 4 Mg/ha (dry matter), respectively. Removing the legume aboveground biomass before corn planting to prevent co-location of fresh biomass and manure decreased N2 O emissions by 60% during the corn phase. The co-occurrence of peak N2 O emission and high carbon dioxide emission suggests that oxygen (O2 ) consumption likely caused hypoxia and bacterial denitrification. This interpretation is supported by the N2 O site preference values trending towards denitrification during peak emissions with limited N2 O reduction, as revealed by the N2 O δ15 N and δ18 O and the decrease in clade I nosZ gene abundance following incorporation of cover crops and manure. Thus, accelerated microbial O2 consumption seems to be a critical control of N2 O emissions in systems with large additions of decomposable C and N substrates. Because many agricultural systems rely on combined fertility inputs from legumes and manures, our research suggests that controlling the rate and timing of organic input additions, as well as preventing the co-location of legume cover crops and manure, could mitigate N2 O emissions.
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Affiliation(s)
- Debasish Saha
- Department of Plant Science, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Jason P Kaye
- Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Arnab Bhowmik
- Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Mary Ann Bruns
- Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - John M Wallace
- Department of Plant Science, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Armen R Kemanian
- Department of Plant Science, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
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Eid AM, Fouda A, Abdel-Rahman MA, Salem SS, Elsaied A, Oelmüller R, Hijri M, Bhowmik A, Elkelish A, Hassan SED. Harnessing Bacterial Endophytes for Promotion of Plant Growth and Biotechnological Applications: An Overview. Plants (Basel) 2021; 10:935. [PMID: 34067154 PMCID: PMC8151188 DOI: 10.3390/plants10050935] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 04/29/2021] [Accepted: 05/03/2021] [Indexed: 12/19/2022]
Abstract
Endophytic bacteria colonize plants and live inside them for part of or throughout their life without causing any harm or disease to their hosts. The symbiotic relationship improves the physiology, fitness, and metabolite profile of the plants, while the plants provide food and shelter for the bacteria. The bacteria-induced alterations of the plants offer many possibilities for biotechnological, medicinal, and agricultural applications. The endophytes promote plant growth and fitness through the production of phytohormones or biofertilizers, or by alleviating abiotic and biotic stress tolerance. Strengthening of the plant immune system and suppression of disease are associated with the production of novel antibiotics, secondary metabolites, siderophores, and fertilizers such as nitrogenous or other industrially interesting chemical compounds. Endophytic bacteria can be used for phytoremediation of environmental pollutants or the control of fungal diseases by the production of lytic enzymes such as chitinases and cellulases, and their huge host range allows a broad spectrum of applications to agriculturally and pharmaceutically interesting plant species. More recently, endophytic bacteria have also been used to produce nanoparticles for medical and industrial applications. This review highlights the biotechnological possibilities for bacterial endophyte applications and proposes future goals for their application.
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Affiliation(s)
- Ahmed M. Eid
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt; (A.M.E.); (M.A.A.-R.); (S.S.S.); (A.E.)
| | - Amr Fouda
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt; (A.M.E.); (M.A.A.-R.); (S.S.S.); (A.E.)
| | - Mohamed Ali Abdel-Rahman
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt; (A.M.E.); (M.A.A.-R.); (S.S.S.); (A.E.)
| | - Salem S. Salem
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt; (A.M.E.); (M.A.A.-R.); (S.S.S.); (A.E.)
| | - Albaraa Elsaied
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt; (A.M.E.); (M.A.A.-R.); (S.S.S.); (A.E.)
| | - Ralf Oelmüller
- Department of Plant Physiology, Matthias Schleiden Institute of Genetics, Bioinformatics and Molecular Botany, Friedrich-Schiller-University, 07743 Jena, Germany; (R.O.); (A.E.)
| | - Mohamed Hijri
- Biodiversity Centre, Institut de Recherche en Biologie Végétale, Université de Montréal and Jardin botanique de Montréal, Montréal, QC 22001, Canada;
- African Genome Center, Mohammed VI Polytechnic University (UM6P), 43150 Ben Guerir, Morocco
| | - Arnab Bhowmik
- Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC 27411, USA;
| | - Amr Elkelish
- Department of Plant Physiology, Matthias Schleiden Institute of Genetics, Bioinformatics and Molecular Botany, Friedrich-Schiller-University, 07743 Jena, Germany; (R.O.); (A.E.)
- Botany Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt
| | - Saad El-Din Hassan
- Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt; (A.M.E.); (M.A.A.-R.); (S.S.S.); (A.E.)
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York HM, Patil A, Moorthi UK, Kaur A, Bhowmik A, Hyde GJ, Gandhi H, Fulcher A, Gaus K, Arumugam S. Rapid whole cell imaging reveals a calcium-APPL1-dynein nexus that regulates cohort trafficking of stimulated EGF receptors. Commun Biol 2021; 4:224. [PMID: 33597720 PMCID: PMC7889693 DOI: 10.1038/s42003-021-01740-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Accepted: 01/22/2021] [Indexed: 01/31/2023] Open
Abstract
The endosomal system provides rich signal processing capabilities for responses elicited by growth factor receptors and their ligands. At the single cell level, endosomal trafficking becomes a critical component of signal processing, as exemplified by the epidermal growth factor (EGF) receptors. Activated EGFRs are trafficked to the phosphatase-enriched peri-nuclear region (PNR), where they are dephosphorylated and degraded. The details of the mechanisms that govern the movements of stimulated EGFRs towards the PNR, are not completely known. Here, exploiting the advantages of lattice light-sheet microscopy, we show that EGFR activation by EGF triggers a transient calcium increase causing a whole-cell level redistribution of Adaptor Protein, Phosphotyrosine Interacting with PH Domain And Leucine Zipper 1 (APPL1) from pre-existing endosomes within one minute, the rebinding of liberated APPL1 directly to EGFR, and the dynein-dependent translocation of APPL1-EGF-bearing endosomes to the PNR within ten minutes. The cell spanning, fast acting network that we reveal integrates a cascade of events dedicated to the cohort movement of activated EGF receptors. Our findings support the intriguing proposal that certain endosomal pathways have shed some of the stochastic strategies of traditional trafficking and have evolved processes that provide the temporal predictability that typify canonical signaling.
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Affiliation(s)
- H. M. York
- grid.1002.30000 0004 1936 7857Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton/Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857European Molecular Biological Laboratory Australia (EMBL Australia), Monash University, Clayton/Melbourne, VIC Australia
| | - A. Patil
- grid.1002.30000 0004 1936 7857Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton/Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857European Molecular Biological Laboratory Australia (EMBL Australia), Monash University, Clayton/Melbourne, VIC Australia
| | - U. K. Moorthi
- grid.1002.30000 0004 1936 7857Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton/Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857European Molecular Biological Laboratory Australia (EMBL Australia), Monash University, Clayton/Melbourne, VIC Australia
| | - A. Kaur
- grid.1005.40000 0004 4902 0432Single Molecule Science, University of New South Wales, Sydney, Australia
| | - A. Bhowmik
- grid.1005.40000 0004 4902 0432Single Molecule Science, University of New South Wales, Sydney, Australia
| | | | - H. Gandhi
- grid.1002.30000 0004 1936 7857Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton/Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857European Molecular Biological Laboratory Australia (EMBL Australia), Monash University, Clayton/Melbourne, VIC Australia
| | - A. Fulcher
- grid.1002.30000 0004 1936 7857Monash Micro Imaging, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton/Melbourne, VIC Australia
| | - K. Gaus
- grid.1005.40000 0004 4902 0432Single Molecule Science, University of New South Wales, Sydney, Australia ,grid.1005.40000 0004 4902 0432ARC Centre of Excellence in Advanced Molecular Imaging, UNSW, Sydney, Australia
| | - S. Arumugam
- grid.1002.30000 0004 1936 7857Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton/Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857European Molecular Biological Laboratory Australia (EMBL Australia), Monash University, Clayton/Melbourne, VIC Australia ,grid.1005.40000 0004 4902 0432Single Molecule Science, University of New South Wales, Sydney, Australia ,grid.1005.40000 0004 4902 0432ARC Centre of Excellence in Advanced Molecular Imaging, UNSW, Sydney, Australia
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Evans R, Taylor S, Kalasthry J, Sakai N, Miles A, Aboagye A, Agoramoorthy L, Ahmed S, Amadi A, Anand G, Atkin G, Austria A, Ball S, Bazari F, Beable R, Beare S, Beedham H, Beeston T, Bharwani N, Bhatnagar G, Bhowmik A, Blakeway L, Blunt D, Boavida P, Boisfer D, Breen D, Bridgewater J, Burke S, Butawan R, Campbell Y, Chang E, Chao D, Chukundah S, Clarke C, Collins B, Collins C, Conteh V, Couture J, Crosbie J, Curtis H, Daniel A, Davis L, Desai K, Duggan M, Ellis S, Elton C, Engledow A, Everitt C, Ferdous S, Frow A, Furneaux M, Gibbons N, Glynne-Jones R, Gogbashian A, Goh V, Gourtsoyianni S, Green A, Green L, Green L, Groves A, Guthrie A, Hadley E, Halligan S, Hameeduddin A, Hanid G, Hans S, Hans B, Higginson A, Honeyfield L, Hughes H, Hughes J, Hurl L, Isaac E, Jackson M, Jalloh A, Janes S, Jannapureddy R, Jayme A, Johnson A, Johnson E, Julka P, Kalasthry J, Karapanagiotou E, Karp S, Kay C, Kellaway J, Khan S, Koh D, Light T, Limbu P, Lock S, Locke I, Loke T, Lowe A, Lucas N, Maheswaran S, Mallett S, Marwood E, McGowan J, Mckirdy F, Mills-Baldock T, Moon T, Morgan V, Morris S, Morton A, Nasseri S, Navani N, Nichols P, Norman C, Ntala E, Nunes A, Obichere A, O'Donohue J, Olaleye I, Oliver A, Onajobi A, O'Shaughnessy T, Padhani A, Pardoe H, Partridge W, Patel U, Perry K, Piga W, Prezzi D, Prior K, Punwani S, Pyers J, Rafiee H, Rahman F, Rajanpandian I, Ramesh S, Raouf S, Reczko K, Reinhardt A, Robinson D, Rockall A, Russell P, Sargus K, Scurr E, Shahabuddin K, Sharp A, Shepherd B, Shiu K, Sidhu H, Simcock I, Simeon C, Smith A, Smith D, Snell D, Spence J, Srirajaskanthan R, Stachini V, Stegner S, Stirling J, Strickland N, Tarver K, Teague J, Thaha M, Train M, Tulmuntaha S, Tunariu N, van Ree K, Verjee A, Wanstall C, Weir S, Wijeyekoon S, Wilson J, Wilson S, Win T, Woodrow L, Yu D. Patient deprivation and perceived scan burden negatively impact the quality of whole-body MRI. Clin Radiol 2020; 75:308-315. [PMID: 31836179 DOI: 10.1016/j.crad.2019.10.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 10/30/2019] [Indexed: 01/26/2023]
Abstract
AIM To evaluate the association between the image quality of cancer staging whole-body magnetic resonance imaging (WB-MRI) and patient demographics, distress, and perceived scan burden. MATERIALS AND METHODS A sample of patients recruited prospectively to multicentre trials comparing WB-MRI with standard scans for staging lung and colorectal cancer were invited to complete two questionnaires. The baseline questionnaire, administered at recruitment, collated data on demographics, distress and co-morbidity. The follow-up questionnaire, completed after staging investigations, measured perceived WB-MRI scan burden (scored 1 low to 7 high). WB-MRI anatomical coverage, and technical quality was graded by a radiographic technician and grading combined to categorise the scan as "optimal", "sub-optimal" or "degraded". A radiologist categorised 30 scans to test interobserver agreement. Data were analysed using the chi-square, Fisher's exact, t-tests, and multinomial regression. RESULTS One hundred and fourteen patients were included in the study (53 lung, 61 colorectal; average age 65.3 years, SD=11.8; 66 men [57.9%]). Overall, 45.6% (n=52), scans were classified as "optimal" quality, 39.5% (n=45) "sub-optimal", and 14.9% (n=17) as "degraded". In adjusted analyses, greater deprivation level and higher patient-reported scan burden were both associated with a higher likelihood of having a sub-optimal versus an optimal scan (odds ratio [OR]: 4.465, 95% confidence interval [CI]: 1.454 to 13.709, p=0.009; OR: 1.987, CI: 1.153 to 3.425, p=0.013, respectively). None of the variables predicted the likelihood of having a degraded scan. CONCLUSIONS Deprivation and patients' perceived experience of the WB-MRI are related to image quality. Tailored protocols and individualised patient management before and during WB-MRI may improve image quality.
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Vorsah RV, Dingha BN, Gyawaly S, Fremah SA, Sharma H, Bhowmik A, Worku M, Jackai LE. Organic Mulch Increases Insect Herbivory by the Flea Beetle Species, Disonycha glabrata, on Amaranthus spp. Insects 2020; 11:E162. [PMID: 32138147 PMCID: PMC7143821 DOI: 10.3390/insects11030162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 02/28/2020] [Accepted: 02/28/2020] [Indexed: 11/20/2022]
Abstract
Amaranth (Amaranthus spp.) is an increasingly high-valued niche vegetable crop among small organic growers in North Carolina, due to its increasing demand among diverse immigrant groups. Production is however hampered by insect pests such as the flea beetle (FB), Disonycha glabrata (Coleoptera: Chrysomelidae), that cause significant yield reduction. Chemical insecticides are generally applied for pest control despite their known risks to health and the environment. Integrated pest management (IPM), which is a cost effective and environmentally friendly approach is still under-exploited in vegetable production by small growers. We studied IPM approaches, suitable for organic production of amaranth by screening nine amaranth varieties for resistance to the flea beetle (FB), D. glabrata, grown with, and without, mulch. D. glabrata population was 60% higher in plots with mulch compared to plots without. The amaranth varieties Molten fire and Green Callaloo recorded the lowest and the highest beetle population commensurate with low, and high leaf damage, respectively. Conversely, leaf yields in the mulched plots were 50% less than recorded in the zero-mulch counterpart, with Green Callaloo variety recording the lowest. These findings will serve as building blocks for a sustainable pest management plan that is appropriate for organic production of Amaranthus spp. in North Carolina.
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Affiliation(s)
- Roger V. Vorsah
- Department of Natural Resources and Environmental Design, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (R.V.V.); (B.N.D.); (S.G.); (H.S.); (A.B.)
| | - Beatrice N. Dingha
- Department of Natural Resources and Environmental Design, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (R.V.V.); (B.N.D.); (S.G.); (H.S.); (A.B.)
| | - Sudan Gyawaly
- Department of Natural Resources and Environmental Design, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (R.V.V.); (B.N.D.); (S.G.); (H.S.); (A.B.)
| | - Sarah A. Fremah
- Department of Animal Science, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (S.A.F.); (M.W.)
| | - Harmandeep Sharma
- Department of Natural Resources and Environmental Design, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (R.V.V.); (B.N.D.); (S.G.); (H.S.); (A.B.)
| | - Arnab Bhowmik
- Department of Natural Resources and Environmental Design, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (R.V.V.); (B.N.D.); (S.G.); (H.S.); (A.B.)
| | - Mulumebet Worku
- Department of Animal Science, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (S.A.F.); (M.W.)
| | - Louis E. Jackai
- Department of Natural Resources and Environmental Design, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA; (R.V.V.); (B.N.D.); (S.G.); (H.S.); (A.B.)
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Horst C, Ruparel M, Dickson J, Quaife S, Hall H, Tisi S, Taylor M, Ahmed A, Shaw P, Burke S, Soo M, Nair A, Devaraj A, Duffy S, Waller J, Navani N, Bhowmik A, Baldwin D, Janes S. Optimising nodule management with data from the Lung Screen Uptake Trial. Lung Cancer 2019. [DOI: 10.1016/s0169-5002(19)30099-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Woznitza N, Devaraj A, Janes S, Duffy S, Rowe S, Bhowmik A, Maughn S, Piper K, Baldwin D. Impact of radiographer immediate reporting of chest x-rays from general practice on the lung cancer pathway (radioX). Lung Cancer 2019. [DOI: 10.1016/s0169-5002(19)30073-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ruparel M, Dickson J, Quaife S, Sophie T, Hall H, Horst C, Taylor M, Ahmed A, Shaw P, Burke S, Soo M, Nair A, Devaraj A, Duffy S, Waller J, Navani N, Bhowmik A, Baldwin D, Janes S. Results from a prevalence round of LDCT screening for lung cancer in the Lung Screen Uptake Trial. Lung Cancer 2019. [DOI: 10.1016/s0169-5002(19)30100-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Ruparel M, Quaife S, Ghimire B, Dickson J, Horst C, Tisi S, Bhowmik A, Navani N, Baldwin D, Duffy S, Waller J, Janes S. P2.11-29 Impact of an Information-Film to Promote Informed Decision-Making in Individuals Taking Part in a Lung Cancer Screening Demonstration Pilot. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Bhowmik A, Cloutier M, Ball E, Bruns MA. Underexplored microbial metabolisms for enhanced nutrient recycling in agricultural soils. AIMS Microbiol 2017; 3:826-845. [PMID: 31294192 PMCID: PMC6604955 DOI: 10.3934/microbiol.2017.4.826] [Citation(s) in RCA: 16] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 09/21/2017] [Indexed: 01/03/2023] Open
Abstract
Worldwide, arable soils have been degraded through erosion and exhaustive cultivation, and substantial proportions of fertilizer nutrients are not taken up by crops. A central challenge in agriculture is to understand how soils and resident microbial communities can be managed to deliver nutrients to crops more efficiently with minimal losses to the environment. Throughout much of the twentieth century, intensive farming has caused substantial loss of organic matter and soil biological function. Today, more farmers recognize the importance of protecting soils and restoring organic matter through reduced tillage, diversified crop rotation, cover cropping, and increased organic amendments. Such management practices are expected to foster soil conditions more similar to those of undisturbed, native plant-soil systems by restoring soil biophysical integrity and re-establishing plant-microbe interactions that retain and recycle nutrients. Soil conditions which could contribute to desirable shifts in microbial metabolic processes include lower redox potentials, more diverse biogeochemical gradients, higher concentrations of labile carbon, and enrichment of carbon dioxide (CO2) and hydrogen gas (H2) in soil pores. This paper reviews recent literature on generalized and specific microbial processes that could become more operational once soils are no longer subjected to intensive tillage and organic matter depletion. These processes include heterotrophic assimilation of CO2; utilization of H2 as electron donor or reactant; and more diversified nitrogen uptake and dissimilation pathways. Despite knowledge of these processes occurring in laboratory studies, they have received little attention for their potential to affect nutrient and energy flows in soils. This paper explores how soil microbial processes could contribute to in situ nutrient retention, recycling, and crop uptake in agricultural soils managed for improved biological function.
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Affiliation(s)
- Arnab Bhowmik
- Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA 16802, USA
| | - Mara Cloutier
- Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA 16802, USA.,Dual-Title Graduate Program in Biogeochemistry, The Pennsylvania State University, University Park, PA 16802, USA
| | - Emily Ball
- Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA 16802, USA
| | - Mary Ann Bruns
- Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA 16802, USA.,Dual-Title Graduate Program in Biogeochemistry, The Pennsylvania State University, University Park, PA 16802, USA.,Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, University Park, PA 16802, USA
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Sharma LK, Bali SK, Dwyer JD, Plant AB, Bhowmik A. A Case Study of Improving Yield Prediction and Sulfur Deficiency Detection Using Optical Sensors and Relationship of Historical Potato Yield with Weather Data in Maine. Sensors (Basel) 2017; 17:s17051095. [PMID: 28492476 PMCID: PMC5470485 DOI: 10.3390/s17051095] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 05/02/2017] [Accepted: 05/08/2017] [Indexed: 11/16/2022]
Abstract
In Maine, potato yield is consistent, 38 t·ha-1, for last 10 years except 2016 (44 t·ha-1) which confirms that increasing the yield and quality of potatoes with current fertilization practices is difficult; hence, new or improvised agronomic methods are needed to meet with producers and industry requirements. Normalized difference vegetative index (NDVI) sensors have shown promise in regulating N as an in season application; however, using late N may stretch out the maturation stage. The purpose of the research was to test Trimble GreenSeeker® (TGS) and Holland Scientific Crop Circle™ ACS-430 (HCCACS-430) wavebands to predict potato yield, before the second hilling (6-8 leaf stage). Ammonium sulfate, S containing N fertilizer, is not advised to be applied on acidic soils but accounts for 60-70% fertilizer in Maine's acidic soils; therefore, sensors are used on sulfur deficient site to produce sensor-bound S application guidelines before recommending non-S-bearing N sources. Two study sites investigated for this research include an S deficient site and a regular spot with two kinds of soils. Six N treatments, with both calcium ammonium nitrate and ammonium nitrate, under a randomized complete block design with four replications, were applied at planting. NDVI readings from both sensors were obtained at V8 leaf stages (8 leaf per plant) before the second hilling. Both sensors predict N and S deficiencies with a strong interaction with an average coefficient of correlation (r²) ~45. However, HCCACS-430 was observed to be more virtuous than TGS. The correlation between NDVI (from both sensors) and the potato yield improved using proprietor-proxy leaf area index (PPLAI) from HCCACS-430, e.g., r² value of TGS at Easton site improve from 48 to 60. Weather data affected marketable potato yield (MPY) significantly from south to north in Maine, especially precipitation variations that could be employed in the N recommendations at planting and in season application. This case study addresses a substantial need to revise potato N recommendations at planting and develop possible in season N recommendation using ground based active optical (GBAO) sensors.
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Affiliation(s)
- Lakesh K Sharma
- Department of Cooperative Extension, University of Maine, 57 Houlton Rd, Presque Isle, ME 04769, USA.
| | - Sukhwinder K Bali
- Department of Cooperative Extension, University of Maine, 57 Houlton Rd, Presque Isle, ME 04769, USA.
| | - James D Dwyer
- Department of Cooperative Extension, University of Maine, 57 Houlton Rd, Presque Isle, ME 04769, USA.
| | - Andrew B Plant
- Maine Potato Board, 744 Main Street, Suite 1, Presque Isle, ME 04769, USA.
| | - Arnab Bhowmik
- Department of Ecosystem Science and Management, 248 Ag Sciences and Industrial Building, Pennsylvania State University, University Park, PA 16802, USA.
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Horst C, Ruparel M, Quaife S, Ahmed A, Taylor M, Bhowmik A, Burke S, Shaw P, McEwen A, Waller J, Baldwin DR, Navani N, Thakrar R, Janes SM. S130 The prevalence of undiagnosed copd on spirometry and emphysema on low-dose ct scans in a lung cancer screening demonstration pilot: a teachable moment? Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Garner A, Hodson M, Ketsetzis G, Bhowmik A. M20 A five-year analysis of an integrated COPD service in Hackney, London – is this the right direction? Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Murray J, Repossi A, Ismail S, Bhowmik A, Bothamley G. P183 Endobronchial Ultrasound And Tuberculosis: Beware The Non-caseating Granuloma. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Martineau A, James W, Hooper R, Barnes N, Jolliffe D, Bhowmik A, Rajakulasingam R, Choudhury A, Simcock D, Corrigan C, Hawrylowicz C, Griffiths C. S104 Double-blind Multi-centre Randomised Controlled Trial Of Vitamin D3 Supplementation In Copd (vidico). Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Martineau A, MacLaughlin B, Hooper R, Barnes N, Jolliffe D, Choudhury A, Rajakulasingam R, Bhowmik A, Simcock D, Grigg J, Corrigan C, Hawrylowicz C, Griffiths C. S95 Double-blind Multi-centre Randomised Controlled Trial Of Vitamin D3 Supplementation In Adults With Inhaled Corticosteroid-treated Asthma (vidias). Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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22
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Farah N, Gorrela R, Bhowmik A, Bothamley GH, Menon M, Devalia K, Koak Y, Agrawal S, Mannur K, Rajakulasingam K. P255 Improvement of sleep apnoea severity in obese patients pre and post bariatric surgery-is there more to it? Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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De R, Bhandari S, Roy S, Bhowmik A, Rewari BB, Guha SK. Factors responsible for delayed enrollment for anti-retroviral treatment. J Nepal Health Res Counc 2013; 11:194-197. [PMID: 24362610] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
BACKGROUND Late presentation followed by delayed diagnosis and further delayed initiation of anti-retroviral therapy (ART) increases the risk of opportunistic infections and neoplasms among the HIV infected patients. Furthermore, this leads to not only poor response to therapy but also early death among them. METHODS An institution based cross-sectional study was undertaken to identify the factor(s) responsible for delayed registration for initiation of therapy among the HIV infected patients with absolute CD4 count <250 cells/μL based on self reports. ART naïve adult HIV patients (age ≥18 years) with baseline CD4 count of <250 cells/μL were included in this study. RESULTS Most patients 95 (95%) were unaware of the available 'Integrated Counseling and Testing Centres'. Although 13 (13%) respondents had multiple reasons for delayed enrollment, majority 47 (47%) of the delays were due to the physician's failure to suspect and refer them for HIV testing at the earliest opportunity. Other causes include health seeking behavior 13 (13%), fear of stigma 5 (5%), depression 3 (3%), and lack of family support 6 (6%). CONCLUSIONS Even though delays in pre-ART enrollment have been realized since long, prevention efforts are poor, mostly due to the lack of understanding of the nature of the problem in its social context. Lack of clinical suspicion for HIV infection at the primary and secondary levels of health care still remains the most important reason for the delay. In order to prevent these delays in enrollments, intervention efforts need to be focused on not only the people infected with HIV but the primary health care providers as well, especially the practicing physicians.
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Affiliation(s)
- R De
- Centre of Excellence in HIV Care, School of Tropical Medicine, Kolkata
| | - S Bhandari
- Centre of Excellence in HIV Care, School of Tropical Medicine, Kolkata
| | - S Roy
- Centre of Excellence in HIV Care, School of Tropical Medicine, Kolkata
| | - A Bhowmik
- Centre of Excellence in HIV Care, School of Tropical Medicine, Kolkata
| | - B B Rewari
- National AIDS Control Organization, Ministry of Health and Family Welfare, New Delhi
| | - S K Guha
- Centre of Excellence in HIV Care, School of Tropical Medicine, Kolkata,Department of Tropical Medicine, School of Tropical Medicine Kolkata, India
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Jayanna K, Ramesh, Bhowmik A, Thomas A, Mony P, Shankar K, Schurmann A, Moses S, Avery L, Blanchard J. O338 MANAGEMENT OF ECLAMPSIA AND POSTPARTUM HEMORRHAGE: CHALLENGES AND OPPORTUNITIES TO IMPROVE QUALITY OF CARE IN NORTHERN KARNATAKA, INDIA. Int J Gynaecol Obstet 2012. [DOI: 10.1016/s0020-7292(12)60768-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Fritscher-Ravens A, Ghanbari A, Topalidis T, Pelling M, Kon OM, Patel K, Arlt A, Bhowmik A. Granulomatous mediastinal adenopathy: can endoscopic ultrasound-guided fine-needle aspiration differentiate between tuberculosis and sarcoidosis? Endoscopy 2011; 43:955-61. [PMID: 21833904 DOI: 10.1055/s-0031-1271110] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
BACKGROUND AND STUDY AIMS Mediastinal lymphadenopathy may indicate diseases such as tuberculosis or sarcoidosis, and it is often difficult to establish a diagnosis when standard medical work-up is inconclusive. In this study we investigated the diagnostic yield of endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) in the differentiation between tuberculosis and sarcoidosis. PATIENTS AND METHODS In this prospective study, 72 consecutive patients with mediastinal lymphadenopathy, negative endoscopic investigations including bronchoscopic procedures, and no radiological evidence of lung cancer or other malignancies on computed tomography were enrolled. EUS-FNA and subsequent cytology, microscopy for acid-fast bacilli, and culture were performed. At least 12 months' follow-up including further investigations was included to exclude tuberculosis. RESULTS Adequate samples were obtained from 71/72 patients (36 male; mean age 50.2 years). No complications occurred. The final diagnosis included 30 cases of sarcoidosis, 28 of tuberculosis, four malignancies, one abscess, and nine benign lymphadenopathies. The size of lymph nodes on EUS varied from 0.5 cm to 4.2 cm. Tuberculosis nodes were significantly smaller than those in sarcoidosis. Unrelated nodes were significantly smaller than in either tuberculosis or sarcoidosis. The sensitivity, specificity, and positive and negative predictive values of EUS - FNA for tuberculosis were 86 %, 100 %, 100 %, and 91 %, respectively; those for sarcoidosis were 100 %, 93 %, 91 %, and 100 %, respectively. For culture of tuberculosis, they were 71 %, 100 %, 100 %, and 84 %, respectively. EUS - FNA led to a definite diagnosis in 64/72 cases (89 %) that had not been previously diagnosed by routine methods. CONCLUSION EUS - FNA offers a high diagnostic yield for the differential diagnosis of tuberculosis and sarcoidosis that have not been diagnosed by conventional methods.
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Bhowmik A, Quint J. Lung Alerts: promoting education and encouraging new authors. Thorax 2010. [DOI: 10.1136/thx.2010.146100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Hillman T, Rajakulasingam K, Bhowmik A. Clinically significant outcomes in smoking cessation. Thorax 2008; 63:752-753. [PMID: 18663078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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Seemungal T, Harrinarine R, Rios M, Abiraj V, Ali A, Lacki N, Mahabir N, Ramoutar V, King CP, Bhowmik A, Wedzicha JA. Obstructive lung disease in acute medical patients. W INDIAN MED J 2008; 57:7-13. [PMID: 19565931] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVES To determine the proportion of adult medical patients who have chronic obstructive pulmonary disease (COPD), using the Global initiative for Chronic Obstructive Lung Disease guidelines (GOLD), and its relation to vascular disease. METHODS This is a prospective cross-sectional study of adult patients admitted to acute medical wards. Interviewer administered questionnaire, anthropometric and spirometric measurements were done. RESULTS Spirometry was performed in 720 acute admissions [Mean (SD) age 50.0 (18.9) years, FEV1: 1.98 L (0.83), FEV1/FVC%: 75.1 (11.9)%; males 332 (46.1%), smokers 318 (44%); 43.2% had vascular disease]. Sixty-seven per cent of patients (480) had no airway disease including 35 (4.5%) with chronic cough and sputum with normal spirometry; 89 (12.4%) had asthma and 151 (20.9%) had COPD. Patients with COPD were significantly older [60.3 (16.6) years] than non-COPD patients [47.3 (18.5) years], p < 0.001 and had a greater number of pack years of smoking. A greater percentage of patients with COPD had vascular disease (52%) than the non-COPD patients (40.1%), p = 0.017). Multivariate analysis with vascular disease as outcome variable revealed relationships with older age (p < 0.001) and Indo-Trinidadian ethnicity (p = 0.015), but not with gender (p = 0.321) and smoking (p = 0.442). FEV1% as well as FEV1 showed a significant inverse relationship with vascular disease (p < 0.05). CONCLUSIONS The prevalence of COPD using GOLD guidelines in acute hospital admissions is 20.9%; 11.7% of admissions have chronic sputum or cough with normal spirometry. Vascular disease is more prevalent in those with COPD. Patients admitted to acute medical care with vascular disease may also have COPD.
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Affiliation(s)
- T Seemungal
- Department of Clinical Medical Sciences, Faculty of Medical Sciences, The University of the West Indies, Eric Williams Medical Sciences Complex, Mount Hope, Trinidad and Tobago.
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Mercer PF, Shute JK, Bhowmik A, Donaldson GC, Wedzicha JA, Warner JA. MMP-9, TIMP-1 and inflammatory cells in sputum from COPD patients during exacerbation. Respir Res 2005; 6:151. [PMID: 16372907 PMCID: PMC1351193 DOI: 10.1186/1465-9921-6-151] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.6] [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: 07/27/2005] [Accepted: 12/22/2005] [Indexed: 01/21/2023] Open
Abstract
Background Irreversible airflow obstruction in Chronic Obstructive Pulmonary Disease (COPD) is thought to result from airway remodelling associated with aberrant inflammation. Patients who experience frequent episodes of acute deterioration in symptoms and lung function, termed exacerbations, experience a faster decline in their lung function, and thus over time greater disease severity However the mechanisms by which these episodes may contribute to decreased lung function are poorly understood. This study has prospectively examined changes in sputum levels of inflammatory cells, MMP-9 and TIMP-1 during exacerbations comparing with paired samples taken prior to exacerbation. Methods Nineteen COPD patients ((median, [IQR]) age 69 [63 to 74], forced expiratory volume in one second (FEV1) 1.0 [0.9 to1.2], FEV1% predicted 37.6 [27.3 to 46.2]) provided sputa at exacerbation. Of these, 12 were paired with a samples collected when the patient was stable, a median 4 months [2 to 8 months] beforehand. Results MMP-9 levels increased from 10.5 μg/g [1.2 to 21.1] prior to exacerbation to 17.1 μg/g [9.3 to 48.7] during exacerbation (P < 0.01). TIMP-1 levels decreased from 3.5 μg/g [0.6 to 7.8] to 1.5 μg/g [0.3 to 4.9] (P = 0.16). MMP-9/TIMP-1 Molar ratio significantly increased from 0.6 [0.2 to 1.1] to 3.6 [2.0 to 25.3] (P < 0.05). Neutrophil, eosinophil and lymphocyte counts all showed significant increase during exacerbation compared to before (P < 0.05). Macrophage numbers remained level. MMP-9 levels during exacerbation showed highly significant correlation with both neutrophil and lymphocyte counts (Rho = 0.7, P < 0.01). Conclusion During exacerbation, increased inflammatory burden coincides with an imbalance of the proteinase MMP-9 and its cognate inhibitor TIMP-1. This may suggest a pathway connecting frequent exacerbations with lung function decline.
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Affiliation(s)
- PF Mercer
- School of Biological Sciences, University of Southampton, Southampton, UK
| | - JK Shute
- Department of Medical Specialties, University of Southampton, Southampton, UK
| | - A Bhowmik
- Academic Unit of Respiratory Medicine, Royal Free and University College Medical School, London, UK
| | - GC Donaldson
- Academic Unit of Respiratory Medicine, Royal Free and University College Medical School, London, UK
| | - JA Wedzicha
- Academic Unit of Respiratory Medicine, Royal Free and University College Medical School, London, UK
| | - JA Warner
- School of Biological Sciences, University of Southampton, Southampton, UK
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Abstract
Exhaled nitric oxide (eNO) appears to be associated with airway inflammation seen in chronic obstructive pulmonary disease (COPD). The present authors studied the effects of exacerbation, season, temperature and pollution on eNO. eNO was measured seasonally and at exacerbations in 79 outpatients suffering from COPD (mean forced expiratory volume in one second=42%). The effects of exacerbation symptoms, physiological and environmental parameters were analysed. Stable eNO levels were correlated positively with arterial oxygen tension. Median levels were found to be lower in smokers (5.3 ppb) than in ex- or nonsmokers (6.8 ppb). Levels were higher during October to December (6.9 ppb) than in April to June (4.6 ppb). Levels were also higher during 68 exacerbations in 38 patients (7.4 ppb) than in stable conditions (5.4 ppb), independent of the effects of smoking. The rise in eNO was greater in exacerbations that were associated with colds, a sore throat or dyspnoea combined with a cold. In conclusion, exhaled nitric oxide levels were higher in colder weather and in the autumn, perhaps related to the increased prevalence of viral infection at this time of year. The levels were lower in more severe chronic obstructive pulmonary disease. Exhaled nitric oxide levels were raised at the onset of exacerbation, particularly in the presence of a cold.
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Affiliation(s)
- A Bhowmik
- Academic Unit of Respiratory Medicine, St. Bartholomew's and Royal London School of Medicine and Dentistry, London, UK.
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Boyd AE, Bhowmik A, Rajakulasingam K. Roflumilast for chronic obstructive pulmonary disease. Lancet 2005; 366:1846; author reply 1846-7. [PMID: 16310547 DOI: 10.1016/s0140-6736(05)67749-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Bhowmik A. Peak flow may be useful in screening for COPD in the absence of spirometry. Thorax 2003. [DOI: 10.1136/thorax.58.12.1057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Bhowmik A. Inhaled corticosteroids and long acting beta2 agonists can help patients with COPD. Thorax 2003. [DOI: 10.1136/thorax.58.5.424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Bhowmik A. Identifying adventure travellers at risk of developing exacerbations of asthma. Thorax 2003. [DOI: 10.1136/thorax.58.3.221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Bhowmik A. Should asthma management be guided by airway inflammatory markers instead of symptoms? Thorax 2003. [DOI: 10.1136/thorax.58.2.162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Bhowmik A. Decreases in air pollutants may lead to lower cardiopulmonary mortality. Thorax 2003. [DOI: 10.1136/thorax.58.1.36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Donaldson GC, Seemungal TAR, Bhowmik A, Wedzicha JA. Relationship between exacerbation frequency and lung function decline in chronic obstructive pulmonary disease. Thorax 2002; 57:847-52. [PMID: 12324669 PMCID: PMC1746193 DOI: 10.1136/thorax.57.10.847] [Citation(s) in RCA: 1440] [Impact Index Per Article: 65.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Chronic obstructive pulmonary disease (COPD) is characterised by both an accelerated decline in lung function and periods of acute deterioration in symptoms termed exacerbations. The aim of this study was to investigate whether these are related. METHODS Over 4 years, peak expiratory flow (PEF) and symptoms were measured at home daily by 109 patients with COPD (81 men; median (IQR) age 68.1 (63-74) years; arterial oxygen tension (PaO(2)) 9.00 (8.3-9.5) kPa, forced expiratory volume in 1 second (FEV(1)) 1.00 (0.7-1.3) l, forced vital capacity (FVC) 2.51 (1.9-3.0) l); of these, 32 (29 men) recorded daily FEV(1). Exacerbations were identified from symptoms and the effect of frequent or infrequent exacerbations (> or < 2.92 per year) on lung function decline was examined using cross sectional, random effects models. RESULTS The 109 patients experienced 757 exacerbations. Patients with frequent exacerbations had a significantly faster decline in FEV(1) and peak expiratory flow (PEF) of -40.1 ml/year (n=16) and -2.9 l/min/year (n=46) than infrequent exacerbators in whom FEV(1) changed by -32.1 ml/year (n=16) and PEF by -0.7 l/min/year (n=63). Frequent exacerbators also had a greater decline in FEV(1) if allowance was made for smoking status. Patients with frequent exacerbations were more often admitted to hospital with longer length of stay. Frequent exacerbations were a consistent feature within a patient, with their number positively correlated (between years 1 and 2, 2 and 3, 3 and 4). CONCLUSIONS These results suggest that the frequency of exacerbations contributes to long term decline in lung function of patients with moderate to severe COPD.
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Affiliation(s)
- G C Donaldson
- Academic Unit of Respiratory Medicine, St Bartholomew's and Royal London School of Medicine and Dentistry, UK
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Bhowmik A, Paimela H, Mustonen H, Kivilaakso E. Roles of cytoskeleton and tyrosine receptor mediated signal transduction in the restitution of isolated guinea pig gastric mucosa. Scand J Gastroenterol 2002; 37:759-64. [PMID: 12190087 DOI: 10.1080/00365520213240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND The immediate response of the GI-epithelium to a superficial injury is primarily directed to restore the disturbed epithelial continuity in a process called restitution. The involvement of both structural (cytoskeleton) and humoral (growth factors and cytokines) signal transduction systems in the process has been documented. Previously, in experimental circumstances the role of the two systems has been examined as two distinct units. Nevertheless, in normal conditions in vivo, the two systems are presumably acting simultaneously. This study investigates the functional roles of cytoskeleton and tyrosine receptor mediated signalling in the regulation of restitution. METHODS Guinea pig gastric mucosa was mounted in Ussing-chamber, injured with 1.25 M NaCl and subsequently perfused for 4 h. Simultaneously, the electrophysiological resistance of the tissue (R) was recorded. During the recovery, the tissue was exposed bilaterally either to modulators of cytoskeleton (cytochalasin B/lysophosphatidic acid) or of tyrosine receptor mediated signalling (genistein/epidermal growth factor + transforming growth factor-alpha). After the experiment, the tissue was analysed morphologically and the proliferative index (PI) was determined morphometrically. RESULTS Exposure of the tissue to cytochalasin caused a significant decrease of both restitution (tissue resistance) and proliferation (PI), whereas simultaneous treatment with EGF+ TGFalpha restored both restitution and proliferation. Correspondingly, exposure of the tissue to genistein during restitution impaired the process as well as induction of proliferation, while simultaneous exposure to lysophosphatidic acid restored the processes. Exposure of the tissue to EGF+ TGFalpha and lysophosphatidic acid simultaneously resulted in a mild, but insignificant additive inductions of both restitution and proliferation. CONCLUSIONS Restitution is controlled by both structural and humoral signalling systems. If one of the regulating systems fails, stimulation of the other restores the process. Simultaneous stimulation of both systems has a minor additive effect on both restitution and proliferation.
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Affiliation(s)
- A Bhowmik
- Dept of Surgery, Helsinki University Central Hospital, Finland
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Seemungal T, Harper-Owen R, Bhowmik A, Moric I, Sanderson G, Message S, Maccallum P, Meade TW, Jeffries DJ, Johnston SL, Wedzicha JA. Respiratory viruses, symptoms, and inflammatory markers in acute exacerbations and stable chronic obstructive pulmonary disease. Am J Respir Crit Care Med 2001; 164:1618-23. [PMID: 11719299 DOI: 10.1164/ajrccm.164.9.2105011] [Citation(s) in RCA: 647] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The effects of respiratory viral infection on the time course of chronic obstructive pulmonary disease (COPD) exacerbation were examined by monitoring changes in systemic inflammatory markers in stable COPD and at exacerbation. Eighty-three patients with COPD (mean [SD] age, 66.6 [7.1] yr, FEV(1), 1.06 [0.61] L) recorded daily peak expiratory flow rate and any increases in respiratory symptoms. Nasal samples and blood were taken for respiratory virus detection by culture, polymerase chain reaction, and serology, and plasma fibrinogen and serum interleukin-6 (IL-6) were determined at stable baseline and exacerbation. Sixty-four percent of exacerbations were associated with a cold occurring up to 18 d before exacerbation. Seventy-seven viruses (39 [58.2%] rhinoviruses) were detected in 66 (39.2%) of 168 COPD exacerbations in 53 (64%) patients. Viral exacerbations were associated with frequent exacerbators, colds with increased dyspnea, a higher total symptom count at presentation, a longer median symptom recovery period of 13 d, and a tendency toward higher plasma fibrinogen and serum IL-6 levels. Non-respiratory syncytial virus (RSV) respiratory viruses were detected in 11 (16%), and RSV in 16 (23.5%), of 68 stable COPD patients, with RSV detection associated with higher inflammatory marker levels. Respiratory virus infections are associated with more severe and frequent exacerbations, and may cause chronic infection in COPD. Prevention and early treatment of viral infections may lead to a decreased exacerbation frequency and morbidity associated with COPD.
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Affiliation(s)
- T Seemungal
- Academic Department of Respiratory Medicine and Virology, St. Bartholomew's and Royal London School of Medicine and Dentistry, London, UK
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Roland M, Bhowmik A, Sapsford RJ, Seemungal TA, Jeffries DJ, Warner TD, Wedzicha JA. Sputum and plasma endothelin-1 levels in exacerbations of chronic obstructive pulmonary disease. Thorax 2001; 56:30-5. [PMID: 11120901 PMCID: PMC1745915 DOI: 10.1136/thorax.56.1.30] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Endothelin (ET)-l is a bronchoconstrictor peptide produced in the airways. It has been implicated in the pathogenesis of asthma and virally mediated airway inflammation and may play a role in exacerbations of chronic obstructive pulmonary disease (COPD). METHODS Seventy one patients with COPD were followed prospectively and sampled for plasma and sputum ET-1 levels when stable and during an exacerbation. Sputum was also examined for cytokines, human rhinovirus, and Chlamydia pneumoniae. RESULTS Plasma ET-1 levels were available for 67 patients with stable COPD (mean (SD) 0.58 (0.31) pg/ml); 28 pairs of stable-exacerbation plasma samples had a mean stable ET-1 level of 0.54 (0.30) pg/ml rising to 0.67 (0.35) pg/ml at exacerbation (mean difference 0.13, 95% confidence interval (CI) 0.04 to 0.21, p = 0.004). Plasma ET-1 levels in the 67 patients with stable COPD were inversely correlated with baseline forced expiratory volume in one second (FEV(1); r = -0. 29, p = 0.022) and forced vital capacity (FVC; r = -0.38, p = 0.002). The change in plasma ET-1 levels during an exacerbation correlated with the change in oxygen saturation (SaO(2); r = -0.41, p = 0.036). In 14 stable-exacerbation pairs of sputum samples median stable ET-1 levels were 5.37 (0.97-21.95) pg/ml rising to 34.68 (13.77-51.95) pg/ml during an exacerbation (mean difference 25.14, 95% CI 3.77 to 46.51, p = 0.028). This increase in sputum ET-1 levels correlated with the increase in plasma ET-1 levels (r = 0.917, p = 0.001) and sputum interleukin (IL)-6 levels (r = 0.718, p = 0.013). CONCLUSIONS Sputum levels of ET-1 rise in COPD patients during an exacerbation and this is reflected by a smaller rise in plasma ET-1 levels. ET-1 may have a role in mediating airway inflammatory changes during exacerbations of COPD.
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Affiliation(s)
- M Roland
- Academic Respiratory Medicine and The William Harvey Research Institute, St Bartholomew's and Royal London School of Medicine and Dentistry, London EC1A 7BE, UK
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Abstract
Common colds are associated with exacerbations of chronic obstructive pulmonary disease (COPD). However, the role of the common cold virus (human rhinovirus) in the production of symptoms and lower airway inflammation at COPD exacerbation is unknown. Thirty three patients with moderate-to-severe COPD were seen at baseline, when the number of chest infections in the previous year was noted, and acutely at COPD exacerbation. Within 48 h after the onset of the exacerbation and at baseline, nasal aspirates and induced sputum were taken for rhinovirus reverse transcriptase polymerase chain reaction (RT-PCR) analysis and determination of cytokine levels. Symptoms, recorded on diary cards, were noted and forced expiratory volume in one second (FEV1) and forced vital capacity (FVC) measured. At exacerbation, mean FEV1 and FVC fell significantly from baseline (p<0.001). Ten of 43 exacerbations were associated with rhinovirus infection, detected in induced sputum. In four of these, nasopharyngeal samples contained no detectable rhinovirus. All baseline samples were negative for rhinovirus. The simultaneous presence of increased nasal discharge/nasal congestion (in 26 of the 43 exacerbations) and increased sputum (29 exacerbations) was strongly associated with the presence of rhinovirus (odds ratio 6.15; p=0.036). Total symptom scores were greater for rhinovirus as compared to nonrhinovirus exacerbations (p=0.039). Median baseline sputum interleukin-6 levels rose from 90.2 to 140.3 pg x mL(-1) at exacerbation (p=0.005); the change was greater in the presence of rhinovirus infection (p=0.008). Rhinovirus infection can be detected at chronic obstructive pulmonary disease exacerbation. This is associated with elevation of lower airway interleukin-6 levels, which may mediate lower airway symptom expression during chronic obstructive pulmonary disease exacerbations.
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Affiliation(s)
- T A Seemungal
- Academic Respiratory Medicine, St. Bartholomew's and Royal London School of Medicine and Dentistry, UK
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Wedzicha JA, Seemungal TA, MacCallum PK, Paul EA, Donaldson GC, Bhowmik A, Jeffries DJ, Meade TW. Acute exacerbations of chronic obstructive pulmonary disease are accompanied by elevations of plasma fibrinogen and serum IL-6 levels. Thromb Haemost 2000; 84:210-5. [PMID: 10959691] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
BACKGROUND Respiratory tract infections may acutely increase risk from coronary heart disease (CHD), though the mechanisms have not been defined. Patients with chronic obstructive pulmonary disease (COPD) are prone to repeated exacerbations that are often associated with respiratory infections. These patients also have increased cardiovascular morbidity and mortality. We hypothesized that transient acute increases in plasma fibrinogen, an independent risk factor for CHD, could occur at COPD exacerbation (mediated through a rise in IL6) and thereby provide a mechanism linking respiratory infection to risk of coronary heart disease. METHODS 93 COPD patients [mean (SD) age 66.8 (8.1) years] were followed regularly over one year, with daily diary card monitoring of respiratory symptoms and peak expiratory flow rate (PEFR); 67 patients [mean FEV1 1.06 (0.44) l, FVC 2.43 (0.79) l] were seen during 120 exacerbations. At each visit spirometry was measured and blood samples taken for plasma fibrinogen and Interleukin-6 (IL-6) levels. RESULT At baseline, the mean (SD) plasma fibrinogen was elevated at 3.9 (0.67) g/l in the 67 patients with exacerbations during the study and the median (IQR) IL-6 at 4.3 (2.4 to 6.8) pg/ml. Plasma fibrinogen increased by 0.36 (0.74) g/l at exacerbation (p <0.001). with IL-6 levels rising by 1.10 (-2.73 to 6.95) pg/ml (p = 0.008). There was a relation between the changes in fibrinogen at exacerbation and IL-6 levels (r = 0.348, p <0.001). Multiple regression revealed significantly greater rises in fibrinogen when exacerbations were associated with purulent sputum (b = 0.34 g/l; p = 0.03), increased cough (b = 0.31 g/l, p = 0.019) and symptomatic colds (b = 0.228; p = 0.024). CONCLUSIONS Plasma fibrinogen levels were elevated in stable patients with COPD and may contribute to the increased cardiovascular morbidity and mortality in these patients. COPD exacerbations increased serum IL-6 levels, leading to a rise in plasma fibrinogen. Thus acute rather than chronic infection may have a role in predisposing to coronary heart disease or stroke.
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Affiliation(s)
- J A Wedzicha
- Department of Academic Respiratory Medicine, St Bartholomew's and Royal London School of Medicine and Dentistry, Queen Mary and Westfield College, London, UK.
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Abstract
Greater urban violence has resulted in an increased incidence of penetrating neck trauma. Penetrating neck wounds can present difficult diagnostic and therapeutic dilemmas. The evaluation and management of such injuries, however, remains controversial. There is no universally accepted specific approach to the management of patients with penetrating neck injuries, with some surgeons advocating mandatory neck exploration whilst others believe in selective surgical intervention. We believe that an equal willingness for both conservative and surgical intervention as dictated by serial bedside evaluation with adequate radiological and endoscopic support can provide the clinician a safe and effective means of managing a potentially complex and lethal problem.
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Affiliation(s)
- M Tariq
- Department of Otolaryngology, Medway Maritime Hospital, Gillingham, Kent, UK.
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Seemungal TA, Donaldson GC, Bhowmik A, Jeffries DJ, Wedzicha JA. Time course and recovery of exacerbations in patients with chronic obstructive pulmonary disease. Am J Respir Crit Care Med 2000; 161:1608-13. [PMID: 10806163 DOI: 10.1164/ajrccm.161.5.9908022] [Citation(s) in RCA: 782] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Although exacerbations of chronic obstructive pulmonary disease (COPD) are associated with symptomatic and physiological deterioration, little is known of the time course and duration of these changes. We have studied symptoms and lung function changes associated with COPD exacerbations to determine factors affecting recovery from exacerbation. A cohort of 101 patients with moderate to severe COPD (mean FEV(1) 41.9% predicted) were studied over a period of 2.5 yr and regularly followed when stable and during 504 exacerbations. Patients recorded daily morning peak expiratory flow rate (PEFR) and changes in respiratory symptoms on diary cards. A subgroup of 34 patients also recorded daily spirometry. Exacerbations were defined by major symptoms (increased dyspnea, increased sputum purulence, increased sputum volume) and minor symptoms. Before onset of exacerbation there was deterioration in the symptoms of dyspnea, sore throat, cough, and symptoms of a common cold (all p < 0.05), but not lung function. Larger falls in PEFR were associated with symptoms of increased dyspnea (p = 0.014), colds (p = 0.047), or increased wheeze (p = 0.009) at exacerbation. Median recovery times were 6 (interquartile range [IQR] 1 to 14) d for PEFR and 7 (IQR 4 to 14) d for daily total symptom score. Recovery of PEFR to baseline values was complete in only 75.2% of exacerbations at 35 d, whereas in 7.1% of exacerbations at 91 d PEFR recovery had not occurred. In the 404 exacerbations where recovery of PEFR to baseline values was complete at 91 d, increased dyspnea and colds at onset of exacerbation were associated with prolonged recovery times (p < 0.001 in both cases). Symptom changes during exacerbation do not closely reflect those of lung function, but their increase may predict exacerbation, with dyspnea or colds characterizing the more severe. Recovery is incomplete in a significant proportion of COPD exacerbations.
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Affiliation(s)
- T A Seemungal
- Academic Respiratory Medicine, Physiology, and Virology, St. Bartholomew's and Royal London School of Medicine and Dentistry, Queen Mary and Westfield College, London, United Kingdom
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Abstract
BACKGROUND Although it is presumed that exacerbations of chronic obstructive pulmonary disease (COPD) are associated with increased airway inflammation, there is little information available on inflammatory markers during an exacerbation and the relationship with severity or time course of recovery. A study was undertaken to investigate the sputum cell and cytokine characteristics of COPD when stable and during an exacerbation. METHODS Induced sputum samples from 57 patients with moderate to severe COPD were analysed (44 samples were taken during a stable period and 37 during an exacerbation). The patients recorded daily symptoms on diary cards. Cell counts and sputum levels of interleukin (IL)-6 and IL-8 were measured. RESULTS Patients with >/=3 exacerbations/year had higher median stable sputum levels of IL-6 (110 (95% CI 11 to 215) pg/ml) and IL-8 (6694 (95% CI 3120 to 11995) pg/ml) than those with </=2 exacerbations/year (22 (95% CI 12 to 93) and 1628 (95% CI 607 to 4812) pg/ml, respectively). Median IL-6 levels were increased during exacerbations compared with stable conditions. The levels of IL-6 during exacerbations were related to the presence of a cold and to the total cell count and eosinophil and lymphocyte numbers, while IL-8 was positively correlated with all sputum cell counts. Sputum cell counts and cytokine levels during an exacerbation did not predict the size and duration of lung function changes in the exacerbation. CONCLUSIONS Patients with more frequent exacerbations have higher baseline sputum cytokine levels, which may predict the frequency of future exacerbations.
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Affiliation(s)
- A Bhowmik
- Academic Respiratory Medicine, St Bartholomew's and Royal London School of Medicine and Dentistry, St Bartholomew's Hospital, London EC1A 7BE, UK
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Bhowmik A, Seemungal TA, Sapsford RJ, Devalia JL, Wedzicha JA. Comparison of spontaneous and induced sputum for investigation of airway inflammation in chronic obstructive pulmonary disease. Thorax 1998; 53:953-6. [PMID: 10193394 PMCID: PMC1745116 DOI: 10.1136/thx.53.11.953] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND Although sputum induction is used as a technique to investigate lower airway inflammation in asthmatic subjects, advantages over spontaneous sputum in patients with chronic obstructive pulmonary disease (COPD) have not been investigated. METHODS Samples of spontaneous sputum and sputum induced with 3% hypertonic saline for 14 minutes were collected from 27 patients with chronic obstructive pulmonary disease (COPD) who usually produced spontaneous sputum. Spirometric indices and oxygen saturation (Sao2) were measured at seven minute intervals. The spontaneous, seven and 14 minute sputum samples were analysed for total and differential cell counts, cell viability, and interleukin 8 levels. RESULTS Analysis of the sputum revealed that median cell viability was higher in the seven minute (62.8%; p = 0.004) and 14 minute (65%; p = 0.001) induced sputum samples than in spontaneous sputum (41.2%). There was no significant difference in total and differential cell counts or in interleukin 8 levels between spontaneous and induced sputum. During the sputum induction procedure the mean (SD) fall in forced expiratory volume in one second (FEV1) was 0.098 (0.111) 1 (p < 0.001) and in forced vital capacity (FVC) was 0.247 (0.233) 1 (p < 0.001). There was a small but significant fall in Sao2 during sputum induction (p = 0.03). CONCLUSIONS Induced sputum contains a higher proportion of viable cells than spontaneous sputum. There are no significant differences between the sputum samples obtained at seven minutes and at 14 minutes of hypertonic saline nebulisation. Sputum induction is safe and well tolerated in patients with COPD.
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Affiliation(s)
- A Bhowmik
- Academic Department of Respiratory Medicine, St Bartholomew's, London, UK
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Bhowmik A, Paimela H, Joutsi T, Alanko T, Paavonen T, Saksela O, Kivilaakso E. Induction of proliferation in isolated guinea pig gastric epithelium during restitution after superficial injury. Dig Dis Sci 1998; 43:1507-12. [PMID: 9690387 DOI: 10.1023/a:1018810830803] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Immediate repair of the gastrointestinal epithelium after superficial injury is called restitution. It is based on the migration of the surviving mucoid neck cells over the area of injury. The involvement of growth factors in the process has been recently documented. They are known to enhance the process (ie, EGF, FGF, TGF-beta) and to activate the basolateral Na+-H+-antiport (EGF). They may exert their effect by activating intracellular tyrosine kinases or by inducing chemotaxis. Yet, their precise mechanism of action in the process is unknown. The aim of the present study was to investigate the effect of modulation of the signal transduction pathway on the occurrence of proliferative mucoid neck and foveolar cells in guinea pig gastric epithelium. Therefore guinea pig gastric epithelium was mounted in Ussing chambers in vitro and perfused 4 hr after superficial injury with 1.25 M NaCl. The potential difference over the epithelium and tissue resistance were recorded simultaneously. The tissue was exposed either to cycloheximide, genistein, or to 4-phorbol myristate 13-acetate (PMA) during the 4-hr recovery, and the expression of proliferative cells was assessed by staining the tissue for proliferative cells (Ki-67). The mean proliferative index of tissues subjected to NaCl injury was significantly higher than that of uninjured control tissues after 4 hr of restitution. Inhibition of the signaling pathway with genistein decreased the proliferative index significantly, while its stimulation with phorbol myristate increased it. Both electrophysiologic and morphologic restitution were sensitive to genistein, but not to PMA or cycloheximide. Superficial epithelial injury results in a significantly increased occurrence of proliferative cells in isolated guinea pig gastric epithelium. This endogenous activation of the tissue is sensitive to inhibition by tyrosine kinases and to stimulation by protein kinases. Electrophysiologic and morphologic recovery are also affected by the modulation of the signaling pathway. This suggests that it is involved in the immediate repair process.
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Affiliation(s)
- A Bhowmik
- II Department of Surgery, Helsinki University Central Hospital and the Haartman Institute, Helsinki University, Finland
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Joutsi T, Paimela H, Bhowmik A, Kiviluoto T, Kivilaakso E. Role of Na(+)-H(+)-antiport in restitution of isolated guinea pig gastric epithelium after superficial injury. Dig Dis Sci 1996; 41:2187-94. [PMID: 8943971 DOI: 10.1007/bf02071399] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In addition to its pHi regulatory function Na(+)-H(+)-antiport is also involved in volume regulation of epithelial cells, particularly in neutral conditions. It is also known that the antiport is activated after ligand binding following growth factor receptor activation. The aim of the present study was to evaluate the role of the antiport in restitution of gastric mucosa and whether its activity is dependent on the type of superficial injury. Therefore the fundic epithelium of guinea pig stomach was perfused in an Ussing chamber in neutral conditions. Na(+)-H(+)- and Cl(-)-HCO3(-)-antiports were inhibited with 1.0 mM amiloride, 1.0 mM SITS, or with HCO3- removal and Na(+)-K(+)-2Cl(2-)-cotransporter with 0.3 M furosemide during 4 hr of restitution after superficial injury induced either by 1.25 M NaCl or by 1.0% Triton. Luminal exposure of the epithelium to amiloride had no effect on restitution but serosal application abolished the process completely. The inhibitory effect of amiloride was similar after both NaCl and Triton injury. The inhibition of Cl(-)-HCO3(-)-antiport with SITS interfered with the process as well, while HCO3- removal had no significant inhibitory effect, nor did the inhibition of Na(+)-K(+)-2Cl(-)-cotransporter. The morphologic findings were in accordance with the electrophysiologic measurements in each pair of tissues. It is concluded that the Na(+)-H(+)-antiport is essential for the epithelial cells during restitution even in neutral conditions, but a functional Cl(-)-HCO3(-)-antiport is also required. The activity of Na(+)-H(+)-antiport is sensitive to basolateral amiloride and is necessary regardless of the type of chemical injury.
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Affiliation(s)
- T Joutsi
- II Department of Surgery, Helsinki University Central Hospital, Finland
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