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Gao W, Anna Valdimarsdóttir U, Hauksdóttir A, Eyrún Torfadóttir J, Kirschbaum C. The assessment of endocannabinoids and N-acylethanolamines in human hair: Associations with sociodemographic and psychological variables. Clin Chim Acta 2022; 537:1-8. [DOI: 10.1016/j.cca.2022.09.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/27/2022] [Accepted: 09/27/2022] [Indexed: 11/24/2022]
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Xue J, Zartarian V, Tornero-Velez R, Stanek LW, Poulakos A, Walts A, Triantafillou K, Suero M, Grokhowsky N. A Generalizable Evaluated Approach, Applying Advanced Geospatial Statistical Methods, to Identify High Lead Exposure Locations at Census Tract Scale: Michigan Case Study. ENVIRONMENTAL HEALTH PERSPECTIVES 2022; 130:77004. [PMID: 35894594 PMCID: PMC9327739 DOI: 10.1289/ehp9705] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 05/24/2022] [Accepted: 06/13/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Despite great progress in reducing environmental lead (Pb) levels, many children in the United States are still being exposed. OBJECTIVE Our aim was to develop a generalizable approach for systematically identifying, verifying, and analyzing locations with high prevalence of children's elevated blood Pb levels (EBLLs) and to assess available Pb models/indices as surrogates, using a Michigan case study. METHODS We obtained ∼1.9 million BLL test results of children <6 years of age in Michigan from 2006-2016; we then evaluated them for data representativeness by comparing two percentage EBLL (%EBLL) rates (number of children tested with EBLL divided by both number of children tested and total population). We analyzed %EBLLs across census tracts over three time periods and between two EBLL reference values (≥5 vs. ≥10μg/dL) to evaluate consistency. Locations with high %EBLLs were identified by a top 20 percentile method and a Getis-Ord Gi* geospatial cluster "hotspot" analysis. For the locations identified, we analyzed convergences with three available Pb exposure models/indices based on old housing and sociodemographics. RESULTS Analyses of 2014-2016 %EBLL data identified 11 Michigan locations via cluster analysis and 80 additional locations via the top 20 percentile method and their associated census tracts. Data representativeness and consistency were supported by a 0.93 correlation coefficient between the two EBLL rates over 11 y, and a Kappa score of ∼0.8 of %EBLL hotspots across the time periods (2014-2016) and reference values. Many EBLL hotspot locations converge with current Pb exposure models/indices; others diverge, suggesting additional Pb sources for targeted interventions. DISCUSSION This analysis confirmed known Pb hotspot locations and revealed new ones at a finer geographic resolution than previously available, using advanced geospatial statistical methods and mapping/visualization. It also assessed the utility of surrogates in the absence of blood Pb data. This approach could be applied to other states to inform Pb mitigation and prevention efforts. https://doi.org/10.1289/EHP9705.
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Affiliation(s)
- Jianping Xue
- U.S. Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, North Carolina, USA
| | - Valerie Zartarian
- U.S. Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, North Carolina, USA
| | - Rogelio Tornero-Velez
- U.S. Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, North Carolina, USA
| | - Lindsay W. Stanek
- U.S. Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, North Carolina, USA
| | - Antonios Poulakos
- U.S. Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, North Carolina, USA
- LinTech Global, Inc., Boston, Massachusetts, USA
| | - Alan Walts
- U.S. EPA, Region 5, Chicago, Illinois, USA
| | | | | | - Nicholas Grokhowsky
- Oak Ridge Institute for Science and Education, Research Triangle Park, North Carolina, USA
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Urushidani M, Kawayoshi A, Kotaki T, Saeki K, Mori Y, Kameoka M. Inactivation of SARS-CoV-2 and influenza A virus by dry fogging hypochlorous acid solution and hydrogen peroxide solution. PLoS One 2022; 17:e0261802. [PMID: 35389997 PMCID: PMC8989197 DOI: 10.1371/journal.pone.0261802] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 03/23/2022] [Indexed: 11/26/2022] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of coronavirus disease 2019 (COVID-19), is transmitted mainly by droplet or aerosol infection; however, it may also be transmitted by contact infection. SARS-CoV-2 that adheres to environmental surfaces remains infectious for several days. We herein attempted to inactivate SARS-CoV-2 and influenza A virus adhering to an environmental surface by dry fogging hypochlorous acid solution and hydrogen peroxide solution. SARS-CoV-2 and influenza virus were air-dried on plastic plates and placed into a test chamber for inactivation by the dry fogging of these disinfectants. The results obtained showed that the dry fogging of hypochlorous acid solution and hydrogen peroxide solution inactivated SARS-CoV-2 and influenza A virus in CT value (the product of the disinfectant concentration and contact time)-dependent manners. SARS-CoV-2 was more resistant to the virucidal effects of aerosolized hypochlorous acid solution and hydrogen peroxide solution than influenza A virus; therefore, higher concentrations of disinfectants or longer contact times were required to inactivate SARS-CoV-2 than influenza A virus. The present results provide important information for the development of a strategy that inactivates SARS-CoV-2 and influenza A virus on environmental surfaces by spatial fogging.
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Affiliation(s)
| | - Akira Kawayoshi
- Disinfection Division, H. Ikeuchi & Co., Ltd., Nishiwaki, Hyogo, Japan
| | - Tomohiro Kotaki
- Division of Global Infectious Diseases, Department of Public Health, Kobe University Graduate School of Health Sciences, Kobe, Hyogo, Japan
- Department of Virology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
| | - Keiichi Saeki
- Laboratory of Microbiology and Immunology, Graduate School of Agricultural Science, Kobe University, Kobe, Hyogo, Japan
| | - Yasuko Mori
- Division of Clinical Virology, Center for Infectious Diseases, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| | - Masanori Kameoka
- Division of Global Infectious Diseases, Department of Public Health, Kobe University Graduate School of Health Sciences, Kobe, Hyogo, Japan
- * E-mail:
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Urushidani M, Kawayoshi A, Kotaki T, Saeki K, Mori Y, Kameoka M. Inactivation of SARS-CoV-2 and influenza A virus by dry fogging hypochlorous acid solution and hydrogen peroxide solution. PLoS One 2022; 17:e0261802. [PMID: 35389997 DOI: 10.1101/2021.12.13.472413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 03/23/2022] [Indexed: 05/27/2023] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of coronavirus disease 2019 (COVID-19), is transmitted mainly by droplet or aerosol infection; however, it may also be transmitted by contact infection. SARS-CoV-2 that adheres to environmental surfaces remains infectious for several days. We herein attempted to inactivate SARS-CoV-2 and influenza A virus adhering to an environmental surface by dry fogging hypochlorous acid solution and hydrogen peroxide solution. SARS-CoV-2 and influenza virus were air-dried on plastic plates and placed into a test chamber for inactivation by the dry fogging of these disinfectants. The results obtained showed that the dry fogging of hypochlorous acid solution and hydrogen peroxide solution inactivated SARS-CoV-2 and influenza A virus in CT value (the product of the disinfectant concentration and contact time)-dependent manners. SARS-CoV-2 was more resistant to the virucidal effects of aerosolized hypochlorous acid solution and hydrogen peroxide solution than influenza A virus; therefore, higher concentrations of disinfectants or longer contact times were required to inactivate SARS-CoV-2 than influenza A virus. The present results provide important information for the development of a strategy that inactivates SARS-CoV-2 and influenza A virus on environmental surfaces by spatial fogging.
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Affiliation(s)
| | - Akira Kawayoshi
- Disinfection Division, H. Ikeuchi & Co., Ltd., Nishiwaki, Hyogo, Japan
| | - Tomohiro Kotaki
- Division of Global Infectious Diseases, Department of Public Health, Kobe University Graduate School of Health Sciences, Kobe, Hyogo, Japan
- Department of Virology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
| | - Keiichi Saeki
- Laboratory of Microbiology and Immunology, Graduate School of Agricultural Science, Kobe University, Kobe, Hyogo, Japan
| | - Yasuko Mori
- Division of Clinical Virology, Center for Infectious Diseases, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| | - Masanori Kameoka
- Division of Global Infectious Diseases, Department of Public Health, Kobe University Graduate School of Health Sciences, Kobe, Hyogo, Japan
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Brown F, Jeffries O, Gissane C, Howatson G, van Someren K, Pedlar C, Myers T, Hill JA. Custom-Fitted Compression Garments Enhance Recovery From Muscle Damage in Rugby Players. J Strength Cond Res 2022; 36:212-219. [PMID: 32091467 DOI: 10.1519/jsc.0000000000003408] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
Abstract
ABSTRACT Brown, F, Jeffries, O, Gissane, C, Howatson, G, van Someren, K, Pedlar, C, Myers, T, and Hill, JA. Custom-fitted compression garments enhance recovery from muscle damage in rugby players. J Strength Cond Res 36(1): 212-219, 2022-to evaluate the effects of custom-fitted compression garments (CG) on recovery from muscle damage in rugby players. Forty-five players were tested for lower-body strength, power, and indices of muscle damage before completing a damaging protocol (20 × 20-m sprints with 5-m deceleration, 100 drop jumps). Players were randomly assigned to wear either custom-fitted (CF, n = 13), or standard-sized CG (SSG, n = 16), or to receive sham ultrasound therapy (CON, n = 16) immediately after exercise. Players were retested immediately, then after 24 and 48 hours. Strength recovery was significantly different between groups (F = 2.7, p = 0.02), with only CF recovering to baseline values by 48 hours (p = 0.973). Time × condition effects were also apparent for creatine kinase activity (χ2 = 30.4, p < 0.001) and midthigh girth (F = 3.7, p = 0.005), with faster recovery apparent in CF compared with both CON and SSG (p < 0.05). Custom-fitted CG improved strength recovery and indices of muscle damage in rugby players, compared with controls and standard-sized garments. Athletes and coaches would be advised to use appropriately fitted CG to enhance strength recovery after damaging exercise.
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Affiliation(s)
- Freddy Brown
- School of Sport, Health and Applied Science, St. Mary's University, Twickenham, United Kingdom
- Faculty of Health & Life Sciences, Coventry University, Coventry, United Kingdom
| | - Owen Jeffries
- School of Sport, Health and Applied Science, St. Mary's University, Twickenham, United Kingdom
- School of Biomedical Science, Newcastle University, Newcastle Upon Tyne, United Kingdom
| | - Conor Gissane
- School of Sport, Health and Applied Science, St. Mary's University, Twickenham, United Kingdom
| | - Glyn Howatson
- Faculty of Health and Life of Sciences, Northumbria University, Newcastle Upon Tyne, United Kingdom
- Water Research Group, Northwest University, Potchefstroom, South Africa
| | - Ken van Someren
- Faculty of Health and Life of Sciences, Northumbria University, Newcastle Upon Tyne, United Kingdom
| | - Charles Pedlar
- School of Sport, Health and Applied Science, St. Mary's University, Twickenham, United Kingdom
- Cardiovascular Performance Program, Massachusetts General Hospital, Boston, Massachusetts; and
| | - Tony Myers
- Physical Education and Sports Studies, Newman University College, Birmingham, United Kingdom
| | - Jessica A Hill
- School of Sport, Health and Applied Science, St. Mary's University, Twickenham, United Kingdom
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Ranta J, Mikkelä A, Suomi J, Tuominen P. BIKE: Dietary Exposure Model for Foodborne Microbiological and Chemical Hazards. Foods 2021; 10:2520. [PMID: 34828801 PMCID: PMC8621415 DOI: 10.3390/foods10112520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/22/2021] [Accepted: 09/24/2021] [Indexed: 11/20/2022] Open
Abstract
BIKE is a Bayesian dietary exposure assessment model for microbiological and chemical hazards. A graphical user interface was developed for running the model and inspecting the results. It is based on connected Bayesian hierarchical models, utilizing OpenBUGS and R in tandem. According to occurrence and consumption data given as inputs, a specific BUGS code is automatically written for running the Bayesian model in the background. The user interface is based on shiny app. Chronic and acute exposures are estimated for chemical and microbiological hazards, respectively. Uncertainty and variability in exposures are visualized, and a few optional model structures can be used. Simulated synthetic data are provided with BIKE for an example, resembling real occurrence and consumption data. BIKE is open source and available from github.
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Affiliation(s)
- Jukka Ranta
- Risk Assessment Unit, Finnish Food Authority, 00790 Helsinki, Finland; (A.M.); (J.S.); (P.T.)
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Relf RL, Lee BJ, Eichhorn G, Flint MS, Beale L, Maxwell N. Thermoregulation is not impaired in breast cancer survivors during moderate-intensity exercise performed in warm and hot environments. Physiol Rep 2021; 9:e14968. [PMID: 34291605 PMCID: PMC8295682 DOI: 10.14814/phy2.14968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 06/17/2021] [Accepted: 06/22/2021] [Indexed: 11/30/2022] Open
Abstract
This study aimed to assess how female breast cancer survivors (BCS) respond physiologically, hematologically, and perceptually to exercise under heat stress compared to females with no history of breast cancer (CON). Twenty-one females (9 BCS and 12 CON [age; 54 ± 7 years, stature; 167 ± 6 cm, body mass; 68.1 ± 7.62 kg, and body fat; 30.9 ± 3.8%]) completed a warm (25℃, 50% relative humidity, RH) and hot (35℃, 50%RH) trial in a repeated-measures crossover design. Trials consisted of 30 min of rest, 30 min of walking at 4 metabolic equivalents, and a 6-minute walk test (6MWT). Physiological measurements (core temperature (Tre ), skin temperature (Tskin ), heart rate (HR), and sweat analysis) and perceptual rating scales (ratings of perceived exertion, thermal sensation [whole body and localized], and thermal comfort) were taken at 5- and 10-min intervals throughout, respectively. Venous blood samples were taken before and after to assess; IL-6, IL-10, CRP, IFN-γ, and TGF-β1 . All physiological markers were higher during the 35 versus 25℃ trial; Tre (~0.25℃, p = 0.002), Tskin (~3.8℃, p < 0.001), HR (~12 beats·min-1 , p = 0.023), and whole-body sweat rate (~0.4 L·hr-1 , p < 0.001), with no difference observed between groups in either condition (p > 0.05). Both groups covered a greater 6MWT distance in 25 versus 35℃ (by ~200 m; p = 0.003). Nevertheless, the control group covered more distance than BCS, regardless of environmental temperature (by ~400 m, p = 0.03). Thermoregulation was not disadvantaged in BCS compared to controls during moderate-intensity exercise under heat stress. However, self-paced exercise performance was reduced for BCS regardless of environmental temperature.
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Affiliation(s)
- Rebecca L. Relf
- Environmental Extremes LaboratoryUniversity of BrightonEastbourneUK
| | - Ben J. Lee
- Occupational and Environmental Physiology GroupCoventry UniversityCoventryUK
| | - Gregor Eichhorn
- Environmental Extremes LaboratoryUniversity of BrightonEastbourneUK
| | - Melanie S. Flint
- Cancer Stress LaboratoryUniversity of BrightonMoulsecoombUK
- Centre for Stress and Age‐Related DiseaseBrightonEast SussexUK
| | - Louisa Beale
- Environmental Extremes LaboratoryUniversity of BrightonEastbourneUK
| | - Neil Maxwell
- Environmental Extremes LaboratoryUniversity of BrightonEastbourneUK
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De María M, Silva-Sanchez C, Kroll KJ, Walsh MT, Nouri MZ, Hunter ME, Ross M, Clauss TM, Denslow ND. Chronic exposure to glyphosate in Florida manatee. ENVIRONMENT INTERNATIONAL 2021; 152:106493. [PMID: 33740675 DOI: 10.1016/j.envint.2021.106493] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/24/2021] [Accepted: 02/26/2021] [Indexed: 05/25/2023]
Abstract
Florida manatees depend on freshwater environments as a source of drinking water and as warm-water refuges. These freshwater environments are in direct contact with human activities where glyphosate-based herbicides are being used. Glyphosate is the most used herbicide worldwide and it is intensively used in Florida as a sugarcane ripener and to control invasive aquatic plants. The objective of the present study was to determine the concentration of glyphosate and its breakdown product, aminomethylphosphonic acid (AMPA), in Florida manatee plasma and assess their exposure to manatees seeking a warm-water refuge in Crystal River (west central Florida), and in South Florida. We analyzed glyphosate's and AMPA's concentrations in Florida manatee plasma (n = 105) collected during 2009-2019 using HPLC-MS/MS. We sampled eight Florida water bodies between 2019 and 2020, three times a year: before, during and after the sugarcane harvest using grab samples and molecular imprinted passive Polar Organic Chemical Integrative Samplers (MIP-POCIS). Glyphosate was present in 55.8% of the sampled Florida manatees' plasma. The concentration of glyphosate has significantly increased in Florida manatee samples from 2009 until 2019. Glyphosate and AMPA were ubiquitous in water bodies. The concentration of glyphosate and AMPA was higher in South Florida than in Crystal River, particularly before and during the sugarcane harvest when Florida manatees depend on warm water refuges. Based on our results, Florida manatees were chronically exposed to glyphosate and AMPA, during and beyond the glyphosate applications to sugarcane, possibly associated with multiple uses of glyphosate-based herbicides for other crops or to control aquatic weeds. This chronic exposure in Florida water bodies may have consequences for Florida manatees' immune and renal systems which may further be compounded by other environmental exposures such as red tide or cold stress.
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Affiliation(s)
- Maite De María
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA; Aquatic Animal Health Program, College of Veterinary Medicine, University of Florida, PO Box 100136, Gainesville, FL 32610, USA.
| | - Cecilia Silva-Sanchez
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA.
| | - Kevin J Kroll
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA.
| | - Michael T Walsh
- Aquatic Animal Health Program, College of Veterinary Medicine, University of Florida, PO Box 100136, Gainesville, FL 32610, USA.
| | - Mohammad-Zaman Nouri
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA.
| | - Margaret E Hunter
- U.S. Geological Survey, Wetland and Aquatic Research Center, Gainesville, FL 32653, United States.
| | - Monica Ross
- Clearwater Marine Aquarium, 249 Windward Passage, Clearwater, FL 33767, USA.
| | - Tonya M Clauss
- Georgia Aquarium, Atlanta, Georgia, 225 Baker Street Northwest, Atlanta, GA 30313, USA.
| | - Nancy D Denslow
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA; Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA.
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Detection of Rotavirus Vaccine Strains in Oysters and Sewage and Their Relationship with the Gastroenteritis Epidemic. Appl Environ Microbiol 2021; 87:AEM.02547-20. [PMID: 33712423 DOI: 10.1128/aem.02547-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 03/01/2021] [Indexed: 12/15/2022] Open
Abstract
Rotavirus is one of the major causes of infectious gastroenteritis among infants and children, and live attenuated vaccines for rotavirus A (RVA), namely, Rotarix and RotaTeq, have recently become available in Japan. Rotavirus is known to be excreted from patients and accumulated in oysters similar to norovirus; however, the vaccine strains in aquatic environments or oysters have not yet been analyzed. In this study, we focused on wild-type RVA, which is highly important in considering the risk of infectious diseases. We quantified total RVA, Rotarix, and RotaTeq strains in oyster and sewage samples collected between September 2014 and July 2016 to assess the contamination levels of wild-type RVA by subtracting the quantitative value of rotavirus vaccine strains from that of total RVA. The positive rates of wild-type RVA, Rotarix, and RotaTeq in oysters were 54, 14, and 31%, respectively. These rates were comparable to those of wild-type RVA (57%) and RotaTeq (35%) in sewage; however, Rotarix was not detected in any sewage samples. The comparison of viral concentrations in oysters and sewage suggested more efficient accumulation of the vaccine strains in oysters than the wild-type RVA. The concentration of wild-type RVA in oysters was significantly correlated with that in sewage with a lag time of -6 to 0 weeks which is required for viral transportation from wastewater treatment plants to oysters. On the other hand, no significant correlation was observed between wild-type RVA concentration in sewage and the number of rotavirus-associated gastroenteritis cases, implying the existence of asymptomatic RVA-infected individuals.IMPORTANCE We quantified rotavirus A (RVA), Rotarix, and RotaTeq strains in oyster and sewage samples during two gastroenteritis seasons and revealed the exact contamination of wild-type RVA by subtracting the quantitative value of rotavirus vaccine strains from that of RVA. The concentration of wild-type RVA was significantly correlated between oysters and sewage, although no significant correlation was seen between wild-type RVA concentration in sewage and the number of rotavirus-associated gastroenteritis cases. This finding suggested the existence of asymptomatic patients and that monitoring of rotavirus vaccine strain could be useful to understand the trend of wild-type RVA and rotavirus outbreak in detail. We believe that our study makes a significant contribution to the literature because it reports the detection of rotavirus vaccine strains in oysters.
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Suzuki Y, Tanaka N, Akiyama H. Attempt of Bayesian Estimation from Left-censored Data Using the Markov Chain Monte Carlo Method: Exploring Cr(VI) Concentrations in Mineral Water Products. Food Saf (Tokyo) 2020; 8:67-89. [PMID: 33409115 PMCID: PMC7765759 DOI: 10.14252/foodsafetyfscj.d-20-00007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 10/14/2020] [Indexed: 11/26/2022] Open
Abstract
Hexavalent chromium (Cr(VI)) is toxic, carcinogenic, and mutagenic substances. Oral exposure to Cr(VI) is thought to be primarily from drinking water. However, under the certain reporting limit (~0.1 µg/L), percentage of Cr(VI) concentration in mineral water products under the reporting limit were estimated higher than 50%. Data whose values are below certain limits and thus cannot be accurately determined are known as left-censored. The high censored percentage leads to estimation of Cr(VI) exposure uncertain. It is well known that conventional substitution method often used in food analytical science cause severe bias. To estimate appropriate summary statistics on Cr(VI) concentration in mineral water products, parameter estimation using the Markov chain Monte Carlo (MCMC) method under assumption of a lognormal distribution was performed. Stan, a probabilistic programming language, was used for MCMC. We evaluated the accuracy, coverage probability, and reliability of estimates with MCMC by comparison with other estimation methods (discard nondetects, substituting half of reporting limit, Kaplan-Meier, regression on order statistics, and maximum likelihood estimation) using 1000 randomly generated data subsets (n = 150) with the obtained parameters. The evaluation shows that MCMC is the best estimation method in this context with greater accuracy, coverage probability, and reliability over a censored percentage of 10-90%. The mean concentration, which was estimated with MCMC, was 0.289×10-3 mg/L and this value was sufficiently lower than the regulated value of 0.05 mg/L stipulated by the Food Sanitation Act.
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Affiliation(s)
- Yoshinari Suzuki
- Division of Foods, National Institute of Health Science,
Tonomachi 3-25-26, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
| | - Noriko Tanaka
- Department of Health Data Science Research, Healthy Aging
Innovation Center, Tokyo Metropolitan Geriatric Medical Center, Sakae-cho 35-2,
Itabashi-ku, Tokyo 173-0015, Japan
| | - Hiroshi Akiyama
- Division of Foods, National Institute of Health Science,
Tonomachi 3-25-26, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
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Meszaros M, Kis A, Kunos L, Tarnoki AD, Tarnoki DL, Lazar Z, Bikov A. The role of hyaluronic acid and hyaluronidase-1 in obstructive sleep apnoea. Sci Rep 2020; 10:19484. [PMID: 33173090 PMCID: PMC7655850 DOI: 10.1038/s41598-020-74769-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 10/06/2020] [Indexed: 12/20/2022] Open
Abstract
Biological functions of hyaluronic acid (HA) depend on its molecular size. High-molecular weight HA (HMW-HA) is an important component of the endothelial wall and has anti-inflammatory and antioxidant properties. Under inflammation or hypoxia, HMW-HA is degraded by hyaluronidases, such as HYAL-1 resulting in pro-inflammatory low-molecular weight fragments. Obstructive sleep apnoea (OSA) is characterised by intermittent hypoxia and systemic inflammation. Our aim was to evaluate circulating HMW-HA and HYAL-1 in OSA. We recruited 68 patients with OSA and 40 control volunteers. After full-night sleep study blood samples were taken for HMW-HA and HYAL-1 measurements. HYAL-1 levels were significantly higher in patients with OSA compared to controls (0.59/0.31-0.88/ng/mL vs. 0.31/0.31-0.58/ng/mL; p = 0.005) after adjustment for gender, age, BMI and smoking. There was a trend for reduced HMW-HA concentrations in OSA (31.63/18.11-59.25/ng/mL vs. 46.83/25.41-89.95/ng/mL; p = 0.068). Significant correlation was detected between circulating HMW-HA and apnoea-hypopnoea-index (r = - 0.195, p = 0.043), HYAL-1 and apnoea-hypopnoea-index (r = 0.30, p < 0.01) as well as oxygen desaturation index (r = 0.26, p < 0.01). Our results suggest that chronic hypoxia is associated with increased plasma HYAL-1 concentration and accelerated HMW-HA degradation. Altered hyaluronan metabolism may be involved in the inflammatory cascade potentially leading to endothelial dysfunction in OSA.
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Affiliation(s)
- Martina Meszaros
- Department of Pulmonology, Semmelweis University, Budapest, 1083, Hungary.
| | - Adrian Kis
- Department of Pulmonology, Semmelweis University, Budapest, 1083, Hungary
| | - Laszlo Kunos
- Department of Pulmonology, Semmelweis University, Budapest, 1083, Hungary
| | | | | | - Zsofia Lazar
- Department of Pulmonology, Semmelweis University, Budapest, 1083, Hungary
| | - Andras Bikov
- Manchester University NHS Foundation Trust, Manchester, M13 9WL, UK
- Division of Infection, Immunity and Respiratory Medicine, University of Manchester, Manchester, M13 9NT, UK
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Cates KA, Atkinson S, Pack AA, Straley JM, Gabriele CM, Yin S. Corticosterone in central North Pacific male humpback whales (Megaptera novaeangliae): Pairing sighting histories with endocrine markers to assess stress. Gen Comp Endocrinol 2020; 296:113540. [PMID: 32585212 DOI: 10.1016/j.ygcen.2020.113540] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/08/2020] [Accepted: 06/13/2020] [Indexed: 10/24/2022]
Abstract
Developing a better understanding of the stress response is critical to ensuring the health and sustainability of marine mammal populations. However, accurately measuring and interpreting a stress response in free-ranging, large cetaceans is a nascent field. Here, an enzyme immunoassay for corticosterone was validated for use in biopsy samples from male humpback whales (Megaptera novaeangliae). Analyses were conducted on 247 male North Pacific humpback whale blubber samples, including 238 non-calves and 9 calves that were collected on the Hawaiian breeding and Southeast Alaskan feeding grounds from 2004 to 2006. Significant relationships were found when corticosterone concentrations were examined by year, age class and distribution between locations. When examined by year, corticosterone concentrations for male humpback whales were higher in Hawaii in 2004 than in 2005 and 2006 (p < 0.05). Corticosterone concentration also varied by age class with initially high concentrations at birth which subsequently tapered off and remained relatively low until sexual maturity was reached around age 8-10 years. Corticosterone concentrations appeared to peak in male humpback whales around 15-25 years of age. Blubber biopsies from Alaska and Hawaii had similar mean corticosterone concentrations, yet the variability in these samples was much greater for whales located in Hawaii. It is clear that much work remains to be done in order to accurately define or monitor a stress response in male humpback whales and that specific attention is required when looking at age, sex, and yearly trends. Our results suggest that a stress response may be most impacted by age and yearly oceanographic conditions and needs to be initially examined at the individual level.
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Affiliation(s)
- Kelly A Cates
- University of Alaska Fairbanks, College of Fisheries and Ocean Sciences, Fisheries Department, Juneau Center, 17101 Pt. Lena Loop Road, Juneau, Alaska 99801, USA.
| | - Shannon Atkinson
- University of Alaska Fairbanks, College of Fisheries and Ocean Sciences, Fisheries Department, Juneau Center, 17101 Pt. Lena Loop Road, Juneau, Alaska 99801, USA
| | - Adam A Pack
- Departments of Psychology and Biology, University of Hawai'i at Hilo, 200 West Kawili Street, Hilo, Hawai'i 96720, USA; The Dolphin Institute, P.O. Box 6279, Hilo, Hawai'i 96720, USA
| | - Janice M Straley
- University of Alaska Southeast Sitka Campus, 1332 Seward Ave., Sitka, Alaska 99835, USA
| | | | - Suzanne Yin
- Hawai'i Marine Mammal Consortium, P.O. Box 6107, Kamuela, Hawai'i 96743, USA
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He H, Tang W, Kelly T, Li S, He J. Statistical tests for latent class in censored data due to detection limit. Stat Methods Med Res 2020; 29:2179-2197. [PMID: 31736411 PMCID: PMC7231674 DOI: 10.1177/0962280219885985] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Measures of substance concentration in urine, serum or other biological matrices often have an assay limit of detection. When concentration levels fall below the limit, the exact measures cannot be obtained. Instead, the measures are censored as only partial information that the levels are under the limit is known. Assuming the concentration levels are from a single population with a normal distribution or follow a normal distribution after some transformation, Tobit regression models, or censored normal regression models, are the standard approach for analyzing such data. However, in practice, it is often the case that the data can exhibit more censored observations than what would be expected under the Tobit regression models. One common cause is the heterogeneity of the study population, caused by the existence of a latent group of subjects who lack the substance measured. For such subjects, the measurements will always be under the limit. If a censored normal regression model is appropriate for modeling the subjects with the substance, the whole population follows a mixture of a censored normal regression model and a degenerate distribution of the latent class. While there are some studies on such mixture models, a fundamental question about testing whether such mixture modeling is necessary, i.e. whether such a latent class exists, has not been studied yet. In this paper, three tests including Wald test, likelihood ratio test and score test are developed for testing the existence of such latent class. Simulation studies are conducted to evaluate the performance of the tests, and two real data examples are employed to illustrate the tests.
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Affiliation(s)
- Hua He
- Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA
| | - Wan Tang
- Department of Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA
| | - Tanika Kelly
- Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA
| | - Shengxu Li
- Children’s Minnesota Research Institute, Children’s Hospitals and Clinics of Minnesota Medicine, Minneapolis, MN, USA
| | - Jiang He
- Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA
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Ochoa-Grullón J, Orte C, Rodríguez de la Peña A, Guevara-Hoyer K, Cordero Torres G, Fernández-Arquero M, Serrano-García I, Recio M, Pérez de Diego R, Sánchez-Ramón S. Typhim vi immunization assists to discriminate primary antibody responses in hematological malignancies. MethodsX 2020; 7:100936. [PMID: 32551240 PMCID: PMC7289764 DOI: 10.1016/j.mex.2020.100936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 05/20/2020] [Indexed: 11/25/2022] Open
Abstract
Typhim Vi response have been proposed as a new strategy for the assessment of specific polysaccharide antibody response in SID due to HM. Different biostatistical methodologies may stablish the best cut-off value to discriminate Typhim Vi response. Typhim Vi IgG responses may better discriminate primary Ab responses showing relevant clinical correlate.
Assessment of specific antibody (Ab) production to polysaccharide antigens is clinically relevant, identifying patients at risk for infection by encapsulated bacteria and thus enabling a more rigorous selection of patients that can benefit of immunoglobulin replacement therapy. Classically, the gold-standard test is the measurement of antibody production to pure polysaccharide pneumococcal (PPV) immunization. Several factors, including introduction of conjugate vaccination schedule, serotyping analysis, high baseline Ab levels, have hindered the evaluation of polysaccharide antigens. This is even more difficult in secondary immunodeficiencies (SID), where patients can show secondary responses despite lack of primary antibody responses and present with recurrent or severe infections. Assessment of specific Ab production to pure Salmonella typhi Vi polysaccharide (TV) immunization has been proposed as a complementary test to PPV, given its low seroprevalence. To set the optimal cut-off value for PPV and TV response in SID, we tested different biostatistical methodologies, including ROC analysis, Youden index, Union index and Closest-topleft in a cohort of 42 SID patients and 24 healthy controls. The statistically chosen cut-offs value pre-post TV Ab ratio was ≥5, (sensitivity of 90%, specificity of 100%) and a postvaccination TV concentration of 28.5 U/mL (sensitivity of 90%, specificity of 95%), showing relevant clinical correlate.
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Affiliation(s)
- J. Ochoa-Grullón
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University School of Medicine, Madrid, Spain
- Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
| | - C. Orte
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain
| | | | - K. Guevara-Hoyer
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University School of Medicine, Madrid, Spain
- Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
| | - G. Cordero Torres
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain
| | - M. Fernández-Arquero
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain
| | - I. Serrano-García
- Department of Epidemiology and Preventive Medicine, Hospital Clínico San Carlos, Madrid, Spain
| | - M.J. Recio
- Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
- Laboratory of Immunogenetics of Human Diseases, IdiPAZ Institute for Health Research, Madrid, Spain
| | - R. Pérez de Diego
- Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
- Laboratory of Immunogenetics of Human Diseases, IdiPAZ Institute for Health Research, Madrid, Spain
| | - S. Sánchez-Ramón
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University School of Medicine, Madrid, Spain
- Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
- Corresponding author
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Cates KA, Atkinson S, Gabriele CM, Pack AA, Straley JM, Yin S. Testosterone trends within and across seasons in male humpback whales (Megaptera novaeangliae) from Hawaii and Alaska. Gen Comp Endocrinol 2019; 279:164-173. [PMID: 30904390 DOI: 10.1016/j.ygcen.2019.03.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Revised: 03/18/2019] [Accepted: 03/18/2019] [Indexed: 11/30/2022]
Abstract
Understanding reproductive profiles and timing of reproductive events is essential in the management and conservation of humpback whales (Megaptera novaeangliae). Yet compared to other parameters and life history traits, such as abundance, migratory trends, reproductive rates, behavior and communication, relatively little is known about variations in reproductive physiology, especially in males. Here, an enzyme immunoassay (EIA) for testosterone was validated for use in biopsy samples from male humpback whales. Analyses were conducted on 277 North Pacific male humpback whale blubber samples, including 268 non-calves and 9 calves that were collected in the Hawaiian breeding grounds and the Southeast Alaskan feeding grounds from 2004 to 2006. Testosterone concentrations (ng/g) were significantly different between non-calves sampled in Hawaii (n = 182) and Alaska (n = 86, p < 0.05) with peak testosterone concentrations occurring in the winter (January-March) and the lowest concentrations occurring in the summer (June-September). Fall and spring showed increasing and decreasing trends in testosterone concentrations, respectively. Blubber testosterone concentrations in non-calves and calves sampled in Alaska were not significantly different. Blubber and skin from the same individual biopsies (n = 37) were also compared, with blubber having significantly higher testosterone concentrations (p < 0.05) than skin samples. We found variability in testosterone concentration with age, suggesting that male humpbacks reach peak lifetime testosterone concentrations in the breeding grounds around age 8-25 years. The testosterone profile of male humpback whales follows a predictable pattern for capital breeders, where testosterone begins to increase prior to the breeding season, stimulating the onset of spermatogenesis. Incorporation of reproductive hormonal profiles into our overall understanding of humpback whale physiology will shed additional light on the timing of reproduction and overall health of the recently delisted Hawaii distinct population segment (DPS).
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Affiliation(s)
- Kelly A Cates
- University of Alaska Fairbanks, College of Fisheries and Ocean Sciences, Fisheries Department, Juneau Center, 17101 Pt. Lena Loop Road, Juneau, AK 99801, United States
| | - Shannon Atkinson
- University of Alaska Fairbanks, College of Fisheries and Ocean Sciences, Fisheries Department, Juneau Center, 17101 Pt. Lena Loop Road, Juneau, AK 99801, United States.
| | | | - Adam A Pack
- Departments of Psychology and Biology, University of Hawai'i at Hilo, 200 West Kawili Street, Hilo, HI 96720, United States; The Dolphin Institute, P.O. Box 6279, Hilo, HI 96720, United States
| | - Janice M Straley
- University of Alaska Southeast Sitka Campus, 1332 Seward Ave., Sitka, AK 99835, United States
| | - Suzanne Yin
- Hawai'i Marine Mammal Consortium, P.O. Box 6107 Kamuela, HI 96743, United States
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Weekly Variation of Rotavirus A Concentrations in Sewage and Oysters in Japan, 2014-2016. Pathogens 2019; 8:pathogens8030089. [PMID: 31247997 PMCID: PMC6789866 DOI: 10.3390/pathogens8030089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 06/03/2019] [Accepted: 06/23/2019] [Indexed: 01/07/2023] Open
Abstract
Concentrations of rotavirus A, in sewage and oysters collected weekly from September 2014 to April 2016 in Japan, were investigated using RT-qPCR; results showed up to 6.5 log10 copies/mL and 4.3 log10 copies/g of digestive tissue (DT) in sewage and oysters, respectively. No correlation was found between rotavirus concentration in sewage and oysters and cases of rotavirus-associated gastroenteritis.
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Koivisto AE, Olsen T, Paur I, Paulsen G, Bastani NE, Garthe I, Raastad T, Matthews J, Blomhoff R, Bøhn SK. Effects of antioxidant-rich foods on altitude-induced oxidative stress and inflammation in elite endurance athletes: A randomized controlled trial. PLoS One 2019; 14:e0217895. [PMID: 31194785 PMCID: PMC6563980 DOI: 10.1371/journal.pone.0217895] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Accepted: 05/17/2019] [Indexed: 12/27/2022] Open
Abstract
Background Various altitude training regimes, systematically used to improve oxygen carrying capacity and sports performance, have been associated with increased oxidative stress and inflammation. We investigated whether increased intake of common antioxidant-rich foods attenuates these processes. Methods In a randomized controlled trial, 31 elite endurance athletes (23 ± 5 years), ingested antioxidant-rich foods (n = 16), (> doubling their usual intake), or eucaloric control foods (n = 15) during a 3-week altitude training camp (2320 m). Fasting blood and urine samples were collected 7 days pre-altitude, after 5 and 18 days at altitude, and 7 days post-altitude. Change over time was compared between the groups using mixed models for antioxidant capacity [uric acid-free (ferric reducing ability of plasma (FRAP)], oxidative stress (8-epi-PGF2α) and inflammatory biomarkers (IFNγ, IL1α, IL1RA, IL1β, IL2, IL5, IL6, IL7, IL10, IL12p70, IL13, IL17, TNFα, MCP-1 and micro-CRP). The cytokine response to a stress-test (VO2max ramp test or 100 m swimming) was assessed at pre- and post-altitude. Results FRAP increased more in the antioxidant compared to the control group (p = 0.034). IL13 decreased in the antioxidant group, while increasing in the controls (p = 0.006). A similar trend was seen for IL6 (p = 0.062). A larger decrease in micro-CRP was detected in the antioxidant group compared to controls (β: -0.62, p = 0.02). We found no group differences for the remaining cytokines. 8-epi-PGF2α increased significantly in the whole population (p = 0.033), regardless group allocation. The stress response was significantly larger post-altitude compared with pre-altitude for IL1β, IL6, IL7, IL13, IL12p70 and TNFα, but we found no group differences. Conclusions Increased intake of antioxidant-rich foods elevated the antioxidant capacity and attenuated some of the altitude-induced systemic inflammatory biomarkers in elite athletes. The antioxidant intervention had no impact on the altitude-induced oxidative stress or changes in acute cytokine responses to exercise stress-tests.
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Affiliation(s)
- Anu Elisa Koivisto
- Norwegian Olympic Sports Centre, Norwegian Olympic and Paralympic Committee and Confederation of Sports, Oslo, Norway
| | - Thomas Olsen
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Ingvild Paur
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
- Division of Clinical Service, Division of Cancer Medicine, Oslo University Hospital, Oslo, Norway
| | - Gøran Paulsen
- Norwegian Olympic Sports Centre, Norwegian Olympic and Paralympic Committee and Confederation of Sports, Oslo, Norway
- Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway
| | | | - Ina Garthe
- Norwegian Olympic Sports Centre, Norwegian Olympic and Paralympic Committee and Confederation of Sports, Oslo, Norway
| | - Truls Raastad
- Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway
| | - Jason Matthews
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Rune Blomhoff
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
- Division of Clinical Service, Division of Cancer Medicine, Oslo University Hospital, Oslo, Norway
| | - Siv Kjølsrud Bøhn
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
- Department of Chemistry, Biotechnology and Food Sciences, Norwegian University of Life Sciences, Ås, Norway
- * E-mail:
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18
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Lee WC, Sinha SK, Arbuckle TE, Fisher M. Estimation in generalized linear models under censored covariates with an application to MIREC data. Stat Med 2018; 37:4539-4556. [PMID: 30168157 DOI: 10.1002/sim.7942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 06/25/2018] [Accepted: 07/22/2018] [Indexed: 11/07/2022]
Abstract
In many biological experiments, certain values of a biomarker are often nondetectable due to low concentrations of an analyte or the limitations of a chemical analysis device, resulting in left-censored values. There is an increasing demand for the analysis of data subject to detection limits in clinical and environmental studies. In this paper, we develop a novel statistical method for the maximum likelihood estimation in generalized linear models with covariates subject to detection limits. Simulations are carried out to study the relative performance of the proposed estimators, as compared to other existing estimators. The proposed method is also applied to a real dataset from the Maternal-Infant Research on Environmental Chemicals cohort study, where we investigate how different chemical mixtures affect the health outcomes of infants and pregnant women.
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Affiliation(s)
- Wan-Chen Lee
- Environmental Health Science and Research Bureau, Health Canada, Ottawa, Canada
| | - Sanjoy K Sinha
- School of Mathematics and Statistics, Carleton University, Ottawa, Canada
| | - Tye E Arbuckle
- Environmental Health Science and Research Bureau, Health Canada, Ottawa, Canada
| | - Mandy Fisher
- Environmental Health Science and Research Bureau, Health Canada, Ottawa, Canada
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19
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Mendelson F, Griesel R, Tiffin N, Rangaka M, Boulle A, Mendelson M, Maartens G. C-reactive protein and procalcitonin to discriminate between tuberculosis, Pneumocystis jirovecii pneumonia, and bacterial pneumonia in HIV-infected inpatients meeting WHO criteria for seriously ill: a prospective cohort study. BMC Infect Dis 2018; 18:399. [PMID: 30107791 PMCID: PMC6092834 DOI: 10.1186/s12879-018-3303-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 08/01/2018] [Indexed: 01/10/2023] Open
Abstract
Background Tuberculosis, bacterial community-acquired pneumonia (CAP), and Pneumocystis jirovecii pneumonia (PJP) are the three commonest causes of hospitalisation in HIV-infected adults. Prompt diagnosis and treatment initiation are important to reduce morbidity and mortality, but are hampered by limited diagnostic resources in resource poor settings. C-reactive protein (CRP) and procalcitonin have shown diagnostic utility for respiratory tract infections, however few studies have focussed on their ability to distinguish between tuberculosis, CAP, and PJP in HIV-infected inpatients. Methods We evaluated the diagnostic accuracy of CRP and procalcitonin, compared with composite reference standards, to discriminate between the three target infections in adult HIV-infected inpatients in two district level hospitals in Cape Town, South Africa. Participants were admitted with current cough and danger signs in accordance with the WHO algorithm for tuberculosis in seriously ill HIV-infected patients. Study clinicians were blinded to CRP and procalcitonin results. Results Two hundred forty-eight participants met study case definitions: 133 with tuberculosis, 61 with CAP, 16 with PJP, and 38 with mixed infection. In the 210 particpants with single infections the differences in median CRP and procalcitonin concentrations between the three infections were statistically significant, but distributions overlapped considerably. CRP and procalcitonin concentrations were highest in the CAP group and lowest in the PJP group. CRP and procalcitonin cut-offs with sensitivities of ≥90% were found for all three target infection pairs, but corresponding specificities were low. Highest receiver operating characteristic areas under the curve for CRP and procalcitonin were for PJP versus tuberculosis and PJP versus CAP (0.68 and 0.71, and 0.74 and 0.69 respectively). Conclusions CRP and procalcitonin showed limited value in discriminating between the three target infections due to widely overlapping distributions, but diagnostic accuracy was higher for discriminating PJP from CAP or tuberculosis. Our findings show limitations for CRP and procalcitonin, particularly for discriminiation of tuberculosis form CAP, however they may have greater diagnostic utility as part of a panel of biomarkers or in clinical prediction rules. Electronic supplementary material The online version of this article (10.1186/s12879-018-3303-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Fiona Mendelson
- School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa
| | - Rulan Griesel
- Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Nicki Tiffin
- School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.,Centre for Infectious Diseases Research Initiative, Institute of Infectious Diseases & Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Molebogeng Rangaka
- Department of Infection & Population Health, Institute of Global Health, University College London, London, UK.,Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Andrew Boulle
- School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.,Centre for Infectious Diseases Research Initiative, Institute of Infectious Diseases & Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Marc Mendelson
- Division of Infectious Diseases and HIV Medicine, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Gary Maartens
- Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, Cape Town, South Africa.
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Hu JM, Zhuang LH, Bernardo BA, McCandless LC. Statistical Challenges in the Analysis of Biomarkers of Environmental Chemical Exposures for Perinatal Epidemiology. CURR EPIDEMIOL REP 2018. [DOI: 10.1007/s40471-018-0156-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Lee H, Lee D, Park JH, Song SH, Jeong IG, Kim CS, Searson PC, Lee KH. High throughput differential identification of TMPRSS2-ERG fusion genes in prostate cancer patient urine. Biomaterials 2017; 135:23-29. [DOI: 10.1016/j.biomaterials.2017.04.049] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 04/26/2017] [Accepted: 04/27/2017] [Indexed: 12/18/2022]
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22
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Willemsen SP, Russo CM, Lesaffre E, Leão D. Flexible multivariate nonlinear models for bioequivalence problems. STAT MODEL 2017. [DOI: 10.1177/1471082x17706018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Modelling the concentration of a drug in the bloodstream over time is usually done using compartment models. In pharmacokinetic data, they turn into highly nonlinear mixed-effects models (NLMEMs) when we take the heterogeneity between subjects into account. Fitting of NLMEMs can be difficult and may involve complex algorithms, with convergence critically depending on the initial values and maybe requiring data transformations. In this article, we propose a flexible alternative to the usual parametric compartment models, inspired by the Multivariate SuperImposition by Translation and Rotation (MSITAR) model but adapted to be applicable in this new field. A fully parametric one-compartment NLMEM is considered for comparison. We make use of a Bayesian approach and illustrate the method on a real dataset where the interest lies in contrasting the average and individual bioequivalence of a test and reference formulation of an anti-hypertensive drug.
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Affiliation(s)
- Sten P Willemsen
- Department of Biostatistics, Erasmus Medical Center Rotterdam, The Netherlands
| | - Cibele M Russo
- Instituto de Ciências Matemáticas e de Computação, Universidade de São Paulo, São Carlos, SP, Brazil
| | - Emmanuel Lesaffre
- Department of Biostatistics, Erasmus Medical Center Rotterdam, The Netherlands
- L-BioStat, KU Leuven, Leuven, Belgium
| | - Dorival Leão
- Instituto de Ciências Matemáticas e de Computação, Universidade de São Paulo, São Carlos, SP, Brazil
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HIV persistence in tissue macrophages of humanized myeloid-only mice during antiretroviral therapy. Nat Med 2017; 23:638-643. [PMID: 28414330 PMCID: PMC5419854 DOI: 10.1038/nm.4319] [Citation(s) in RCA: 212] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 03/13/2017] [Indexed: 12/23/2022]
Abstract
Despite years of fully suppressive antiretroviral therapy (ART), HIV persists in the host and is never eradicated. One major barrier to eradication is that multiple different cell types are infected that may individually contribute to HIV persistence. Tissue macrophages are critical contributors to HIV disease (1–3); however, their specific role in HIV persistence during long-term suppressive ART has not been established (4–6). Using humanized myeloid-only mice (MoM), we demonstrate that HIV infection of tissue macrophages is rapidly suppressed by ART, as determined by a rapid drop in plasma viral load and a dramatic drop in the levels of cell-associated viral RNA and DNA. No virus rebound was observed in the plasma of 67% of the ART treated animals at seven weeks post-ART interruption, and no replication competent virus was rescued from the tissue macrophages obtained from these animals. In contrast, in a subset of animals (~33%), a significantly delayed viral rebound was observed that is consistent with the establishment of persistent infection in tissue macrophages. These observations represent the first direct evidence of HIV persistence in tissue macrophages in vivo.
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24
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Jia B, Chang YCI, Wang Z. Assessing the diagnostic power of variables measured with a detection limit. Comput Stat 2015. [DOI: 10.1007/s00180-015-0628-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Delamaide Gasper JA, Barnes Heller HL, Robertson M, Trepanier LA. Therapeutic serum phenobarbital concentrations obtained using chronic transdermal administration of phenobarbital in healthy cats. J Feline Med Surg 2015; 17:359-63. [PMID: 25098448 PMCID: PMC11104151 DOI: 10.1177/1098612x14545141] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
Seizures are a common cause of neurologic disease, and phenobarbital (PB) is the most commonly used antiepileptic drug. Chronic oral dosing can be challenging for cat owners, leading to poor compliance. The purpose of this study was to determine if the transdermal administration of PB could achieve serum PB concentrations of between 15 and 45 μg/ml in healthy cats. Nineteen healthy cats were enrolled in three groups. Transdermal PB in pluronic lecithin organogel (PLO) was applied to the pinnae for 14 days at a dosage of 3 mg/kg q12h in group 1 (n = 6 cats) and 9 mg/kg q12h in group 2 (n = 7 cats). Transdermal PB in Lipoderm Activemax was similarly applied at 9 mg/kg q12h for 14 days in group 3 (n = 6 cats). Steady-state serum PB concentrations were measured at trough, and at 2, 4 and 6 h after the morning dose on day 15. In group 1, median concentrations ranged from 6.0-7.5 μg/ml throughout the day (observed range 0-11 μg/ml). Group 2 median concentrations were 26.0 μg/ml (observed range 18.0-37.0 μg/ml). For group 3, median concentrations ranged from 15.0-17.0 μg/ml throughout the day (range 5-29 μg/ml). Side effects were mild. One cat was withdrawn from group 2 owing to ataxia and sedation. These results show therapeutic serum PB concentrations can be achieved in cats following chronic transdermal administration of PB in PLO at a dosage of 9 mg/kg q12h. More individual variation was noted using Lipoderm Activemax. Transdermal administration may be an alternative for cats that are difficult to medicate orally.
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Affiliation(s)
- Joy A Delamaide Gasper
- Department of Medical Sciences, University of Wisconsin-Madison, School of Veterinary Medicine, Madison, WI, USA
| | - Heidi L Barnes Heller
- Department of Medical Sciences, University of Wisconsin-Madison, School of Veterinary Medicine, Madison, WI, USA
| | - Michelle Robertson
- UW Veterinary Care Pharmacy, University of Wisconsin-Madison, School of Veterinary Medicine, Madison, WI, USA
| | - Lauren A Trepanier
- Department of Medical Sciences, University of Wisconsin-Madison, School of Veterinary Medicine, Madison, WI, USA
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Muscatell KA, Dedovic K, Slavich GM, Jarcho MR, Breen EC, Bower JE, Irwin MR, Eisenberger NI. Greater amygdala activity and dorsomedial prefrontal-amygdala coupling are associated with enhanced inflammatory responses to stress. Brain Behav Immun 2015; 43:46-53. [PMID: 25016200 PMCID: PMC4368432 DOI: 10.1016/j.bbi.2014.06.201] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 06/20/2014] [Accepted: 06/29/2014] [Indexed: 12/27/2022] Open
Abstract
Psychological stress is implicated in the etiology of many common chronic diseases and mental health disorders. Recent research suggests that inflammation may be a key biological mediator linking stress and health. Nevertheless, the neurocognitive pathways underlying stress-related increases in inflammatory activity are largely unknown. The present study thus examined associations between neural and inflammatory responses to an acute laboratory-based social stressor. Healthy female participants (n=31) were exposed to a brief episode of stress while they underwent an fMRI scan. Blood samples were taken before and after the stressor, and plasma was assayed for markers of inflammatory activity. Exposure to the stressor was associated with significant increases in feelings of social evaluation and rejection, and with increases in levels of inflammation. Analyses linking the neural and inflammatory data revealed that heightened neural activity in the amygdala in response to the stressor was associated with greater increases in inflammation. Functional connectivity analyses indicated that individuals who showed stronger coupling between the amygdala and the dorsomedial prefrontal cortex (DMPFC) also showed a heightened inflammatory response to the stressor. Interestingly, activity in a different set of neural regions was related to increases in feelings of social rejection. These data show that greater amygdala activity in response to a stressor, as well as tighter coupling between the amygdala and the DMPFC, are associated with greater increases in inflammatory activity. Results from this study begin to identify neural mechanisms that might link stress with increased risk for inflammation-related disorders such as cardiovascular disease and depression.
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Affiliation(s)
- Keely A. Muscatell
- Robert Wood Johnson Foundation Health and Society Scholars Program, University of California, San Francisco and University of California, Berkeley, San Francisco, CA, USA,Department of Psychology, University of California, Los Angeles, Los Angeles, CA, USA
| | - Katarina Dedovic
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA, USA,Department of Psychiatry, Research Centre of the Douglas Mental Health University Institute, Montreal, Quebec, Canada
| | - George M. Slavich
- Department of Psychiatry & Biobehavioral Sciences and Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, USA
| | - Michael R. Jarcho
- Department of Psychiatry & Biobehavioral Sciences and Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, USA,Department of Neuroscience, Loras College, Dubuque, IA, USA
| | - Elizabeth C. Breen
- Department of Psychiatry & Biobehavioral Sciences and Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, USA
| | - Julienne E. Bower
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA, USA,Department of Psychiatry & Biobehavioral Sciences and Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, USA
| | - Michael R. Irwin
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA, USA,Department of Psychiatry & Biobehavioral Sciences and Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, USA
| | - Naomi I. Eisenberger
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA, USA,Corresponding author. Address: UCLA Psychology Department, Box 951563, 1285 Franz Hall, Los Angeles, CA 90095-1563, USA. (N.I. Eisenberger)
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