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In vitro method to study antifungal perfusion in Candida biofilms 2005 Oral Bioscience, Faculty of Dentistry, The University of Hong Kong, Hong Kong, SAR, People's Republic of China.
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Journal of clinical microbiology
Periodical, Abbrev.
J.Clin.Microbiol.
Pub Date Free Form
Feb
Volume
43
Issue
2
Start Page
818
Other Pages
825
Notes
LR: 20140608; JID: 7505564; 0 (Antifungal Agents); 7XU7A7DROE (Amphotericin B); 8VZV102JFY (Fluconazole); D83282DT06 (Flucytosine); OID: NLM: PMC548120; ppublish
Place of Publication
United States
ISSN/ISBN
0095-1137; 0095-1137
Accession Number
PMID: 15695686
Language
eng
SubFile
Journal Article; IM
DOI
43/2/818 [pii]
Output Language
Unknown(0)
PMID
15695686
Abstract
Antimycotic perfusion through Candida biofilms was demonstrated by a modification of a simple in vitro diffusion cell bioassay system. Using this model, the perfusion of three commonly used antifungal agents, amphotericin B, fluconazole, and flucytosine, was investigated in biofilms of three different Candida species (i.e., Candida albicans, Candida parapsilosis, and Candida krusei) that were developed on microporous filters. Scanning electron microscopy revealed that C. albicans formed a contiguous biofilm with tightly packed blastospores and occasional hyphae compared with C. parapsilosis and C. krusei, which developed confluent biofilms displaying structural heterogeneity and a lesser cell density, after 48 h of incubation on nutrient agar. Minor structural changes were also perceptible on the superficial layers of the biofilm after antifungal perfusion. The transport of antifungals to the distal biofilm-substratum interface was most impeded by C. albicans biofilms in comparison to C. parapsilosis and C. krusei. Fluconazole and flucytosine demonstrated similar levels of perfusion, while amphotericin B was the least penetrant through all three biofilms, although the latter appeared to cause the most structural damage to the superficial cells of the biofilm compared with the other antifungals. These results suggest that the antifungal perfusion through biofilm mode of growth in Candida is dependent both on the antimycotic and the Candida species in question, and in clinical terms, these phenomena could contribute to the failure of Candida biofilm-associated infections. Finally, the in vitro model we have described should serve as a useful system to investigate the complex interactions that appear to operate in vivo within the biofilm-antifungal interphase.
Descriptors
Amphotericin B/metabolism/pharmacology, Antifungal Agents/metabolism/pharmacology, Biofilms/drug effects/growth & development, Biological Assay, Candida/classification/drug effects/growth & development/ultrastructure, Candida albicans/drug effects/growth & development/ultrastructure, Drug Resistance, Fungal, Fluconazole/metabolism/pharmacology, Flucytosine/metabolism/pharmacology, Humans, Microbial Sensitivity Tests/methods, Micropore Filters/microbiology, Microscopy, Electron, Scanning
Links
Book Title
Database
Publisher
Data Source
Authors
Samaranayake,Y. H., Ye,J., Yau,J. Y., Cheung,B. P., Samaranayake,L. P.
Original/Translated Title
URL
Date of Electronic
PMCID
PMC548120
Editors
Smoke constituent exposure and smoking topography of adolescent daily cigarette smokers 2004 Capital University School of Nursing, Columbus, Ohio, USA.
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco
Periodical, Abbrev.
Nicotine Tob.Res.
Pub Date Free Form
Oct
Volume
6
Issue
5
Start Page
853
Other Pages
862
Notes
LR: 20151119; GR: 1 F31 NR07460/NR/NINR NIH HHS/United States; GR: M01RR00034/RR/NCRR NIH HHS/United States; JID: 9815751; 0 (Ganglionic Stimulants); 6M3C89ZY6R (Nicotine); 7U1EE4V452 (Carbon Monoxide); K5161X06LL (Cotinine); ppublish
Place of Publication
England
ISSN/ISBN
1462-2203; 1462-2203
Accession Number
PMID: 15700921
Language
eng
SubFile
Journal Article; Research Support, U.S. Gov't, P.H.S.; IM
DOI
Output Language
Unknown(0)
PMID
15700921
Abstract
Adolescent smoking prevalence is a major health concern, with 24.4% reporting smoking in the past 30 days and 15.8% considered daily smokers. The purpose of this study was to characterize biobehavioral nicotine dependence, smoke constituent exposure and smoking topography in adolescent daily smokers. Relationships among biological markers of nicotine dependence (nicotine boost, carbon monoxide [CO] boost and cotinine levels) with existing self-report measures (modified Fagerstrom Tolerance Questionnaire [mFTQ] and the motivations for smoking scale) were examined. Gender differences were characterized. Fifty adolescents 13-18 years old were recruited for the study, 50% female. CO, plasma nicotine levels pre- and postcigarette, cotinine, and smoking topography were measured during a smoking bout with participant's usual cigarette. Average CO boost, pre- to postcigarette was 7.2 + 3.6 ppm, baseline cotinine level averaged 224.0 +/- 169.6 ng/ml and nicotine boost averaged 23.4 +/- 21.7 ng/ml. Mean puffs per cigarette was 14.2 +/- 6.3. Males had significantly higher total puff volumes, but similar smoke constituent exposure to females, and higher handling of cigarettes as smoking motive. In regression analysis, 35% of variance in tobacco use, as indicated by baseline cotinine concentration, was explained by maximum puff duration, postcigarette CO level, and nicotine dependence, as measured by the mFTQ. Results indicated adolescents had considerable smoke constituent exposure and nicotine dependence suggesting the importance of appropriate smoking cessation treatment.
Descriptors
Adolescent, Adolescent Behavior, Carbon Monoxide/analysis, Cotinine/analysis, Cross-Sectional Studies, Female, Ganglionic Stimulants/pharmacology, Humans, Male, Nicotine/pharmacology, Sex Factors, Smoking/psychology, Smoking Cessation, Tobacco Use Disorder/physiopathology/psychology
Links
Book Title
Database
Publisher
Data Source
Authors
Wood,T., Wewers,M. E., Groner,J., Ahijevych,K.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
Soil factors controlling mineral N uptake by Picea engelmannii seedlings: the importance of gross NH4+ production rates 2005 Departement de Biologie, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R1, Canada.
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
The New phytologist
Periodical, Abbrev.
New Phytol.
Pub Date Free Form
Mar
Volume
165
Issue
3
Start Page
791
Other Pages
799
Notes
LR: 20151119; JID: 9882884; 0 (Minerals); 0 (Nitrates); 0 (Quaternary Ammonium Compounds); 0 (Soil); N762921K75 (Nitrogen); ppublish
Place of Publication
England
ISSN/ISBN
0028-646X; 0028-646X
Accession Number
PMID: 15720690
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
NPH1289 [pii]
Output Language
Unknown(0)
PMID
15720690
Abstract
* Hydroponic studies suggest that plant nitrogen (N) demand determines the rate of mineral N uptake; however, field observations show N limitation to be widespread. Field experiments are needed to understand soil factors controlling mineral N uptake. * We planted Picea engelmannii seedlings that had initially been grown from sterilized seeds, on a recently clearcut site. We applied a hybrid isotope dilution/pulse labelling technique to compare the gross production rate, concomitantly to the plant uptake rate, of soil mineral N. We also measured mineral N concentrations, microbial N, and percent ectomycorrhizal root tips. * Gross NH4+ production rate was the most important determinant of plant uptake rate. Exploratory path analysis suggested that plant uptake was also determined by microbial N, which was, in turn, determined by soil mineral N concentrations. Percent ectomycorrhizal root tips was negatively related to gross NO3- production rate and microbial N concentrations. * We conclude that nutrient flux density is important in controlling plant uptake. Mycorrhizal colonization may alter N dynamics in the rhizosphere without affecting mineral N uptake by seedlings.
Descriptors
Biological Transport, Active, Minerals/metabolism, Nitrates/metabolism, Nitrogen/metabolism, Picea/metabolism, Plant Roots/metabolism, Quaternary Ammonium Compounds/metabolism, Seedlings/metabolism, Soil/analysis
Links
Book Title
Database
Publisher
Data Source
Authors
Grenon,F., Bradley,R. L., Jones,M. D., Shipley,B., Peat,H.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
Effect of bleaching and repolishing procedures on coffee and tea stain removal from three anterior composite veneering materials 2004 School of Dentistry, Department of Restorative Dentistry and Endodontics, Ege University, Izmir, Turkey. sebnemturkun@hotmail.com
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ...[et al.]
Periodical, Abbrev.
J.Esthet.Restor.Dent.
Pub Date Free Form
Volume
16
Issue
5
Start Page
290
Other Pages
301; discussion 301-2
Notes
LR: 20131121; JID: 101096515; 0 (Clearfil ST); 0 (Coffee); 0 (Composite Resins); 0 (Esthet-X); 0 (Filtek A110 composite resin); 0 (Oxidants); 0 (Tea); BBX060AN9V (Hydrogen Peroxide); CIN: J Esthet Restor Dent. 2008;20(3):206-11. PMID: 18533984; ppublish
Place of Publication
Canada
ISSN/ISBN
1496-4155; 1496-4155
Accession Number
PMID: 15726798
Language
eng
SubFile
Comparative Study; Journal Article; D
DOI
Output Language
Unknown(0)
PMID
15726798
Abstract
Discolored teeth can be treated with resin veneers, but their color changes when confronted with staining solutions. Polishing procedures can provide a remedy for highly stained composites, but they tend to remove some materials as well. However, bleaching procedures are an effective, nondestructive method for solving the problem. The aim of this study was to compare the color change of three veneer composites exposed to staining solutions and to evaluate the effectiveness of a 15% hydrogen peroxide bleaching agent and three polishing systems to remove the stain. Forty-five disks (12 x 2 mm) each of Clearfil ST (Kuraray Co. Ltd., Osaka, Japan), Esthet-X (Dentsply/Caulk, Milford DE, USA), and Filtek A110 (3M ESPE, St. Paul, MN, USA) were prepared. The specimens were polished with Sof-Lex (3M ESPE), Enhance (Dentsply/Caulk), or PoGo (Dentsply/Caulk). Five specimens for each material-polishing system combination were immersed in coffee (Nescafe Classic, Nestle SA, Vevey, Switzerland) or tea (Earl Grey, Lipton, Blackfriars-London, England) for 7 days. The remaining disks were stored in water. Color measurements were made with a spectrophotometer (X-Rite Seroice SP78, Loaner, Koln, Germany) at baseline; after 1, 3, 5, and 7 days; and after bleaching and repolishing. After 1 week, one side of the specimens was bleached with Illumine-office (Dentsply De Trey GmbH, Konstanz, Germany) for 1 hour, and the other side was repolished for 30 seconds. All comparisons of color change for the polishing systems, times, and staining solutions were subjected to repeated measurements of analysis of variance. Paired t-test was used to examine whether significant color differences (deltaE*) occurred during immersion at the specified time intervals (p < or = .05). Filtek A110 was the least stained resin composite. Its color remained under a deltaE* value of 2 during the study. Clearfil ST exhibited the most color change after 1 week. All specimens polished with Enhance showed less staining, whereas those polished with the Sof-Lex system demonstrated the most color change. Water did not cause a variance in the deltaE*. There was no difference in the staining potential of coffee and tea. Bleaching and repolishing were effective in removing the stains. The resin composites tested reversed nearly to baseline color with the bleaching and to less than values at 1 day of staining with repolishing. The coffee and tea brands tested stained the composites used in this study equally. In-office bleaching was found to be more effective than repolishing in the restitution of the color. CLINICAL SIGNIFICANCE: The results of this study suggest that the discoloration of resin veneers can be partially removed by in-office bleaching and repolishing procedures.
Descriptors
Coffee, Composite Resins, Dental Polishing, Dental Veneers, Hydrogen Peroxide, Oxidants, Tea, Tooth Bleaching, Tooth Discoloration
Links
Book Title
Database
Publisher
Data Source
Authors
Turkun,L. S., Turkun,M.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
The frequency of Barrett&#39;s esophagus in high-risk patients with chronic GERD 2005
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Gastrointestinal endoscopy
Periodical, Abbrev.
Gastrointest.Endosc.
Pub Date Free Form
Feb
Volume
61
Issue
2
Start Page
226
Other Pages
231
Notes
LR: 20061115; JID: 0010505; ppublish
Place of Publication
United States
ISSN/ISBN
0016-5107; 0016-5107
Accession Number
PMID: 15729230
Language
eng
SubFile
Comparative Study; Journal Article; IM
DOI
S0016510704025891 [pii]
Output Language
Unknown(0)
PMID
15729230
Abstract
BACKGROUND: The reported frequency of Barrett's esophagus (BE) in patients with reflux symptoms varies from 5% to 15%. The exact frequency of long-segment BE (LSBE) (>3 cm) and short-segment BE (SSBE) ( 50 years) who sought medical attention is 13.2%, with the majority (64%) having SSBE. These data suggest that the frequency of BE in patients with GERD has not changed. The true prevalence of BE in the general population, including those who do not seek care, is undoubtedly lower, currently and historically. The majority of patients with BE are overweight and have a hiatal hernia. Demographic data for patients with LSBE and SSBE are similar, indicating that these are a continuum of the same process.
Descriptors
Adult, Aged, Aged, 80 and over, Barrett Esophagus/epidemiology/etiology/pathology, Chronic Disease, Esophagoscopy, Female, Gastroesophageal Reflux/complications, Humans, Male, Middle Aged, Risk Factors
Links
Book Title
Database
Publisher
Data Source
Authors
Westhoff,B., Brotze,S., Weston,A., McElhinney,C., Cherian,R., Mayo,M. S., Smith,H. J., Sharma,P.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
Multi-route trihalomethane exposure in households using municipal tap water treated with chlorine or ozone-chlorine 2005 Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea. wkjo@knu.ac.kr
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
The Science of the total environment
Periodical, Abbrev.
Sci.Total Environ.
Pub Date Free Form
1-Mar
Volume
339
Issue
3-Jan
Start Page
143
Other Pages
152
Notes
LR: 20131121; JID: 0330500; 0 (Trihalomethanes); 124-48-1 (chlorodibromomethane); 4R7X1O2820 (Chlorine); 66H7ZZK23N (Ozone); 7LN464CH2O (bromodichloromethane); 7V31YC746X (Chloroform); 2004/03/22 [received]; 2004/07/22 [accepted]; ppublish
Place of Publication
Netherlands
ISSN/ISBN
0048-9697; 0048-9697
Accession Number
PMID: 15740765
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
S0048-9697(04)00573-X [pii]
Output Language
Unknown(0)
PMID
15740765
Abstract
In Korea, data for multi-route trihalomethane (THM) exposure in households using municipal tap water treated with ozone-chlorine or chlorine are unavailable or very limited. Accordingly, the present study was designed to obtain those data by measurements of the THM concentrations in the tap water and indoor and outdoor air in the two types of households, along with an estimation of THM exposure from water ingestion, showering, and the inhalation of indoor air. Chloroform was the most abundant THM in all three media, yet no bromoform was detected in any sample. Similar to previous findings, the winter chloroform concentration in tap water treated with chlorine (22.1 microg/l, median) was significantly higher than that in the tap water treated with ozone-chlorine (16.8 microg/l, median). However, the summer water chloroform concentrations and summer and winter water concentrations of the other two THMs (bromodichloromethane and dibromochloromethane) exhibited no significant difference between the chlorine and ozone-chlorine-treated water. It was suggested that the effects of the water parameters including biochemical oxygen demand of raw water entering water treatment plants should be considered when evaluating the advantage of ozone-chlorine disinfection for THM formation over chlorine disinfection. The indoor air THM concentration trend was also consistent with the water concentration trend. The indoor to outdoor air concentration ratios were comparable with previous studies. The THM exposure estimates from water ingestion, showering, and the inhalation of apartment indoor air when not in the shower suggested that, for residents living in the surveyed households, their exposure to THMs in the home was mostly associated with their household water uses. The THM exposure estimates from tap water ingestion were similar to those from showering.
Descriptors
Chlorine/chemistry, Chloroform/analysis, Cities, Disinfection, Environmental Exposure, Family Characteristics, Humans, Ozone/chemistry, Seasons, Trihalomethanes/analysis/toxicity, Water Purification/methods
Links
Book Title
Database
Publisher
Data Source
Authors
Jo,W. K., Kwon,K. D., Dong,J. I., Chung,Y.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
Changing conclusions on secondhand smoke in a sudden infant death syndrome review funded by the tobacco industry 2005 Division of General Internal Medicine Fellowship Program, Cardiovascular Research Institute, University of California, San Francisco, California 94143-1390, USA.
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Pediatrics
Periodical, Abbrev.
Pediatrics
Pub Date Free Form
Mar
Volume
115
Issue
3
Start Page
e356
Other Pages
66
Notes
LR: 20071115; GR: 1-T32-HP-19025/PHS HHS/United States; GR: CA-87472/CA/NCI NIH HHS/United States; JID: 0376422; 0 (Tobacco Smoke Pollution); OID: KIE: 128807; OID: NRCBL: VF 1.3.9; OTO: KIE; GN: KIE: 78 refs.; GN: KIE: KIE Bib: biomedical research; fraud
Place of Publication
United States
ISSN/ISBN
1098-4275; 0031-4005
Accession Number
PMID: 15741361
Language
eng
SubFile
Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S.; AIM; E; IM
DOI
115/3/e356 [pii]
Output Language
Unknown(0)
PMID
15741361
Abstract
BACKGROUND: Prenatal and postnatal exposure to tobacco smoke adversely affects maternal and child health. Secondhand smoke (SHS) has been linked causally with sudden infant death syndrome (SIDS) in major health reports. In 1992, the US Environmental Protection Agency (EPA) first noted an association between SHS and SIDS, and both prenatal exposure and postnatal SHS exposure were listed as independent risk factors for SIDS in a 1997 California EPA report (republished in 1999 by the National Cancer Institute) and a 2004 US Surgeon General report. The tobacco industry has used scientific consultants to attack the evidence that SHS causes disease, most often lung cancer. Little is known about the industry's strategies to contest the evidence on maternal and child health. In 2001, a review was published on SIDS that acknowledged funding from the Philip Morris (PM) tobacco company. Tobacco industry documents related to this review were examined to identify the company's influence on the content and conclusions of this review. METHODS: Tobacco industry documents include 40 million pages of internal memos and reports made available to the public as a result of litigation settlements against the tobacco industry in the United States. Between November 2003 and January 2004, we searched tobacco industry document Internet sites from the University of California Legacy Tobacco Documents Library and the Tobacco Documents Online website. Key terms included "SIDS" and names of key persons. Two authors conducted independent searches with similar key terms, reviewed the documents, and agreed on relevancy through consensus. Thirty documents were identified as relevant. Two drafts (an early version and a final version) of an industry-funded review article on SIDS were identified, and 2 authors independently compared these drafts with the final publication. Formal comments by PM executives made in response to the first draft were also reviewed. We used Science Citation Index in July 2004 to determine citation patterns for the referenced SIDS reviews. RESULTS: PM executives feared that SHS and maternal and child health issues would create a powerful and emotional impetus for smoke-free areas in the home, public areas, and the workplace. In response to the 1992 US EPA report on SHS, the Science and Technology Department of PM's Switzerland subsidiary, Fabriques de Tabac Reunies, searched for "independent" consultants to publish articles addressing SHS. The first industry-funded article was a literature review focusing on smoking and SIDS, conducted by consultant Peter Lee and co-author Allison Thornton, which stated that the association between parental smoking and SIDS could have been attributable to the failure to control fully for confounders. That first review has only been cited once, in the subsequent industry-funded review. In 1997, PM commissioned a consultant, Frank Sullivan, to write a review, with coauthor Susan Barlow, of all possible risk factors for SIDS. The first draft concluded that prenatal and postnatal smoking exposures are both independent risk factors for SIDS. After receiving comments and meeting with PM scientific executives, Sullivan changed his original conclusions on smoking and SIDS. The final draft was changed to emphasize the effects of prenatal maternal smoking and to conclude that postnatal SHS effects were "less well established." Changes in the draft to support this new conclusion included descriptions of Peter Lee's industry-funded review, a 1999 negative but underpowered study of SIDS risk and urinary cotinine levels, and criticisms of the conclusions of the National Cancer Institute report that SHS was causally associated with SIDS. In April 2001, the Sullivan review was published in the United Kingdom journal Paediatric and Perinatal Epidemiology, with a disclosure statement that acknowledged financial support from PM but did not acknowledge contributions from PM exe
Descriptors
Causality, Conflict of Interest, Humans, Infant, Research Support as Topic, Review Literature as Topic, Risk Factors, Scientific Misconduct, Sudden Infant Death/etiology, Tobacco Industry/economics/ethics/legislation & jurisprudence, Tobacco Smoke Pollution/adverse effects, Toxicology/ethics, United States, Biomedical and Behavioral Research, Empirical Approach
Links
Book Title
Database
Publisher
Data Source
Authors
Tong,E. K., England,L., Glantz,S. A.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
Physician and dentist tobacco use counseling and adolescent smoking behavior: results from the 2000 National Youth Tobacco Survey 2005 Sociomedical Sciences, Columbia University Mailman School of Public Health, 722 W 168th St, 11th Floor, New York, New York 10032, USA. drs26@columbia.edu.
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Pediatrics
Periodical, Abbrev.
Pediatrics
Pub Date Free Form
Mar
Volume
115
Issue
3
Start Page
719
Other Pages
725
Notes
LR: 20151119; JID: 0376422; ppublish
Place of Publication
United States
ISSN/ISBN
1098-4275; 0031-4005
Accession Number
PMID: 15741377
Language
eng
SubFile
Journal Article; AIM; IM
DOI
115/3/719 [pii]
Output Language
Unknown(0)
PMID
15741377
Abstract
OBJECTIVE: The present study describes patterns of tobacco use counseling among physicians and dentists as reported by adolescents and determines the association between provider advice to quit and cessation activities among current smokers. METHODS: Data were analyzed from the 2000 National Youth Tobacco Survey, an anonymous, self-administered, school-based survey. The National Youth Tobacco Survey was administered to a nationally representative sample of 35828 students in grades 6 to 12 in 324 schools. RESULTS: Thirty-three percent of adolescents who visited a physician or a dentist in the past year reported that a physician counseled them about the dangers of tobacco use, and 20% reported that a dentist provided a similar message. Among students who smoked in the past year, 16.4% received advice to quit from a physician and 11.6% received advice to quit from a dentist. Physician or dentist advice to quit was correlated with 1 or more quit attempts in the past 12 months. CONCLUSION: On the basis of adolescent reports, physician and dentist practice patterns remain well below recommended guidelines. Results suggest that provider advice to quit is associated with cessation activity. Additional studies are needed to confirm whether the low prevalence of brief provider tobacco use counseling is a missed opportunity to affect adolescent smoking behavior.
Descriptors
Adolescent, Child, Counseling/statistics & numerical data, Data Collection, Dentists, Female, Humans, Logistic Models, Male, Patient Education as Topic/statistics & numerical data, Physicians, Practice Patterns, Physicians'/statistics & numerical data, Smoking, Smoking Cessation, United States
Links
Book Title
Database
Publisher
Data Source
Authors
Shelley,D., Cantrell,J., Faulkner,D., Haviland,L., Healton,C., Messeri,P.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
Differences in ERK activation in squamous mucosa in patients who have gastroesophageal reflux disease with and without Barrett&#39;s esophagus 2005 Department of Medicine, Dallas VA Medical Center, University of Texas-Southwestern Medical School, Dallas, Texas, USA.
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
The American Journal of Gastroenterology
Periodical, Abbrev.
Am.J.Gastroenterol.
Pub Date Free Form
Mar
Volume
100
Issue
3
Start Page
551
Other Pages
559
Notes
LR: 20150923; GR: DK63621/DK/NIDDK NIH HHS/United States; GR: HL61897/HL/NHLBI NIH HHS/United States; GR: HL67256/HL/NHLBI NIH HHS/United States; GR: R01 DK063621/DK/NIDDK NIH HHS/United States; GR: R01 HL061897/HL/NHLBI NIH HHS/United States; GR: R01 HL0
Place of Publication
United States
ISSN/ISBN
0002-9270; 0002-9270
Accession Number
PMID: 15743351
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.; IM
DOI
AJG41122 [pii]
Output Language
Unknown(0)
PMID
15743351
Abstract
OBJECTIVES: In some patients with gastroesophageal reflux disease (GERD), the reflux-damaged esophageal squamous epithelium heals through the process of intestinal metaplasia (resulting in Barrett's esophagus) rather than through the regeneration of more squamous cells. We hypothesized that squamous epithelium in Barrett's esophagus might have abnormalities in activation of the extracellular-regulated kinases 1 and 2 (ERK1/2) signaling pathway that may facilitate esophageal repair through metaplasia in response to acid-induced injury. METHODS: Endoscopic biopsies were taken from distal esophageal squamous mucosa in patients who had GERD with and without Barrett's esophagus and in controls, before and after esophageal perfusion with 0.1 N HCl acid. Basal ERK1/2 phosphorylation, acid-induced ERK1/2 activity and phosphorylation, and localization of phosphorylated ERK1/2 were determined using immunoblotting, Western blotting, and immunohistochemistry. RESULTS: Compared to patients with Barrett's esophagus, patients with GERD exhibited significantly lower baseline levels of phosphorylated ERK1/2 expression (35 +/- 4%vs 90 +/- 21% control, p= 0.01) Acid exposure significantly increased ERK1/2 activity (346.6 +/- 51.90 to 446.8 +/- 62.44 RIU, p= 0.02) and phosphorylation (3.55 +/- 1.26 to 4.49 +/- 1.25 [ratio phospho/total ERK], p= 0.01) in the squamous mucosa of GERD patients, but not in those with Barrett's esophagus or in controls. CONCLUSIONS: Between patients with Barrett's esophagus and patients with uncomplicated GERD, there are significant differences in baseline levels and in acid-induced activation of ERK1/2 in esophageal squamous epithelium. To our knowledge, this is the first description of a molecular, phenotypic feature that distinguishes the esophageal squamous mucosa of GERD patients with and without Barrett's esophagus.
Descriptors
Adult, Aged, Barrett Esophagus/complications/enzymology, Biopsy, Blotting, Western, Enzyme Activation, Female, Gastroesophageal Reflux/enzymology, Humans, Immunoblotting, Immunohistochemistry, Male, Metaplasia, Middle Aged, Mitogen-Activated Protein Kinase 1/metabolism, Mitogen-Activated Protein Kinase 3/metabolism, Mucous Membrane/enzymology, Phosphorylation, Signal Transduction/physiology, Tissue Distribution
Links
Book Title
Database
Publisher
Data Source
Authors
Souza,R. F., Shewmake,K. L., Shen,Y., Ramirez,R. D., Bullock,J. S., Hladik,C. L., Lee,E. L., Terada,L. S., Spechler,S. J.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
Isotopic evidence for age-related variation in diet from Isola Sacra, Italy 2005 Department of Anthropology, McMaster University, Hamilton, Ontario L8S 4L9, Canada. prowset@mcmaster.ca
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
American Journal of Physical Anthropology
Periodical, Abbrev.
Am.J.Phys.Anthropol.
Pub Date Free Form
Sep
Volume
128
Issue
1
Start Page
2
Other Pages
13
Notes
LR: 20061115; CI: (c) 2005; JID: 0400654; 0 (Apatites); 0 (Carbon Isotopes); 0 (Nitrogen Isotopes); 9007-34-5 (Collagen); ppublish
Place of Publication
United States
ISSN/ISBN
0002-9483; 0002-9483
Accession Number
PMID: 15761807
Language
eng
SubFile
Historical Article; Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
10.1002/ajpa.20094 [doi]
Output Language
Unknown(0)
PMID
15761807
Abstract
This study examines collagen (N=105) and apatite (N=65) data from an Imperial Roman skeletal sample from the necropolis of Isola Sacra (Rome, Italy). This paper explores correlations between the isotopic composition of bone samples and the inferred age and sex of these individuals (aged 5--45+ years). The collagen of males, and older individuals in general, was significantly enriched in (15)N but not (13)C. Bone carbonate was somewhat depleted in (13)C in some older individuals, suggesting increased consumption of olive oil and possibly wine. Subadults (>5 years) in the sample appear to have consumed an almost exclusively terrestrial diet. This study demonstrates a clear trend in dietary patterns between adult age groups, as well as between adults and children within a population.
Descriptors
Adolescent, Adult, Age Factors, Anthropology, Physical/methods, Apatites/analysis, Bone and Bones/chemistry, Carbon Isotopes/analysis, Child, Child, Preschool, Collagen/analysis, Diet/history, Female, Femur/chemistry, History, Ancient, Humans, Italy, Male, Middle Aged, Nitrogen Isotopes/analysis, Sex Factors
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Wiley-Liss, Inc
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Prowse,T. L., Schwarcz,H. P., Saunders,S. R., Macchiarelli,R., Bondioli,L.
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