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Mulvee M, Vasiljevic N, Mann S, Patil AJ. Stimuli-Responsive Nucleotide-Amino Acid Hybrid Supramolecular Hydrogels. Gels 2021; 7:gels7030146. [PMID: 34563032 PMCID: PMC8482081 DOI: 10.3390/gels7030146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 08/27/2021] [Accepted: 09/06/2021] [Indexed: 12/23/2022] Open
Abstract
The ability to assemble chemically different gelator molecules into complex supramolecular hydrogels provides excellent opportunities to construct functional soft materials. Herein, we demonstrate the formation of hybrid nucleotide–amino acid supramolecular hydrogels. These are generated by the silver ion (Ag+)-triggered formation of silver–guanosine monophosphate (GMP) dimers, which undergo self-assembly through non-covalent interactions to produce nanofilaments. This process results in a concomitant pH reduction due to the abstraction of a proton from the guanine residue, which triggers the in situ gelation of a pH-sensitive amino acid, N-fluorenylmethyloxycarbonyl tyrosine (FY), to form nucleotide–amino acid hybrid hydrogels. Alterations in the supramolecular structures due to changes in the assembly process are observed, with the molar ratio of Ag:GMP:FY affecting the assembly kinetics, and the resulting supramolecular organisation and mechanical properties of the hydrogels. Higher Ag:GMP stoichiometries result in almost instantaneous gelation with non-orthogonal assembly of the gelators, while at lower molar ratios, orthogonal assembly is observed. Significantly, by increasing the pH as an external stimulus, nanofilaments comprising FY can be selectively disassembled from the hybrid hydrogels. Our results demonstrate a simple approach for the construction of multicomponent stimuli-responsive supramolecular hydrogels with adaptable network and mechanical properties.
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Affiliation(s)
- Matthew Mulvee
- Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK;
- Bristol Centre for Functional Nanomaterials, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK;
| | - Natasa Vasiljevic
- Bristol Centre for Functional Nanomaterials, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK;
- School of Physics, University of Bristol, Bristol BS8 1TS, UK
| | - Stephen Mann
- Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK;
- Bristol Centre for Functional Nanomaterials, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK;
- Correspondence: (S.M.); (A.J.P.)
| | - Avinash J. Patil
- Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK;
- Correspondence: (S.M.); (A.J.P.)
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Mulvee M, Vasiljevic N, Mann S, Patil AJ. Construction of supramolecular hydrogels using photo-generated nitric oxide radicals. Soft Matter 2018; 14:5950-5954. [PMID: 30010173 DOI: 10.1039/c8sm00651b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photo-generated nitric oxide radicals (NO˙) derived from sodium nitroprusside dihydrate (SNP) are employed for the construction of supramolecular hydrogels based on an amino acid derivative precursor, N-fluorenylmethyloxycarbonyl tyrosine phosphate (FYP), which through dephosphorylation produces the gelator, N-fluorenylmethyloxycarbonyl tyrosine (FY). Self-assembly of the amphiphilic gelator yields high-aspect ratio nanofilaments that entangle to form self-supporting, viscoelastic hydrogels. The presence of photolyzed SNP yields periodically twisted nanofilaments with opposite chirality to filaments formed through conventional hydrogelation routes.
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Affiliation(s)
- Matthew Mulvee
- Centre for Organized Matter Chemistry and Centre for Protocell Research, School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.
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Mao X, Luo F, Boyd LK, Zhou B, Zhang Y, Stankiewicz E, Marzec J, Vasiljevic N, Yu Y, Feng N, Xu J, Lorincz A, Jiang Y, Chelala C, Ren G, Berney DM, Zhao SC, Lu YJ. NKAIN2 functions as a novel tumor suppressor in prostate cancer. Oncotarget 2018; 7:63793-63803. [PMID: 27588475 PMCID: PMC5325404 DOI: 10.18632/oncotarget.11690] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 08/22/2016] [Indexed: 11/25/2022] Open
Abstract
Recurrent chromosome breakpoints at 6q22.31, leading to truncation and potential loss-of-function of the NKAIN2 gene, in Chinese prostate cancer patients were previously identified. In this study we investigated genomic, methylation and expression changes of NKAIN2 in a large number of prostate cancer samples and determined its functional role in prostate cancer cells. Fluorescence in situ hybridization analysis confirmed that NKAIN2 truncation is specific to Chinese while deletion of the gene is frequent in both Chinese and UK prostate cancers. Significantly reduced expression of NKAIN2 was also detected at both RNA and protein levels. Somatic mutations of NKAIN2 in prostate cancer samples exist but at very low frequency, suggesting that it is a putative tumor suppressor gene (TSG) with haploid insufficiency. Our functional studies showed that overexpression of NKAIN2 in prostate cancer cells inhibits cellular growth by promoting cell apoptosis, and decreasing cell migration and invasion. Conversely, knockdown of NKAIN2 promotes prostate cancer cell growth by inhibiting cell apoptosis, and increasing cell migration and invasion. These data imply that NKAIN2 is a novel TSG whose activity is commonly reduced in prostate cancer. It may restrain the disease development and progression by inducing apoptosis and suppressing cancer cell growth, migration and invasion. This study provides new insights into prostate carcinogenesis and opportunities for development of novel therapies for prostate cancer.
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Affiliation(s)
- Xueying Mao
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Fei Luo
- Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.,Key Laboratory of Proteomics of Guangdong Province and Key Laboratory of Transcriptomics and Proteomics of Human Diseases Supported by The Ministry of Education of China, Southern Medical University, Guangzhou, 510515, China
| | - Lara K Boyd
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Bowei Zhou
- Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.,Key Laboratory of Proteomics of Guangdong Province and Key Laboratory of Transcriptomics and Proteomics of Human Diseases Supported by The Ministry of Education of China, Southern Medical University, Guangzhou, 510515, China
| | - Yanling Zhang
- Department of Pathology, The First Affiliated Hospital, Zhejiang University Medical College, Hangzhou, 310009, China.,Department of Gynecology and Obstetrics, Sir Run Run Shaw Hospital, Zhejiang University Medical College, Hangzhou, 310009, China
| | - Elzbieta Stankiewicz
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Jacek Marzec
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Natasa Vasiljevic
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Yongwei Yu
- Department of Pathology, Changhai Hospital, The Second Military Medical University, Shanghai, 200433, China
| | - Ninghan Feng
- Department of Urology, Wuxi Second People's Hospital, Nanjing Medical University, Wuxi, 214002, China
| | - Jia Xu
- Key Laboratory of Proteomics of Guangdong Province and Key Laboratory of Transcriptomics and Proteomics of Human Diseases Supported by The Ministry of Education of China, Southern Medical University, Guangzhou, 510515, China
| | - Attila Lorincz
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Yong Jiang
- Key Laboratory of Proteomics of Guangdong Province and Key Laboratory of Transcriptomics and Proteomics of Human Diseases Supported by The Ministry of Education of China, Southern Medical University, Guangzhou, 510515, China
| | - Claude Chelala
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Guoping Ren
- Department of Pathology, The First Affiliated Hospital, Zhejiang University Medical College, Hangzhou, 310009, China
| | - Daniel M Berney
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
| | - Shan-Chao Zhao
- Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Yong-Jie Lu
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, EC1M 6BQ, UK
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Lorincz AT, Nathan M, Reuter C, Warman R, Thaha MA, Sheaff M, Vasiljevic N, Ahmad A, Cuzick J, Sasieni P. Methylation of HPV and a tumor suppressor gene reveals anal cancer and precursor lesions. Oncotarget 2017; 8:50510-50520. [PMID: 28881579 PMCID: PMC5584159 DOI: 10.18632/oncotarget.17984] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 05/06/2017] [Indexed: 12/24/2022] Open
Abstract
We studied DNA methylation patterns of human papillomavirus (HPV) and tumor suppressor gene EPB41L3 in 148 anal and perianal biopsies to determine whether high levels of methylation would be associated with anal intraepithelial neoplasia (AIN). The most prevalent HPV type was HPV16, detected in 54% of the 30 benign biopsies, 33% of the 43 low-grade AIN (lgAIN), 82% of the 59 high grade AIN (hgAIN) and 4 of the 5 anal cancers. A methylation score was developed (0.561*HPV16me+0.439*EPB41L3) which had increasing values with severity of disease: the mean was 8.1% in benign, 13.2% in lgAIN, 22.3% in hgAIN and 49.3% in cancers (p < 0.0001). The methylation score as a triage classifier at a cut-off of 8.8 gave a sensitivity of 90.6% (95% CI: 82.8, 96.9), specificity of 50.7% (95% CI: 39.7, 61.6) and area under the curve of 0.82 (95% CI: 0.75-0.89) for separating hgAIN and cancer from benign and lgAIN biopsies. We conclude that methylation of HPV16 and EPB41L3 show highly significant association with increasing severity of AIN and cancer and may be useful as biomarkers in anal disease.
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Affiliation(s)
- Attila T. Lorincz
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Queen Mary University of London, EC1M 6BQ, UK
| | - Mayura Nathan
- Homerton Anal Neoplasia Service, Homerton University Hospital NHS Foundation Trust, London E9 6SR, UK
| | - Caroline Reuter
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Queen Mary University of London, EC1M 6BQ, UK
| | - Rhian Warman
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Queen Mary University of London, EC1M 6BQ, UK
| | - Mohamed A. Thaha
- National Bowel Research Centre, Blizard Institute, Queen Mary University of London, London E1 2AT, UK
- Barts Anal Neoplasia Centre, Department of Colorectal Surgery, Surgery and Cancer CAG, The Royal London Hospital, Barts Health NHS Trust, Whitechapel, London E1 1BB, UK
| | - Michael Sheaff
- Cellular Pathology, Barts Health NHS Trust, London E1 2ES, UK
| | - Natasa Vasiljevic
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Queen Mary University of London, EC1M 6BQ, UK
| | - Amar Ahmad
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Queen Mary University of London, EC1M 6BQ, UK
| | - Jack Cuzick
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Queen Mary University of London, EC1M 6BQ, UK
| | - Peter Sasieni
- Centre for Cancer Prevention, Wolfson Institute of Preventive Medicine, Queen Mary University of London, EC1M 6BQ, UK
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Mann J, Angelou N, Arnqvist J, Callies D, Cantero E, Arroyo RC, Courtney M, Cuxart J, Dellwik E, Gottschall J, Ivanell S, Kühn P, Lea G, Matos JC, Palma JMLM, Pauscher L, Peña A, Rodrigo JS, Söderberg S, Vasiljevic N, Rodrigues CV. Complex terrain experiments in the New European Wind Atlas. Philos Trans A Math Phys Eng Sci 2017; 375:rsta.2016.0101. [PMID: 28265025 PMCID: PMC5346220 DOI: 10.1098/rsta.2016.0101] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/23/2016] [Indexed: 05/31/2023]
Abstract
The New European Wind Atlas project will create a freely accessible wind atlas covering Europe and Turkey, develop the model chain to create the atlas and perform a series of experiments on flow in many different kinds of complex terrain to validate the models. This paper describes the experiments of which some are nearly completed while others are in the planning stage. All experiments focus on the flow properties that are relevant for wind turbines, so the main focus is the mean flow and the turbulence at heights between 40 and 300 m. Also extreme winds, wind shear and veer, and diurnal and seasonal variations of the wind are of interest. Common to all the experiments is the use of Doppler lidar systems to supplement and in some cases replace completely meteorological towers. Many of the lidars will be equipped with scan heads that will allow for arbitrary scan patterns by several synchronized systems. Two pilot experiments, one in Portugal and one in Germany, show the value of using multiple synchronized, scanning lidar, both in terms of the accuracy of the measurements and the atmospheric physical processes that can be studied. The experimental data will be used for validation of atmospheric flow models and will by the end of the project be freely available.This article is part of the themed issue 'Wind energy in complex terrains'.
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Affiliation(s)
- J Mann
- Technical University of Denmark, Roskilde, Denmark
| | - N Angelou
- Technical University of Denmark, Roskilde, Denmark
| | | | - D Callies
- Fraunhofer Institute for Wind Energy and Energy System Technology IWES, Germany
| | - E Cantero
- National Renewable Energy Centre (CENER), Sarriguren, Spain
| | | | - M Courtney
- Technical University of Denmark, Roskilde, Denmark
| | - J Cuxart
- Universitat de les Illes Balears, Mallorca, Spain
| | - E Dellwik
- Technical University of Denmark, Roskilde, Denmark
| | - J Gottschall
- Fraunhofer Institute for Wind Energy and Energy System Technology IWES, Germany
| | | | - P Kühn
- Fraunhofer Institute for Wind Energy and Energy System Technology IWES, Germany
| | - G Lea
- Technical University of Denmark, Roskilde, Denmark
| | - J C Matos
- Instituto de Ciência e Inovação em Engenharia Mecânica e Gestão Industrial (INEGI), Porto, Portugal
| | - J M L M Palma
- Faculdade de Engenharia da Universidade do Porto (FEUP), Porto, Portugal
| | - L Pauscher
- Fraunhofer Institute for Wind Energy and Energy System Technology IWES, Germany
| | - A Peña
- Technical University of Denmark, Roskilde, Denmark
| | - J Sanz Rodrigo
- National Renewable Energy Centre (CENER), Sarriguren, Spain
| | | | - N Vasiljevic
- Technical University of Denmark, Roskilde, Denmark
| | - C Veiga Rodrigues
- Faculdade de Engenharia da Universidade do Porto (FEUP), Porto, Portugal
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Hansen KS, Larsen GC, Menke R, Vasiljevic N, Angelou N, Feng J, Zhu WJ, Vignaroli A, Liu W W, Xu C, Shen WZ. Wind turbine wake measurement in complex terrain. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/753/3/032013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Vasilic-Brasnjevic S, Marinkovic J, Vlajinac H, Vasiljevic N, Jakovljevic B, Nikic M, Maksimovic M. Association of body mass index and waist circumference with severity of knee osteoarthritis. Acta Reumatol Port 2016; 41:226-231. [PMID: 27682419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
AIM The aim of the present study was to investigate the association of the body mass index (BMI) and waist circumference (WC) with the severity of radiographic severity of knee osteoarthritis (rKOA) Methods. A cross-sectional study had been applied during the research which included 150 patients diagnosed at the General Hospital in Užice and Health Center in Arilje (Serbia). The study included patients over the age of 50 diagnosed with OA according to The European League Against Rheumatism (EULAR) criteria. Data on social-demographic characteristics, health habits, and personal and family histories of the participants were collected through a specific questionnaire designated for this research. The severity of the disease was assessed pursuant to radiological changes using the Кellgren-Lawrence grading scale (K-L). The state of nourishment was assessed according to the BMI and WC. RESULTS According to multivariate logistic regression analyses, after adjustment on age, sex, marital status, formal education, present occupation, smoking, alcohol consumption and physical activity, higher grades of rKOA (grade III and grade IV) were significantly related to BMI (p = 0.038) and WC (p < 0.001). The association was much stronger for obesity defined as BMI ≥30 kg/m2 (p = 0.002) and for abdominal obesity - WC > 102 cm in men and > 88 cm in women (p = 0.009). CONCLUSION This study showed that obesity defined as BMI ≥30 kg/m2 and abdominal obesity are strongly related to K-L of rKOA, the associations being of very similar extent.
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Mercer MP, Plana D, Fermίn DJ, Morgan D, Vasiljevic N. Growth of epitaxial Pt1-xPbx alloys by surface limited redox replacement and study of their adsorption properties. Langmuir 2015; 31:10904-10912. [PMID: 26372676 DOI: 10.1021/acs.langmuir.5b02351] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The surface limited redox replacement (SLRR) method has been used to design two-dimensional Pt-Pb nanoalloys with controlled thickness, composition, and structure. The electrochemical behavior of these alloys has been systematically studied as a function of alloy composition. A single-cell, two-step SLRR protocol based on the galvanic replacement of underpotentially deposited monolayers of Pb with Pt was used to grow epitaxial Pt1-xPbx (x < 0.1) alloys of up to 10 ML thickness on Au substrates. It is shown that by varying the terminating potential of the galvanic replacement step, the Pb atomic content can be controlled in the films. Electrochemical analysis of the alloys showed that the adsorption of both H and CO exhibits similar, and systematic, decreases with small increases in the Pb content. These measurements, commonly used in electrocatalysis for the determination of active surface areas of Pt, suggested area values much lower than those expected based on the net Pt composition in the alloy as measured by XPS. These results show that Pb has a strong screening effect on the adsorption of both H and CO. Moreover, changes in alloy composition result in a negative shift in the potential of the peaks of CO oxidation that scales with the increase of Pb content. The results suggest electronic and bifunctional effects of incorporated Pb on the electrochemical behavior of Pt. The study illustrates the potential of the SLRR methodology, which could be employed in the design of 2-dimensional bimetallic Pt nanoalloys for fundamental studies of electrocatalytic behavior in fuel cell reactions dependent on the nature of alloying metal and its composition.
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Affiliation(s)
- M P Mercer
- Bristol Centre for Functional Nanomaterials, University of Bristol , Bristol BS8 1FD, U.K
- School of Physics, H.H. Wills Physics Laboratory, University of Bristol , Bristol BS8 1TL, U.K
| | - D Plana
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - D J Fermίn
- Bristol Centre for Functional Nanomaterials, University of Bristol , Bristol BS8 1FD, U.K
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - D Morgan
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University , Cardiff CF10 3AT, U.K
| | - N Vasiljevic
- Bristol Centre for Functional Nanomaterials, University of Bristol , Bristol BS8 1FD, U.K
- School of Physics, H.H. Wills Physics Laboratory, University of Bristol , Bristol BS8 1TL, U.K
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Brentnall AR, Vasiljevic N, Scibior-Bentkowska D, Cadman L, Austin J, Cuzick J, Lorincz AT. HPV33 DNA methylation measurement improves cervical pre-cancer risk estimation of an HPV16, HPV18, HPV31 and \textit{EPB41L3} methylation classifier. Cancer Biomark 2015; 15:669-75. [PMID: 26406956 DOI: 10.3233/cbm-150507] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Persistent infection %by with high risk human papillomavirus (hrHPV) types causes cervical cancer but most women who test positive are at very low risk of neoplasia. Strategies are needed which can retain high sensitivity of hrHPV testing but reduce the number of false-positives. We showed previously that a combination DNA methylation triage assay for HPV types 16, 18 and 31 and human gene EPB41L3 was useful to identify high grade cervical lesions. OBJECTIVE Assess whether measurement of DNA methylation in HPV type 33 can improve the previous classifier. METHODS A London colposcopy referral group of 1493 women of whom 556 (37%) had histologically-confirmed CIN (cervical intraepithelial neoplasia) 2 or 3 that included 114 HPV33 positive women with methylation measured for three L2 CpGs 5557, 5560 and 5566. Discrimination performance was assessed for the new classifier S5, built by adding HPV33 to the earlier classifier. RESULTS HPV33 methylation measurement improved prediction among HPV33 positive women. Receiver operating characteristic analyses showed an area under the curve (AUC) for HPV33 methylation of 0.68 (95% CI 0.57-0.78). The earlier risk score was significantly improved by HPV33 methytlation (AUC = 0.82 vs 0.80; P < 0.001). For 90% sensitivity the specificity for CIN2/3 was 49% (95% CI 46-52%). CONCLUSIONS Measurement of HPV33 DNA methylation contributes independent diagnostic information to EPB41L3 and HPV16, HPV18 and HPV31, and is superior to genotyping. Other HPV and human methylation target regions might be useful to further improve S5.
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Nutariya J, Fayette M, Dimitrov N, Vasiljevic N. Growth of Pt by surface limited redox replacement of underpotentially deposited hydrogen. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.01.052] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Affiliation(s)
- M. Fayette
- Department of Chemistry, SUNY at Binghamton, Binghamton, New York 13902, United
States
| | - J. Nutariya
- School of Physics,
H.H. Wills
Physics Laboratory, University of Bristol, Bristol BS8 1TL, U.K
| | - N. Vasiljevic
- School of Physics,
H.H. Wills
Physics Laboratory, University of Bristol, Bristol BS8 1TL, U.K
| | - N. Dimitrov
- Department of Chemistry, SUNY at Binghamton, Binghamton, New York 13902, United
States
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Byg LM, Vidlund J, Vasiljevic N, Clausen D, Forslund O, Norrild B. NF-κB signalling is attenuated by the E7 protein from cutaneous human papillomaviruses. Virus Res 2012; 169:48-53. [DOI: 10.1016/j.virusres.2012.06.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Revised: 06/29/2012] [Accepted: 06/29/2012] [Indexed: 12/18/2022]
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Mirabello L, Schiffman M, Ghosh A, Rodriguez AC, Vasiljevic N, Wentzensen N, Herrero R, Hildesheim A, Wacholder S, Scibior-Bentkowska D, Burk RD, Lorincz AT. Elevated methylation of HPV16 DNA is associated with the development of high grade cervical intraepithelial neoplasia. Int J Cancer 2012; 132:1412-22. [PMID: 22847263 DOI: 10.1002/ijc.27750] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Accepted: 06/26/2012] [Indexed: 01/04/2023]
Abstract
We explored the association of human papillomavirus type 16 (HPV16) DNA methylation with age, viral load, viral persistence and risk of incident and prevalent high grade CIN (CIN2+) in serially collected specimens from the Guanacaste, Costa Rica cohort. 273 exfoliated cervical cell specimens (diagnostic and pre-diagnostic) were selected: (1) 92 with HPV16 DNA clearance (controls), (2) 72 with HPV16 DNA persistence (without CIN2+) and (3) 109 with CIN2+. DNA was extracted, bisulfite converted and methylation was quantified using pyrosequencing assays at 66 CpGs across the HPV genome. The Kruskal-Wallis test was used to determine significant differences among groups, and receiver operating characteristic curve analyses were used to evaluate how well methylation identified women with CIN2+. In diagnostic specimens, 88% of CpG sites had significantly higher methylation levels in CIN2+ after correction for multiple tests compared with controls. The highest area under the ROC curve (AUC) was 0.82 for CpG site 6457 in L1, and a diagnostic sensitivity of 91% corresponded to a specificity of 60% for CIN2+. Prospectively, 17% of CpG sites had significantly higher methylation in pre-diagnostic CIN2+ specimens (median time of 3 years before diagnosis) versus controls. The strongest pre-diagnostic CpG site was 6367 in L1 with an AUC of 0.76. Age-stratified analyses suggested that women older than the median age of 28 years have an increased risk of precancer associated with high methylation. Higher methylation in CIN2+ cases was not explained by higher viral load. We conclude that elevated levels of HPV16 DNA methylation may be useful to predict concurrently diagnosed as well as future CIN2+.
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Affiliation(s)
- Lisa Mirabello
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA.
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Fayette M, Liu Y, Bertrand D, Nutariya J, Vasiljevic N, Dimitrov N. From Au to Pt via surface limited redox replacement of Pb UPD in one-cell configuration. Langmuir 2011; 27:5650-8. [PMID: 21476555 DOI: 10.1021/la200348s] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
This work is aimed at developing a protocol based on surface limited redox replacement (SLRR) of underpotentially deposited (UPD) Pb layers for the growth of epitaxial and continuous Pt thin films on polycrystalline and single crystalline Au surfaces. Different from previously reported papers using SLRR in multiple immersion or flow cell setups, this work explores the one-cell configuration setup as an alternative to improve the efficiency and quality of the growth. Open circuit chronopotentiometry and quartz-crystal microbalance experiments demonstrate steady displacement kinetics and a yield that is higher than the stoichiometric Pt(II)-Pb exchange ratio (1:1). This high yield is attributed to oxidative adsorption of OH(ad) taking place on Pt along with the displacement process. Also, ex situ scanning tunneling microscopy surface characterization reveals after the first replacement event the formation of a dense Pt cluster network that homogenously covers the Au surface. The Pt films grow homogenously with no significant changes in the cluster distribution and surface roughness observed up to 10 successive replacement events. X-ray diffraction analysis shows distinct (111) crystallographic orientation of thicker Pt films deposited on (111) textured Au thin films. Coarse energy dispersive spectroscopy measurements and finer X-ray photoelectron spectroscopy suggest at least 4 atom % Pb incorporating into the Pt layer compared to 13 atom % alloyed Cu when the growth is carried out by SLRR of Cu UPD.
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Affiliation(s)
- M Fayette
- Department of Chemistry, SUNY at Binghamton, Binghamton, New York 13902, United States
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Vasiljevic N, Viyannalage LT, Dimitrov N, Sieradzki K. High resolution electrochemical STM: New structural results for underpotentially deposited Cu on Au(111) in acid sulfate solution. J Electroanal Chem (Lausanne) 2008. [DOI: 10.1016/j.jelechem.2007.10.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Vasiljevic M, Stanimirovic B, Stanojevic D, Djukic M, Vasiljevic N. Primary double invasive cervical carcinoma, squamous cell carcinoma and adenocarcinoma--case report. EUR J GYNAECOL ONCOL 2008; 29:411-413. [PMID: 18714584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A case of 56-year old women with double primary invasive cervical carcinoma, squamous cell carcinoma and endometrioid adenocarcinoma is presented. The patient was subjected to radical abdominal hysterectomy with pelvic and paraaortic lymphadenectomy. Surgery was followed by radiotherapy. Since the treatment the patient has been doing well and is free of any signs of relapse of the disease.
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Affiliation(s)
- M Vasiljevic
- University Clinic of Gynaecology and Obstetrics Narodni Front, Belgrade, Serbia.
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Vasiljevic M, Prorocic M, Vasiljevic N, Tasic L. Endometrial carcinoma with ovarian metastases incidentally detected in a 30-year-old infertile patient--case report. EUR J GYNAECOL ONCOL 2007; 28:137-8. [PMID: 17479678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This is a case of invasive endometrial carcinoma with ovarian metastases incidentally detected in a 30-year-old infertile woman. The patient was asymptomatic. Carcinoma was discovered during hysteroscopy. She was submitted to surgical treatment involving total hysterectomy, bilateral salpingo-oophorectomy and dissection of the pelvic and paraaortal lymph nodes. Postoperative irradiation therapy was performed. Since treatment the patient has been well.
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Affiliation(s)
- M Vasiljevic
- University Clinic of Gynaecology and Obstetrics Narodni Front, Belgrade, Serbia
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Abstract
Self-assembly of surface phase domains is a promising route to fabricate stable nanometer-scale structures. This Letter reports a novel labyrinth structure of orthogonal nanoscale ribbons of Cu4Pb3 ordered-alloy on Cu(100) formed by electrochemical deposition. The labyrinth develops as loops of Cu4Pb3 ribbons elongate as closely spaced paired stripes. The structure is explained in terms of elastic interactions between anisotropic surface stress domains, wherein stripes of different phase variants form attractive dipoles. An energetic analysis determines the physical conditions necessary for the structure to form.
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Affiliation(s)
- R V Kukta
- Department of Mechanical Engineering, State University of New York, Stony Brook, New York 11794-2300, USA
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Trimble T, Tang L, Vasiljevic N, Dimitrov N, van Schilfgaarde M, Friesen C, Thompson CV, Seel SC, Floro JA, Sieradzki K. Anion adsorption induced reversal of coherency strain. Phys Rev Lett 2005; 95:166106. [PMID: 16241822 DOI: 10.1103/physrevlett.95.166106] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2005] [Indexed: 05/05/2023]
Abstract
Experimental results are presented for stress evolution, in vacuum and electrolyte, for the first monolayer of Cu on Au(111). In electrolyte the monolayer is pseudomorphic and the stress-thickness change is -0.60 N/m, while conventional epitaxy theory predicts a value of +7.76 N/m. In vacuum, the monolayer is incoherent with the underlying gold. Using a combination of first-principles based calculations and molecular dynamic simulations we analyzed these results and demonstrate that in electrolyte, overlayer coherency is maintained owing to anion adsorption.
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Affiliation(s)
- T Trimble
- Ira A. Fulton School of Engineering, Arizona State University, Tempe, 85287-6106, USA
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Abstract
We present the first set of results measuring the change in interfacial free energy and surface stress for Au(111) electrodes in an electrolyte containing a nonspecifically adsorbing anion and compare this behavior to that in an electrolyte containing an anion known to undergo specific adsorption. Generally, we find that the surface stress is more sensitive to changes in electrode potential and adsorption then the interfacial free energy. The results obtained in fluoride electrolytes are compared to the predictions of a thermodynamic analysis.
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Affiliation(s)
- N Vasiljevic
- Ira A. Fulton School of Engineering, Arizona State University, Tempe, Arizona 85287-6106, USA
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Tepsic V, Ristic V, Ristic D, Vasiljevic N, Pecelj-Gec M. Heart phospholipid content and fatty acid composition in the rat after feeding different lipid supplemented diets. Physiol Res 1999; 47:413-8. [PMID: 10453748 DOI: pmid/10453748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The heart phospholipid content and fatty acid composition were examined in adult rats after four weeks of feeding lipid-supplemented diets (20 g % w/w) containing sunflower oil-lard (1:1) mixture (SL group) or margarine (M group). Our results showed a decreased cardiolipin content and distribution in both experimental groups and an increased lysophosphatidylcholine and phosphatidylcholine content and distribution in the SL group with a tendency to lower phosphatidylcholine/phospatidylethanolamine ratio in both experimental groups. In the SL group, the content of saturated fatty acids was higher and that of monounsaturated fatty acids was lower than in the control group. The M group showed inverse results. The content of saturated fatty acids was lower and that of monounsaturated was higher than in the control group. Polyunsaturated n-6 fatty acids were decreased in both experimental groups and n-3 fatty acids were increased in the M group. Feeding lipid-supplemented diets reduced n-6/n-3 and 20:4/22:6 ratios in the M group. The polyunsaturated/saturated fatty acid ratio was lower in the SL and higher in indicating the M group than in the control group. Our results are in agreement with the other reports indicating that the heart is sensitive to diet-induced lipid alterations.
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Affiliation(s)
- V Tepsic
- Institute for Medical Research, Belgrade, Yugoslavia
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