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Abstract
Many teenagers go to bed and wake up significantly later than younger children, a developmental progression thought to reflect adolescent psychosocial processes. To determine whether biological processes may underlie a delay of phase preference in adolescents, 183 sixth-grade boys and 275 sixth-grade girls completed questionnaires for morningness/eveningness (M/E) and pubertal status. School environment and birth order were also evaluated. A significant relationship of pubertal status to M/E was found in girls, with a similar though nonsignificant trend in boys. No relationship between M/E and psychosocial factors was found. These data support involvement of a biological factor in the adolescent phase preference delay and indicate that our current understanding of adolescent sleep patterns may need revision.
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32 |
718 |
2
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Vieira C, Pasyukova EG, Zeng ZB, Hackett JB, Lyman RF, Mackay TF. Genotype-environment interaction for quantitative trait loci affecting life span in Drosophila melanogaster. Genetics 2000; 154:213-27. [PMID: 10628982 PMCID: PMC1460900 DOI: 10.1093/genetics/154.1.213] [Citation(s) in RCA: 240] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The nature of genetic variation for Drosophila longevity in a population of recombinant inbred lines was investigated by estimating quantitative genetic parameters and mapping quantitative trait loci (QTL) for adult life span in five environments: standard culture conditions, high and low temperature, and heat-shock and starvation stress. There was highly significant genetic variation for life span within each sex and environment. In the analysis of variance of life span pooled over sexes and environments, however, the significant genetic variation appeared in the genotype x sex and genotype x environment interaction terms. The genetic correlation of longevity across the sexes and environments was not significantly different from zero in these lines. We estimated map positions and effects of QTL affecting life span by linkage to highly polymorphic roo transposable element markers, using a multiple-trait composite interval mapping procedure. A minimum of 17 QTL were detected; all were sex and/or environment-specific. Ten of the QTL had sexually antagonistic or antagonistic pleiotropic effects in different environments. These data provide support for the pleiotropy theory of senescence and the hypothesis that variation for longevity might be maintained by opposing selection pressures in males and females and variable environments. Further work is necessary to assess the generality of these results, using different strains, to determine heterozygous effects and to map the life span QTL to the level of genetic loci.
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research-article |
25 |
240 |
3
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Vieira C, Morais S, Ramos S, Delerue-Matos C, Oliveira MBPP. Mercury, cadmium, lead and arsenic levels in three pelagic fish species from the Atlantic Ocean: intra- and inter-specific variability and human health risks for consumption. Food Chem Toxicol 2010; 49:923-32. [PMID: 21193008 DOI: 10.1016/j.fct.2010.12.016] [Citation(s) in RCA: 174] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Revised: 12/14/2010] [Accepted: 12/21/2010] [Indexed: 11/28/2022]
Abstract
Three commonly consumed and commercially valuable fish species (sardine, chub and horse mackerel) were collected from the Northeast and Eastern Central Atlantic Ocean in Portuguese waters during one year. Mercury, cadmium, lead and arsenic amounts were determined in muscles using graphite furnace and cold vapour atomic absorption spectrometry. Maximum mean levels of mercury (0.1715 ± 0.0857 mg/kg, ww) and arsenic (1.139 ± 0.350 mg/kg, ww) were detected in horse mackerel. The higher mean amounts of cadmium (0.0084 ± 0.0036 mg/kg, ww) and lead (0.0379 ± 0.0303 mg/kg, ww) were determined in chub mackerel and in sardine, respectively. Intra- and inter-specific variability of metals bioaccumulation was statistically assessed and species and length revealed to be the major influencing biometric factors, in particular for mercury and arsenic. Muscles present metal concentrations below the tolerable limits considered by European Commission Regulation and Food and Agriculture Organization of the United Nations/World Health Organization (FAO/WHO). However, estimation of non-carcinogenic and carcinogenic health risks by the target hazard quotient and target carcinogenic risk, established by the US Environmental Protection Agency, suggests that these species must be eaten in moderation due to possible hazard and carcinogenic risks derived from arsenic (in all analyzed species) and mercury ingestion (in horse and chub mackerel species).
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Research Support, Non-U.S. Gov't |
15 |
174 |
4
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Swain SM, Ewer MS, Viale G, Delaloge S, Ferrero JM, Verrill M, Colomer R, Vieira C, Werner TL, Douthwaite H, Bradley D, Waldron-Lynch M, Kiermaier A, Eng-Wong J, Dang C. Pertuzumab, trastuzumab, and standard anthracycline- and taxane-based chemotherapy for the neoadjuvant treatment of patients with HER2-positive localized breast cancer (BERENICE): a phase II, open-label, multicenter, multinational cardiac safety study. Ann Oncol 2018; 29:646-653. [PMID: 29253081 PMCID: PMC5888999 DOI: 10.1093/annonc/mdx773] [Citation(s) in RCA: 164] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Background Anti-HER2 therapies are associated with a risk of increased cardiac toxicity, particularly when part of anthracycline-containing regimens. We report cardiac safety of pertuzumab, trastuzumab, and chemotherapy in the neoadjuvant treatment of HER2-positive early breast cancer. Patients and methods BERENICE (NCT02132949) is a nonrandomized, phase II, open-label, multicenter, multinational study in patients with normal cardiac function. In the neoadjuvant period, cohort A patients received four cycles of dose-dense doxorubicin and cyclophosphamide, then 12 doses of standard paclitaxel plus four standard trastuzumab and pertuzumab cycles. Cohort B patients received four standard fluorouracil/epirubicin/cyclophosphamide cycles, then four docetaxel cycles with four standard trastuzumab and pertuzumab cycles. The primary end point was cardiac safety during neoadjuvant treatment, assessed by the incidence of New York Heart Association class III/IV heart failure and of left ventricular ejection fraction declines (≥10 percentage-points from baseline and to a value of <50%). The main efficacy end point was pathologic complete response (pCR, ypT0/is ypN0). Results are descriptive. Results Safety populations were 199 and 198 patients in cohorts A and B, respectively. Three patients [1.5%; 95% confidence interval (CI) 0.31% to 4.34%] in cohort A experienced four New York Heart Association class III/IV heart failure events. Thirteen patients (6.5%; 95% CI 3.5% to 10.9%) in cohort A and four (2.0%; 95% CI 0.6% to 5.1%) in cohort B experienced at least one left ventricular ejection fraction decline. No new safety signals were identified. pCR rates were 61.8% and 60.7% in cohorts A and B, respectively. The highest pCR rates were in the HER2-enriched PAM50 subtype (75.0% and 73.7%, respectively). Conclusion Treatment with pertuzumab, trastuzumab, and common anthracycline-containing regimens for the neoadjuvant treatment of early breast cancer resulted in cardiac and general safety profiles, and pCR rates, consistent with prior studies with pertuzumab. Clinical Trial Information NCT02132949.
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Clinical Trial, Phase II |
7 |
164 |
5
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Vieira C, Diaz MT, Martínez B, García-Cachán MD. Effect of frozen storage conditions (temperature and length of storage) on microbiological and sensory quality of rustic crossbred beef at different states of ageing. Meat Sci 2009; 83:398-404. [PMID: 20416701 DOI: 10.1016/j.meatsci.2009.06.013] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2008] [Revised: 03/05/2009] [Accepted: 06/05/2009] [Indexed: 10/20/2022]
Abstract
The effect of frozen storage conditions on meat from 36 Morucha×Charolais crossbred yearlings was studied. Slices of M. Longissimus thoracis were randomly assigned to groups arising from the combination of experimental factors. These factors were: ageing extent (3 and 10days), length of frozen storage (0, 30, 75 and 90days) and temperature (-20 and -80°C). Regarding microbiological counts, although values were acceptable in all cases, longer storage time and longer previous ageing extent provided higher phychrotrophic bacteria counts. As frozen storage period increased, colorimetric parameters L(∗), a(∗) and C(∗) decreased, but H(∗) increased. Regarding Warner-Braztler shear force and tenderness values, an interaction (p<0.05) between frozen storage and post-mortem ageing resulted from larger differences between frozen storage periods at shorter ageing periods than those at longer ageing periods. Frozen storage for 90days resulted in a reduction in water holding capacity, without differences in juiciness. No effect of freezing temperature was observed in any of the parameters studied.
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Journal Article |
16 |
141 |
6
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Nardon C, Deceliere G, Loevenbruck C, Weiss M, Vieira C, Biémont C. Is genome size influenced by colonization of new environments in dipteran species? Mol Ecol 2005; 14:869-78. [PMID: 15723678 DOI: 10.1111/j.1365-294x.2005.02457.x] [Citation(s) in RCA: 137] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Genome size differences are usually attributed to the amplification and deletion of various repeated DNA sequences, including transposable elements (TEs). Because environmental changes may promote modifications in the amount of these repeated sequences, it has been postulated that when a species colonizes new environments this could be followed by an increase in its genome size. We tested this hypothesis by estimating the genome size of geographically distinct populations of Drosophila ananassae, Drosophila malerkotliana, Drosophila melanogaster, Drosophila simulans, Drosophila subobscura, and Zaprionus indianus, all of which have known colonization capacities. There was no strong statistical differences between continents for most species. However, we found that populations of D. melanogaster from east Africa have smaller genomes than more recent populations. For species in which colonization is a recent event, the differences between genome sizes do not thus seem to be related to colonization history. These findings suggest either that genome size is seldom modified in a significant way during colonization or that it takes time for genome size of invading species to change significantly.
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20 |
137 |
7
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Pasyukova EG, Vieira C, Mackay TF. Deficiency mapping of quantitative trait loci affecting longevity in Drosophila melanogaster. Genetics 2000; 156:1129-46. [PMID: 11063689 PMCID: PMC1461330 DOI: 10.1093/genetics/156.3.1129] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In a previous study, sex-specific quantitative trait loci (QTL) affecting adult longevity were mapped by linkage to polymorphic roo transposable element markers, in a population of recombinant inbred lines derived from the Oregon and 2b strains of Drosophila melanogaster. Two life span QTL were each located on chromosomes 2 and 3, within sections 33E-46C and 65D-85F on the cytological map, respectively. We used quantitative deficiency complementation mapping to further resolve the locations of life span QTL within these regions. The Oregon and 2b strains were each crossed to 47 deficiencies spanning cytological regions 32F-44E and 64C-76B, and quantitative failure of the QTL alleles to complement the deficiencies was assessed. We initially detected a minimum of five and four QTL in the chromosome 2 and 3 regions, respectively, illustrating that multiple linked factors contribute to each QTL detected by recombination mapping. The QTL locations inferred from deficiency mapping did not generally correspond to those of candidate genes affecting oxidative and thermal stress or glucose metabolism. The chromosome 2 QTL in the 35B-E region was further resolved to a minimum of three tightly linked QTL, containing six genetically defined loci, 24 genes, and predicted genes that are positional candidates corresponding to life span QTL. This region was also associated with quantitative variation in life span in a sample of 10 genotypes collected from nature. Quantitative deficiency complementation is an efficient method for fine-scale QTL mapping in Drosophila and can be further improved by controlling the background genotype of the strains to be tested.
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research-article |
25 |
111 |
8
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Vieira C, Lepetit D, Dumont S, Biémont C. Wake up of transposable elements following Drosophila simulans worldwide colonization. Mol Biol Evol 1999; 16:1251-5. [PMID: 10486980 DOI: 10.1093/oxfordjournals.molbev.a026215] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Transposable elements (TEs) make up around 10%-15% of the Drosophila melanogaster genome, but its sibling species Drosophila simulans carries only one third as many such repeat sequences. We do not, however, have an overall view of copy numbers of the various classes of TEs (long terminal repeat [LTR] retrotransposons, non-LTR retrotransposons, and transposons) in genomes of natural populations of both species. We analyzed 34 elements in individuals from various natural populations of these species. We show that D. melanogaster has higher average chromosomal insertion site numbers per genome than D. simulans for all TEs except five. The LTR retrotransposons gypsy, ZAM, and 1731 and the transposon bari-1 present similar low copy numbers in both species. The transposon hobo has a large number of insertion sites, with significantly more sites in D. simulans. High variation between populations in number of insertion sites of some elements of D. simulans suggests that these elements can invade the genome of the entire species starting from a local population. We propose that TEs in the D. simulans genome are being awakened and amplified as they had been a long time ago in D. melanogaster.
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Comparative Study |
26 |
89 |
9
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Wang J, Wang Z, Vieira CLZ, Wolfson JM, Pingtian G, Huang S. Review on the treatment of organic pollutants in water by ultrasonic technology. ULTRASONICS SONOCHEMISTRY 2019; 55:273-278. [PMID: 30712850 DOI: 10.1016/j.ultsonch.2019.01.017] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 01/11/2019] [Accepted: 01/12/2019] [Indexed: 05/12/2023]
Abstract
The application of ultrasonic technology in the treatment of organic pollutants in water has attracted more and more attention in recent years. Compared with conventional treatment, ultrasonic treatment is more efficient and time saving. Ultrasonic technology is effective for the degradation of many refractory organic pollutants. In this paper, the principle, influencing factors and various methods of ultrasonic degradation of organic pollutants are studied in view of ultrasonic treatment alone, ultrasound treatment methods combined with biocatalysts, chemical oxidation and adsorption techniques, respectively. In addition, the problems existing in the treatment of organic pollutants in water by ultrasonic technology are analyzed and the development direction is put forward.
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6 |
79 |
10
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Torres J, Palmela C, Brito H, Bao X, Ruiqi H, Moura-Santos P, Pereira da Silva J, Oliveira A, Vieira C, Perez K, Itzkowitz SH, Colombel JF, Humbert L, Rainteau D, Cravo M, Rodrigues CM, Hu J. The gut microbiota, bile acids and their correlation in primary sclerosing cholangitis associated with inflammatory bowel disease. United European Gastroenterol J 2017; 6:112-122. [PMID: 29435321 DOI: 10.1177/2050640617708953] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 04/12/2017] [Indexed: 12/16/2022] Open
Abstract
Background Patients with primary sclerosing cholangitis associated with inflammatory bowel disease (PSC-IBD) have a very high risk of developing colorectal neoplasia. Alterations in the gut microbiota and/or gut bile acids could account for the increase in this risk. However, no studies have yet investigated the net result of cholestasis and a potentially altered bile acid pool interacting with a dysbiotic gut flora in the inflamed colon of PSC-IBD. Aim The aim of this study was to compare the gut microbiota and stool bile acid profiles, as well as and their correlation in patients with PSC-IBD and inflammatory bowel disease alone. Methods Thirty patients with extensive colitis (15 with concomitant primary sclerosing cholangitis) were prospectively recruited and fresh stool samples were collected. The microbiota composition in stool was profiled using bacterial 16S rRNA sequencing. Stool bile acids were assessed by high-performance liquid chromatography tandem mass spectrometry. Results The total stool bile acid pool was significantly reduced in PSC-IBD. Although no major differences were observed in the individual bile acid species in stool, their overall combination allowed a good separation between PSC-IBD and inflammatory bowel disease. Compared with inflammatory bowel disease alone, PSC-IBD patients demonstrated a different gut microbiota composition with enrichment in Ruminococcus and Fusobacterium genus compared with inflammatory bowel disease. At the operational taxonomic unit level major shifts were observed within the Firmicutes (73%) and Bacteroidetes phyla (17%). Specific microbiota-bile acid correlations were observed in PSC-IBD, where 12% of the operational taxonomic units strongly correlated with stool bile acids, compared with only 0.4% in non-PSC-IBD. Conclusions Patients with PSC-IBD had distinct microbiota and microbiota-stool bile acid correlations as compared with inflammatory bowel disease. Whether these changes are associated with, or may predispose to, an increased risk of colorectal neoplasia needs to be further clarified.
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Journal Article |
8 |
78 |
11
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Vieira C, Evangelista S, Cirillo R, Lippi A, Maggi CA, Manzini S. Effect of ricinoleic acid in acute and subchronic experimental models of inflammation. Mediators Inflamm 2000; 9:223-8. [PMID: 11200362 PMCID: PMC1781768 DOI: 10.1080/09629350020025737] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Observational studies indicate that topical application of ricinoleic acid (RA), the main component of castor oil, exerts remarkable analgesic and anti-inflammatory effects. Pharmacological characterization has shown similarities between the effects of RA and those of capsaicin, suggesting a potential interaction of this drug on sensory neuropeptide-mediated neurogenic inflammation. The aim of this study was to assess RA anti-inflammatory activities in comparison with capsaicin in several models of acute and subchronic inflammation. The acute inflammation was induced by intradermal injection of carrageenan in the mouse or by histamine in the guinea-pig eyelid. In either experiment, the extent of the oedema thickness was measured. Subchronic oedema was induced by complete Freund's adjuvant injection in the ventral right paw of mice. Tissue substance P (SP) was measured in the carrageenan experiments by radioimmunoassay (RIA). It was found that the acute topical application of RA (0.9 mg/mouse) or capsaicin (0.09 mg/mouse) significantly increased the mouse paw oedema induced by carrageenan, while an 8-day repeated topical treatment with the same doses of both compounds resulted in a marked inhibition of carrageenan-induced paw oedema matched by a reduction in SP tissue levels. Similar effects were found against histamine-induced eyelid oedema in guinea-pigs after acute or repeated application of RA or capsaicin. RA and capsaicin given for 1-3 weeks reduced the established oedema induced by Freund's adjuvant, a subchronic model of inflammation, particularly if given by the intradermal route. Either in mouse paw or in guinea-pig eyelid, capsaicin but not RA by itself produced a slight hyperemia and activation of a behavioural response (e.g. scratching of the eyelids). On the basis of the present results, RA may be seen as a new capsaicin-like, non-pungent anti-inflammatory agent suitable for peripheral application.
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research-article |
25 |
57 |
12
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Vieira C, Martinez S. Sonic hedgehog from the basal plate and the zona limitans intrathalamica exhibits differential activity on diencephalic molecular regionalization and nuclear structure. Neuroscience 2006; 143:129-40. [PMID: 17045408 DOI: 10.1016/j.neuroscience.2006.08.032] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2006] [Revised: 08/07/2006] [Accepted: 08/16/2006] [Indexed: 01/03/2023]
Abstract
The diencephalon is the most complex area of the vertebrate brain, being particularly complex in amniotes. It has been suggested that diencephalic regionalization partially depends on local signaling mediated by sonic hedgehog (Shh). However, since the Shh gene is expressed in both the diencephalic basal plate and the zona limitans intrathalamica (ZLI), it is still unclear which of these tissues exerts morphogenetic influence on thalamic regionalization. In the present study using chick and quail embryos, we have found that although Shh from the ZLI and the basal plate induces ectopic expression of diencephalic genes in the posterior prosencephalic alar plate, only Shh originating from the ZLI can induce ectopic gene expression in the anterior alar plate, indicating that the ZLI exerts specific activity in the anterior epithelium. By introducing microbarriers between the diencephalic alar neuroepithelium and either the ZLI or the basal plate, we generated local loss of Shh expression in the ZLI, leading to alterations in molecular regionalization and subsequently, in the nuclear organization of the alar diencephalic derivatives on both sides of the ZLI. We thus demonstrate in vivo that basal signals are required to induce Shh expression in the ZLI and that Shh from the ZLI plays a pivotal role in regionalizing the alar diencephalon. The structural phenotype of Shh abolition in the ZLI consisted of a progressive pattern of alterations in diencephalic organization which were associated with the observed gradient effects in the molecular regionalization of the diencephalon. We conclude that the ZLI is a secondary organizer which exerts its morphogenetic activity through Shh.
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55 |
13
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letter |
28 |
55 |
14
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Abstract
Mastication is a rhythmic activity that can be modified by peripheral information generated in the mouth. To study whether taste cognition could influence the way in which a food is broken down in the mouth, subjects masticated firm, sugar-based gelatine gels with differing concentrations of quinine, up to 1500 μmol/kg, while electromyography (EMG) of masticatory muscles was recorded. Taste intensity and composition of saliva were measured. With increasing quinine concentration, the average number of chews for nine subjects decreased from 30 to 22, and their average clearance time increased from 7 to 14 sec. Quinine concentration had no effect on chewing frequency (1.3 Hz) or on the rate of salivation (5.5 g/min). Bitterness increased, while acceptability and sweetness decreased, with increasing concentration of quinine in the gel and in saliva. Taste cognition could therefore modify food breakdown in the mouth.
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9 |
48 |
15
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Junakovic N, Terrinoni A, Di Franco C, Vieira C, Loevenbruck C. Accumulation of transposable elements in the heterochromatin and on the Y chromosome of Drosophila simulans and Drosophila melanogaster. J Mol Evol 1998; 46:661-8. [PMID: 9608048 DOI: 10.1007/pl00006346] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The elements of the transposon families G, copia, mdg 1, 412, and gypsy that are located in the heterochromatin and on the Y chromosome have been identified by the Southern blotting technique in Drosophila simulans and D. melanogaster populations. Within species, the abundance of such elements differs between transposon families. Between species, the abundance in the heterochromatin and on the Y chromosome of the elements of the same family can differ greatly suggesting that differences within a species are unrelated to structural features of elements. By shedding some new light on the mechanism of accumulation of transposable elements in the heterochromatin, these data appear relevant to the understanding of the long-term interaction between transposable elements and the host genome.
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Comparative Study |
27 |
46 |
16
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Vieira C, Fetzer S, Sauer SK, Evangelista S, Averbeck B, Kress M, Reeh PW, Cirillo R, Lippi A, Maggi CA, Manzini S. Pro- and anti-inflammatory actions of ricinoleic acid: similarities and differences with capsaicin. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2001; 364:87-95. [PMID: 11534859 DOI: 10.1007/s002100100427] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We have investigated the pro- and anti-inflammatory effects of ricinoleic acid (RA), the main active principle of castor oil, in an experimental model of blepharitis induced by intradermal injection of carrageenan in the guinea-pig eyelid and its possible capsaicin-like mode of action on acutely dissociated rat dorsal root ganglia (DRG) neurons in vitro. Topical treatment with RA (10-100 mg/guinea-pig) or capsaicin (1-10 mg/guinea-pig) caused eyelid reddening and oedema. At lower doses (0.3-3 mg/guinea-pig and 0.009-0.09 mg/guinea-pig for RA and capsaicin, respectively) both drugs significantly potentiated the eyelid oedema induced by carrageenan. The tachykinin NK1 receptor antagonist FK 888 (0.59 mg/kg s.c.) abolished the potentiation of carrageenan-induced eyelid oedema induced by either RA or capsaicin. The neutral endopeptidase inhibitor, thiorphan (1.3 mg/kg i.v.) significantly enhanced the potentiation of carrageenan-induced eyelid oedema produced by RA. This potentiating effect was abolished by FK 888. Repeated (8 days) topical application of RA (0.9 mg/guinea-pig) or capsaicin (0.09 mg/guinea-pig) inhibited the carrageenan-induced eyelid oedema. This anti-inflammatory effect was accompanied by a reduction (75%-80% of SP and 46%-51% of NKA) in tachykinin content of the eyelids, as determined by radioimmunoassay. In dissociated rat DRG neurons, RA (0.1 mM for 5 min) significantly inhibited the inward currents induced by application of capsaicin (1 microM) and/or low pH (5.8), without inducing any currents by itself or changing voltage-dependent currents. Moreover, after 24-h incubation, RA (0.1 mM) significantly decreased the capsaicin (1 microM)-induced calcitonin gene-related peptide (CGRP) release from rat DRG neurons, whereas acute drug superfusion did not evoke CGRP release by itself. Summarizing, RA possesses capsaicin-like dual pro-inflammatory and anti-inflammatory properties which are observed upon acute and repeated application, respectively. However, unlike capsaicin, RA does not induce inward current in DRG neurons and it is devoid of algesic properties in vivo.
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Comparative Study |
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39 |
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Biémont C, Vieira C. What transposable elements tell us about genome organization and evolution: the case of Drosophila. Cytogenet Genome Res 2005; 110:25-34. [PMID: 16093655 DOI: 10.1159/000084935] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2003] [Accepted: 10/23/2003] [Indexed: 11/19/2022] Open
Abstract
Transposable elements (TEs) have been identified in every organism in which they have been looked for. The sequencing of large genomes, such as the human genome and those of Drosophila, Arabidopsis, Caenorhabditis, has also shown that they are a major constituent of these genomes, accounting for 15% of the genome of Drosophila, 45% of the human genome, and more than 70% in some plants and amphibians. Compared with the 1% of genomic DNA dedicated to protein-coding sequences in the human genome, this has prompted various researchers to suggest that the TEs and the other repetitive sequences that constitute the so-called "noncoding DNA", are where the most stimulating discoveries will be made in the future (Bromham, 2002). We are therefore getting further and further from the original idea that this DNA was simply "junk DNA", that owed its presence in the genome entirely to its capacity for selfish transposition. Our understanding of the structures of TEs, their distribution along the genomes, their sequence and insertion polymorphisms within genomes, and within and between populations and species, their impact on genes and on the regulatory mechanisms of genetic expression, their effects on exon shuffling and other phenomena that reshape the genome, and their impact on genome size has increased dramatically in recent years. This leads to a more general picture of the impact of TEs on genomes, though many copies are still mainly selfish or junk DNA. In this review we focus mainly on discoveries made in Drosophila, but we also use information about other genomes when this helps to elucidate the general processes involved in the organization, plasticity, and evolution of genomes.
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Vieira C, Biémont C. Geographical variation in insertion site number of retrotransposon 412 in Drosophila simulans. J Mol Evol 1996; 42:443-51. [PMID: 8642613 DOI: 10.1007/bf02498638] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The insertion site number of the retrotransposable element 412 was analyzed in natural populations of Drosophila simulans of worldwide origin by in situ hybridization. We observe a gradient in copy number ranging from as high as 23 in Europe to 1-10 in South Africa, while populations in Madagascar and the Indian Islands, which are the cradle of D. simulans, have only 3-7 copies. We find very different copy numbers in some local populations of Australia and the Pacific Islands (with around 60 copies in 1 sample and only 5 in another), suggesting spontaneous transposition bursts in local populations. Such bursts occurring now and then in local natural populations followed by fly migration could lead to the progressive invasion of the entire species by the transposable element mobilized, explaining the gradient in 412 copy number between northern and southern hemispheres.
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Vieira C, Biémont C. Transposition rate of the 412 retrotransposable element is independent of copy number in natural populations of Drosophila simulans. Mol Biol Evol 1997; 14:185-8. [PMID: 9029796 DOI: 10.1093/oxfordjournals.molbev.a025751] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The transposition and excision rates of the 412 retrotransposable element were estimated in five populations of Drosophila simulans differing in their average 412 copy numbers, which ranged from 2 to 54. The transposition rate was found to equal 1 x 10(-3) to 2 x 10(-3), independently of copy number. No excision was detected. These values eliminate autoregulation as a force maintaining copy number of the 412 element in natural populations of D. simulans.
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Blomberg AJ, Coull BA, Jhun I, Vieira CLZ, Zanobetti A, Garshick E, Schwartz J, Koutrakis P. Effect modification of ambient particle mortality by radon: A time series analysis in 108 U.S. cities. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2019; 69:266-276. [PMID: 30230977 PMCID: PMC6391221 DOI: 10.1080/10962247.2018.1523071] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 09/07/2018] [Accepted: 09/07/2018] [Indexed: 05/21/2023]
Abstract
Numerous studies have reported a positive association between ambient fine particles and daily mortality, but little is known about the particle properties or environmental factors that may contribute to these effects. This study assessed potential modification of radon on PM2.5 (particulate matter with an aerodynamic diameter <2.5 μm)-associated daily mortality in 108 U.S. cities using a two-stage statistical approach. First, city- and season-specific PM2.5 mortality risks were estimated using over-dispersed Poisson regression models. These PM2.5 effect estimates were then regressed against mean city-level residential radon concentrations to estimate overall PM2.5 effects and potential modification by radon. Radon exposure estimates based on measured short-term basement concentrations and modeled long-term living-area concentrations were both assessed. Exposure to PM2.5 was associated with total, cardiovascular, and respiratory mortality in both the spring and the fall. In addition, higher mean city-level radon concentrations increased PM2.5-associated mortality in the spring and fall. For example, a 10 µg/m3 increase in PM2.5 in the spring at the 10th percentile of city-averaged short-term radon concentrations (21.1 Bq/m3) was associated with a 1.92% increase in total mortality (95% CI: 1.29, 2.55), whereas the same PM2.5 exposure at the 90th radon percentile (234.2 Bq/m3) was associated with a 3.73% increase in total mortality (95% CI: 2.87, 4.59). Results were robust to adjustment for spatial confounders, including average planetary boundary height, population age, percent poverty and tobacco use. While additional research is necessary, this study suggests that radon enhances PM2.5 mortality. This is of significant regulatory importance, as effective regulation should consider the increased risk for particle mortality in cities with higher radon levels. Implications: In this large national study, city-averaged indoor radon concentration was a significant effect modifier of PM2.5-associated total, cardiovascular, and respiratory mortality risk in the spring and fall. These results suggest that radon may enhance PM2.5-associated mortality. In addition, local radon concentrations partially explain the significant variability in PM2.5 effect estimates across U.S. cities, noted in this and previous studies. Although the concept of PM as a vector for radon progeny is feasible, additional research is needed on the noncancer health effects of radon and its potential interaction with PM. Future air quality regulations may need to consider the increased risk for particle mortality in cities with higher radon levels.
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Research Support, N.I.H., Extramural |
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Vieira CLZ, Caramelli B. The history of dentistry and medicine relationship: could the mouth finally return to the body? Oral Dis 2009; 15:538-46. [PMID: 19619191 DOI: 10.1111/j.1601-0825.2009.01589.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The relationship between dentistry and medicine has been acknowledged throughout the history of humanity. This relationship was documented in ancient medicine accounts, and has survived until the present day, accompanied by the evolution of molecular technologies. Although we have had very important researchers' contributions in this interdisciplinary area, mainly after the 18th century, the knowledge on oral infections is still ignored by or unknown to the majority of clinical dentists and physicians. These circumstances could be changed through a broader divulgation of this complex relationship, both in the dentistry and in the medicine areas, which in turn would have a significant impact in systemic health worldwide. This movement has already started, as was observed in a World Health Assembly resolution which called for oral health to be integrated into chronic disease prevention programs in 2007. This was a significant indicator of changing perceptions of oral health over the past several decades. This brief review reports the evolution through time of the knowledge on the association between dental infections and systemic diseases, as well as the paths which we could take to consolidate this historical trend.
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Review |
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Díaz MT, Vieira C, Pérez C, Lauzurica S, de Chávarri EG, Sánchez M, De la Fuente J. Effect of lairage time ( 0h, 3 h, 6 h or 12 h) on glycogen content and meat quality parameters in suckling lambs. Meat Sci 2013; 96:653-60. [PMID: 24200553 DOI: 10.1016/j.meatsci.2013.10.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 10/03/2013] [Accepted: 10/07/2013] [Indexed: 11/16/2022]
Abstract
The effect of slaughter at arrival (L0) or after 3 (L3), 6 (L6), 12 (L12) h of lairage on carcass and meat quality of suckling lambs has been studied. Lairage time had a slight effect on carcass quality traits, but most of the meat quality parameters at 24h post mortem were affected. Weight losses increased and glycogen content of liver and longissimus muscle decreased as lairage time increased. Longissimus muscle from L3 lambs had the highest pH, shear force and toughness and the lowest b* and C* values, at 24h post mortem. L3 and L6 had the higher proportion of expelled juice, or low water holding capacity (WHC), at 24h post mortem. Texture parameters and WHC were similar among groups after 5 days of storage. Despite the fact that the effects of lairage time on meat quality disappears after storage, from the point of view of weight losses the slaughter of suckling lambs at arrival is recommended.
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Research Support, Non-U.S. Gov't |
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Gu X, Zhao Y, Sun K, Vieira CLZ, Jia Z, Cui C, Wang Z, Walsh A, Huang S. Method of ultrasound-assisted liquid-phase exfoliation to prepare graphene. ULTRASONICS SONOCHEMISTRY 2019; 58:104630. [PMID: 31450336 DOI: 10.1016/j.ultsonch.2019.104630] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/05/2019] [Accepted: 06/07/2019] [Indexed: 06/10/2023]
Abstract
Graphene is a two-dimensional material with unique structure and excellent properties. After first being successfully prepared in 2004, it rapidly became a research hotspot in the fields of materials, chemistry, physics, and engineering. Currently, there are many methods for preparing graphene, such as ball milling method, chemical oxidation-reduction, chemical vapor deposition, and liquid-phase exfoliation. Among these methods, liquid-phase exfoliation is the most important preparation method. In this paper, ultrasound-assisted liquid-phase exfoliation is systematically studied. The output power and frequency of the ultrasonic crusher used in the experiment are 100 W and 20 kHz, respectively. Results show that ultrasonic waves can affect the size and thickness distribution of graphene sheets; ultrasound-assisted deoxycholic acid sodium aqueous solution has a good exfoliation effect. In addition, the effects of the 3 liquid-phase systems on preparing graphene are studied, including organic solvent system, aqueous surfactant system, and ionic liquids system; the improvement efforts for ultrasound-assisted liquid-phase exfoliation method are discussed including the exploration of new solvents and optimization of exfoliation process. The application of auxiliary agent-assisted liquid-phase exfoliation method is also discussed.
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Vieira C, Evangelista S, Cirillo R, Terracciano R, Lippi A, Maggi CA, Manzini S. Antinociceptive activity of ricinoleic acid, a capsaicin-like compound devoid of pungent properties. Eur J Pharmacol 2000; 407:109-16. [PMID: 11050297 DOI: 10.1016/s0014-2999(00)00727-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The antinociceptive effect of ricinoleic acid ([R-(Z)]-12-hydroxy-9-octadecenoic acid) in comparison with capsaicin (trans-8-methyl-N-vanillyl-6-nonenamide) has been investigated in several "in vivo" tests. Acute topical application of capsaicin, but not ricinoleic acid, produced by itself an hyperalgesic effect detected as a decrease in paw withdrawal latency in response to a painful (heat) stimulus in mice. Capsaicin, but not ricinoleic acid at any dose tested, showed an irritant effect in the wiping test in guinea pig conjunctiva after local application and in the paw licking test in mice after intradermal injection. Whereas acute application of ricinoleic acid or capsaicin decreased paw withdrawal latency to heat in the presence of a pre-existing inflammation (injection of carrageenan in the mouse paw), the repeated local treatment for 8 days with either compounds markedly increased paw withdrawal latency. In a chronic model of inflammation (complete Freund's adjuvant arthritis in mice), the repeated topical and intradermal treatments with both ricinoleic acid and capsaicin increased paw withdrawal latency to heat, the antinociceptive effect of ricinoleic acid being more persistent than that of capsaicin. Antinociceptive effect of 8 days of treatment with ricinoleic acid and capsaicin was observed in acetic acid-induced writhing in mice, capsaicin-induced foot licking in mice and capsaicin-induced wiping movements in guinea pig conjunctiva. A decrease of substance P tissue levels in the mouse paw was found after repeated treatment with ricinoleic acid. In conclusion, ricinoleic acid seems to be a new antinociceptive agent lacking the pungent and acute hyperalgesic properties of capsaicin.
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Vieira C, Aubry P, Lepetit D, Biémont C. A temperature cline in copy number for 412 but not roo/B104 retrotransposons in populations of Drosophila simulans. Proc Biol Sci 1998; 265:1161-5. [PMID: 9699309 PMCID: PMC1689186 DOI: 10.1098/rspb.1998.0413] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The copy number of the retrotransposable element 412 of Drosophila simulans from populations collected worldwide shows a negative correlation with minimum temperature. No association was detected for the roo/B104 element. The possibility that selective pressures might regulate the 412 copy number in these natural populations is supported by detection of selection against the detrimental effects of 412 insertions (estimated by the proportion of insertions on the X chromosome in comparison with the autosomes) but not roo/B104. These data reveal different spatial patterns for two element families, and strongly suggest that some factors in the environment, such as temperature, may interfere with the control of retrotransposition, thus affecting important aspects of genomic evolution.
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