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- 저자 : Marta Machado (검색결과 4 건)
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Seribelli Amanda Aparecida,Ribeiro Tamara R. Machado,da Silva Patrick,Martins Isabela Mancini,Vilela Felipe Pinheiro,Medeiros Marta I. Cazentini,Peronni Kamila Chagas,da Silva Junior Wilson Araújo,Mor 한국미생물학회 2021 The journal of microbiology Vol.59 No.9
Salmonella Typhimurium (ST313) has caused an epidemic of invasive disease in sub-Saharan Africa and has been recently identified in Brazil. As the virulence of this ST is poorly understood, the present study aimed to (i) perform the RNAseq in vitro of S. Typhimurium STm30 (ST313) grown in Luria-Bertani medium at 37°C; (ii) compare it with the RNAseq of the S. Typhimurium SL1344 (ST19) and S. Typhimurium STm11 (ST19) strains under the same growing conditions; and (iii) examine the colonization capacity and expression of virulence genes and cytokines in murine colon. The STm30 (ST313) strain exhibited stronger virulence and was associated with a more inflammatory profile than the strains SL1344 (ST19) and STm11 (ST19), as demonstrated by transcriptome and in vivo assay. The expression levels of the hilA, sopD2, pipB, and ssaS virulence genes, other Salmonella pathogenicity islands SPI-1 and SPI-2 genes or effectors, and genes of the cytokines IL-1β, IFN-γ, TNF-α, IL-6, IL-17, IL-22, and IL-12 were increased during ST313 infection in C57BL/6J mice. In conclusion, S. Typhimurium STm30 (ST313) isolated from human feces in Brazil express higher levels of pathogenesis- related genes at 37°C and has stronger colonization and invasion capacity in murine colon due to its high expression levels of virulence genes, when compared with the S. Typhimurium SL1344 (ST19) and STm11 (ST19) strains. STm30 (ST313) also induces stronger expression of pro-inflammatory cytokines in this organ, suggesting that it causes more extensive tissue damage.
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Piglets' Surface Temperature Change at Different Weights at Birth
Caldara, Fabiana Ribeiro,dos Santos, Luan Sousa,Machado, Sivanilza Teixeira,Moi, Marta,de Alencar Naas, Irenilza,Foppa, Luciana,Garcia, Rodrigo Garofallo,de Kassia Silva dos Santos, Rita Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.3
The study was carried out in order to verify the effects of piglets' weight at birth on their surface temperature change (ST) after birth, and its relationship with ingestion time of colostrum. Piglets from four different sows were weighed at birth and divided into a totally randomized design with three treatments according to birth weight (PBW): T1 - less than 1.00 kg, T2 - 1.00 to 1.39 kg, and T3 - higher than or equal to 1.40 kg. The time spent for the first colostrum ingestion was recorded (TFS). Images of piglets' surface by thermal imaging camera were recorded at birth (STB) and 15, 30, 45, 60, and 120 min after birth. The air temperature and relative humidity were recorded every 30 min and the indexes of temperature and humidity (THI) were calculated. A ST drop after 15 min from birth was observed, increasing again after sixty minutes. Positive correlations were found between the PBW and the ST at 30 and 45 min after birth. The PBW was negatively correlated with the TFS. The THI showed high negative correlations (-0.824 and -0.815) with STB and after 15 min from birth. The piglet's surface temperature at birth was positively correlated with temperature thereof to 15 min, influencing therefore the temperatures in the interval of 45 to 120 min. The birth weight contributes significantly to postnatal hypothermia and consequently to the time it takes for piglets ingest colostrum, requiring special attention to those of low birth weight.
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Olmiro Cezimbra de Souza Filho,Michele Rorato Sagrillo,Luiz Filipe Machado Garcia,Alencar Kolinski Machado,Francine Cadona,Euler Esteves Ribeiro,Marta Maria Medeiros Frescura Duarte,Ademir Farias More 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.11
Tucuma (Astrocaryum aculeatum) is an Amazonian fruit that presents high levels of carotenoids and other bioactive compounds such as quercetin. The extracts of tucuma peel and pulp present strong antioxidant activity which illustrate an elevated concentration that causes cytotoxic effects in human peripheral blood mononuclear cells (PBMCs). This study performed additional investigations to analyze the potential genotoxic effects of the tucuma extracts on PBMCs. The genotoxicity was evaluated by DNA fragmentation, Comet assay, and chromosomal instability G-band assays. The acute tucuma extract treatment showed genoprotective effects against DNA denaturation when compared with untreated PBMC cells. However, in the experiments with 24 and 72 h treatments to tucuma treatments, we observed low genotoxicity through a concentration of 100 lg/mL, some genotoxic effects related to intermediary concentrations (100–500 lg/mL), and more pronounced genotoxic effects on higher tucuma extract concentrations. After 24 h of treatment, the reactive oxygen species were similar among treatments and PBMC control groups. However, the caspase-1 activity related to the apoptosis and pyroptosis process increased significantly in higher tucuma concentrations. In summary, tucuma extracts, despite their higher antioxidant content and antioxidant activity, would present PBMCs genotoxic effects that are dependent on concentration and time exposition. These results need to be considered in future in vitro and in vivo studies of tucuma effects.
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Marcela S ˇ afratova,Anna Hosˇt’a´lkova,Daniela Hulcova,Katerˇina Breiterova,Veronika Hrabcova,Marta Machado,Diana Fontinha,Miguel Prudeˆncio,Jirˇı´ Kunes,Jakub Chlebek,Daniel Jun,Martina Hrabinova,Lu 대한약학회 2018 Archives of Pharmacal Research Vol.41 No.2
Fifteen Amaryllidaceae alkaloids (1–15) of variousstructural types were isolated by standard chromatographicmethods from fresh bulbs of Narcissus poeticus cv. Pink Parasol. The chemical structures were elucidated byMS, and 1D and 2D NMR spectroscopic analyses, and bycomparison with literature data. Narcipavline (5) and narcikachnine(6) are reported here for the first time. In theirstructure are combined two basic structural types ofAmaryllidaceae alkaloids (galanthamine- and galanthindole-structural types), which represent a new structuraltype of these compounds. Alkaloids isolated in sufficientamounts were evaluated for their human erythrocyticacetylcholinesterase, and human serum butyrylcholinesterase(HuBuChE) inhibition activity using Ellman’smethod. Z-Gly-Pro-p-nitroanilide was used assubstrate in the prolyl oligopeptidase (POP) assay. Untestedalkaloids were also screened for their cytotoxic activityagainst a small panel of human cancer cells, which spannedcell lines from different tissue types. In parallel, MRC-5human fibroblasts were employed to determine overalltoxicity against noncancerous cells. Some compounds wereevaluated for their antiprotozoal activity. The newly isolatedalkaloid narcipavline (5) showed interestingHuBuChE inhibition activity (IC50 = 24.4 ± 1.2 lM), andnorlycoramine (11) demonstrated promising POP inhibition(IC50 = 0.21 ± 0.01 mM).
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