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Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas

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https://www.readbyqxmd.com/read/28198910/alemtuzumab-as-graft-versus-host-disease-gvhd-prophylaxis-strategy-in-a-developing-country-lower-rate-of-acute-gvhd-increased-risk-of-cytomegalovirus-reactivation
#1
C B Resende, B M Rezende, P T T Bernardes, G M Teixeira, M M Teixeira, V Pinho, H Bittencourt
Acute graft-versus-host disease (aGVHD) and cytomegalovirus reactivation are important complications after allogeneic stem cell transplantation (alloHSCT). Here, we evaluated the impact of treatment with alemtuzumab on the occurrence of aGVHD, cytomegalovirus reactivation and survival after alloHSCT. This was a prospective cohort study conducted at the allo-HSCT unit of Hospital das Clínicas, Universidade Federal de Minas Gerais, Brazil, from January 2009 to December 2011. Fifty-seven patients who underwent alloHSCT were included...
February 9, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28177059/microrna-122-regulates-caspase-8-and-promotes-the-apoptosis-of-mouse-cardiomyocytes
#2
Z W Zhang, H Li, S S Chen, Y Li, Z Y Cui, J Ma
Cardiomyocyte apoptosis plays key roles in the pathogenesis of heart diseases such as myocardial infarction. MicroRNAs are important regulators of gene expression, which are also involved in the regulation of cardiomyocyte apoptosis. However, cardiomyocyte apoptosis regulated by microRNA (miR)-122 is largely unexplored. The aim of this study focused on the role of miR-122 in cardiomyocyte apoptosis. Cardiomyocytes were isolated from neonatal mice and primarily cultured. MiR-122 mimic and inhibitor were transfected to cardiomyocytes and verified by qRT-PCR...
February 6, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28177058/effect-of-tobacco-smoke-on-hydrogen-sulfide-induced-rat-thoracic-aorta-relaxation
#3
H T Zhang, T Zhang, M Chai, J J Sun, X Y Yu, C Z Liu, C C Huang
Levels of hydrogen sulfide (H2S), a gaseous signaling molecule, are reduced in the serum of individuals who smoke. We hypothesized that tobacco smoke influenced smooth muscle relaxation by decreasing H2S levels and this effect could also influence expression of cystathionine γ-lyase (CSE) and sulfonylurea receptor-2 (SUR-2). The aim of this study was to explore the effect of tobacco smoke on H2S-mediated rat thoracic aorta relaxation and its possible mechanism. Thirty-two Sprague-Dawley rats were divided into four groups: control (C) group, short-term smoker (SS) group, mid-term smoker (MS) group, and long-term smoker (LS) group...
February 6, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28177057/salivary-cortisol-and-%C3%AE-amylase-subclinical-indicators-of-stress-as-cardiometabolic-risk
#4
S Cozma, L C Dima-Cozma, C M Ghiciuc, V Pasquali, A Saponaro, F R Patacchioli
Currently, the potential for cardiovascular (CV) stress-induced risk is primarily based on the theoretical (obvious) side effects of stress on the CV system. Salivary cortisol and α-amylase, produced respectively by the hypothalamus-pituitary-adrenal (HPA) axis and the sympathetic-adrenomedullary (SAM) system during stress response, are still not included in the routine evaluation of CV risk and require additional and definitive validation. Therefore, this article overviews studies published between 2010 and 2015, in which salivary cortisol and α-amylase were measured as stress biomarkers to examine their associations with CV/CMR (cardiometabolic risk) clinical and subclinical indicators...
February 6, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28177038/35-years-of-the-brazilian-journal-of-medical-and-biological-research
#5
EDITORIAL
E M Rego, J Pereira Leite, I Bensenor, R Chammas, J Nogueira de Francischi, P L da Luz
The authors pay homage to the three founders of the Brazilian Journal of Medical and Biological Research Profs. Lewis Joel Greene, Sérgio Henrique Ferreira and Eduardo Moacyr Krieger for their vision and commitment to divulge the scientific production of developing countries.
February 6, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28146217/neoadjuvant-chemotherapy-with-trastuzumab-in-her2-positive-breast-cancer-pathologic-complete-response-rate-predictive-and-prognostic-factors
#6
I P C Buzatto, A Ribeiro-Silva, J M Andrade, H H A Carrara, W A Silveira, D G Tiezzi
The purpose of this study was to retrospectively review the pathologic complete response (pCR) rate from patients (n=86) with stage II and III HER2-positive breast cancer treated with neoadjuvant chemotherapy at our institution from 2008 to 2013 and to determine possible predictive and prognostic factors. Immunohistochemistry for hormone receptors and Ki-67 was carried out. Clinical and pathological features were analyzed as predictive factors of response to therapy. For survival analysis, we used Kaplan-Meier curves to estimate 5-year survival rates and the log-rank test to compare the curves...
January 26, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28146216/serum-total-bilirubin-levels-are-negatively-correlated-with-metabolic-syndrome-in-aged-chinese-women-a-community-based-study
#7
P Zhong, D M Sun, D H Wu, T M Li, X Y Liu, H Y Liu
We evaluated serum total bilirubin levels as a predictor for metabolic syndrome (MetS) and investigated the relationship between serum total bilirubin levels and MetS prevalence. This cross-sectional study included 1728 participants over 65 years of age from Eastern China. Anthropometric data, lifestyle information, and previous medical history were collected. We then measured serum levels of fasting blood-glucose, total cholesterol, triglycerides, and total bilirubin, as well as alanine aminotransferase activity...
January 26, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28099584/iodine-131-treatment-of-thyroid-cancer-cells-leads-to-suppression-of-cell-proliferation-followed-by-induction-of-cell-apoptosis-and-cell-cycle-arrest-by-regulation-of-b-cell-translocation-gene-2-mediated-jnk-nf-%C3%AE%C2%BAb-pathways
#8
L M Zhao, A X Pang
Iodine-131 (131I) is widely used for the treatment of thyroid-related diseases. This study aimed to investigate the expression of p53 and BTG2 genes following 131I therapy in thyroid cancer cell line SW579 and the possible underlying mechanism. SW579 human thyroid squamous carcinoma cells were cultured and treated with 131I. They were then assessed for 131I uptake, cell viability, apoptosis, cell cycle arrest, p53 expression, and BTG2 gene expression. SW579 cells were transfected with BTG2 siRNA, p53 siRNA and siNC and were then examined for the same aforementioned parameters...
January 16, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28099583/swimming-training-prevents-coronary-endothelial-dysfunction-in-ovariectomized-spontaneously-hypertensive-rats
#9
E R G Claudio, S A Almeida, V Mengal, G A Brasil, C H Santuzzi, R V Tiradentes, S A Gouvea, N S Bissoli, R L Santos, G R Abreu
Estrogen deficiency and hypertension are considered major risk factors for the development of coronary heart disease. On the other hand, exercise training is considered an effective form to prevent and treat cardiovascular diseases. However, the effects of swimming training (SW) on coronary vascular reactivity in female ovariectomized hypertensive rats are not known. We aimed to evaluate the effects of SW on endothelium-dependent coronary vasodilation in ovariectomized hypertensive rats. Three-month old spontaneously hypertensive rats (SHR, n=50) were divided into four groups: sham (SH), sham plus swimming training (SSW), ovariectomized (OVX), and ovariectomized plus swimming training (OSW)...
January 16, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28099582/a-simple-and-efficient-method-for-poly-3-hydroxybutyrate-quantification-in-diazotrophic-bacteria-within-5-minutes-using-flow-cytometry
#10
L P S Alves, A T Almeida, L M Cruz, F O Pedrosa, E M de Souza, L S Chubatsu, M Müller-Santos, G Valdameri
The conventional method for quantification of polyhydroxyalkanoates based on whole-cell methanolysis and gas chromatography (GC) is laborious and time-consuming. In this work, a method based on flow cytometry of Nile red stained bacterial cells was established to quantify poly-3-hydroxybutyrate (PHB) production by the diazotrophic and plant-associated bacteria, Herbaspirillum seropedicae and Azospirillum brasilense. The method consists of three steps: i) cell permeabilization, ii) Nile red staining, and iii) analysis by flow cytometry...
January 16, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28099581/minimal-residual-disease-detection-in-tunisian-b-acute-lymphoblastic-leukemia-based-on-immunoglobulin-gene-rearrangements
#11
S Besbes, W S Hamadou, M L Boulland, Y B Youssef, B Achour, H Regaieg, A Khelif, T Fest, Z Soua
IGH gene rearrangement and IGK-Kde gene deletion can be used as molecular markers for the assessment of B lineage acute lymphoblastic leukemia (B-ALL). Minimal residual disease detected based on those markers is currently the most reliable prognosis factor in B-ALL. The aim of this study was to use clonal IGH/IGK-Kde gene rearrangements to confirm B-ALL diagnosis and to evaluate the treatment outcome of Tunisian leukemic patients by monitoring the minimal residual disease (MRD) after induction chemotherapy...
January 16, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28076455/decreased-platelet-responsiveness-to-clopidogrel-correlates-with-cyp2c19-and-pon1-polymorphisms-in-atherosclerotic-patients
#12
J F M Marchini, M R Pinto, G C Novaes, A V Badran, R B Pavão, G L Figueiredo, I M Lago, M O Lima-Filho, D C Lemos, M Tonani, C M Antloga, L Oliveira, J C Lorenzi, J A Marin-Neto
Clopidogrel and aspirin are the most commonly used medications worldwide for dual antiplatelet therapy after percutaneous coronary intervention. However, clopidogrel hyporesponsiveness related to gene polymorphisms is a concern. Populations with higher degrees of genetic admixture may have increased prevalence of clopidogrel hyporesponsiveness. To assess this, we genotyped CYP2C19, ABCB1, and PON1 in 187 patients who underwent percutaneous coronary intervention. Race was self-defined by patients. We also performed light transmission aggregometry with adenosine diphosphate (ADP) and arachidonic acid during dual antiplatelet therapy...
January 9, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28076452/angiotensin-1-7-relieved-renal-injury-induced-by-chronic-intermittent-hypoxia-in-rats-by-reducing-inflammation-oxidative-stress-and-fibrosis
#13
W Lu, J Kang, K Hu, S Tang, X Zhou, S Yu, L Xu
We aimed to study the renal injury and hypertension induced by chronic intermittent hypoxia (CIH) and the protective effects mediated by angiotensin 1-7 [Ang(1-7)]. We randomly assigned 32 male Sprague-Dawley rats (body weight 180-200 g) to normoxia control, CIH, Ang(1-7)-treated normoxia, and Ang(1-7)-treated CIH groups. Systolic blood pressure (SBP) was monitored at the start and end of each week. Renal sympathetic nerve activity (RSNA) was recorded. CTGF and TGF-β were detected by immunohistochemistry and western blotting...
January 9, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28076451/survival-benefits-of-interferon-based-therapy-in-patients-with-recurrent-hepatitis-c-after-orthotopic-liver-transplantation
#14
L P Zanaga, A G Vigani, R N Angerami, A Giorgetti, C A F Escanhoela, E C Ataíde, I F S F Boin, R S B Stucchi
Recurrent hepatitis C after orthotopic liver transplantation (OLT) is universal and can lead to graft failure and, consequently, reduced survival. Hepatitis C treatment can be used to prevent these detrimental outcomes. The aim of this study was to describe rates of hepatitis C recurrence and sustained virological response (SVR) to interferon-based treatment after OLT and its relationship to survival and progression of liver disease through retrospective analysis of medical records of 127 patients who underwent OLT due to cirrhosis or hepatocellular carcinoma secondary to chronic hepatitis C between January 2002 and December 2013...
January 9, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28076450/time-course-of-changes-in-heart-rate-and-blood-pressure-variability-in-rats-with-myocardial-infarction
#15
R Aires, E B Pimentel, L Forechi, E M Dantas, J G Mill
Our aim was to determine the time course of changes in autonomic balance in the acute (1 and 3 days), sub-acute (7 days) and chronic (28 days) phases of myocardial infarction (MI) in rats. Autonomic balance was assessed by temporal and spectral analyses of blood pressure variability (BPV) and heart rate variability (HRV). Pulsatile blood pressure (BP) recordings (30 min) were obtained in awake and unrestrained male Wistar rats (N = 77; 8-10 weeks old) with MI (coronary ligature) or sham operation (SO). Data are reported as means±SE...
January 9, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28076456/propofol-inhibits-lung-cancer-cell-viability-and-induces-cell-apoptosis-by-upregulating-microrna-486-expression
#16
N Yang, Y Liang, P Yang, T Yang, L Jiang
Propofol is a frequently used intravenous anesthetic agent. Recent studies show that propofol exerts a number of non-anesthetic effects. The present study aimed to investigate the effects of propofol on lung cancer cell lines H1299 and H1792 and functional role of microRNA (miR)-486 in these effects. H1299 and/or H1792 cells were treated with or without propofol and transfected or not with miR-486 inhibitor, and then cell viability and apoptosis were analyzed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and flow cytometry...
January 5, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28076454/a-broad-ph-range-and-processive-chitinase-from-a-metagenome-library
#17
S S Thimoteo, A Glogauer, H Faoro, E M de Souza, L F Huergo, B M Moerschbacher, F O Pedrosa
Chitinases are hydrolases that degrade chitin, a polymer of N-acetylglucosamine linked β(1-4) present in the exoskeleton of crustaceans, insects, nematodes and fungal cell walls. A metagenome fosmid library from a wastewater-contaminated soil was functionally screened for chitinase activity leading to the isolation and identification of a chitinase gene named metachi18A. The metachi18A gene was subcloned and overexpressed in Escherichia coli BL21 and the MetaChi18A chitinase was purified by affinity chromatography as a 6xHis-tagged fusion protein...
January 5, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28076453/ferulic-acid-lowers-body-weight-and-visceral-fat-accumulation-via-modulation-of-enzymatic-hormonal-and-inflammatory-changes-in-a-mouse-model-of-high-fat-diet-induced-obesity
#18
T S de Melo, P R Lima, K M M B Carvalho, T M Fontenele, F R N Solon, A R Tomé, T L G de Lemos, S G da Cruz Fonseca, F A Santos, V S Rao, M G R de Queiroz
Previous studies have reported on the glucose and lipid-lowering effects of ferulic acid (FA) but its anti-obesity potential has not yet been firmly established. This study investigated the possible anti-obesitogenic effects of FA in mice fed a high-fat diet (HFD) for 15 weeks. To assess the antiobesity potential of FA, 32 male Swiss mice, weighing 20-25 g (n=6-8 per group) were fed a normal diet (ND) or HFD, treated orally or not with either FA (10 mg/kg) or sibutramine (10 mg/kg) for 15 weeks and at the end of this period, the body weights of animals, visceral fat accumulation, plasma levels of glucose and insulin hormone, amylase and lipase activities, the satiety hormones ghrelin and leptin, and tumor necrosis factor-α (TNF-α) and monocyte chemoattractant protein-1 (MCH-1) were analyzed...
January 5, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/27982283/propofol-inhibits-invasion-and-growth-of-ovarian-cancer-cells-via-regulating-mir-9-nf-%C3%AE%C2%BAb-signal
#19
X Huang, Y Teng, H Yang, J Ma
Propofol is one of the most commonly used intravenous anesthetic agents during cancer resection surgery. A previous study has found that propofol can inhibit invasion and induce apoptosis of ovarian cancer cells. However, the underlying mechanisms are not known. miR-9 has been reported to be little expressed in ovarian cancer cells, which has been related to a poor prognosis in patients with ovarian cancer. Studies have also demonstrated that propofol could induce microRNAs expression and suppress NF-κB activation in some situations...
December 12, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/27982281/non-clinical-studies-in-the-process-of-new-drug-development-part-ii-good-laboratory-practice-metabolism-pharmacokinetics-safety-and-dose-translation-to-clinical-studies
#20
E L Andrade, A F Bento, J Cavalli, S K Oliveira, R C Schwanke, J M Siqueira, C S Freitas, R Marcon, J B Calixto
The process of drug development involves non-clinical and clinical studies. Non-clinical studies are conducted using different protocols including animal studies, which mostly follow the Good Laboratory Practice (GLP) regulations. During the early pre-clinical development process, also known as Go/No-Go decision, a drug candidate needs to pass through several steps, such as determination of drug availability (studies on pharmacokinetics), absorption, distribution, metabolism and elimination (ADME) and preliminary studies that aim to investigate the candidate safety including genotoxicity, mutagenicity, safety pharmacology and general toxicology...
December 12, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
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