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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/29590262/pcr-rflp-assay-as-an-option-for-primary-hpv-test
#1
L Golfetto, E V Alves, T R Martins, T C M Sincero, J B S Castro, C Dannebrock, J G Oliveira, J E Levi, A S C Onofre, M L Bazzo
Persistent human papillomavirus (HPV) infection is an essential factor of cervical cancer. This study evaluated the analytical performance of restriction fragment length polymorphism polymerase chain reaction (PCR-RFLP) assay compared to PapilloCheck® microarray to identify human papilloma virus (HPV) in cervical cells. Three hundred and twenty-five women were analyzed. One sample was used for conventional cytology and another sample was collected using BD SurePath™ kit for HPV tests. Eighty samples (24...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590261/performance-during-a-strenuous-swimming-session-is-associated-with-high-blood-lactate-pyruvate-ratio-and-hypoglycemia-in-fasted-rats
#2
P B Travassos, G Godoy, H M De Souza, R Curi, R B Bazotte
The aim of this study was to investigate the effect of lactatemia elevation and glycemia reduction on strenuous swimming performance in fasted rats. Three rats were placed in a swimming tank at the same time. The first rat was removed immediately (control group) and the remaining ones were submitted to a strenuous swimming session. After the second rat was exhausted (Exh group), the third one was immediately removed from the water (Exe group). According to the period of time required for exhaustion, the rats were divided into four groups: low performance (3-7 min), low-intermediary performance (8-12 min), high-intermediary performance (13-17 min), and high performance (18-22 min)...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590260/effect-of-pre-exercise-carbohydrate-availability-on-fat-oxidation-and-energy-expenditure-after-a-high-intensity-exercise
#3
COMPARATIVE STUDY
G A Ferreira, L C Felippe, R L S Silva, R Bertuzzi, F R De Oliveira, F O Pires, A E Lima-Silva
The aim of this study was to test the hypothesis that reduced pre-exercise carbohydrate (CHO) availability potentiates fat oxidation after an exhaustive high-intensity exercise bout. Eight physically active men underwent a high-intensity exercise (∼95% V̇O2max) until exhaustion under low or high pre-exercise CHO availability. The protocol to manipulate pre-exercise CHO availability consisted of a 90-min cycling bout at ∼70% V̇O2max + 6 × 1-min at 125% V̇O2max with 1-min rest, followed by 48 h under a low- (10% CHO, low-CHO availability) or high-CHO diet (80% CHO, high-CHO availability)...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590259/individual-variation-is-the-key-to-the-development-of-a-vaccine-against-staphylococcus-aureus-a-comparative-study-between-mice-lineages
#4
D P Dos Santos, I P R Muniz, A F Queiroz, I S Pereira, M P A Souza, L J Lima, L R O Sousa, I S Ribeiro, M P L Galantini, L M Marques, T B Figueiredo, R A A da Silva
Bacterial infections occur worldwide and are a major public health problem. Among pathogens, Staphylococcus aureus is the main causative agent of bacterial diseases in the world. This study aimed to evaluate which components of the immune system could act protectively against a S. aureus infection in intradermally immunized mice. C57BL/6 and A/j mice were immunized intradermally with S. aureus inactivated by heat and then challenged with viable strains in an air pouch model. At 6, 12, and 24 h after the challenge, euthanasia was performed, and the cellular profile of the inflammatory infiltrate, cytokines, and the bacterial load were evaluated in the air pouch lavages...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590258/human-dental-pulp-stem-cell-adhesion-and-detachment-in-polycaprolactone-electrospun-scaffolds-under-direct-perfusion
#5
A Paim, D I Braghirolli, N S M Cardozo, P Pranke, I C Tessaro
Cell adhesion in three-dimensional scaffolds plays a key role in tissue development. However, stem cell behavior in electrospun scaffolds under perfusion is not fully understood. Thus, an investigation was made on the effect of flow rate and shear stress, adhesion time, and seeding density under direct perfusion in polycaprolactone electrospun scaffolds on human dental pulp stem cell detachment. Polycaprolactone scaffolds were electrospun using a solvent mixture of chloroform and methanol. The viable cell number was determined at each tested condition...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590257/renovascular-hypertension-increases-serum-tnf-and-cx3cl1-in-experimental-trypanosoma-cruzi-infection
#6
M C Silva, M A Azevedo, V P Figueiredo, M R Moura Junior, D Coelho Junior, P M Martinelli, R P Machado, A C Alzamora, A Talvani
Trypanosoma cruzi triggers a progressive inflammatory response affecting cardiovascular functions in humans and experimental models. Angiotensin II, a key effector of the renin-angiotensin system, plays roles in mediating hypertension, heart failure, and inflammatory responses. T. cruzi and AngII can induce inflammatory responses by releasing inflammatory mediators. The aim of this study was to evaluate systemic AngII, tumor necrosis factor (TNF), and CX3CL1 mediators in a two-kidney one-clip (2K1C) renovascular hypertension model using Wistar rats infected with T...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590256/unsteady-walking-as-a-symptom-in-type-2-diabetes-mellitus-independent-association-with-depression-and-sedentary-lifestyle-and-no-association-with-diabetic-neuropathy
#7
L S Dias, O H Nienov, C F Goelzer Neto, H Schmid
The purpose of this study was to look at the determinants of the unsteady walking (UW) symptom in patients with type 2 diabetes mellitus (T2DM) by defining if UW and/or the Diabetic Neuropathy Symptoms Score (DNSS) are associated with positive scores in Beck's Depression Inventory (BDI) and with a positive Michigan Neuropathy Screening Instrument score (MNSI). We evaluated 203 T2DM patients without visible gait disturbances. They were divided into UW (+) and UW (-) or DNSS (+) and DNSS (-) according to symptoms...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590255/use-of-cardiopulmonary-exercise-testing-to-assess-early-ventilatory-changes-related-to-occupational-particulate-matter
#8
T P Chao, E F Sperandio, T L V P Ostolin, V R Almeida, M Romiti, A R T Gagliardi, R L Arantes, V Z Dourado
Spirometry has been used as the main strategy for assessing ventilatory changes related to occupational exposure to particulate matter (OEPM). However, in some cases, as one of its limitations, it may not be sensitive enough to show abnormalities before extensive damage, as seen in restrictive lung diseases. Therefore, we hypothesized that cardiopulmonary exercise testing (CPET) may be better than spirometry to detect early ventilatory impairment caused by OEPM. We selected 135 male workers with at least one year of exposure...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29590254/xanthine-oxidase-activity-in-patients-with-age-related-cataract-associated-with-hypertension
#9
B Kisic, D Miric, L Zoric, J V Rasic, R Grbic, Lj M Popovic, A M Arsic
Reactive oxygen species and lipid peroxidation are important factors that contribute to the development of age-related cataract. The study included 130 patients with age-related cataract, 69 of whom were diagnosed with hypertension (HT), 20 with hypertension and type 2 diabetes mellitus (DM), and 41 had no accompanying condition. The following parameters were measured in the serum of the examinees: products of lipid peroxidation malondialdehyde (MDA) and lipofuscin-like fluorophores (LLF), activity of prooxidative enzymes xanthine oxidase (XO) and myeloperoxidase (MPO), antioxidant enzymes superoxide dismutase (SOD) and glutathione peroxidase (GPx), the concentration of thiol groups, and the ferric reducing activity of plasma...
March 26, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561961/down-regulated-mir-448-relieves-spinal-cord-ischemia-reperfusion-injury-by-up-regulating-sirt1
#10
Yun Wang, Qing-Jiang Pang, Jiang-Tao Liu, Hai-Hao Wu, Dong-Ying Tao
MicroRNAs play a crucial role in the progression of spinal cord ischemia/reperfusion injury (SCII). The role of miR-448 and SIRT1 in SCII was investigated in this study, to provide further insights into prevention and improvement of this disorder. In this study, expressions of miR-448 and SIRT1 protein were determined by qRT-PCR and western blot, respectively. Flow cytometry was used to analyze cell apoptosis. The endogenous expression of genes was modulated by recombinant plasmids and cell transfection. Dual-luciferase reporter assay was performed to determine the interaction between miR-448 and SIRT1...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561960/thyrotropin-and-free-thyroxine-levels-and-coronary-artery-disease-cross-sectional-analysis-of-the-brazilian-longitudinal-study-of-adult-health-elsa-brasil
#11
E J F Peixoto de Miranda, M S Bittencourt, H L Staniak, R Sharovsky, A C Pereira, M Foppa, I S Santos, P A Lotufo, I M Benseñor
Data on the association between subclinical thyroid dysfunction and coronary artery disease (CAD) is scarce. We aimed to analyze the association between thyroid function and CAD using baseline data from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil). We included subjects with normal thyroid function (0.4-4.0 mIU/L, and normal free thyroxine, FT4, or 0.8 to 1.9 ng/dL), subclinical hypothyroidism (SCHypo; TSH>4.0 mIU/L and normal FT4), and subclinical hyperthyroidism (SCHyper; TSH<0.4 mIU/L and normal FT4) evaluated by coronary computed tomography angiography...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561959/single-cell-qpcr-facilitates-the-optimization-of-hematopoietic-differentiation-in-hpscs-op9-coculture-system
#12
Haide Chen, Mengmeng Jiang, Lei Xiao, He Huang
Human pluripotent stem cells (hPSCs)/OP9 coculture system is a widely used hematopoietic differentiation approach. The limited understanding of this process leads to its low efficiency. Thus, we used single-cell qPCR to reveal the gene expression profiles of individual CD34+ cells from different stages of differentiation. According to the dynamic gene expression of hematopoietic transcription factors, we overexpressed specific hematopoietic transcription factors (Gata2, Lmo2, Etv2, ERG, and SCL) at an early stage of hematopoietic differentiation...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561958/maternal-administration-of-cannabidiol-promotes-an-anti-inflammatory-effect-on-the-intestinal-wall-in-a-gastroschisis-rat-model
#13
G H Callejas, R L Figueira, F L L Gonçalves, F A P Volpe, A W Zuardi, J A Crippa, J E Hallak, L Sbragia
Gastroschisis (GS) is an abdominal wall defect that results in histological and morphological changes leading to intestinal motility perturbation and impaired absorption of nutrients. Due to its anti-inflammatory, antioxidant, and neuroprotective effects, cannabidiol (CBD) has been used as a therapeutic agent in many diseases. Our aim was to test the effect of maternal CBD in the intestine of an experimental model of GS. Pregnant rats were treated over 3 days with CBD (30 mg/kg) after the surgical induction of GS (day 18...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561957/threats-to-bioethical-principles-in-medical-practice-in-brazil-new-medical-ethics-code-period
#14
G C L Gracindo, J H da Silva Gallo, R Nunes
We aimed to outline the profile of medical professionals in Brazil who have violated the deontological norms set forth in the ethics code of the profession, and whose cases were judged by the higher tribunal for medical ethics between 2010 and 2016. This survey was conducted using a database formed from professional ethics cases extracted from the plenary of the medical ethics tribunal of the Federal Council of Medicine. These were disciplinary ethics cases that were judged at appeal level between 2010 and 2016...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561956/2-methyl-2-butanol-suppresses-human-retinoblastoma-cells-through-cell-cycle-arrest-and-autophagy
#15
Xiangyun Li, Xiangxiang Zhu, Chong Xu, Jianhua Wu
2-Methyl-2-butanol (MBT) is a chemical compound from the group of alcohols more specifically pentanols, which has shown an excellent anti-cancer activity in our previous study. However, its mechanism of action remains unclear. The present study was designed to investigate the anti-cancer effect of MBT on human retinoblastoma cells. The results showed that the use of MBT leads to HXO-RB44 cell death but is cytotoxic to normal cells at higher concentrations. It showed a dose- as well as a time-dependent inhibition of HXO-RB44 cells...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561955/salvinorin-a-preserves-cerebral-pial-artery-autoregulation-after-forebrain-ischemia-via-the-pi3k-akt-cgmp-pathway
#16
H P Dong, W Zhou, X X Ma, Z Z He, Z H Wang
This study aimed to investigate the protective effect of salvinorin A on the cerebral pial artery after forebrain ischemia and explore related mechanisms. Thirty Sprague-Dawley rats received forebrain ischemia for 10 min. The dilation responses of the cerebral pial artery to hypercapnia and hypotension were assessed in rats before and 1 h after ischemia. The ischemia reperfusion (IR) control group received DMSO (1 µL/kg) immediately after ischemia. Two different doses of salvinorin A (10 and 20 µg/kg) were administered following the onset of reperfusion...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561954/nitric-oxide-modulates-atp-evoked-currents-in-mouse-leydig-cells
#17
J L de Deus, A L A Dagostin, W A Varanda
Testosterone synthesis within Leydig cells is a calcium-dependent process. Intracellular calcium levels are regulated by different processes including ATP-activated P2X purinergic receptors, T-type Ca2+ channels modulated by the luteinizing hormone, and intracellular calcium storages recruited by a calcium-induced calcium release mechanism. On the other hand, nitric oxide (NO) is reported to have an inhibitory role in testosterone production. Based on these observations, we investigated the interaction between the purinergic and nitrergic systems in Leydig cells of adult mice...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561953/heterozygous-htra1-missense-mutation-in-cadasil-like-family-disease
#18
Xiaowei Wu, Changxin Li, Jinming Mao, Ling Li, Yan Liu, Yao Hou
The aim of this study was to find related pathogenic genes in cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy in (CADASIL)-like patients. The direct sequencing and high-throughput multiplex polymerase chain reaction (PCR) was performed to screen for related genes. The clinical and imaging data of a CADASIL-like patient (the pro-band) and his family members were collected. At first, the known hereditary cerebral vascular genes of the pro-band were screened with direct sequencing to find candidate gene mutations...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29561952/homology-modeling-and-epitope-prediction-of-der-f-33
#19
Feixiang Teng, Jinxia Sun, Lili Yu, Qisong Li, Yubao Cui
Dermatophagoides farinae (Der f), one of the main species of house dust mites, produces more than 30 allergens. A recently identified allergen belonging to the alpha-tubulin protein family, Der f 33, has not been characterized in detail. In this study, we used bioinformatics tools to construct the secondary and tertiary structures and predict the B and T cell epitopes of Der f 33. First, protein attribution, protein patterns, and physicochemical properties were predicted. Then, a reasonable tertiary structure was constructed by homology modeling...
March 15, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29513881/identification-of-a-novel-umod-mutation-c-163g-a-in-a-brazilian-family-with-autosomal-dominant-tubulointerstitial-kidney-disease
#20
L B Lopes, C C Abreu, C F Souza, L E R Guimaraes, A A Silva, F Aguiar-Alves, K O Kidd, S Kmoch, A J Bleyer, J R Almeida
Autosomal dominant tubulointerstitial kidney disease (ADTKD) is characterized by autosomal dominant inheritance, progressive chronic kidney disease, and a bland urinary sediment. ADTKD is most commonly caused by mutations in the UMOD gene encoding uromodulin (ADTKD-UMOD). We herein report the first confirmed case of a multi-generational Brazilian family with ADTKD-UMOD, caused by a novel heterozygous mutation (c.163G>A, GGC→AGC, p.Gly55Ser) in the UMOD gene. Of 41 family members, 22 underwent genetic analysis, with 11 individuals found to have this mutation...
March 1, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
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