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1.
Artigo em Inglês | MEDLINE | ID: mdl-38785276

RESUMO

OBJECTIVES: Cushing's disease (CD) is a diagnostic and therapeutic challenge, especially in pediatric patients. CD, primarily caused by adrenocorticotropic hormone-secreting pituitary adenomas, manifests typically with growth retardation and weight gain. There are no published guidelines for pediatric patients. CASE PRESENTATION: We report three pediatric patients diagnosed with CD in a Portuguese tertiary hospital. All patients presented with hypercortisolism features. All patients underwent transsphenoidal pituitary surgery (TSS) as a first-choice treatment; however, it was unsuccessful in one patient and the other patients experienced recurrence. Patients were submitted to different approaches so basal serum cortisol levels could be achieved. Two of three patients achieved remission. CONCLUSIONS: TSS remains the first-line treatment yet challenging due to microadenomas and technical complexities. Medical therapy with agents like metyrapone or ketoconazole, pituitary radiotherapy, or bilateral adrenalectomy are, usually, second-line interventions, unless there is a contraindication to surgery. Our findings support the finding that a shorter hypothalamic-pituitary-adrenal axis recovery time increases the risk of recurrence of CD. Our cases illustrate the intricate management and variable outcomes of pediatric CD, underscoring the importance of multidisciplinary care and continuous surveillance.

2.
Imaging Sci Dent ; 54(1): 13-24, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38571780

RESUMO

Purpose: Pycnodysostosis (PYCD), an autosomal recessive syndrome, is characterized by an imbalance in bone remodeling that produces various clinical and radiographic craniofacial manifestations. This review represents a systematic examination of these manifestations, as well as oral features associated with PYCD. Materials and Methods: A systematic review was conducted across 8 databases from February to March 2023. The search strategy focused on studies reporting cases of PYCD that examined the clinical and radiographic craniofacial and oral characteristics associated with this syndrome. Results: The review included 84 studies, encompassing a total of 179 cases of PYCD. More than half of the patients were female (55.3%), and the mean age was 14.7 years. Parental consanguinity was reported in 51.4% of the cases. The most common craniofacial clinical manifestation was a prominent nose, observed in 57.5% of cases. Radiographically, the most frequently reported craniofacial characteristics included the presence of an obtuse mandibular angle (84.3%) and frontal cranial bosses (82.1%). Clinical and radiographic examinations revealed oral alterations, with micrognathia present in 62.6% of patients and malocclusion in 59.2%. Among dental anomalies, tooth agenesis was the most commonly reported, affecting 15.6% of patients. Conclusion: Understanding the clinical and radiographic craniofacial features of PYCD is crucial for dental professionals. This knowledge enables these clinicians to devise effective treatment plans and improve patient quality of life.

3.
Ecology ; 105(5): e4298, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38610092

RESUMO

Camera traps became the main observational method of a myriad of species over large areas. Data sets from camera traps can be used to describe the patterns and monitor the occupancy, abundance, and richness of wildlife, essential information for conservation in times of rapid climate and land-cover changes. Habitat loss and poaching are responsible for historical population losses of mammals in the Atlantic Forest biodiversity hotspot, especially for medium to large-sized species. Here we present a data set from camera trap surveys of medium to large-sized native mammals (>1 kg) across the Atlantic Forest. We compiled data from 5380 ground-level camera trap deployments in 3046 locations, from 2004 to 2020, resulting in 43,068 records of 58 species. These data add to existing data sets of mammals in the Atlantic Forest by including dates of camera operation needed for analyses dealing with imperfect detection. We also included, when available, information on important predictors of detection, namely the camera brand and model, use of bait, and obstruction of camera viewshed that can be measured from example pictures at each camera location. Besides its application in studies on the patterns and mechanisms behind occupancy, relative abundance, richness, and detection, the data set presented here can be used to study species' daily activity patterns, activity levels, and spatiotemporal interactions between species. Moreover, data can be used combined with other data sources in the multiple and expanding uses of integrated population modeling. An R script is available to view summaries of the data set. We expect that this data set will be used to advance the knowledge of mammal assemblages and to inform evidence-based solutions for the conservation of the Atlantic Forest. The data are not copyright restricted; please cite this paper when using the data.


As armadilhas fotográficas tornaram­se o principal método de observação de muitas espécies em grandes áreas. Os dados obtidos com armadilhas fotográficas podem ser usados para descrever os padrões e monitorar a ocupação, abundância e riqueza da vida selvagem, informação essencial para a conservação em tempos de rápidas mudanças climáticas e de cobertura do solo. A perda de habitat e a caça furtiva são responsáveis pelas perdas populacionais históricas de mamíferos no hotspot de biodiversidade da Mata Atlântica, especialmente para espécies de médio e grande porte. Aqui apresentamos um conjunto de dados de levantamentos com armadilhas fotográficas de mamíferos de médio e grande porte (>1 kg) em toda a Mata Atlântica. Compilamos dados de 5.380 armadilhas fotográficas instaladas no nível do chão em 3.046 locais, de 2004 a 2020, resultando em 43.068 registros de 58 espécies. Esses dados acrescentam aos conjuntos de dados existentes de mamíferos na Mata Atlântica por incluir as datas de operação das câmeras, que são necessárias para análises que lidam com detecção imperfeita. Também incluímos, quando disponíveis, informações sobre importantes preditores de detecção, como marca e modelo da câmera, uso de isca e obstrução do visor da câmera que pode ser medido a partir de imagens de exemplo em cada local da câmera. Além de estudos sobre os padrões e mecanismos por trás da ocupação, abundância relativa, riqueza e detecção, o conjunto de dados aqui apresentado pode ser usado para estudar os padrões de atividade diária das espécies, nível de atividade e interações espaço­temporais entre as espécies. Além disso, os dados podem ser usados em combinação com outras fontes de dados em diversas análises com modelagem populacional integrada. Um script R está disponível para visualizar um resumo do conjunto de dados. Esperamos que este conjunto de dados seja usado para aumentar o conhecimento sobre as assembleias de mamíferos e usado para informar soluções baseadas em evidências para a conservação da Mata Atlântica. Os dados não são restritos por direitos autorais e, por favor, cite este documento ao usar os dados.


Assuntos
Florestas , Mamíferos , Mamíferos/fisiologia , Animais , Fotografação , Biodiversidade , Conservação dos Recursos Naturais/métodos
4.
Proc Biol Sci ; 291(2020): 20232617, 2024 Apr 10.
Artigo em Inglês | MEDLINE | ID: mdl-38593844

RESUMO

When populations repeatedly adapt to similar environments they can evolve similar phenotypes based on shared genetic mechanisms (parallel evolution). The likelihood of parallel evolution is affected by demographic history, as it depends on the standing genetic variation of the source population. The three-spined stickleback (Gasterosteus aculeatus) repeatedly colonized and adapted to brackish and freshwater. Most parallel evolution studies in G. aculeatus were conducted at high latitudes, where freshwater populations maintain connectivity to the source marine populations. Here, we analysed southern and northern European marine and freshwater populations to test two hypotheses. First, that southern European freshwater populations (which currently lack connection to marine populations) lost genetic diversity due to bottlenecks and inbreeding compared to their northern counterparts. Second, that the degree of genetic parallelism is higher among northern than southern European freshwater populations, as the latter have been subjected to strong drift due to isolation. The results show that southern populations exhibit lower genetic diversity but a higher degree of genetic parallelism than northern populations. Hence, they confirm the hypothesis that southern populations have lost genetic diversity, but this loss probably happened after they had already adapted to freshwater conditions, explaining the high degree of genetic parallelism in the south.


Assuntos
Água Doce , Smegmamorpha , Animais , Smegmamorpha/genética , Endogamia , Variação Genética
5.
Oral Dis ; 2024 Jan 31.
Artigo em Inglês | MEDLINE | ID: mdl-38297810

RESUMO

OBJECTIVE: To analyze the immunohistochemical expression of YAP and its correlation with markers involved in cell proliferation and apoptosis in benign epithelial odontogenic lesions. STUDY DESIGN: The sample consisted of 95 cases of odontogenic lesions (25 dentigerous cysts, 30 non-syndromic odontogenic keratocysts, 30 conventional ameloblastomas, and 10 unicystic ameloblastomas) and 10 dental follicles used as normal odontogenic tissue. The histological sections were submitted to immunohistochemistry with YAP, cyclin D1, Ki-67, and Bcl-2 antibodies. Immunoexpression was analyzed qualitatively and quantitatively using an adapted method. The collected data were analyzed descriptively and statistically (p ≤ 0.05). RESULTS: The highest YAP expression was observed in odontogenic keratocysts, followed by unicystic ameloblastomas and conventional ameloblastomas, which exhibited moderate immunoreactivity predominantly in peripheral cells. Furthermore, significant differences in YAP immunoexpression were observed between the groups analyzed, with significant positive correlations between YAP and cyclin D1 in dentigerous cysts and unicystic ameloblastomas and between YAP and Ki-67 in unicystic ameloblastomas (p < 0.05). However, there were no statistically significant correlations between YAP and Bcl-2 immunoexpression in the groups studied. CONCLUSION: YAP may influence epithelial cell proliferation in odontogenic cysts and tumors, suggesting its possible participation in the progression of the odontogenic lesions studied.

6.
Nanotoxicology ; 17(6-7): 511-528, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37855675

RESUMO

The hazard posed to human health by inhaled amorphous silica nanomaterials (aSiO2 NM) remains uncertain. Herein, we assessed the cyto- and genotoxicity of aSiO2 NM variants covering different sizes (7, 15, and 40 nm) and surface modifications (unmodified, phosphonate-, amino- and trimethylsilyl-modified) on rat alveolar epithelial (RLE-6TN) cells. Cytotoxicity was evaluated at 24 h after exposure to the aSiO2 NM variants by the lactate dehydrogenase (LDH) release and WST-1 reduction assays, while genotoxicity was assessed using different endpoints: DNA damage (single- and double-strand breaks [SSB and DSB]) by the comet assay for all aSiO2 NM variants; cell cycle progression and γ-H2AX levels (DSB) by flow cytometry for those variants that presented higher cytotoxic and DNA damaging potential. The variants with higher surface area demonstrated a higher cytotoxic potential (SiO2_7, SiO2_15_Unmod, SiO2_15_Amino, and SiO2_15_Phospho). SiO2_40 was the only variant that induced significant DNA damage on RLE-6TN cells. On the other hand, all tested variants (SiO2_7, SiO2_15_Unmod, SiO2_15_Amino, and SiO2_40) significantly increased total γ-H2AX levels. At high concentrations (28 µg/cm2), a decrease in G0/G1 subpopulation was accompanied by a significant increase in S and G2/M sub-populations after exposure to all tested materials except for SiO2_40 which did not affect cell cycle progression. Based on the obtained data, the tested variants can be ranked for its genotoxic DNA damage potential as follows: SiO2_7 = SiO2_40 = SiO2_15_Unmod > SiO2_15_Amino. Our study supports the usefulness of multiparametric approaches to improve the understanding on NM mechanisms of action and hazard prediction.


Assuntos
Células Epiteliais Alveolares , Nanoestruturas , Ratos , Humanos , Animais , Dióxido de Silício/toxicidade , Dano ao DNA , Ensaio Cometa , Nanoestruturas/toxicidade
7.
Head Neck Pathol ; 17(3): 688-696, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37540485

RESUMO

BACKGROUND: Recently, a new odontogenic tumor has been described, the so-called adenoid ameloblastoma (AdAM). The aim of this review was to determine the clinical and imaging features of AdAM and to describe its main histopathological findings. METHODS: The systematic review included published cases with a diagnosis of AdAM in the gnathic bones, which had sufficient clinical, imaging, and histopathological data to confirm its diagnosis. The following histopathological diagnostic criteria were adopted: presence of ameloblastoma-like components, duct-like structures, spiral cellular condensations, and a cribriform architecture. RESULTS: Fifteen articles, corresponding to 30 cases of AdAM, were selected. Most cases affected men (63.3%), with a slight preference for the mandible (16:14) and the posterior region of gnathic bones was the most commonly affected site. The mean age at diagnosis was 40.8 years. Clinically, the lesions usually presented as a swelling (53.3%) and, radiographically, as a well-defined radiolucency (33.4%). Surgical resection (40%) was the most frequently adopted treatment and recurrence occurred in 30% of cases. Microscopic examination showed cribriform areas in most AdAM cases (93.3%); duct-like structures and spiral cellular condensations were seen in 100% of the cases. CONCLUSION: The small number of reported cases, the existence of erroneous diagnoses, and the adoption of initial conservative management make it difficult to determine whether AdAM has a higher risk of recurrence or more aggressive biological behavior than conventional ameloblastomas.


Assuntos
Tonsila Faríngea , Ameloblastoma , Tumores Odontogênicos , Masculino , Humanos , Adulto , Ameloblastoma/patologia , Tonsila Faríngea/patologia , Mandíbula/patologia , Tumores Odontogênicos/patologia
8.
Int J Mol Sci ; 24(14)2023 Jul 21.
Artigo em Inglês | MEDLINE | ID: mdl-37511482

RESUMO

Nanotechnology and the incorporation of nanomaterials (NM) into everyday products help to solve problems in society and improve the quality of life, allowing for major advances in the technological, industrial, and medical fields [...].


Assuntos
Nanoestruturas , Qualidade de Vida , Humanos , Nanoestruturas/toxicidade , Nanotecnologia
10.
Rev Gaucha Enferm ; 44: e20220098, 2023.
Artigo em Inglês, Português | MEDLINE | ID: mdl-37436219

RESUMO

OBJECTIVE: To analyze the incidence of malaria among indigenous people associated with the presence of artisanal miningin the state of Pará. METHOD: Analytical, cross-sectional study conducted with 20,774 cases of malaria in indigenous people in the state of Pará (2011 to 2020). The data came from the Malaria Epidemiological Surveillance Information System, obtained from the Pará State Department of Public Health. In the analysis, Spearman's correlation coefficient was used, with a significance of 5% (p < 0.05). RESULTS: Incidence rates were high, especially in the Tapajós River Indigenous Special Health District (372.2/1,000 inhabitants). There was association between the incidence of malaria and the presence of indigenous people in artisanalmining activities on the Tapajós River (p=0.0008). CONCLUSION: The occurrence of malaria is unequal among the Special Indigenous Health Districts, being more frequent in those with greater mining activity, configuring exposure to the disease. It is necessary to adopt intersectoral measures, especially in areas of vulnerability to illness.


Assuntos
Malária , Humanos , Incidência , Estudos Transversais , Malária/epidemiologia , Povos Indígenas
11.
Nursing (Ed. bras., Impr.) ; 26(301): 9701-9711, jul.2023.
Artigo em Inglês, Português | LILACS, BDENF - Enfermagem | ID: biblio-1451207

RESUMO

Objetivo: Perceber quais as alterações que ocorreram na abordagem à pessoa em situação crítica no Serviço de Urgência e Unidade de Cuidados Intensivos após início da pandemia COVID-19. Método: A estratégia de pesquisa para a scopingreview foi realizada nas bases de dados Medline via PubMed, EBSCO Host, BioMed Central, ScienceDirect, BVS e Scielo através da utilização de descritores MeSH e DeCS, artigos com fulltext gratuito, publicados em língua portuguesa, inglesa e espanhola, com datas de publicação entre 2019 e 2021, implementados critérios de inclusão e exclusão.Resultados: Foram identificados 4 estudos elegíveis para análise, publicados em 2020, nenhum dos estudos em Português. Conclusão: As principais alterações estão relacionadas com a utilização de equipamento de proteção individual, colocando o enfoque na segurança dos profissionais de saúde.(AU)


Aim: To understand the changes that occurred in the approach to critically ill patients in the Emergency Department and Intensive Care Unit after the beginning of the COVID-19 pandemic. Method: The search strategy for the scoping review was conducted in Medline databases via PubMed, EBSCO Host, BioMed Central, ScienceDirect, BVS and Scielo by using MeSH and DeCS descriptors, articles with free full text, published in Portuguese, English and Spanish language, with publication dates between 2019 and 2021, implemented inclusion and exclusion criteria.Results: Four eligible studies were identified for analysis, published in 2020, and none of the studies was in Portuguese. Conclusion: The main changes are related to the use of personal protective equipment, focusing on the safety of health professionals.(AU)


Objetivo: Conocer qué cambios se han producido en el abordaje a los pacientes críticos en el Servicio de Urgencia y enUnidades de Cuidados Intensivos tras el inicio de la pandemia COVID-19.Método: La estrategia de búsqueda para la revisión se realizó en las bases de datos Medline e PubMed, EBSCO Host, BioMed Central, ScienceDirect, BVS y Scielo con el uso de descriptores MeSH y DeCS, artículos con libre acceso a texto completo, publicados en portugués, inglés y español, entre el 2019 y 2021, usando criterios de inclusión y exclusión.Resultados: Identificamos 4 estudios elegibles para el análisis, todos publicados en 2020, e ninguno en portugués.Conclusión: Los principales cambios están relacionados con el uso de equipamientos de protección personal, conel enfoque en la seguridad de los profesionales de salud.(AU)


Assuntos
Pessoas Mal Alojadas , Socorro de Urgência , COVID-19 , Unidades de Terapia Intensiva , Pessoas
12.
Artigo em Inglês | IBECS | ID: ibc-222294

RESUMO

Background: Squamous cell carcinoma (SCC) is the most common head and neck malignant neoplasm. Despite progress in antineoplastic treatment for SCC, there are still high morbidity and mortality rates. Over the years, several tumor biomarkers have been suggested to predict the prognosis of patients with oral SCC. Studies point to a bidirectional association between the epithelial-mesenchymal transition (EMT) and the expression of PD-L1 with the aggressive biological behavior of the neoplastic cell. Thus, this systematic review aimed to explore the biological roles and mechanisms underlying the interaction between EMT and PD-L1 expression in head and neck SCC-derived cell lines. Material and methods: An electronic search was performed in the PubMed/Medline, Web of Science, Science Direct, Scopus, Embase, and Cochrane Collaboration Library databases. Articles evaluating the in vitro relationship between EMT/PD-L1 interaction and the biological behavior of head and neck SCC cell lines were selected for this systematic review. The quality of evidence was assessed using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) criteria. Results: After applying the previously established inclusion/exclusion criteria, 9 articles were included in the qualitative synthesis. The present systematic review suggests the existence of a bidirectional interaction between EMT and PD-L1 expression, which is related to alterations in the cell cycle, proliferation, apoptosis, and cell survival, affecting the migration and invasion ability of tumor cells. Conclusions: Combined targeting of the two pathways may be potentially effective for immunotherapy in head and neck SCC. (AU)


Assuntos
Humanos , Carcinoma de Células Escamosas de Cabeça e Pescoço , Transição Epitelial-Mesenquimal , Antígeno B7-H1 , Linhagem Celular
13.
Mutagenesis ; 38(5): 273-282, 2023 10 14.
Artigo em Inglês | MEDLINE | ID: mdl-37357800

RESUMO

The comet assay is widely used in biomonitoring studies for the analysis of DNA damage in leukocytes and peripheral blood mononuclear cells. Rather than processing blood samples directly, it can be desirable to cryopreserve whole blood or isolated cells for later analysis by the comet assay. However, this creates concern about artificial accumulation of DNA damage during cryopreservation. In this study, 10 laboratories used standardized cryopreservation and thawing procedures of monocytic (THP-1) or lymphocytic (TK6) cells. Samples were cryopreserved in small aliquots in 50% foetal bovine serum, 40% cell culture medium, and 10% dimethyl sulphoxide. Subsequently, cryopreserved samples were analysed by the standard comet assay on three occasions over a 3-year period. Levels of DNA strand breaks in THP-1 cells were increased (four laboratories), unaltered (four laboratories), or decreased (two laboratories) by long-term storage. Pooled analysis indicates only a modest positive association between storage time and levels of DNA strand breaks in THP-1 cells (0.37% Tail DNA per year, 95% confidence interval: -0.05, 0.78). In contrast, DNA strand break levels were not increased by cryopreservation in TK6 cells. There was inter-laboratory variation in levels of DNA strand breaks in THP-1 cells (SD = 3.7% Tail DNA) and TK6 reference sample cells (SD = 9.4% Tail DNA), whereas the intra-laboratory residual variation was substantially smaller (i.e. SD = 0.4%-2.2% Tail DNA in laboratories with the smallest and largest variation). In conclusion, the study shows that accumulation of DNA strand breaks in cryopreserved mononuclear blood cell lines is not a matter of concern.


Assuntos
Dano ao DNA , Leucócitos Mononucleares , Ensaio Cometa/métodos , Leucócitos Mononucleares/metabolismo , Criopreservação/métodos , DNA/metabolismo
14.
Mutagenesis ; 38(5): 264-272, 2023 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-37357815

RESUMO

The formamidopyrimidine DNA glycosylase (Fpg)-modified comet assay is widely used for the measurement of oxidatively generated damage to DNA. However, there has not been a recommended long-term positive control for this version of the comet assay. We have investigated potassium bromate as a positive control for the Fpg-modified comet assay because it generates many Fpg-sensitive sites with a little concurrent generation of DNA strand breaks. Eight laboratories used the same procedure for the treatment of monocytic THP-1 cells with potassium bromate (0, 0.5, 1.5, and 4.5 mM) and subsequent cryopreservation in a freezing medium consisting of 50% foetal bovine serum, 40% RPMI-1640 medium, and 10% dimethyl sulphoxide. The samples were analysed by the Fpg-modified comet assay three times over a 3-year period. All laboratories obtained a positive concentration-response relationship in cryopreserved samples (linear regression coefficients ranging from 0.79 to 0.99). However, there was a wide difference in the levels of Fpg-sensitive sites between the laboratory with the lowest (4.2% Tail DNA) and highest (74% Tail DNA) values in THP-1 cells after exposure to 4.5 mM KBrO3. In an attempt to assess sources of inter-laboratory variation in Fpg-sensitive sites, comet images from one experiment in each laboratory were forwarded to a central laboratory for visual scoring. There was high consistency between measurements of %Tail DNA values in each laboratory and the visual score of the same comets done in the central laboratory (r = 0.98, P < 0.001, linear regression). In conclusion, the results show that potassium bromate is a suitable positive comet assay control.

15.
Front Toxicol ; 5: 1116707, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37342468

RESUMO

The environmental impact on health is an inevitable by-product of human activity. Environmental health sciences is a multidisciplinary field addressing complex issues on how people are exposed to hazardous chemicals that can potentially affect adversely the health of present and future generations. Exposure sciences and environmental epidemiology are becoming increasingly data-driven and their efficiency and effectiveness can significantly improve by implementing the FAIR (findable, accessible, interoperable, reusable) principles for scientific data management and stewardship. This will enable data integration, interoperability and (re)use while also facilitating the use of new and powerful analytical tools such as artificial intelligence and machine learning in the benefit of public health policy, and research, development and innovation (RDI). Early research planning is critical to ensuring data is FAIR at the outset. This entails a well-informed and planned strategy concerning the identification of appropriate data and metadata to be gathered, along with established procedures for their collection, documentation, and management. Furthermore, suitable approaches must be implemented to evaluate and ensure the quality of the data. Therefore, the 'Europe Regional Chapter of the International Society of Exposure Science' (ISES Europe) human biomonitoring working group (ISES Europe HBM WG) proposes the development of a FAIR Environment and health registry (FAIREHR) (hereafter FAIREHR). FAIR Environment and health registry offers preregistration of studies on exposure sciences and environmental epidemiology using HBM (as a starting point) across all areas of environmental and occupational health globally. The registry is proposed to receive a dedicated web-based interface, to be electronically searchable and to be available to all relevant data providers, users and stakeholders. Planned Human biomonitoring studies would ideally be registered before formal recruitment of study participants. The resulting FAIREHR would contain public records of metadata such as study design, data management, an audit trail of major changes to planned methods, details of when the study will be completed, and links to resulting publications and data repositories when provided by the authors. The FAIREHR would function as an integrated platform designed to cater to the needs of scientists, companies, publishers, and policymakers by providing user-friendly features. The implementation of FAIREHR is expected to yield significant benefits in terms of enabling more effective utilization of human biomonitoring (HBM) data.

16.
Mutagenesis ; 38(5): 253-263, 2023 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-37233347

RESUMO

Measurement of DNA migration in the comet assay can be done by image analysis or visual scoring. The latter accounts for 20%-25% of the published comet assay results. Here we assess the intra- and inter-investigator variability in visual scoring of comets. We include three training sets of comet images, which can be used as reference for researchers who wish to use visual scoring of comets. Investigators in 11 different laboratories scored the comet images using a five-class scoring system. There is inter-investigator variation in the three training sets of comets (i.e. coefficient of variation (CV) = 9.7%, 19.8%, and 15.2% in training sets I-III, respectively). However, there is also a positive correlation of inter-investigator scoring in the three training sets (r = 0.60). Overall, 36% of the variation is attributed to inter-investigator variation and 64% stems from intra-investigator variation in scoring between comets (i.e. the comets in training sets I-III look slightly different and this gives rise to heterogeneity in scoring). Intra-investigator variation in scoring was also assessed by repeated analysis of the training sets by the same investigator. There was larger variation when the training sets were scored over a period of six months (CV = 5.9%-9.6%) as compared to 1 week (CV = 1.3%-6.1%). A subsequent study revealed a high inter-investigator variation when premade slides, prepared in a central laboratory, were stained and scored by investigators in different laboratories (CV = 105% and 18%-20% in premade slides with comets from unexposed and hydrogen peroxide-exposed cells, respectively). The results indicate that further standardization of visual scoring is desirable. Nevertheless, the analysis demonstrates that visual scoring is a reliable way of analysing DNA migration in comets.

17.
Mutagenesis ; 38(5): 283-294, 2023 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-37228081

RESUMO

The comet assay is a simple and versatile method for measurement of DNA damage in eukaryotic cells. More specifically, the assay detects DNA migration from agarose gel-embedded nucleoids, which depends on assay conditions and the level of DNA damage. Certain steps in the comet assay procedure have substantial impact on the magnitude of DNA migration (e.g. electric potential and time of electrophoresis). Inter-laboratory variation in DNA migration levels occurs because there is no agreement on optimal assay conditions or suitable assay controls. The purpose of the hCOMET ring trial was to test potassium bromate (KBrO3) as a positive control for the formamidopyrimidine DNA glycosylase (Fpg)-modified comet assay. To this end, participating laboratories used semi-standardized protocols for cell culture (i.e. cell culture, KBrO3 exposure, and cryopreservation of cells) and comet assay procedures, whereas the data acquisition was not standardized (i.e. staining of comets and image analysis). Segregation of the total variation into partial standard deviation (SD) in % Tail DNA units indicates the importance of cell culture procedures (SD = 10.9), comet assay procedures (SD = 12.3), staining (SD = 7.9) and image analysis (SD = 0.5) on the overall inter-laboratory variation of DNA migration (SD = 18.2). Future studies should assess sources of variation in each of these steps. On the positive side, the hCOMET ring trial demonstrates that KBrO3 is a robust positive control for the Fpg-modified comet assay. In conclusion, the hCOMET ring trial has demonstrated a high reproducibility of detecting genotoxic effects by the comet assay, but inter-laboratory variation of DNA migration levels is a concern.

18.
Mar Drugs ; 21(3)2023 Mar 04.
Artigo em Inglês | MEDLINE | ID: mdl-36976215

RESUMO

Triple-negative breast cancer (TNBC) represents an aggressive subtype of breast cancer (BC) with a typically poorer prognosis than other subtypes of BC and limited therapeutic options. Therefore, new drugs would be particularly welcome to help treat TNBC. Preussin, isolated from the marine sponge-associated fungus, Aspergillus candidus, has shown the potential to reduce cell viability and proliferation as well as to induce cell death and cell cycle arrest in 2D cell culture models. However, studies that better mimic the tumors in vivo, such as 3D cell cultures, are needed. Here, we studied the effects of preussin in the MDA-MB-231 cell line, comparing 2D and 3D cell cultures, using ultrastructural analysis and the MTT, BrdU, annexin V-PI, comet (alkaline and FPG modified versions), and wound healing assays. Preussin was found to decrease cell viability, both in 2D and 3D cell cultures, in a dose-dependent manner, impair cell proliferation, and induce cell death, therefore excluding the hypothesis of genotoxic properties. The cellular impacts were reflected by ultrastructural alterations in both cell culture models. Preussin also significantly inhibited the migration of MDA-MB-231 cells. The new data expanded the knowledge on preussin actions while supporting other studies, highlighting its potential as a molecule or scaffold for the development of new anticancer drugs against TNBC.


Assuntos
Neoplasias de Mama Triplo Negativas , Humanos , Neoplasias de Mama Triplo Negativas/patologia , Linhagem Celular Tumoral , Células MDA-MB-231 , Anisomicina , Proliferação de Células
19.
Enferm. foco (Brasília) ; 14: 1-7, mar. 20, 2023.
Artigo em Português | LILACS, BDENF - Enfermagem | ID: biblio-1525068

RESUMO

Objetivo: analisar as percepções de enfermeiras sobre a Monitorização Residencial da Pressão Arterial no contexto da Atenção Primária à Saúde. Métodos: estudo descritivo, qualitativo, realizado em sete Unidades de Saúde da Família de Belém, Pará, com participação de 14 enfermeiras, que atuavam no Programa HiperDia. A coleta de dados ocorreu nos meses de janeiro a março de 2017, por meio de entrevistas semiestruturadas individuais, empregando roteiro elaborado pelos pesquisadores. As entrevistas foram gravadas, transcritas e submetidas à técnica de análise de conteúdo. Resultados: emergiram quatro categorias temáticas, abordando os conhecimentos sobre a Monitorização Residencial da Pressão Arterial, as práticas e estratégias no manejo da pessoa com hipertensão, a importância da monitorização, os recursos e métodos para o diagnóstico da doença e as dificuldades na execução dessa monitorização. Conclusão: as enfermeiras reconheceram a importância da Monitorização Residencial da Pressão Arterial nas ações empreendidas por suas equipes, destacando a aplicação desse método na prevenção de complicações da hipertensão. Todavia, ressaltaram que a efetividade perpassa pelo uso de aparelho adequado, não disponível nos serviços. (AU)


Objective: to analyze nurses' perceptions about Home Blood Pressure Monitoring in the context of Primary Health Care. Methods: a descriptive, qualitative study, carried out in seven Family Health Care Units in Belém, Pará, in which 14 nurses, who worked in the HiperDia Program participated. Data collection was conducted from January to March 2017, through individual semi-structured interviews, using a script prepared by the researchers. The interviews were recorded, transcribed, and submitted to content analysis technical procedures. Results: four thematic categories emerged, addressing knowledge about Home Blood Pressure Monitoring, the proceedings, and strategies in the management of people with hypertension, the importance of monitoring, the resources and methods for diagnosing the disease, and the difficulties in carrying out this monitoring. Conclusion: the nurses acknowledged the relevance of Home Blood Pressure Monitoring in the actions carried out by their teams, highlighting the use of this method in preventing complications of hypertension. However, they emphasized that effectiveness involves the use of an adequate device, which is not available in the services. (AU)


Objetivo: analizar las percepciones de las enfermeras sobre el Monitoreo Domiciliario de la Presión Arterial en el contexto de la Atención Primaria de Salud. Métodos: estudio descriptivo y cualitativo realizado en siete Unidades de Salud Familiar en Belém, Pará, con la participación de 14 enfermeras que trabajaron en el Programa HiperDia. La recopilación de datos tuvo lugar entre enero y marzo de 2017, mediante entrevistas individuales semiestructuradas, utilizando un guion preparado por los investigadores. Las entrevistas fueron grabadas, transcritas y sometidas a la técnica de análisis de contenido. Resultados: surgieron cuatro categorías temáticas, abordando el conocimiento sobre el control de la presión arterial en el domicilio, las prácticas y estrategias en el manejo de la persona con hipertensión, la importancia del monitoreo, los recursos y métodos para el diagnóstico de la enfermedad y las dificultades para realizar este monitoreo. Conclusión: las enfermeras reconocen la importancia del Monitoreo Domiciliario de la Presión Arterial en las acciones llevadas a cabo por sus equipos, subrayando la aplicación de este método en la prevención de las complicaciones de la hipertensión. No obstante, resaltaron que la eficacia requiere el uso de aparatos adecuados, que no están disponibles en los servicios. (AU)


Assuntos
Hipertensão , Atenção Primária à Saúde , Estratégias de Saúde Nacionais , Monitoramento Ambiental , Cuidados de Enfermagem
20.
BMC Endocr Disord ; 23(1): 30, 2023 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-36732722

RESUMO

PURPOSE: Metabolic syndrome is a risk factor for several diseases. The relationship between metabolic syndrome and hypogonadism is well known. Our objetive is to assess whether a low carbohydrate diet can increase total serum testosterone and improve erectile function in hypogonadal men with metabolic syndrome. METHODS: An open label randomized clinical trial was conducted comparing a low carbohydrate diet and controls, during three months, in hypogonadal men with metabolic syndrome. Anthropometric measurements were evaluated as well as total serum testosterone levels, and symptoms of hypogonadism, using the ADAM and AMS scores, and sexual function using IIEF-5 score. RESULTS: Eighteen men were evaluated. Anthropometric measures were improved only in low carbohydrate diet group. The intervention group also had a statistically increase in IIEF-5 score and a significant reduction in AMS and ADAM scores (p < 0.001). The increase in serum total testosterone levels was statistically significant in the low carbohydrate group compared to the control group as well as calculated free testosterone (p < 0.001). CONCLUSIONS: Low carbohydrate diet may increase serum levels of testosterone and improve erectile function in hypogonadal men with metabolic syndrome. However, larger studies are necessary to strongly prove the effectiveness of low carbohydrate diet in treating male hypogonadism.


Assuntos
Disfunção Erétil , Hipogonadismo , Síndrome Metabólica , Masculino , Humanos , Disfunção Erétil/etiologia , Síndrome Metabólica/complicações , Testosterona , Hipogonadismo/complicações , Dieta com Restrição de Carboidratos
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