39 research outputs found
Matrix metalloproteinase gene polymorphisms and oral cancer
Since oral squamous cell carcinoma (OSCC) is the most prevalent malignant cancer in the oral cavity, several
researches have been performed to study the role of important enzymes in this disease. Among them, the matrix
metalloproteinases (MMPs) are highlighted, due to the fact that they are proteinases responsible to degrade
many extra-cellular matrix components, making possible the invasion of neoplasic cells. Important tools in cancer
prognosis have been utilized aiming to correlate high levels of MMPs and OSCC, such as immunohistochemical,
zymographic and mRNA detection methods. However, these techniques are usually applied after cancer detection,
characterizing a curative but not a preventive medicine. Trying to make interventions before the development of
the disease and making possible the identification of people at high risk and, analysis of modifications in MMP
genes has been a chance for modern medicine. Recently, polymorphisms in MMP genes have been related to different
neoplasias, including OSCC. Despite investigation is beginning, MMP gene polymorphisms seems to have a
promising future in oral cancer research and some of the present results have shown that there are MMP polymorphisms
related to an increased risk for developing oral cancer
Intraosseous foreign-body granuloma in the mandible subsequent to a 20-year-old work-related accident
The purpose of this article was to describe the clinical and microscopic features of an intraosseous foreign-body granuloma in the mandible that developed after the traumatic implantation of metal fragments during a work-related accident. A 65-year-old male patient had a severe pain in the body of mandible. Clinical examination showed facial asymmetry and a scar, extending to the left mental region. Intraoral examination revealed a soft mass involving the left alveolar bone with normal appearance of the mucosa surface. Panoramic radiographs showed a radiolucent lesion along the mandible extending from the central incisive to the first molar. Computed tomography revealed an osteolytic mass in the same area. His medical history included a work-related accident twenty years prior to evaluation. During the biopsy an important amount of bright metal-like pieces surrounded by soft tissue were found. A microscopic examination showed a foreign body associated with an aggregation of multinucleated giant cells. The final diagnosis was a foreign body granuloma. Even though foreign-body granulomas in the mandible are rare lesions, dentists should be familiar with their features and include them in the differential diagnosis of tissue masses
Intraosseous foreign-body granuloma in the mandible subsequent to a 20-year-old work-related accident
Abstract The purpose of this article was to describe the clinical and microscopic features of an intraosseous foreign-body granuloma in the mandible that developed after the traumatic implantation of metal fragments during a work-related accident. A 65-year-old male patient had a severe pain in the body of mandible. Clinical examination showed facial asymmetry and a scar, extending to the left mental region. Intraoral examination revealed a soft mass involving the left alveolar bone with normal appearance of the mucosa surface. Panoramic radiographs showed a radiolucent lesion along the mandible extending from the central incisive to the first molar. Computed tomography revealed an osteolytic mass in the same area. His medical history included a work-related accident twenty years prior to evaluation. During the biopsy an important amount of bright metal-like pieces surrounded by soft tissue were found. A microscopic examination showed a foreign body associated with an aggregation of multinucleated giant cells. The final diagnosis was a foreign body granuloma. Even though foreign-body granulomas in the mandible are rare lesions, dentists should be familiar with their features and include them in the differential diagnosis of tissue masses
VASCULARIZAÇÃO E GRAU DE ATIPIA EPITELIAL EM LESÕES PRÉ-NEOPLÁSICAS QUIMICAMENTE INDUZIDAS / VASCULARIZATION AND EPITHELIAL DYSPLASIA IN CHEMICALLY INDUCED PRENEOPLASTIC LESIONS
Introdução: A angiogênese é um importante fator nos processos neoplásicos, entretanto, seu papel no desenvolvimento de lesões pré-neoplásicas ainda é fonte de estudos. Objetivo: Avaliar a relação entre o número de espaços vasculares e o grau de atipia epitelial em lesões pré-neoplasicas induzidas na pele de camundongos hairless. Métodos: Foram utilizados 34 animais, sendo vinte do grupo de estudo (grupo A) e quatorze do grupo controle (grupo B). No grupo A foi pincelado DMBA a 0,5% no dorso dos animais durante 12 semanas (grupo A1; n=10) e 24 semanas (grupo A2; n=10). O grupo controle recebeu a aplicação de acetona por 12 (B1; n=7) e 24 semanas (B2; n=7), e ao final dos períodos, realizou-se a biópsia da pele para análise histopatológica. Nas lâminas histológicas foram avaliadas a atipia epitelial e o número dos espaços vasculares. Os dados foram submetidos à análise de variância e ao teste de Tukey (5%). Resultados: A análise revelou que 80% do grupo A1 e 100% do A2 apresentaram gradação intensa de atipia celular e aumento no número de vasos neoformados, quando comparados ao grupo B. Conclusão: No modelo estudado, a vascularização foi relacionada ao grau de atipia epitelial nas lesões pré-neoplásicas.Palavras-chave: Angiogênese patológica. Gradação neoplásica. 9,10-dimetil-1,2-benzantraceno.AbstractIntroduction: The angiogenesis is an important factor in neoplastic process; however, its role in preneoplastic lesions is still in investigation. Objective: to evaluate if there is a relationship between the number of vascular spaces and the degree of epithelial atypia in preneoplastic lesions induced by DMBA in hairless mice skin. Methods: Thirty-four animals were divided into an experimental group (group A=20 mice) and control group (group B= 14 mice). The group A animals received 0.5% DMBA in the skin during 12 weeks (group A1; n=10) and 24 weeks (group A2; n=10). The control group received the acetone application during 12 (B1; n=7) and 24 weeks (B2; n=7). At the end of these periods, the skin lesion was biopsied for histopathology analysis. The histological slides were evaluated according to the epithelial atypia and the number of vascular spaces. The data were submitted to analysis of variance (ANOVA) and Tukey test (
Ventilação mecânica não-invasiva aplicada em pacientes com insuficiência respiratória aguda após extubação traqueal
Rising rural body-mass index is the main driver of the global obesity epidemic in adults
Body-mass index (BMI) has increased steadily in most countries in parallel with a rise in the proportion of the population who live in cities(.)(1,2) This has led to a widely reported view that urbanization is one of the most important drivers of the global rise in obesity(3-6). Here we use 2,009 population-based studies, with measurements of height and weight in more than 112 million adults, to report national, regional and global trends in mean BMI segregated by place of residence (a rural or urban area) from 1985 to 2017. We show that, contrary to the dominant paradigm, more than 55% of the global rise in mean BMI from 1985 to 2017-and more than 80% in some low- and middle-income regions-was due to increases in BMI in rural areas. This large contribution stems from the fact that, with the exception of women in sub-Saharan Africa, BMI is increasing at the same rate or faster in rural areas than in cities in low- and middle-income regions. These trends have in turn resulted in a closing-and in some countries reversal-of the gap in BMI between urban and rural areas in low- and middle-income countries, especially for women. In high-income and industrialized countries, we noted a persistently higher rural BMI, especially for women. There is an urgent need for an integrated approach to rural nutrition that enhances financial and physical access to healthy foods, to avoid replacing the rural undernutrition disadvantage in poor countries with a more general malnutrition disadvantage that entails excessive consumption of low-quality calories.Peer reviewe
Height and body-mass index trajectories of school-aged children and adolescents from 1985 to 2019 in 200 countries and territories: a pooled analysis of 2181 population-based studies with 65 million participants
Summary Background Comparable global data on health and nutrition of school-aged children and adolescents are scarce. We aimed to estimate age trajectories and time trends in mean height and mean body-mass index (BMI), which measures weight gain beyond what is expected from height gain, for school-aged children and adolescents. Methods For this pooled analysis, we used a database of cardiometabolic risk factors collated by the Non-Communicable Disease Risk Factor Collaboration. We applied a Bayesian hierarchical model to estimate trends from 1985 to 2019 in mean height and mean BMI in 1-year age groups for ages 5–19 years. The model allowed for non-linear changes over time in mean height and mean BMI and for non-linear changes with age of children and adolescents, including periods of rapid growth during adolescence. Findings We pooled data from 2181 population-based studies, with measurements of height and weight in 65 million participants in 200 countries and territories. In 2019, we estimated a difference of 20 cm or higher in mean height of 19-year-old adolescents between countries with the tallest populations (the Netherlands, Montenegro, Estonia, and Bosnia and Herzegovina for boys; and the Netherlands, Montenegro, Denmark, and Iceland for girls) and those with the shortest populations (Timor-Leste, Laos, Solomon Islands, and Papua New Guinea for boys; and Guatemala, Bangladesh, Nepal, and Timor-Leste for girls). In the same year, the difference between the highest mean BMI (in Pacific island countries, Kuwait, Bahrain, The Bahamas, Chile, the USA, and New Zealand for both boys and girls and in South Africa for girls) and lowest mean BMI (in India, Bangladesh, Timor-Leste, Ethiopia, and Chad for boys and girls; and in Japan and Romania for girls) was approximately 9–10 kg/m2. In some countries, children aged 5 years started with healthier height or BMI than the global median and, in some cases, as healthy as the best performing countries, but they became progressively less healthy compared with their comparators as they grew older by not growing as tall (eg, boys in Austria and Barbados, and girls in Belgium and Puerto Rico) or gaining too much weight for their height (eg, girls and boys in Kuwait, Bahrain, Fiji, Jamaica, and Mexico; and girls in South Africa and New Zealand). In other countries, growing children overtook the height of their comparators (eg, Latvia, Czech Republic, Morocco, and Iran) or curbed their weight gain (eg, Italy, France, and Croatia) in late childhood and adolescence. When changes in both height and BMI were considered, girls in South Korea, Vietnam, Saudi Arabia, Turkey, and some central Asian countries (eg, Armenia and Azerbaijan), and boys in central and western Europe (eg, Portugal, Denmark, Poland, and Montenegro) had the healthiest changes in anthropometric status over the past 3·5 decades because, compared with children and adolescents in other countries, they had a much larger gain in height than they did in BMI. The unhealthiest changes—gaining too little height, too much weight for their height compared with children in other countries, or both—occurred in many countries in sub-Saharan Africa, New Zealand, and the USA for boys and girls; in Malaysia and some Pacific island nations for boys; and in Mexico for girls. Interpretation The height and BMI trajectories over age and time of school-aged children and adolescents are highly variable across countries, which indicates heterogeneous nutritional quality and lifelong health advantages and risks
Heterogeneous contributions of change in population distribution of body mass index to change in obesity and underweight NCD Risk Factor Collaboration (NCD-RisC)
From 1985 to 2016, the prevalence of underweight decreased, and that of obesity and severe obesity increased, in most regions, with significant variation in the magnitude of these changes across regions. We investigated how much change in mean body mass index (BMI) explains changes in the prevalence of underweight, obesity, and severe obesity in different regions using data from 2896 population-based studies with 187 million participants. Changes in the prevalence of underweight and total obesity, and to a lesser extent severe obesity, are largely driven by shifts in the distribution of BMI, with smaller contributions from changes in the shape of the distribution. In East and Southeast Asia and sub-Saharan Africa, the underweight tail of the BMI distribution was left behind as the distribution shifted. There is a need for policies that address all forms of malnutrition by making healthy foods accessible and affordable, while restricting unhealthy foods through fiscal and regulatory restrictions