LPS-induced IL-8 activation in human intestinal epithelial cells is accompanied by specific histone H3 acetylation and methylation changes

<p>Abstract</p> <p>Background</p> <p>The release of LPS by bacteria stimulates both immune and specific epithelial cell types to release inflammatory mediators. It is known that LPS induces the release of IL-8 by intestinal mucosal cells. Because it is now emerging that bacteria may induce alteration of epigenetic patterns in host cells, we have investigated whether LPS-induced IL-8 activation in human intestinal epithelial cells involves changes of histone modifications and/or DNA methylation at IL-8 gene regulatory region.</p> <p>Results</p> <p>RT-PCR analysis showed that IL-8 mRNA levels rapidly increase after exposure of HT-29 cells to LPS. DNA demethylating agents had no effects on IL-8 expression, suggesting that DNA methylation was not involved in IL-8 gene regulation. Consistently we found that 5 CpG sites located around IL-8 transcription start site (-83, -7, +73, +119, +191) were unmethylated on both lower and upper strand either in LPS treated or in untreated HT-29 cells, as well as in normal intestinal mucosa.</p> <p>Conversely, pretreatment of HT-29 cells with deacetylase inhibitors strengthened the LPS-mediated IL-8 activation. Inhibitors of histone deacetylases could induce IL-8 mRNA expression also in the absence of LPS, suggesting that chromatin modifications could be involved in IL-8 gene regulation. Chromatin immunoprecipitation analyses showed that, concurrently with IL-8 activation, transient specific changes in H3 acetylation and H3K4, H3K9 and H3K27 methylation occurred at IL-8 gene promoter during LPS stimulation. Changes of H3-acetyl, H3K4me2 and H3K9me2 levels occurred early, transiently and corresponded to transcriptional activity, while changes of H3K27me3 levels at IL-8 gene occurred later and were long lasting.</p> <p>Conclusion</p> <p>The results showed that specific chromatin modifications occurring at IL-8 gene, including histone H3 acetylation and methylation, mark LPS-mediated IL-8 activation in intestinal epithelial cells while it is unlikely that DNA methylation of IL-8 promoter is directly involved in IL-8 gene regulation in these cells.</p

Chromatin and DNA methylation dynamics during retinoic acid-induced RET gene transcriptional activation in neuroblastoma cells.

Although it is well known that RET gene is strongly activated by retinoic acid (RA) in neuroblastoma cells, the mechanisms underlying such activation are still poorly understood. Here we show that a complex series of molecular events, that include modifications of both chromatin and DNA methylation state, accompany RA-mediated RET activation. Our results indicate that the primary epigenetic determinants of RA-induced RET activation differ between enhancer and promoter regions. At promoter region, the main mark of RET activation was the increase of H3K4me3 levels while no significant changes of the methylation state of H3K27 and H3K9 were observed. At RET enhancer region a bipartite chromatin domain was detected in unstimulated cells and a prompt demethylation of H3K27me3 marked RET gene activation upon RA exposure. Moreover, ChIP experiments demonstrated that EZH2 and MeCP2 repressor complexes were associated to the heavily methylated enhancer region in the absence of RA while both complexes were displaced during RA stimulation. Finally, our data show that a demethylation of a specific CpG site at the enhancer region could favor the displacement of MeCP2 from the heavily methylated RET enhancer region providing a novel potential mechanism for transcriptional regulation of methylated RA-regulated loci

Nachrichten aus der Bruder-Gemeine, 1842, no. 02

The Moravian Church's monthly journal of its worldwide activities, including in Labrador, published from 1819-94

Isogeometric analysis for fluid shear stress in cancer cells

Este trabalho foi financiado pelo Concurso Anual para Projetos de Investigação, Desenvolvimento, Inovação e Criação Artística (IDI&CA) 2018 do Instituto Politécnico de Lisboa. Código de referência IPL/2018/IGACFC_ISELThe microenvironment of the tumor is a key factor regulating tumor cell invasion and metastasis. The effects of physical factors in tumorigenesis is unclear. Shear stress, induced by liquid flow, plays a key role in proliferation, apoptosis, invasion, and metastasis of tumor cells. The mathematical models have the potential to elucidate the metastatic behavior of the cells’ membrane exposed to these microenvironment forces. Due to the shape configuration of the cancer cells, Non-uniform Rational B-splines (NURBS) lines are very adequate to define its geometric model. The Isogeometric Analysis allows a simplified transition of exact CAD models into the analysis avoiding the geometrical discontinuities of the traditional Galerkin traditional techniques. In this work, we use an isogeometric analysis to model the fluid-generated forces that tumor cells are exposed to in the vascular and tumor microenvironments, in the metastatic process. Using information provided by experimental tests in vitro, we present a suite of numerical experiments which indicate, for standard configurations, the metastatic behavior of cells exposed to such forces. The focus of this paper is strictly on geometrical sensitivities to the shear stress’ exhibition for the cell membrane, this being its innovation.info:eu-repo/semantics/publishedVersio

Guidelines for the management and treatment of periodic fever syndromes Cryopyrin-associated periodic syndromes (cryopyrinopathies – CAPS)

AbstractObjectiveTo establish guidelines based on cientific evidences for the management of cryopyrin associated periodic syndromes.Description of the evidence collection methodThe Guideline was prepared from 4 clinical questions that were structured through PICO (Patient, Intervention or indicator, Comparison and Outcome), to search in key primary scientific information databases. After defining the potential studies to support the recommendations, these were graduated considering their strength of evidence and grade of recommendation.Results1215 articles were retrieved and evaluated by title and abstract; from these, 42 articles were selected to support the recommendations.Recommendations1. The diagnosis of CAPS is based on clinical history and clinical manifestations, and later confirmed by genetic study. CAPS may manifest itself in three phenotypes: FCAS (mild form), MWS (intermediate form) and CINCA (severe form). Neurological, ophthalmic, otorhinolaryngological and radiological assessments may be highly valuable in distinguishing between syndromes; 2. The genetic diagnosis with NLRP3 gene analysis must be conducted in suspected cases of CAPS, i.e., individuals presenting before 20 years of age, recurrent episodes of inflammation expressed by a mild fever and urticaria; 3. Laboratory abnormalities include leukocytosis and elevated serum levels of inflammatory proteins; and 4. Targeted therapies directed against interleukin-1 lead to rapid remission of symptoms in most patients. However, there are important limitations on the long-term safety. None of the three anti-IL-1β inhibitors prevents progression of bone lesions

Profile of paediatric rheumatology specialists and services in the state of São Paulo

INTRODUCTION: Paediatric rheumatology (PR) is an emerging specialty, practised by a limited number of specialists. Currently, there is neither a record of the profile of rheumatology patients being treated in Brazil nor data on the training of qualified rheumatology professionals in the country. OBJECTIVE: To investigate the profile of PR specialists and services, as well as the characteristics of paediatric patients with rheumatic diseases, for estimating the current state of rheumatology in the state of São Paulo. PATIENTS AND METHODS: In 2010, the scientific department of PR of the Paediatric Society of São Paulo administered a questionnaire that was answered by 24/31 accredited specialists in PR practising in state of São Paulo and by 8/21 institutions that provide PR care. RESULTS: Most (91%) of the surveyed professionals practise in public institutions. Private clinics (28.6%) and public institutions (37.5%) reported not having access to nailfold capillaroscopy, and 50% of the private clinics reported not having access to acupuncture. The average duration of professional practise in PR was 9.4 years, and 67% of the physicians had attended postgraduate programmes. Seven (87.5%) public institutions perform teaching activities, in which new paediatric rheumatologists are trained, and five (62.5%) offer postgraduate programmes. Two-thirds of the surveyed specialists use immunosuppressants and biological agents classified as restricted use by the Health Secretariat. The disease most frequently reported was juvenile idiopathic arthritis (29.1-34.5%), followed by juvenile systemic lupus erythematosus (JSLE) (11.6-12.3%) and rheumatic fever (9.1-15.9%). The incidence of vasculitis (including Henoch-Schönlein purpura, Wegener's granulomatosis, and Takayasu's arteritis) and autoinflammatory syndromes was higher in public institutions compared to other institutions (P = 0.03, P = 0.04, P = 0.002, and P < 0.0001, respectively). Patients with JSLE had the highest mortality rate (68% of deaths), mainly due to infection. CONCLUSION: The field of PR in the state of São Paulo has a significant number of specialists with postgraduate degrees who mostly practise at teaching institutions with infrastructures appropriate for the care of high-complexity patients.INTRODUÇÃO: A reumatologia pediátrica (RP) é uma especialidade emergente, com número restrito de especialistas, e ainda não conta com uma casuística brasileira sobre o perfil dos pacientes atendidos e as informações sobre a formação de profissionais capacitados. OBJETIVO: Estudar o perfil dos especialistas e dos serviços em RP e as características dos pacientes com doenças reumáticas nessa faixa etária a fim de estimar a situação atual no estado de São Paulo (ESP). PACIENTES E MÉTODOS: No ano de 2010 o departamento científico de RP da Sociedade de Pediatria de São Paulo encaminhou um questionário respondido por 24/31 especialistas com título de especialização em RP que atuam no ESP e por 8/12 instituições com atendimento nesta especialidade. RESULTADOS: A maioria (91%) dos profissionais exerce suas atividades em instituições públicas. Clínicas privadas (28,6%) e instituições (37,5%) relataram não ter acesso ao exame de capilaroscopia e 50% das clínicas privadas não tem acesso à acupuntura. A média de tempo de prática profissional na especialidade foi de 9,4 anos, sendo 67% deles pós-graduados. Sete (87,5%) instituições públicas atuam na área de ensino, formando novos reumatologistas pediátricos. Cinco (62,5%) delas têm pós-graduação. Dois terços dos especialistas utilizam imunossupressores e agentes biológicos de uso restrito pela Secretaria da Saúde. A doença mais atendida foi artrite idiopática juvenil (29,1%-34,5%), seguida de lúpus eritematoso sistêmico juvenil (LESJ) (11,6%-12,3%) e febre reumática (9,1%-15,9%). Vasculites (púrpura de Henoch Schönlein, Wegener, Takayasu) e síndromes autoinflamatórias foram mais incidentes nas instituições públicas (P = 0,03; P = 0,04; P = 0,002 e P < 0,0001, respectivamente). O LESJ foi a doença com maior mortalidade (68% dos óbitos), principalmente por infecção. CONCLUSÃO: A RP no ESP conta com um número expressivo de especialistas pós-graduados, que atuam especialmente em instituições de ensino, com infraestrutura adequada ao atendimento de pacientes de alta complexidade.34635

Association between rheumatic fever and Takayasu’s arteritis – Case report

ABSTRACT Takayasu’s arteritis (TA) and rheumatic fever are diseases that can start with cardiac fea-tures, making the diagnosis difficult. There are reports of association of RF with Takayasu’sarteritis beginning with cardiac involvement in pediatric patients. The aim of this study isto report the possible association of RF and TA in patients with cardiac abnormalities. Wedescribe the case of an adolescent initially diagnosed with RF who progressed with changesthat allowed making the diagnosis of TA. TA and RF are two important causes of valveinvolvement that may have systemic manifestations

Features of 847 childhood-onset systemic lupus erythematosus patients in three age groups at diagnosis: a brazilian multicenter study

To evaluate demographic data and clinical and laboratory features at disease diagnosis in 3 different age groups of childhood-onset systemic lupus erythematosus (SLE): group A, early-onset (0.05). However, the frequency of fever (78% versus 61% versus 47%; P2 kg (19% versus 28% versus 36%; P=0.017), photosensitivity (34% versus 41% versus 51%; P=0.006), leukopenia <4,000/mm(3) (14% versus 25% versus 30%; P=0.048), and lymphopenia <1,500/mm(3) (22% versus 41% versus 47%; P=0.011) was significantly lower in group A. Our large multicenter study identified the finding that the initial appearance of childhood-onset SLE is characterized by comparable high frequency of internal organ involvement and some distinct clinical and laboratory features in early-onset and adolescent groups681117361741CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ305068/2014-8; 301805/2013-0; 303422/2015-7-1AFederico Foundation; Nucleo de Apoio a Pesquisa Saude da Crianca e do Adolescente da USP (grant NAP-CriAd

Comprometimento da habilidade verbal no lúpus eritematoso sistêmico juvenil Verbal ability impairment in juvenil e systemic lupus erythematosus

INTRODUÇÃO/OBJETIVO: Avaliar a frequência do comprometimento da habilidade verbal e possíveis fatores associados em pacientes portadores de Lúpus Eritematoso Sistêmico Juvenil (LESJ). PACIENTES E MÉTODOS: Estudo transversal de 36 crianças e adolescentes com LESJ, de um grupo de 57 pacientes, do Ambulatório de Reumatologia do Departamento de Pediatria e Clínica Médica da Santa Casa de Misericórdia de São Paulo. Por ocasião do diagnóstico e do estudo, foram analisados aspectos epidemiológicos, clínicos, socioeconômicos e de escolaridade. Os pacientes foram submetidos a testes cognitivos e exames laboratoriais, e foram avaliadas medidas de atividade da doença (SLEDAI) e do dano cumulativo (SLICC-DI) e o tratamento com corticoesteroide. Os pacientes foram submetidos a testes cognitivos (escalas Weschler de inteligência: WISC III e WAISS III), e os resultados foram avaliados de acordo com os aspectos epidemiológicos, clínicos, laboratoriais e terapêuticos. RESULTADOS: A média de idade ao diagnóstico foi de 11,2 ± 2 anos, a idade na época do estudo de 15,4 ± 4,7 anos, com 89% do sexo feminino. Houve predomínio de pacientes da classe socioeconômica C (61,1%). O comprometimento cognitivo detectado nesses pacientes foi frequente (58,3%), sendo o comprometimento da habilidade verbal um dos domínios cognitivos mais constantes. Encontrou-se associação do comprometimento da habilidade verbal com baixa condição socioeconômica e dano cumulativo (P < 0,05), mas não com atividade da doença, presença de autoanticorpos e dose de corticoesteroide (P > 0,05). CONCLUSÕES: Alteração da habilidade verbal é frequente no LESJ e está associada à condição socioeconômica e ao dano cumulativo, devendo ser suspeitada e investigada, principalmente por se tratar de pacientes pediátricos, para que não haja comprometimento da qualidade de vida na fase adulta. Como não está relacionado à atividade da doença ou à presença de autoanticorpos, deve ser sempre avaliado na presença ou não desses fatores. Da mesma forma, deve-se avaliar independentemente das doses de corticoesteroide por não haver associação.<br>INTRODUCTION/OBJECTIVE: Evaluate the frequency of verbal ability impairment and associated factors in patients with juvenile systemic lupus erythematosus (JSLE). PATIENTS AND METHODS: Cross sectional study of 36 children and adolescents with JSLE of a group of 57 patients at the Clinic of Rheumatology, Department of Pediatrics and Medical Clinic of Santa Casa de Misericórdia de São Paulo. At the time of diagnosis and study, we analyzed the following epidemiological features: clinical, socioeconomic, and educational level. Patients underwent cognitive and laboratory tests and we assessed disease activity (SLEDAI), cumulative damage (SLICC-DI), and treatment with corticosteroids. The patients underwent cognitive tests (Wechsler Intelligence Scales: WISC III and Waiss III), and the results were evaluated according to epidemiological, clinical, laboratory and treatment features. RESULTS: The mean age at diagnosis was 11.2 ± 2 years and at the time of the study the mean age was 15.4 ± 4.7 years. There was predominance of women (89%) and of socioeconomic class C patients (61.1%). The cognitive impairment found in these patients was frequent (58.3%), affecting more often the verbal ability. We found association of verbal ability impairment with low socioeconomic status and cumulative damage (P < 0.05), but not with disease activity, presence of autoantibodies, and dose of corticosteroids (P > 0.05). CONCLUSIONS: Change in verbal ability is frequent in JSLE and is associated with socioeconomic status and cumulative damage, and should be suspected and investigated, particularly in pediatric patients to avoid quality of life impairment in adulthood. As it is not related with disease activity or presence of autoantibodies, it should always be assessed in the presence or absence of these factors. Likewise, the doses of corticosteroids should be independently evaluated