4 results on '"Bacteroidetes"'
Search Results
2. Influência da microbiota intestinal na gênese da obesidade: revisão integrativa da literatura
- Author
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Hamid, Amna Muhamad Abder Rauf Muhd Ibrahim, Molz, Patricia, and Franke, Silvia Isabel Rech
- Subjects
Obesity ,Firmicutes ,Bacteroidetes ,Gastrointestinal Microbiome ,Obesidade ,Microbiota intestinal ,Saúde ,Nutrição - Abstract
Introduction: The intestinal microbiota plays a fundamental role in the human immune response and changes in the proportions of the Firmicutes and Bacteroidetes phyla and dietary patterns (diets) may be associated with obesity. Objective: To describe the relationship of the Firmicutes and Bacteroidetes phyla with obesity.Materials and Methods: Survey of pre-clinical and clinical experimental studies, from 2005 to 2020, in the databases: Pubmed and Google academic, using the following search terms: Obesity, Firmicutes, Bacteroidetes and intestinal microbiome, exploring the relationship between obesity and microorganisms, evaluating the following questions: “Are Firmicutes and Bacteroidetes indicators/risk factors for obesity?”; “Does the diet influence the diversity of the intestinal microbiota and body weight?”.Results: Ten articles were analyzed (5 pre-clinical and 5 clinical experimental studies), which showed a correlation between the intestinal microbiota and obesity.Discussion: Pre-clinical experimental studies demonstrate increased proportions of Firmicutes compared to Bacteroidetes in the intestinal microbiota of obese mice (some cases with selected genetics). However, in experimental clinical studies, this evidence is deconstructed by other authors, who still do not clearly establish, which proportions of the Firmicutes and Bacteroidetes phyla are associated with obesity.Conclusion: Only in preclinical models the proportions of Firmicutes/Bacteroidetes are associated with obesity. Introdução: A microbiota intestinal desempenha papel fundamental na resposta imunológica dos seres humanos e mudanças nas proporções dos filos Firmicutes e Bacteroidetes e padrões alimentares (dietas) podem estar associados à obesidade.Objetivo: descrever a influência da microbiota intestinal e sua relação com a obesidade.Materiais e métodos: Levantamento de artigos com experimentação animal e ensaios clínicos, entre os anos 2005 a 2020, nas bases de dados: Pubmed e Google acadêmico, utilizando os seguintes termos de pesquisa: Obesidade, Firmicutes, Bacteroidetes e Microbioma intestinal, explorando a relação entre obesidade e microrganismos, que avaliassem as seguintes questões: “Firmicutes e Bacteroidetes são indicador/fator de risco para obesidade?”; “A dieta influência na diversidade da microbiota intestinal e peso corporal? ”.Resultados: Foram analisados dez artigos que atendiam aos critérios de inclusão e, estes demonstraram evidências e correlação entre a microbiota intestinal e a obesidade.Conclusões: Os estudos experimentais demonstram proporções aumentadas de Firmicutes quando comparada a de Bacteroidetes na microbiota intestinal de camundongos obesos (alguns casos com genética selecionada). No entanto, em estudos de ensaios clínicos, estas evidências são desconstruídas por outros autores, que ainda não estabelecem de forma clara, quais as proporções dos filos Firmicutes e Bacteroidetes estão associadas à obesidade.
- Published
- 2022
3. Effects of anthocyanin on intestinal health: a systematic review
- Author
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Thaísa Agrizzi Verediano, Maria Cristina Dias Paes, Elad Tako, Hércia Stampini Duarte Martino, THAÍSA AGRIZZI VEREDIANO, Universidade Federal de Viçosa, HÉRCIA STAMPINI DUARTE MARTINO, Universidade Federal de Viçosa, MARIA CRISTINA DIAS PAES, CNPMS, and ELAD TAKO, Cornell University.
- Subjects
0301 basic medicine ,Antocianina ,Firmicutes ,Physiology ,Biological Availability ,Polifenóis ,Review ,Gut flora ,Intestinal morphology ,Permeability ,Anthocyanins ,03 medical and health sciences ,chemistry.chemical_compound ,Immune system ,medicine ,microbiota ,Humans ,TX341-641 ,Intestinal Mucosa ,polyphenols ,030109 nutrition & dietetics ,Nutrition and Dietetics ,Intestinal permeability ,biology ,Tight junction ,Microvilli ,Nutrition. Foods and food supply ,Bacteroidetes ,Microbiota ,Barreira intestinal ,biology.organism_classification ,medicine.disease ,Fatty Acids, Volatile ,Gastrointestinal Microbiome ,Saúde intestinal ,Intestines ,intestinal barrier ,030104 developmental biology ,Physical Barrier ,chemistry ,Anthocyanin ,Dietary Supplements ,Goblet Cells ,short chain fatty acids ,Food Science - Abstract
Intestinal health relies on the association between the mucosal immune system, intestinal barrier and gut microbiota. Bioactive components that affect the gut microbiota composition, epithelial physical barrier and intestinal morphology were previously studied. The current systematic review evaluated evidence of anthocyanin effects and the ability to improve gut microbiota composition, their metabolites and parameters of the physical barrier; this was conducted in order to answer the question: ?Does food source or extract of anthocyanin promote changes on intestinal parameters??. The data analysis was conducted following the PRISMA guidelines with the search performed at PubMed, Cochrane and Scopus databases for experimental studies, and the risk of bias was assessed by the SYRCLE tool. Twenty-seven studies performed in animal models were included, and evaluated for limitations in heterogeneity, methodologies, absence of information regarding allocation process and investigators? blinding. The data were analyzed, and the anthocyanin supplementation demonstrated positive effects on intestinal health. The main results identified were an increase of Bacteroidetes and a decrease of Firmicutes, an increase of short chain fatty acids production, a decrease of intestinal pH and intestinal permeability, an increase of the number of goblet cells and tight junction proteins and villi improvement in length or height. Thus, the anthocyanin supplementation has a potential effect to improve the intestinal health. PROSPERO (CRD42020204835). Made available in DSpace on 2021-05-07T13:32:25Z (GMT). No. of bitstreams: 1 Effects-anthocyanin.pdf: 1427598 bytes, checksum: b1756030b31c156b48e1aa40656d0b78 (MD5) Previous issue date: 2021
- Published
- 2021
4. Evaluation of Bacteroidetes dynamics in biodegradation process of polymeric blend Poly (ɛ-caprolactone) / starch / soy protein isolate in different soils
- Author
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Leandro Fonseca de Souza, Claudia Barros Monteiro Vitorello, Pilar Drummond Sampaio Correa Mariani, and Janaina Rigonato
- Subjects
biology ,Bacteroidetes ,biology.organism_classification ,Molecular biology ,Pcr dgge - Abstract
Resíduos produzidos em atividades industriais podem trazer danos significativos ao ambiente, principalmente quando estes não são degradáveis (ou são dificilmente degradáveis) por processos naturais. Polímeros sintéticos estão entre os principais resíduos descartados na natureza, permanecendo inertes por séculos e interferindo em processos ecológicos. Diante deste contexto, explorar o potencial biodegradável de plásticos e uma alternativa na substituição de embalagens descartáveis. Para a construção e otimização de materiais biodegradáveis, faz-se necessária a compreensão da ação da microbiota natural em processos de biodegradação natural. Neste trabalho, buscou-se compreender a dinâmica de microrganismos do filo Bacteroidetes no processo de biodegradação de blenda polimérica Poli (ɛ-caprolactona) / Amido/ Proteína Isolada de Soja (PCL/A/PIS), considerando solos e materiais plásticos distintos, como também a presença de genes notadamente associados a degradação biológica. Para tanto, partindo de amostras de DNA obtidas do solo ao longo do processo de biodegradação, foram utilizadas técnicas de PCR e PCR-DGGE (Reação de Polimerização em Cadeia - Eletroforese em Gel com Gradiente Desnaturante). Observou-se que: Bacteroidetes estão presentes em todos os momentos avaliados do processo de biodegradação da Blenda e do PCL; o solo Arenoso, onde a biodegradação e mais efetiva, apresenta comunidades com perfis bem delimitados, que se diferenciam na degradação da Blenda e do PCL; a dinâmica no solo Argiloso não exibe um padrão claro de influencia dos plásticos sobre a comunidade, apontando, porem para uma convergência de similaridade das comunidades sobre blenda e PCL no momento de maior atividade degradativa. Chitinophagaceae e uma família presente na biodegradação, sendo Chitinophaga pinensis uma das espécies presentes; genes exclusivos a esta espécie e outras da mesma família que codificam lipases e proteases, associados a degradação de polímeros pela literatura cientifica, estão presentes nas amostras de solo avaliadas, sendo possíveis atores na biodegradação dos plásticos. Bacteroidetes aparenta ser um filo importante em processos naturais de biodegradação de polímeros em solos, e explorar o potencial deste grupo e da família Chitinophagaceae pode oferecer subsídios para a construção de plásticos mais eficientes em sua biodegradação. The human productive activity has brought significant damage to the environment, particularly by the disposal of non-degradable waste (or poorly degradable) by natural processes. Synthetic polymers are among the main materials discarded, remaining inert for centuries, causing damage to the natural wildlife or interfering with ecological processes. Given this context, the potential use of biodegradable plastics is an alternative, both for agriculture and for the replacement of disposable packaging. For the construction and optimization of biodegradable materials it is necessary to understand the action of natural microbial communities in the process. Microorganisms have predominant and diversified roles in the biodegradation process, with complex ecological relationships in their responses, either by their phylogenetic relationships or the enzymes used during the process. In this work, we sought to understand the dynamics of Bacteroidetes phylum in the biodegradation process of polymer blend poly (ɛ-caprolactone) / starch / Soy Protein Isolate (PCL/ A/ SPI), considering different soils and plastics, and also the presence of genes associated with biological degradation. Therefore, starting from DNA samples taken from the soil during the biodegradation process, PCR techniques and PCR-DGGE (Polymerization Chain Reaction - Denaturing Gradient Gel Electrophoresis) were used. It was observed that: the Phylum Bacteroidetes is present in all periods evaluated of the biodegradation process of Blend, PCL and even soils without the addition of plastics; the sandy soil, where the biodegradation is more effective, presents communities with well defined profiles that differ in the degradation of blends and PCL; the dynamics in clay soil does not show a clear pattern of plastics influence over the community, pointing to a convergence of communities similarity in blends and PCL over greater degradation activity. Chitinophagaceae is a family present in biodegradation, Chitinophaga pinensis being one of the species present; genes unique to this species and others of the same family encoding lipases and proteases, associated with the degradation of polymers reported in the scientific literature, are present in the evaluated soil samples, potentially acting on plastics biodegradation. Bacteroidetes appears to be an important phylum in natural processes of polymer biodegradation in soils, and to explore the potential of this taxon and of Chitinophagaceae family can shed light on the construction of more efficient biodegradable plastics.
- Published
- 2015
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