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Search Results: 1 - 10 of 12548 matches for " Patrícia Azambuja "
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Trypanosoma rangeli interactions within the vector Rhodnius prolixus: a mini review
Azambuja, Patrícia;Garcia, Eloi S;
Memórias do Instituto Oswaldo Cruz , 2005, DOI: 10.1590/S0074-02762005000500019
Abstract: this article is an integrative mini review of the research on the interactions between trypanosoma rangeli and the insect vector, rhodnius prolixus. special attention is given to the interactions of these parasites with the gut environment, gut walls, with hemolymph invasion, hemocytes, hemocyte microaggregations, prophenoloxidase-activating system, superoxide, and nitric acid generation and eicosanoid pathways. we described factors affecting vectorial capacity and suggested that t. rangeli may modulate the hemocoelic invasion and the survival of the parasites by overcoming the cellular and humoral defense reactions of the insect vector at different physiological events. the mechanisms of these interactions and their significance for parasite transmission are discussed.
Towards an understanding of the interactions of Trypanosoma cruzi and Trypanosoma rangeli within the reduviid insect host Rhodnius prolixus
Azambuja, Patrícia;Ratcliffe, Norman A.;Garcia, Eloi S.;
Anais da Academia Brasileira de Ciências , 2005, DOI: 10.1590/S0001-37652005000300004
Abstract: this review outlines aspects on the developmental stages of trypanosoma cruzi and trypanosoma rangeli in the invertebrate host, rhodnius prolixus. special attention is given to the interactions of these parasites with gut and hemolymph molecules and the effects of the organization of midgut epithelial cells on the parasite development. the vector insect's permissiveness to t. cruzi, which develops in the vector gut, largely depends on the host nutritional state, the parasite strain and the molecular interactions with trypanolytic compounds, lectins and resident bacteria in the gut. t. rangeli invades the hemocoel and once in the hemolymph, can be recognized and activates the defense system of its insect vector, i.e., the prophenoloxidase system, phagocytosis, hemocyte microaggregation, superoxide and nitric oxide activity and the eicosanoid biosynthesis pathway. taken together, these findings not only provide a better understanding of the interactions parasite - insect vector, but also offer new insights into basic physiological processes involved in the parasites transmission.
Towards an understanding of the interactions of Trypanosoma cruzi and Trypanosoma rangeli within the reduviid insect host Rhodnius prolixus
Azambuja Patrícia,Ratcliffe Norman A.,Garcia Eloi S.
Anais da Academia Brasileira de Ciências , 2005,
Abstract: This review outlines aspects on the developmental stages of Trypanosoma cruzi and Trypanosoma rangeli in the invertebrate host, Rhodnius prolixus. Special attention is given to the interactions of these parasites with gut and hemolymph molecules and the effects of the organization of midgut epithelial cells on the parasite development. The vector insect's permissiveness to T. cruzi, which develops in the vector gut, largely depends on the host nutritional state, the parasite strain and the molecular interactions with trypanolytic compounds, lectins and resident bacteria in the gut. T. rangeli invades the hemocoel and once in the hemolymph, can be recognized and activates the defense system of its insect vector, i.e., the prophenoloxidase system, phagocytosis, hemocyte microaggregation, superoxide and nitric oxide activity and the eicosanoid biosynthesis pathway. Taken together, these findings not only provide a better understanding of the interactions parasite - insect vector, but also offer new insights into basic physiological processes involved in the parasites transmission.
Trypanosoma rangeli: a new perspective for studying the modulation of immune reactions of Rhodnius prolixus
Eloi S Garcia, Daniele P Castro, Marcela B Figueiredo, Fernando A Genta, Patrícia Azambuja
Parasites & Vectors , 2009, DOI: 10.1186/1756-3305-2-33
Abstract: Over the last few decades we have observed a dramatic increase in the knowledge of insect innate immunity, which relies on both humoral and cellular responses. However, innate reactions to natural insect pathogens and insect-transmitted pathogens, such as parasites, still remain poorly understood.In this review, we briefly introduce the general immune system of insects and highlight our current knowledge of these reactions focusing on the interactions of Trypanosoma rangeli with Rhodnius prolixus, an important model for innate immunity investigation.There are two types of innate immune reactions: (i) the humoral response that is related to antimicrobial peptides, lectins and the prophenoloxidase (PPO) cascade and (ii) the cellular response which includes phagocytosis, hemocytes aggregation and encapsulation of pathogens.Innate immunity of insects relies on a limited variety of receptors which recognize specific compounds that are on the surface of microorganisms or are released by them. The most well known pathogen-associated molecular patterns (PAMPs) are microbial cell-wall components like lipopolysaccharides (LPS) of Gram-negative bacteria, lipoteichoic acid and peptidoglycans of Gram-positive bacteria, β-1,3 glucans from fungi as well as glycosylphosphatidylinositol (GPI) from protozoan parasites [1,2].The humoral immune system recognizes PAMPs by pattern recognition receptors which are conserved in evolution to bind unique products of microbial metabolism not produced by the host [1,2]. The humoral pattern recognition receptors such as LPS-binding proteins, peptidoglycan recognition proteins (PGRPs), Gram-negative binding proteins (GNBPs), β1,3-glucans recognition protein (βGRP), circulates in the hemolymph of insects [3,4].In the hemocyte surface there are several proteins implicated in the cellular immune response against invading microbes by recognizing the PAMPs. The most well known cellular receptors involved in recognition of pathogens in several insect s
Immune homeostasis to microorganisms in the guts of triatomines (Reduviidae): a review
Garcia, Eloi S;Castro, Daniele P;Figueiredo, Marcela B;Azambuja, Patrícia;
Memórias do Instituto Oswaldo Cruz , 2010, DOI: 10.1590/S0074-02762010000500001
Abstract: bacteria, fungi and parasites are in constant contact with the insect gut environment and can influence different aspects of the host gut physiology. usually, some of these microorganisms develop and survive in the digestive tract. therefore, the gut environment must be able to tolerate certain populations of these organisms for the establishment of interactions between non-pathogenic bacteria, parasites and the gut. this review provides a brief overview of the biological and molecular mechanisms that microorganisms use to interact with the gut epithelia in mosquitoes and speculates on their significances for the development of bacteria and trypanosoma cruzi in the guts of triatomines.
Altera??es biomorfogênicas causadas pela aplica??o de precoceno II em ninfas de Triatoma infestans (Klug, 1834) (Hemiptera, reduviidae, triatominae)
Jurberg, José;Costa, Jane Margaret;Gon?alves, Teresa Cristina M.;Garcia, Eloi;Azambuja, Patrícia de;
Memórias do Instituto Oswaldo Cruz , 1986, DOI: 10.1590/S0074-02761986000200006
Abstract: the morphogenetic effect of precocene ii on 4th instar nymphs of triatoma infestans was examined. topical treatment with precocene ii (200, 300 and 400 μg/nymph) induced the formation of adultoids with the following characteristics; rudimentary wings, three segmented tarsi, ocelli, deformed genitalia and mouth-parts and testes with intermediary development. precocene ii also increases the duration of the molting cycle. the survival of the adultoid insects was related to the inverse of the applied doses. these data extend our knowledge of the action of precocene ii on triatominae species.
Estratégias de atua??o do nutricionista em consultoria alimentar e nutricional da família
Almeida-Bittencourt, Patrícia Afonso de;Ribeiro, Paula Severino Azambuja;Naves, Maria Margareth Veloso;
Revista de Nutri??o , 2009, DOI: 10.1590/S1415-52732009000600013
Abstract: the objective of this work is to present the principles and strategies of a dietitian in food and nutrition consultancy for the family. also known as a personal diet specialist, these dietitians focus mainly on the nutrition education of the family. their practice is based on three fundamental principles: participation of the whole family, promotion of healthy eating habits and optimization of dietary techniques used in the food preparation. to achieve these goals, the dietitian visits families in their households in order to learn about the family's lifestyle and suggests changes in their food habits one at a time. the intervention strategy is personalized and includes, among other things, designs the menu and drafts a groceries shopping list, prescribes an individualized diet and trains the cook. detailed knowledge of the family's food habits, behaviors and lifestyle promotes a personalized intervention. this is vital for the acquisition of healthy eating habits and guarantees greater dietitian's effectiveness in the nutrition and health care of the family.
Trypanosoma cruzi Immune Response Modulation Decreases Microbiota in Rhodnius prolixus Gut and Is Crucial for Parasite Survival and Development
Daniele P. Castro, Caroline S. Moraes, Marcelo S. Gonzalez, Norman A. Ratcliffe, Patrícia Azambuja, Eloi S. Garcia
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0036591
Abstract: Trypanosoma cruzi in order to complete its development in the digestive tract of Rhodnius prolixus needs to overcome the immune reactions and microbiota trypanolytic activity of the gut. We demonstrate that in R. prolixus following infection with epimastigotes of Trypanosoma cruzi clone Dm28c and, in comparison with uninfected control insects, the midgut contained (i) fewer bacteria, (ii) higher parasite numbers, and (iii) reduced nitrite and nitrate production and increased phenoloxidase and antibacterial activities. In addition, in insects pre-treated with antibiotic and then infected with Dm28c, there were also reduced bacteria numbers and a higher parasite load compared with insects solely infected with parasites. Furthermore, and in contrast to insects infected with Dm28c, infection with T. cruzi Y strain resulted in a slight decreased numbers of gut bacteria but not sufficient to mediate a successful parasite infection. We conclude that infection of R. prolixus with the T. cruzi Dm28c clone modifies the host gut immune responses to decrease the microbiota population and these changes are crucial for the parasite development in the insect gut.
Investiga??o da presen?a de efedrinas em Ephedra tweediana Fisch & C.A. Meyer e em E. triandra Tul. (Ephedraceae) coletadas em Porto Alegre/RS
Boff, Bruna de S.;Sebben, Viviane C.;Paliosa, Patrícia K.;Azambuja, Ingrid;Singer, Rodrigo B.;Limberger, Renata P.;
Revista Brasileira de Farmacognosia , 2008, DOI: 10.1590/S0102-695X2008000300014
Abstract: samples of ephedra tweediana, collected from native populations occurring in the reserva biológica do lami josé lutzenberger (porto alegre, rs, brazil), and from cultivated plants of ephedra triandra were submitted to extraction with acetone, derivatized with cyclohexanone and analyzed by gc/ms. in order to verify the efficiency of the methodology, besides ephedra tweediana and e. triandra, samples of five commercial ephedra extracts were analyzed, from distinct origins, get up from local drugstores. the results showed the absence of ephedrines in ephedra tweediana and e. triandra, and the presence of ephedrine and/or pseudoephedrine in commercial samples.
Consumo, digestibilidade aparente dos nutrientes e comportamento ingestivo de bovinos da ra?a Holandesa alimentados com dietas contendo feno de capim-tifton 85 com diversos tamanhos de partícula
Pereira, Elzania Sales;Mizubuti, Ivone Yurika;Ribeiro, Edson Luis de Azambuja;Villarroel, Arturo Bernardo Selaive;Pimentel, Patrícia Guimar?es;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009000100023
Abstract: the intake, the apparent digestibility of nutrients and the ingestion behavior of four holstein steers with average weight of 300 kg and 20 months of age, receiving diets containing tifton 85 hay with different particle sizes (5, 7, 10 mm and whole) were evaluated. a 4 × 4 latin square experimental design with four steers and four periods was used. intakes of dry matter, organic matter, crude protein, ether extract, neutral detergent fiber, acid detergent fiber, total carbohydrates and non-structural carbohydrates were not influenced by the different granulometric profiles of the experimental diets. the dm digestibility were different between diets with particles size of 7 and 10 mm (67.31 and 54.95%, respectively). however, these diets were similar to that with 5 mm of particle size and whole hay, which showed intermediate values, with mean of 63.62%. the total feeding time of the animals that received diets with particles size of 7, 10 mm and whole did not differ. the tifton 85 hay with different particles size did not affect the intake, digestibility of nutrients and the ingestion behavior of holstein steers fed total mixed ration.
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