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‣ Dietary Polydextrose Prevents Inflammatory Bowel Disease in Trinitrobenzenesulfonic Acid Model of Rat Colitis

Witaicenis, Aline; Fruet, Andrea C.; Salem, Leticia; Di Stasi, Luiz C.
Fonte: Mary Ann Liebert, Inc. Publicador: Mary Ann Liebert, Inc.
Tipo: Artigo de Revista Científica Formato: 1391-1396
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Inflammatory bowel disease (IBD) is a multifactorial intestinal disorder that involves interactions among the immune system, genetic susceptibility, and environmental factors, especially the bacterial flora. Polydextrose, a polysaccharide constituted by 90% nondigestible and nonabsorbable soluble fibers, has several physiological effects consistent with those of dietary fibers, including proliferation of colon microflora. Because sulfasalazine presents serious side effects through long-term use at high doses, the aim of the present study was to evaluate the preventative effect of polydextrose on trinitrobenzenesulfonic acid-induced intestinal inflammation and its effects on the intestinal anti-inflammatory activity of sulfasalazine. Results indicated that polydextrose and its association with sulfasalazine present an anti-inflammatory effect that reduces myeloperoxidase activity, counteracts glutathione content, and promotes reductions in lesion extension and colonic weight/length ratio.

‣ Dietary intervention with green dwarf banana flour (Musa sp AAA) prevents intestinal inflammation in a trinitrobenzenesulfonic acid model of rat colitis

Scarminio, Viviane; Fruet, Andrea C.; Witaicenis, Aline; Rall, Vera L. M.; Di Stasi, Luiz C.
Fonte: Pergamon-Elsevier B.V. Ltd Publicador: Pergamon-Elsevier B.V. Ltd
Tipo: Artigo de Revista Científica Formato: 202-209
Português
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Processo FAPESP: 03/09324-1; Processo FAPESP: 07/54516-7; Dietary products are among the therapeutic approaches used to modify intestinal microflora and to promote protective effects during the intestinal inflammatory process. Because the banana plant is rich in resistant starch, which is used by colonic microbiota for the anaerobic production of the short-chain fatty acids that serve as a major fuel source for colonocytes: first, green dwarf banana flour produces protective effects on the intestinal inflammation acting as a prebiotic and, second, combination of this dietary supplementation with prednisolone presents synergistic effects. For this, we used the trinitrobenzenesulphonic acid (TNBS) model of rat colitis. Our results revealed that the protective effect produced by a combination of 10% green dwarf banana flour with prednisolone was more pronounced than those promoted by a single administration of prednisolone or a diet containing 10% or 20% banana flour. This beneficial effect was associated with an improvement in the colonic oxidative status because the banana flour diet prevented the glutathione depletion and inhibited myeloperoxidase activity and lipid peroxidation. In addition...

‣ Intestinal anti-inflammatory activity of coumarin and 4-hydroxycoumarin in the trinitrobenzenesulphonic acid model of rat colitis

Luchini, Ana Carolina; Rodrigues-Orsi, Patrícia; Cestari, Silvia Helena; Seito, Leonardo Noboru; Witaicenis, Aline; Pellizzon, Claudia Helena; Di Stasi, Luiz Cláudio
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 1343-1350
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Coumarins represent an important class of phenolic compounds with multiple biological activities, including inhibition of lipidic peroxidation and neutrophil-dependent anion superoxide generation, anti-inflammatory and immunosuppressor actions. All of these proprieties are essential for that a drug may be used in the treatment of inflammatory bowel disease. The present study examined intestinal anti-inflammatory activity of coumarin and its derivative, the 4-hydroxycoumarin on experimental ulcerative colitis in rats. This was performed in two different experimental settings, i.e. when the colonic mucosa is intact or when the mucosa is in process of recovery after an initial insult. The results obtained revealed that the coumarin and 4-hydroxycoumarin, at doses of 5 and 25 mg/kg, significantly attenuated the colonic damage induced by trinitrobenzenesulphonic acid (TNBS) in both situations, as evidenced macroscopically, microscopically and biochemically. This effect was related to an improvement in the colonic oxidative status, since coumarin and 4-hydroxycoumarin prevented the glutathione depletion that occurred as a consequence of the colonic inflammation. © 2008 Pharmaceutical Society of Japan.

‣ Anti-inflammatory intestinal activity of Arctium lappa L. (Asteraceae) in TNBS colitis model

De Almeida, Ana Beatriz Albino; Sánchez-Hidalgo, Marina; Martín, Antonio Ramón; Luiz-Ferreira, Anderson; Trigo, José Roberto; Vilegas, Wagner; Dos Santos, Lourdes Campaner; Souza-Brito, Alba Regina Monteiro; De La Lastra, Catalina Alarcón
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 300-310
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Ethnopharmacological relevance: In Brazilian traditional medicine, Arctium lappa (Asteraceae), has been reported to relieve gastrointestinal symptoms. Aim of the study: In the present study, we investigated the effects of the lactone sesquiterpene onopordopicrin enriched fraction (ONP fraction) from Arctium lappa in an experimental colitis model induced by 2,4,6 trinitrobenzene sulfonic acid and performed experiments to elucidate the underlying action mechanisms involved in that effect. Materials and methods: ONP fraction (25 and 50 mg/kg/day) was orally administered 48, 24 and 1 h prior to the induction of colitis and 24 h after. The inflammatory response was assessed by gross appearance, myeloperoxidase (MPO) activity, tumor necrosis factor alpha (TNF-α) levels and a histological study of the lesions. We determined cyclooxygenase (COX)-1 and -2 protein expressions by western blotting and immunohistochemistry assays. Results: TNBS group was characterized by increased colonic wall thickness, edema, diffuse inflammatory cell infiltration, increased MPO activity and TNF-α levels. On the contrary, ONP fraction (25 and 50 mg/kg) treatment significantly reduced the macroscopic inflammation scores (p<0.05 and p<0.01, respectively) and morphological alterations associated with an increase in the mucus secretion. Similarly...

‣ Investigação de dietas ricas em fibras e compostos fitoquimicos na modulação da flora bacteriana e prevenção/tratamento de doenças inflamatorias intestinais; Investigation of diets with high contents of fiber and phytochemical compounds in modulating of bacterial flora and prevention/treatment of inflammation bowel diseases

Cibele Lima de Albuquerque
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 22/01/2010 Português
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Apesar da amplitude de possibilidades terapêuticas, ainda não existe um tratamento ideal para as doenças inflamatórias intestinais (DII), com perfil adequado de eficácia e segurança. Por essa razão, é de grande interesse estudar agentes com pouco efeito colateral, como um nutracêutico, no tratamento/prevenção dessas enfermidades. Neste contexto, surgiu o interesse em se estudar couve e mamão, vegetais com alto teor de carotenóides e fibras dietéticas, além de ter baixo custo e ser de uso comum na dieta de brasileiros. Sabe-se que substâncias antioxidantes e os ácidos graxos de cadeia curta (AGCC), principalmente o ácido butírico, proveniente da fermentação de fibras dietéticas, podem estar envolvidas na prevenção e tratamento de doenças intestinais. O ácido butírico é substrato para a reparação do tecido inflamado e inibe fatores pró-inflamatórios; portanto, quantificar a produção desse ácido é imprescindível, dado que quanto maior for sua produção, maior será a eficiência da dieta para a recuperação do tecido. Para tanto, foi realizada uma análise in vitro que demonstrou que a dose de 0,3 g couve acrescido de 0,2 g de mamão era a dieta que produzia maiores quantidades de butirato, o dado foi obtido através da leitura por cromatografia de íons...

‣ Membrane phospholipid asymmetry in Bacillus amyloliquefaciens.

Paton, J C; May, B K; Elliott, W H
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /08/1978 Português
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The phospholipid distribution in the membrane of Bacillus amyloliquefaciens was studied by using phospholipase C (B. cereus), phospholipase A2 (Crotalus), and the nonpenetrating chemical probe trinitrobenzenesulfonic acid. After treatment of intact protoplasts of B. amyloliquefaciens with either phospholipase, about 70% of total membrane phospholipid was hydrolyzed; specifically, about 90, 90, and 30% of phosphatidylethanolamine, phosphatidylglycerol, and cardiolipin, respectively. Under these conditions, protoplasts remained intact and sealed. However, when protoplasts that were permeabilized by cold-shock treatment were incubated with either of the phospholipases, up to 80% of cardiolipin was hydrolyzed and phosphatidylglycerol and phosphatidylethanolamine were hydrolyzed virtually to completion. In intact cells, 92% of the phosphatidylethanolamine could be labeled with trinitrobenzenesulfonic acid under conditions in which the reagent did not penetrate the membrane to any significant extent. These results indicate that 70% of total phospholipid of this bacillus exists in the outer half of the bilayer. The distribution of phosphatidylethanolamine in this bilayer is highly asymmetric with it being located predominantly in the outer half. The results with phospholipases suggest that the distributions of cardiolipin and phosphatidylglycerol are also asymmetric but independent confirmation of this is required.

‣ Protective effect of ilomastat on trinitrobenzenesulfonic acid-induced ulcerative colitis in rats

Wang, Ying-De; Wang, Wei
Fonte: The WJG Press and Baishideng Publicador: The WJG Press and Baishideng
Tipo: Artigo de Revista Científica
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AIM: To evaluate the protective effects of ilomastat, an exogenous matrix metalloproteinase (MMP) inhibitor, on trinitrobenzenesulfonic acid (TNB)-induced ulcerative colitis (UC) in rats.

‣ Mechanisms of Motility Change on Trinitrobenzenesulfonic Acid-Induced Colonic Inflammation in Mice

Cheon, Gab Jin; Cui, Yuan; Yeon, Dong-Soo; Kwon, Seong-Chun; Park, Byong-Gon
Fonte: The Korean Physiological Society and The Korean Society of Pharmacology Publicador: The Korean Physiological Society and The Korean Society of Pharmacology
Tipo: Artigo de Revista Científica
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Ulcerative colitis is an inflammatory bowel disease (IBD) characterized by recurrent episodes of colonic inflammation and tissue degeneration in human or animal models. The contractile force generated by the smooth muscle is significantly attenuated, resulting in altered motility leading to diarrhea or constipation in IBD. The aim of this study is to clarify the altered contractility of circular and longitudinal smooth muscle layers in proximal colon of trinitrobenzen sulfonic acid (TNBS)-induced colitis mouse. Colitis was induced by direct injection of TNBS (120 mg/kg, 50% ethanol) in proximal colon of ICR mouse using a 30 G needle anesthetized with ketamin (50 mg/kg), whereas animals in the control group were injected of 50% ethanol alone. In TNBS-induced colitis, the wall of the proximal colon is diffusely thickened with loss of haustration, and showed mucosal and mucular edema with inflammatory infiltration. The colonic inflammation is significantly induced the reduction of colonic contractile activity including spontaneous contractile activity, depolarization-induced contractility, and muscarinic acetylcholine receptor-mediated contractile response in circular muscle layer compared to the longitudinal muscle layer. The inward rectification of currents...

‣ Synthesis and evaluation of mutual azo prodrug of 5-aminosalicylic acid linked to 2-phenylbenzoxazole-2-yl-5-acetic acid in ulcerative colitis

Jilani, Jamal A; Shomaf, Maha; Alzoubi, Karem H
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
Publicado em 31/07/2013 Português
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In this study, the syntheses of 4-aminophenylbenzoxazol-2-yl-5-acetic acid, (an analogue of a known nonsteroidal anti-inflammatory drug [NSAID]) and 5-[4-(benzoxazol-2-yl-5-acetic acid)phenylazo]-2-hydroxybenzoic acid (a novel mutual azo prodrug of 5-aminosalicylic acid [5-ASA]) are reported. The structures of the synthesized compounds were confirmed using infrared (IR), hydrogen-1 nuclear magnetic resonance (1H NMR), and mass spectrometry (MS) spectroscopy. Incubation of the azo compound with rat cecal contents demonstrated the susceptibility of the prepared azo prodrug to bacterial azoreductase enzyme. The azo compound and the 4-aminophenylbenzoxazol-2-yl-5-acetic acid were evaluated for inflammatory bowel diseases, in trinitrobenzenesulfonic acid (TNB)-induced colitis in rats. The synthesized diazo compound and the 4-aminophenylbenzoxazol-2-yl-5-acetic acid were found to be as effective as 5-aminosalicylic acid for ulcerative colitis. The results of this work suggest that the 4-aminophenylbenzoxazol-2-yl-5-acetic acid may represent a new lead for treatment of ulcerative colitis.

‣ Allicin Alleviates Inflammation of Trinitrobenzenesulfonic Acid-Induced Rats and Suppresses P38 and JNK Pathways in Caco-2 Cells

Li, Chen; Lun, Weijian; Zhao, Xinmei; Lei, Shan; Guo, Yandong; Ma, Jiayi; Zhi, Fachao
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
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Background. Allicin has anti-inflammatory, antioxidative and proapoptotic properties. Aims. To evaluate the effects and investigate the mechanism of allicin on trinitrobenzenesulfonic acid-induced colitis, specifically with mesalazine or sulfasalazine. Methods. 80 rats were divided equally into 8 groups: control; trinitrobenzenesulfonic acid; allicin prevention; allicin; mesalazine; sulfasalazine; allicin + sulfasalazine, and mesalazine + allicin. Systemic and colonic inflammation parameters were analysed. In addition, protein and culture medium of Caco-2 cells treated with various concentrations of IL-1β or allicin were collected for investigation of IL-8, NF-κB p65 P38, ERK, and JNK. One-way ANOVA and Kruskal-Wallis H test were used for parametric and nonparametric tests, respectively. Results. Allicin reduced the body weight loss of trinitrobenzenesulfonic acid-induced rats, histological score, serum TNF-α and IL-1β levels, and colon IL-1β mRNA level and induced serum IL-4 level, particularly in combination with mesalazine. In addition, 1 ng/mL IL-1β stimulated the P38, ERK, and JNK pathways, whereas pretreatment with allicin depressed this phenomenon, except for the ERK pathway. Conclusions. The inflammation induced by trinitrobenzenesulfonic acid is mitigated significantly by allicin treatment...

‣ Experimental colitis in mice is attenuated by topical administration of chlorogenic acid

Zatorski, Hubert; Sałaga, Maciej; Zielińska, Marta; Piechota-Polańczyk, Aleksandra; Owczarek, Katarzyna; Kordek, Radzisław; Lewandowska, Urszula; Chen, Chunqiu; Fichna, Jakub
Fonte: Springer Berlin Heidelberg Publicador: Springer Berlin Heidelberg
Tipo: Artigo de Revista Científica
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Epidemiological data suggest that the consumption of polyphenol-rich foods reduces the incidence of cancer, coronary heart disease, and inflammation. Chlorogenic acid (CGA), an ester of caffeic and quinic acids, is one of the most abundant polyphenol compounds in human diet with proven biological effectiveness both in vitro and in vivo. The aim of the study is to investigate the possible anti-inflammatory effect of CGA in the gastrointestinal (GI) tract and its mechanism of action. We used a well-established model of colitis, induced by intracolonic (i.c.) administration of trinitrobenzenesulfonic acid (TNBS) in mice. The anti-inflammatory effect of CGA in the colon was evaluated based on the clinical and macroscopic and microscopic parameters. To investigate the mechanism of protective action of CGA, myeloperoxidase (MPO), H2O2, and NF-κB levels were assessed in the colon tissue. CGA administered i.c. at the dose of 20 mg/kg (two times daily) protected against TNBS-induced colitis more effectively than the same dose administered orally (p.o.), as evidenced by significantly lower macroscopic and ulcer scores. Furthermore, CGA (20 mg/kg, i.c.) reduced neutrophil infiltration, as demonstrated by decreased MPO activity. Moreover, CGA suppressed activation of NF-κB...

‣ Severity of mucosal inflammation as a predictor for alterations of visceral sensory function in a rat model

Adam, B.; Liebregts, T.; Gschossmann, J.; Krippner, C.; Scholl, F.; Ruwe, M.; Holtmann, G.
Fonte: Elsevier Science BV Publicador: Elsevier Science BV
Tipo: Artigo de Revista Científica
Publicado em //2006 Português
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Transient inflammation is known to alter visceral sensory function and frequently precede the onset of symptoms in a subgroup of patients with irritable bowel syndrome (IBS). Duration and severity of the initial inflammatory stimulus appear to be risk factors for the manifestation of symptoms. Therefore, we aimed to characterize dose-dependent effects of trinitrobenzenesulfonic acid (TNBS)/ethanol on: (1) colonic mucosa, (2) cytokine release and (3) visceral sensory function in a rat model. Acute inflammation was induced in male Lewis rats by single administration of various doses of TNBS/ethanol (total of 0.8, 0.4 or 0.2 ml) in test animals or saline in controls. Assessment of visceromotor response (VMR) to colorectal distensions, histological evaluation of severity of inflammation, and measurement of pro-inflammatory cytokine levels (IL-2, IL-6) using enzyme-linked immunosorbent assay (ELISA) were performed 2 h and 3, 14, 28, 31 and 42 days after induction. Increased serum IL-2 and IL-6 levels were evident prior to mucosal lesions 2 h after induction of colitis and persist up to 14 days (p < 0.05 vs. saline), although no histological signs of inflammation were detected at 14 days. In the acute phase, VMR was only significantly increased after 0.8 ml and 0.4 ml TNBS/ethanol (p < 0.05 vs. saline). After 28 days...

‣ Post-inflammatory colonic afferent sensitisation: different subtypes, different pathways and different time courses

Hughes, P.; Brierley, S.; Martin, C.; Brookes, S.; Linden, D.; Blackshaw, L.
Fonte: British Med Journal Publ Group Publicador: British Med Journal Publ Group
Tipo: Artigo de Revista Científica
Publicado em //2009 Português
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Objective: Intestinal infection evokes hypersensitivity in a subgroup of patients with irritable bowel syndrome (IBS) long after healing of the initial injury. Trinitrobenzene sulfonic acid (TNBS)-induced colitis in rodents likewise results in delayed maintained hypersensitivity, regarded as a model of some aspects of IBS. The colon and rectum have a complex sensory innervation, comprising five classes of mechanosensitive afferents in the splanchnic and pelvic nerves. Their plasticity may hold the key to underlying mechanisms in IBS. Our aim was therefore to determine the contribution of each afferent class in each pathway towards postinflammatory visceral hypersensitivity. Design: TNBS was administered rectally and mice were studied after 7 (acute) or 28 (recovery) days. In vitro preparations of mouse colorectum with attached pelvic or splanchnic nerves were used to examine the mechanosensitivity of individual colonic afferents. Results: Mild inflammation of the colon was evident acutely which was absent at the recovery stage. TNBS treatment did not alter proportions of the five afferent classes between treatment groups. In pelvic afferents little or no difference in response to mechanical stimuli was apparent in any class between control and acute mice. However...

‣ Membrane phospholipid asymmetry in Bacillus amyloliquefaciens

Paton, J.C.; May, B.K.; Elliott, W.H.
Fonte: American Society for Microbiology Publicador: American Society for Microbiology
Tipo: Artigo de Revista Científica
Publicado em //1978 Português
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The phospholipid distribution in the membrane of Bacillus amyloliquefaciens was studied by using phospholipase C (B. cereus), phospholipase A2 (Crotalus), and the nonpenetrating chemical probe trinitrobenzenesulfonic acid. After treatment of intact protoplasts of B. amyloliquefaciens with either phospholipase, about 70% of total membrane phospholipid was hydrolyzed; specifically, about 90, 90, and 30% of phosphatidylethanolamine, phosphatidylglycerol, and cardiolipin, respectively. Under these conditions, protoplasts remained intact and sealed. However, when protoplasts that were permeabilized by cold-shock treatment were incubated with either of the phospholipases, up to 80% of cardiolipin was hydrolyzed and phosphatidylglycerol and phosphatidylethanolamine were hydrolyzed virtually to completion. In intact cells, 92% of the phosphatidylethanolamine could be labeled with trinitrobenzenesulfonic acid under conditions in which the reagent did not penetrate the membrane to any significant extent. These results indicate that 70% of total phospholipid of this bacillus exists in the outer half of the bilayer. The distribution of phosphatidylethanolamine in this bilayer is highly asymmetric with it being located predominantly in the outer half. The results with phospholipases suggest that the distributions of cardiolipin and phosphatidylglycerol are also asymmetric but independent confirmation of this is required.; J C Paton...

‣ Genomic profile of trinitrobencenesulfonic acid (TNBS)-induced colitis model (GSE9293)

S??nchez de Medina, Ferm??n; Mart??nez-August??n, Olga; Montero Mel??ndez, Trinidad; Su??rez Garc??a, Antonio; Zarzuelo Zurita, Antonio; Su??rez, Mar??a Dolores; Llor, Xavier; Vieites Fern??ndez, Jos?? M.; Gassull, Miguel
Fonte: Universidade de Granada Publicador: Universidade de Granada
Tipo: info:eu-repo/semantics/other; info:eu-repo/semantics/other
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[Organism] Rattus norvegicus; [Experiment type] Expression profiling by array; [Overall design] A single enema of 10mg of TNBS in 50% ethanol was administered to rats at day 0. Samples were recovered at days 2, 5, 7 and 14. According to inflammatory markers (myeloperoxidase activity, body weigh loss, colonic weigh/length ratio) we selected three replicates at each time point for the genimoc analysis, and 6 healthy control rats that received a saline enema. RNA was extracted from homogenized full-thickness colonic tissues in Trizol?? reagent (Invitrogen) and purified with RNeasy affinity columns (Qiagen), according to manufacturer??s protocol. The microarray analysis was performed by Progenika Biopharma (Bilbao, Spain) on GeneChip?? Rat Genome 230 2.0 Array (Affymetrix). All sample labeling (biotin), hybridization, staining and scanning procedures were carried out using Affimetrix, standard protocols (www.affymetrix.com). Normalization was carried out using Bioconductor sofware (affyPLM package).; [Platforms] GPL1355 [Rat230_2] Affymetrix Rat Genome 230 2.0 Array; [Relations] BioProject PRJNA102933; 1. GSM235052 Healthy control, replicate 1. [Characteristics] Sprague-Dawley female rats Tissue: full-thickness colon Rat received water; 2. GSM235053 Healthy control...

‣ The ion channel TRPA1 is required for normal mechanosensation and is modulated by algesic stimuli

Brierley, S.; Hughes, P.; Page, A.; Kwan, K.; Martin, C.; O'Donnell, T.; Isaacs, N.; Harrington, A.; Adam, B.; Liebregts, T.; Holtmann, G.; Corey, D.; Rychkov, G.; Blackshaw, L.
Fonte: W B Saunders Co Publicador: W B Saunders Co
Tipo: Artigo de Revista Científica
Publicado em //2009 Português
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BACKGROUND & AIMS: The transient receptor potential (TRP) channel family includes transducers of mechanical and chemical stimuli for visceral sensory neurons. TRP ankyrin 1 (TRPA1) is implicated in inflammatory pain; it interacts with G-protein-coupled receptors, but little is known about its role in the gastrointestinal (GI) tract. Sensory information from the GI tract is conducted via 5 afferent subtypes along 3 pathways. METHODS: Nodose and dorsal root ganglia whose neurons innnervate 3 different regions of the GI tract were analyzed from wild-type and TRPA1(-/-) mice using quantitative reverse-transcription polymerase chain reaction, retrograde labeling, and in situ hybridization. Distal colon sections were analyzed by immunohistochemistry. In vitro electrophysiology and pharmacology studies were performed, and colorectal distension and visceromotor responses were measured. Colitis was induced by administration of trinitrobenzene sulphonic acid. RESULTS: TRPA1 is required for normal mechano- and chemosensory function in specific subsets of vagal, splanchnic, and pelvic afferents. The behavioral responses to noxious colonic distension were substantially reduced in TRPA1(-/-) mice. TRPA1 agonists caused mechanical hypersensitivity...

‣ Platelet-Derived Growth Factor-BB is the Dominant Mitogen for Intestinal Smooth Muscle Cells in the Trinitrobenzenesulfonic Acid Model of Rat Colitis

Stanzel, ROGER
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
Português
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In normal adult physiology, intestinal smooth muscle cells (ISMC) are characterized as contractile and non-proliferative. Inflammation induces permanent changes to the intestine including hypertrophy of the smooth muscle layer largely due to smooth muscle cell (SMC) proliferation. While the consequences of this hyperplasia are largely unknown, increased muscularis mass may present permanent challenges to organ motility. Similar SMC hyperplasia is observed in other inflammatory pathologies including atherosclerosis and pulmonary arterial hypertension (PAH) where SMC de-differentiate into a ‘synthetic’ phenotype and the mitogens responsible for hyperplasia have been well studied. However, there are limited investigations of SMC mitogens in intestinal inflammation. The identification of these factors may be of critical importance in the case of intestinal strictures, whereby recurring inflammation can lead to bowel obstruction requiring surgical intervention. A novel, primary rat ISMC model was developed to identify the factors responsible for ISMC proliferation in vitro. Primary ISMC cultures are likely more representative of SMC in vivo than the commonly used late-passage cultures. As such, this primary ISMC model is valuable in the evaluation of mitogens involved in the onset of proliferation. This primary ISMC model was used to conduct a comprehensive evaluation of potential mitogens including basic fibroblast growth factor (bFGF)...

‣ Efeitos de antocianinas monoméricas de Sambucus nigra L. sobre modelo de colite ulcerativa induzida por TNBS; Effects of Sambucus nigra L. monomeric anthocyanins on TNBS induced ulcerative colitis

Eduardo Augusto Rabelo Socca
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/01/2011 Português
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Retocolite ulcerativa idiopática e doença de Crohn são doenças inflamatórias intestinais caracterizadas por inflamação crônica da mucosa, resultando em diarréia, fezes sanguinolentas, dores abdominais, anemia, febre, fadiga e perda de peso, tanto em homens quanto em mulheres. Acredita-se que essas manifestações sejam resultado de uma interação multifatorial envolvendo indivíduos geneticamente susceptíveis, condições ambientais específicas, desbalanço na microflora intestinal e desajuste da resposta imune. Drogas derivadas do acido 5-aminossalicilico (sulfassalazina, mesalamina), corticosteroides e agentes imunomoduladores são utilizadas, em conjunto no tratamento dessas patologias. No entanto tais drogas apresentam efeitos adversos importantes, o que acaba por motivar pesquisas envolvendo produtos naturais como alternativas de tratamento. Neste contexto, este trabalho avaliou os efeitos de antocianinas presentes nos frutos de Sambucus nigra L. (sabugueiro), espécie arbustiva pertencente a família Adoxaceae, em modelo de colite ulcerativa induzida pelo acido 2,4,6-trinitrobenzeno sulfônico (TNBS). Os frutos do sabugueiro apresentam grandes concentrações de metabolitos secundários como antocianinas, alem de outros compostos fenólicos...

‣ Actions of Probiotics on Trinitrobenzenesulfonic Acid-Induced Colitis in Rats

Shiina, Takahiko; Shima, Takeshi; Naitou, Kiyotada; Nakamori, Hiroyuki; Sano, Yuuki; Horii, Kazuhiro; Shimakawa, Masaki; Ohno, Hiroshi; Shimizu, Yasutake
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
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We investigated the actions of probiotics, Streptococcus faecalis 129 BIO 3B (SF3B), in a trinitrobenzenesulfonic acid- (TNBS-) induced colitis model in rats. After TNBS was administered into the colons of rats for induction of colitis, the rats were divided into two groups: one group was given a control diet and the other group was given a diet containing SF3B for 14 days. There were no apparent differences in body weight, diarrhea period, macroscopic colitis score, and colonic weight/length ratio between the control group and SF3B group, suggesting that induction of colitis was not prevented by SF3B. Next, we investigated whether SF3B-containing diet intake affects the restoration of enteric neurotransmissions being damaged during induction of colitis by TNBS using isolated colonic preparations. Recovery of the nitrergic component was greater in the SF3B group than in the control group. A compensatory appearance of nontachykininergic and noncholinergic excitatory components was less in the SF3B group than in the control group. In conclusion, the present study suggests that SF3B-containing diet intake can partially prevent disruptions of enteric neurotransmissions induced after onset of TNBS-induced colitis, suggesting that SF3B has therapeutic potential.

‣ NSC127994; Benzenesulfonic acid, 2,4,6-trinitro- (8CI9CI); Picryl sulfonic acid; Trinitrobenzenesulfonic acid; 2,4,6-Dinitrobenzenesulfonate; 2,4,6-Trinitrobenzene-1-sulfonic acid; 2,4, 6-Trinitrobenzenesulfonic acid

US National Cancer Institute
Fonte: Unilever Center for Molecular Informatics, Cambridge University Publicador: Unilever Center for Molecular Informatics, Cambridge University
Tipo: Outros Formato: 3959 bytes; chemical/x-cml
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